Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Population Dynamics" wg kryterium: Temat


Wyświetlanie 1-75 z 75
Tytuł:
Bayesian birds: concerning the paper of R. F. Green
Autorzy:
Kimmel, Marek
Powiązania:
https://bibliotekanauki.pl/articles/747375.pdf
Data publikacji:
1983
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Ecology, Population dynamics
Opis:
Artykuł nie zawiera streszczenia
The article contains no abstract
Źródło:
Mathematica Applicanda; 1983, 11, 22
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Von Bertalanffys growth dynamics with strong Allee effect
Autorzy:
Rocha, J.
Aleixo, Sandra
Powiązania:
https://bibliotekanauki.pl/articles/729888.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
Von Bertalanffy's model
population dynamics
Allee effect
Opis:
Von Bertalanffy's model is one of the most popular differential equation used in order to study the increase in average length or weight of fish. However, this model does not include demographic Allee effect. This phenomenon is known in the fisheries literature as "depensation", which arises when populations decline rapidly at low densities. In this paper we develop and investigate new corrected von Bertalanffy's models with Allee effects. The generalization that we propose results from considering correction factors, one of rational type and the others of polynomial type, where two parameters are considered. The use of a parameter C > 0 leads the presented generalization, which yields some more flexible models with variable extinction rates. An Allee limit or unstable equilibrium $E^u$ is incorporated so that the models under study have strong Allee effect. We analyze and show the transition from the strong Allee effect to the inexistence of this effect, through by a "weakening" of the Allee effect, depending on the parameters C and $E^u$. Finally, we discuss the flexibility of corrected von Bertalanffy's sigmoid growth curves. So, the correspondents inflexion points are variable, i.e., the fish mass when the growth rate is maximum may be varied.
Źródło:
Discussiones Mathematicae Probability and Statistics; 2012, 32, 1-2; 35-45
1509-9423
Pojawia się w:
Discussiones Mathematicae Probability and Statistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DŁUGOTERMINOWE REGIONALNE KONSEKWENCJE MIGRACJI W EUROPIE - METODA OCENY I WYBRANE WYNIKI
LONG-TERM REGIONAL CONSEQUENCES OF MIGRATION IN EUROPE - ASSESSMENT METHOD AND SELECTED RESULTS
Autorzy:
Kupiszewski, Marek
Kupiszewska, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/579499.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MIGRATION
EUROPE
POPULATION
MODELLING
POPULATION AGING
LABOUR FORCE
POPULATION DYNAMICS
Opis:
The paper presents a method of assessment of the long-term impact of migration on the development of population and labour force in 287 regions of Europe in 31 countries. The first stage of the study was to prepare population projections in several variants. An important issue was to address the problem of the availability and quality of data on international migration. The measurement of the impact of migration on total population and labour force was conducted by comparing the percentage changes in population and labour force obtained in various simulations. The impact on the age structure was examined by analyzing demographic and labour force dependency ratios. A method of comparing the impact of various components of population change: natural change and different categories of migration flows (extra-European migration, international migration within Europe and internal migration) was proposed. In the second part of the paper, selected results of the simulations, showing potential long-term consequences of the observed migration flows, were presented. Special attention was paid to the regional differences in the consequences.
Źródło:
Studia Migracyjne - Przegląd Polonijny; 2012, 38, 2(144); 105-134
2081-4488
2544-4972
Pojawia się w:
Studia Migracyjne - Przegląd Polonijny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematics Serve to Orchestrate the Progression of Studies In Biological Sciences: Overview on Occasion of April, the Mathematics Awareness Month
Autorzy:
Khyade, Vitthalrao B.
Wanve, Hanumant V.
Powiązania:
https://bibliotekanauki.pl/articles/1177867.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Biomathematics
Quantitative Genetics; Population Dynamics; Supercomplex Mechanisms
Opis:
The mathematics and biology are the interdisciplinary approaches in the field of scientific research. Both, mathematics and biology deserve a wide range of applications. Mathematical biology or biomathematics is the study of mathematics for biology. One can derive the quantitative genetics through consideration of infinitesimal effects at a large number of gene loci, together with the assumption of linkage equilibrium or quasi-linkage equilibrium. Ronald Fisher made the intensive work on fundamental advances in statistics (Example: Analysis of Variance). This achievement by Ronald Fisher was through his work on quantitative genetics. The phylogenetics is one more important branch of population genetics that led to the extensive development of Biological sciences through Mathematics. The Phylogenetics is the branch dealing with the reconstruction and analysis of phylogenetic (evolutionary) trees and network based on inherited characteristics. Assumptions on the “Constant Population Size” belongs to many “Population Genetics” models. The population dynamics is treating the “Variable Population Size” as absence of genetic variation. History of such type of work goes back to the 19th century. Even as far as 1798. In 1798, Thomas Malthus formulated the first principle of population dynamics. This principle later became popularize as the “Malthusian Growth Model”. Alfred J. Lotka, in 1910 proposed the model of autocatalytic chemical reactions. Vito Volterra tried his best to extend this work and titled as “Lotka - Volterra Predator-Prey Equations”. Basically, Vito Volterra was Mathematician. The mathematical epidemiology is the study of infectious disease affecting populations. Upto some extent, the “Population dynamics” use to overlaps mathematical epidemiology. The mathematics and Biology, both are serving a lot to orchestrate the progression of the global research.
Źródło:
World Scientific News; 2018, 98; 140-149
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insights on Short-term Blooms of Planktonic Ciliates, Provided by an Easily Recognised Genus: Cyrtostrombidium
Autorzy:
Bulit, Celia
Macek, Miroslav
Montagnes, David J. S.
Powiązania:
https://bibliotekanauki.pl/articles/763531.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Bloom, conjugation, parasitism, patch, population dynamics, lagoon
Opis:
Planktonic ciliates occasionally form brief rapid increases in numbers (blooms) that can be trophically important. Although model simulations and mesocosm studies indicate that blooms occur over 10 to 20 days, field data are rarely suffi ciently detailed to reveal their occurrence and demise. Our data (collected over 57 weeks across a coastal lagoon) offer insights into the population dynamics of a single species, place these in the context of the entire ciliate assemblage, and provide guidance on what should continue to be examined. Specifically, to evaluate population dynamics we examine two species of Cyrtostrombidium, characterise temporal and spatial variation of their abundance, and relate these to abiotic phenomena and biological factors. This is also the first report of Cyrtostrombidium in a tropical coastal lagoon. Collectively our analysis reveals key aspects of the dynamics of this genus: 1) small-scale peaks in abundance are ~30 m in size and can persist for ~10–30 days, reaching a maximum of 100 cells ml–1; 2) these increases are driven by biotic factors (revealed through autocorrelation analysis); 3) long-term trends are driven by the shift between dry and rainy seasons and by the periods of isolation of lagoon from the sea (revealed through multiple regression analysis); 4) blooms may at times control primary production; 5) conjugation, an ecologically important event, may be associated with blooms (at times 9% of population was conjugating); and 6) dinoflagellate parasitism, poorly described in oligotrichs, is potentially important in population demise. These results both reflect on how ciliates may behave in short-term events and should encourage the continued need for detailed observations of field samples at a high taxonomic resolution.
Źródło:
Acta Protozoologica; 2013, 52, 1
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania nad liczebnością wyspowej populacji nornicy rudej (Clethrionomys glareolus, Schreber 1780) i ich znaczenie dla teorii
The population dynamics of bank voles (Clethrionomys glareolus, Schreber 1780) and its significance for theory
Autorzy:
Bujalska, Gabriela
Powiązania:
https://bibliotekanauki.pl/articles/1817871.pdf
Data publikacji:
2003-12-31
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
Clethrionomys glareolus
nornica ruda
liczebność populacji
population dynamics
Opis:
This is an overview of long-term studies (1966-1997) on the bank vole - Clethrionomys glareolus (Photo 1). population inhabiting Crabapple Island in NE Poland. The history of recognition of causes affecting population dynamics as well as variable interpretation of the facts comprising the theory of functional relations in that population is described. Meandering ideas can be illustrated by Fig. 1. The population dynamics (each year data on population numbers in April, July, and October are shown) is presented in Fig. 2. The evidence is provided that the population exhibits a weak 3.8 year and a much more clear 9.4-year cycle (Fig. 3). The number of sexually mature females, that is those able to reproduce, has been relatively stable and independent of the population size or of the immature female numbers (Fig. 4). The reason is the territoriality of mature females: the female territory (part of the female home range) cannot be visited by other mature females. A tendency toward territoriality was also noted among mature males, which numbers were limited by the availability of mature females, and therefore also relatively stable. Such a social system can be considered gynocentric.
Źródło:
Studia Ecologiae et Bioethicae; 2003, 1, 1; 429-444
1733-1218
Pojawia się w:
Studia Ecologiae et Bioethicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field and Laboratory Studies of the Earthworm Dendrobaena Alpina
Autorzy:
Kostecka, J.
Butt, K. R.
Powiązania:
https://bibliotekanauki.pl/articles/124743.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
earthworms
Dendrobaena alpina
field study
laboratory culture
population dynamics
Opis:
Distribution of Dendrobaena alpina covers the mountainous region of central Europe, where it has a high dominance and frequency index. This work describes data from field studies conducted over two annual cycles in the Bieszczady National Park (BNP), Poland, in different types of beech forest. Densities of this species ranged from 47–231 g·m -2 with associated biomasses of 19–90 g·m -2. Most (66%) were recovered from less than 0.1 m soil depth with a further 28% from up to 0.2 m. Further, the animals were collected alive from Lutowiska, close to the BNP to obtain baseline data on the life history of D. alpina. Mature individuals were kept in isolation and cocoon production monitored on a 2 monthly basis. Immature individuals were kept until they reached maturity, when they were paired, with combined output of cocoons regularly monitored. Cocoons were collected, had their masses determined and were incubated. Hatchability was recorded, as was estimated duration of incubation and growth to maturity. Field-collected adults had a mean mass of 1.4 g and at 15 ºC, these produced an average of 1.83 cocoons·worm -1·month -1. Zero cocoons were produced by further specimens, collected as immature, grown to maturity and maintained in isolation. Recently-matured, paired D. alpina produced an average of 1.65 cocoons·worm -1·month -3. Cocoons had a mean mass of 19 mg. At 15 ºC, cocoons produced by recently matured adults hatched after 80 days (82% viable), but after 2 months the majority of cocoons failed to hatch. Hatchling growth from an average of 18 mg to maturity required 7–11 months in the given substrate.
Źródło:
Journal of Ecological Engineering; 2015, 16, 5; 213-217
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the aquatic moss Sphagnum denticulatum Brid. population abundance in a softwater lake over a period of three years
Autorzy:
Szmeja, J
Powiązania:
https://bibliotekanauki.pl/articles/57078.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
aquatic moss
population dynamics
Sphagnum denticulatum
population abundance
soft water lake
lake
phenology
Opis:
Changes in population abundance of submerged Sphagnum denticulatum Brid. were studied in an acidic and oligotrophic lake in NW Poland over three years. Individuals were counted in a moss carpet at a depth of 2.5 m on 4 experimental plots, 1 × 1 m each, every 30 days for 36 months using the SCUBA method. PAR intensity was seasonally variable (in winter higher than in summer). Changes in water pH, conductivity, HCO3- concentration, hydration and sediment pH were statistically insignificant (p > 0.05). In the summer of the second study year the moss carpet disappeared almost completely due to a massive bloom of filamentous green algae. Periods of growth, regression and regeneration were observed in the population. The stabilisation of population size took 24 months and followed the pattern: slight fluctuations, then rapid growth and repetition of slight fluctuations. The first stage lasted nine, the second four and the third nine months. These stages took place irrespective of seasons, temperature or PAR intensity. Each rapid increase in abundance lasted about 30 days, at PAR intensity >20% and water temperature ranging from 11 to 16oC (in winter, spring or autumn). The regression stage brought about by the algal bloom started in the second year (in summer) and lasted six months (until the end of January in the third year). The population regeneration began in winter (in February, water temperature 3.0oC, PAR about 20%, ice cover 0.15 m) and finished with the end of spring. The population of S. denticulatum shows a repetitive pattern of abundance variations, which is seriously disturbed in summer, especially after a warm spring, by a massive bloom of filamentous green algae.
Źródło:
Acta Societatis Botanicorum Poloniae; 2010, 79, 2; 167-173
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of a two sex population with gestation period
Autorzy:
Busoni, Giorgio
Palczewski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1208215.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
differential equations with delay
stationary solutions
population dynamics
mathematical modelling
Opis:
We investigate a mathematical model of population dynamics for a population of two sexes (male and female) in which new individuals are conceived in a process of mating between individuals of opposed sexes and their appearance is postponed by a period of gestation. The model is a system of two partial differential equations with delay which are additionally coupled by mathematically complicated boundary conditions. We show that this model has a global solution. We also analyze stationary ('permanent') solutions and show that such solutions exist if the model parameters satisfy two nonlinear relations.
Źródło:
Applicationes Mathematicae; 2000, 27, 1; 21-34
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Labor force dynamics and economic performance: A case of Nigeria, India, and China
Autorzy:
Omolola Oyedepo, Elizabeth
Powiązania:
https://bibliotekanauki.pl/articles/32443882.pdf
Data publikacji:
2024
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
labor force
economic performance
demographic change
population dynamics
ARDL model
Opis:
Aim/purpose – This study investigated the nexus between labor force dynamics and economic performance in Nigeria, India, and China. Design/methodology/approach – The study used annual time series data spanning from 1991 to 2021 obtained from World Development Indicators (WDI). After the unit root stationarity test, the Autoregressive Distributed Lag Model (ARDL) was used for the analysis. Findings – Findings from the study support a positive short-run relationship between labor force participation and economic growth in all three countries. However, in China, population growth impacts the economy positively in the long run, while life expectancy at birth negatively impacts the economy in the short run. This is because China’s population is aging. In India, employment in the industrial and service sectors positively impacts the economy in the long run. In the short run, life expectancy at birth influences the economy negatively. Furthermore, in Nigeria, the industrial and service sector employment impact the economy negatively in the long run, though there are positive effects in the short run. Research implications – The Indian government needs policy reforms in the areas of education and health to take advantage of the potential of its youthful population. The Nigerian government requires implementing a wide range of education, investment, and employment-generating policies to foster tangible economic growth. These reforms could help both India and Nigeria take advantage of the potential for demographic change. The Chinese government, already having policy reforms in place, is geared towards improved fertility and population growth for economic growth in the near future. These policies, coupled with the study’s findings, could provide a more comprehensive understanding of the implications of demographic change on economic performance. Originality/value contribution – This analysis explored and compared the demographic potentials of two young countries (India and Nigeria) and an aging, wealthy economy (China) from the working class. Policy lessons for the attainment of demographic dividends are borrowed from China.
Źródło:
Journal of Economics and Management; 2024, 46; 143-170
1732-1948
Pojawia się w:
Journal of Economics and Management
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Storage of hydrogenous gas in geological formations: self-organisation methane gas
Autorzy:
Toleukhanov, A.
Kaltayev, A.
Panfilov, M.
Powiązania:
https://bibliotekanauki.pl/articles/298661.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
porous media
hydrogen
reactive transport
bacteria
neuston
chemotaxis
population dynamics
oscillations
Opis:
In the case of producing large amounts of hydrogenous gas, currently there are no problems related to basic techniques of hydrogen production and distribution, but the main technological problem will consists of storing it in order to regulate the difference between permanent or increasing gas production and seasonally modulated gas consumption. The most efficient and most inexpensive method of storing large amounts of hydrogen is to inject them in geological formations like aquifers, depleted gas reservoirs, or salt caverns (Zittel and Wurster 1996). The cost is of order $ 3.5 per 1 GJ (Taylor et al. 1986). Several underground storages of hydrogen (USH) or town gas exist in the word, as for instance, Teeside in the UK, in Texas, in Russia, Kiel in Germany, Lobodice in Czechoslovakia, Beynes - an ex-storage in France. During several tens of years the storage of hydrogen was considered as something deja-vu, to be similar to that of natural gas, which is amplified by the chemical inactivity of hydrogen and its very low solvability in groundwater [Bulatov 1979; Carden and Paterson 1979; Lindblom 1985; Paterson 1983]. Nevertheless, quite unusual behaviour of UHS was discovered by in situ monitoring of the gas composition extracted during the cycle "production" which followed the cycle "injection". These observations (Smigai et al. 1990; Buzek et al. 1994) revealed high variations of gas composition in time and space. In particular, a significant reduction in the H2 and CO2 contents and a simultaneous increase in CH4 contents were observed in the Lobodice town gas storage facility (Smigai et al. 1990). Similar phenomena were recorded in Beynes. After several months of injection and storage, at the beginning of the cycle "production" the twofold increase of the methane contents in the reservoir gas and the twofold reduction of the CO2 CO contents was observed. The contents of hydrogen decreased by 1.4. The explanation to these observations has been done in (Buzek et al. 1994) in terms of the in situ methane generators by methanogenic bacteria which catalyse the reaction between hydrogen and CO2/CO, by producing methane and water. Further observations have revealed even more unusual effects within the storage facility, such as creating a spatial alternation of the areas saturated preferably by hydrogen or methane. This proved an in situ natural separation of chemical components in space. Thus, we are dealing with a natural reactor which partially destroys CO2 and H2 and doubles the mass of methane. It is clear that the problem is important for industry as it concerns both the energy sector and ecology. The resulting economical efficiency of such a process can be estimated only after the physical and mathematical modeling of all possible scenarios of the reservoir behaviour. The development of such a model represents the main objective of this paper.
Źródło:
AGH Drilling, Oil, Gas; 2013, 30, 1; 241-245
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The dynamics of the population of a steppe perennial Senecio macrophyllus M.BIEB. during xerothermic grassland overgrowing
Autorzy:
Czarnecka, B
Powiązania:
https://bibliotekanauki.pl/articles/56894.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
population dynamics
steppe plant
Senecio macrophyllus
xerothermic grassland
life-stage structure
Opis:
The study aimed to determine the long-term changes of the Senecio macrophyllus M.BIEB. population traits: the abundance, reproduction mode, individual fecundity, seed rain and recruitment of new genets in the course of xerothermic grassland overgrowing. The study had also the applied goal: to estimate the chances of "special care" species to survive in the changing environment without management regime for the maintenance of grassland. The model object was the island population of large-leaved ragwort on Biała Góra (the White Mountain) near Tomaszów Lubelski, South-East Poland. To achieve these aims I used the following sets of data: phytosociological relev,s made in plant communities in an interval of 16-18 years; repeated elaboration of the numbers and life-stage structure of the population, both by non-surface and surface method; observation of plants, life cycle in 50 labelled genets; population reproduction and seed rain amounts. The area of an open xerothermic grassland decreased due to the process of overgrowing by bushes which was accompanied by the increasing coverage of forest and meadow herbs as well as monocotyledons, mainly Brachypodium pinnatum and Calamagrostis epigejos. The abundance of the S. macrophyllus population noticable diminished. The flowering mode has been changing during years from an oscillation to a chaotic type which caused the significant decreasing of the individual fecundity, population reproduction and seed rain. In last years it was reflected in the interruption of juveniles’ recruitment.
Źródło:
Acta Societatis Botanicorum Poloniae; 2009, 78, 3; 247-256
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predators and prey
Autorzy:
Bartoszyński, Robert
Powiązania:
https://bibliotekanauki.pl/articles/748789.pdf
Data publikacji:
1979
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
branching processes (Galton-Watson, birth-and-death, etc.)
Population dynamics, epidemiology
Opis:
MR0549988
This article presents the basic conclusions contained in the English-language papers by the author [Math. Biosci. 33 (1977), no. 1–2, 135–144; MR0682243] and by the author and W. J. Bühler [ibid. 38 (1978), no. 3–4, 293–301; MR0479452] on the probability of extinction of the prey in a bivariate Markov chain model (Xk,Yk) for the number of prey Xk and number of predators Yk at time kT, k≥0, imbedded in a complex continuous-time process.
Źródło:
Mathematica Applicanda; 1979, 7, 15
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bark beetles in the Tatra Mountains. International research 1998-2005 - an overview
Autorzy:
Grodzki, W.
Turcani, M.
Jakus, R.
Hlasny, T.
Rasi, R.
McManus, M.L.
Powiązania:
https://bibliotekanauki.pl/articles/38438.pdf
Data publikacji:
2010
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
bark beetle
beetle
Tatras Mountains
Picea abies
population dynamics
Polska
Slovakia
Opis:
This paper is a review of fundamental information on bark beetles and their interactions with several predisposing factors (air pollution, drought/temperature interactions, windthrows, management activities) that are thought to contribute to the outbreaks in the High Tatra Mountains. The findings of many research projects indicate that the impact of air pollution on bark beetle populations is indirect and complex and that the disturbances in the physiology and natural resistance of trees may be of crucial importance to bark beetle population dynamics. An active forest protection approach is needed to be applied to the secondary Norway spruce forests affected in the past by human activity. Bark beetle populations in natural and near-natural forests (mainly in the upper montane zone) are regulated by natural mechanisms; bark beetles are therefore a natural factor contributing to forest development, including the transition of future generations of spruce.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2010, 52, 2
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the complex of phyllophagous Lepidoptera (Insecta) in deciduous trees of Kharkiv citi for 50 years
Zmiany w kompleksie motyli filofagicznych (Insecta, Lepidoptera) drzew liściastych w Charkowie na przestrzeni 50 lat
Autorzy:
Kardash, E.
Powiązania:
https://bibliotekanauki.pl/articles/2053030.pdf
Data publikacji:
2020
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
Lepidoptera
urban deciduous trees
lifestyle
size rank
type of population dynamics
Opis:
The aim of this work is to compare the species composition of phyllophagous Lepidoptera in deciduous trees of Kharkiv city as of the 1960s and 2017-2020, as well as the distribution of insect species by lifestyle, by the size of individuals, and by the ability to mass propagation. The greatest increase in the number of genera and species was noted in the families Gracillariidae, Tortricidae, and Geometridae, and a decrease in the families Notodontidae and Erebidae. Gracillariidae has been replenished due to 4 alien species: Cameraria ohridella, Macrosaccus robiniella, Parectopa robiniella, and Phyllonorycter issikii. Open-living species predominate in both assessments, however, at the second assessment, the number of species with semi-hidden and hidden lifestyles increased as well as the number of middle-size and small-size species. The eruptive species from the fi rst assessment became rarer, and alien species more often.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2020, 24; 27-39
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global existence and asymptotic behavior for a nonlinear degenerate SIS model
Autorzy:
Ziane, T. A.
Powiązania:
https://bibliotekanauki.pl/articles/952842.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
reaction diffusion systems
degenerate diffusion
global existence
asymptotic behavior
population dynamics
Opis:
In this paper we investigate the global existence and asymptotic behavior of a reaction diffusion system with degenerate diffusion arising in the modeling and the spatial spread of an epidemic disease.
Źródło:
Opuscula Mathematica; 2013, 33, 4; 615-630
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvability and Asymptotic Behavior of a Population Problem Taking into Account Random Mating and Females Pregnancy
Autorzy:
Skakauskas, V.
Powiązania:
https://bibliotekanauki.pl/articles/929725.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika populacji
migracja
population dynamics
random mating
gestation of females
migration
Opis:
Two deterministic age-sex-structured population dynamics models are discussed taking into account random mating of sexes (without formation of permanent male-female couples), possible destruction of the fetus (abortion), and female's pregnancy. One of them deals with both random and directed diffusion in the whole space while in the other the population is assumed to be nondispersing. The population consists of three components: one maleand two female, the latter two being the single (nonfertilized) female and the fertilized one. The case of a separable solution of the limited nondispersing population (in which death moduli can be decomposed into the sum of two terms where one of them depends on time and age and theother is a function of time and the population size) is analyzed. The existence of a unique solution of the Cauchy problem for the nondispersing population model is proved and its longtime behavior is demonstrated. An analogous situation for the dispersing population is analyzed, too.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 1; 37-61
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Population changes and characteristics of demographic processes in Tbilisi
Zmiany liczby ludności i charakter procesów demograficznych w Tbilisi
Autorzy:
Meladze, Giorgi
Loladze, Nika
Powiązania:
https://bibliotekanauki.pl/articles/691729.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
płodność
migracje
prognoza
dynamika liczby ludności
fertility
migration
Tbilisi
prognosis
population dynamics
Opis:
Na początku lat 90. XX wieku w Gruzji miało miejsce natychmiastowe zakończenie wieloletnich stosunków gospodarczych ze Związkiem Radzieckim. Dodatkowo konflikty zbrojne w Abchazji i Osetii Północnej doprowadziły do kryzysu społeczno-gospodarczego i politycznego w Gruzji. Wszystkie te wydarzenia miały ogromny wpływ na procesy demograficzne w Tbilisi. Niniejszy artykuł ma na celu ukazanie głównych czynników społeczno-ekonomicznych i kulturowych dotyczących zmian demograficznych i procesów demograficznych w postsowieckiej Tbilisi. Dodatkowo autorzy przedstawili prognozy zmian liczby ludności w latach 2015–2030.
At the beginning of the 1990s, as a result of the dissolution of the Soviet Union, an instant termination of economic relations that had existed for dozens of years took place in Georgia. Along with the armed conflicts in the regions of Tskhinvali and Abkhazia it has led to a full-fledged socio-economic and political crisis in Georgia. These unordinary events have had a great influence on the demographic processes at hand in Tbilisi. This article aims to establish the effects of the main socio-economic and cultural factors on population change and demographic processes in post-Soviet Tbilisi and offers prognosis on population change according to low, medium and high estimates for 2015–2030.
Źródło:
Space – Society – Economy; 2017, 19; 87-103
1733-3180
2451-3547
Pojawia się w:
Space – Society – Economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The population dynamics of aphids Cinara juniperi De Geer on the shrubs of Juniperus communis L. in urban conditions of Lublin
Dynamika populacji mszyc Cinara juniperi De Geer na krzewach Juniperus communis L. w warunkach miejskich Lublina
Autorzy:
Jaśkiewicz, B.
Kot, I.
Powiązania:
https://bibliotekanauki.pl/articles/11541670.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
population dynamics
shrub
urban condition
Juniperus communis
Cinara juniperi
Lublin city
aphid
Opis:
Studies on the population dynamics of aphids Cinara juniperi De Geer on the shrubs of Juniperus communis L. in the urban conditions of Lublin were conducted in the years 2002–2004 in two types of sites: a street one and a park one. The first individuals of this species were most frequently observed at the turn of April and May, while the maximum population was found in the first half of May. The course of the weather conditions affected the population dynamics of aphids. Those insects were observed in much bigger numbers on the shrubs growing in the street site. The preying of C. juniperi caused browning and drying out of the needles and inhibition of the stem growth, which had an influence on lower decorative character of the examined plants.
Badania nad dynamiką populacji mszyc Cinara juniperi De Geer na krzewach Juniperus communis L. w warunkach miejskich Lublina prowadzono w latach 2002–2004 na dwóch typach stanowisk: przyulicznym i parkowym. Pierwsze osobniki tego gatunku najczęściej notowano na przełomie kwietnia i maja, a maksimum populacji w pierwszej połowie maja. Na dynamikę populacji mszyc miał wpływ przebieg warunków pogodowych. Owady te znacznie liczniej obserwowano na krzewach rosnących na stanowisku przyulicznym. Żerowanie miodownicy jałowcowej powodowało brązowienie i usychanie igieł oraz zahamowanie wzrostu pędów, co miało wpływ na obniżenie dekoracyjności badanych roślin.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2007, 06, 4; 3-10
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Data Analysis and Presentation for Population Dynamics of Cotugnia sp. Parasitizing Domestic Fowl
Autorzy:
Jadhav, A. N.
Bhure, D. B.
Nanware, S. S.
Powiązania:
https://bibliotekanauki.pl/articles/1186744.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Computer aided Techniques
Cotugnia
Domestic Fowl
Gallus gallus domesticus
Nanded
Population Dynamics
Opis:
Goal of this paper is to present the techniques of Data Analysis and Presentation for population dynamics of Cestode parasite Cotugnia sp. parasitizing domestic fowl Gallus gallus domesticus from different localities of Nanded District (M.S.) India during October, 2014 to September, 2015. High incidence, density and index of infection were reported in Summer followed by Winter whereas infection was low in monsoon.
Źródło:
World Scientific News; 2016, 32; 24-35
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spirostomum teres: A Long Term Study of an Anoxic-Hypolimnion Population Feeding upon Photosynthesizing Microorganisms
Autorzy:
Macek, Miroslav
Sánchez Medina, Ximena
Picazo, Antonio
Peštová, Dana
Bautista Reyes, Fernando
Montiel Hernández, Jorge Ricardo
Alcocer, Javier
Merino Ibarra, Martín
Camacho, Antonio
Powiązania:
https://bibliotekanauki.pl/articles/52089923.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Spirostomum teres
ciliate
population dynamics
maar lake
anoxic hypolimnion
picocyanobacteria
feeding rate
Opis:
The pelagic / anoxic hypolimnion population of Spirostomum teres was investigated as a part of the long-term ciliates’ monitoring (2003–2016) in an oligo- to mesotrophic monomictic hyposaline crater lake Alchichica (Puebla / Veracruz, Mexico), including an analysis of picoplankton (both heterotrophic, HPP and autotrophic, APP) and inorganic compounds of nitrogen (ammonium, nitrite, nitrate), phosphorus (dissolved reactive phosphorus, DRP) and silicon. Additionally, detailed studies of the ciliate vertical distribution and feeding activity measured upon fluorescently labelled APP (picocyanobacteria) were carried out. The results were compared with those from a neighbour freshwater crater lake La Preciosa and with a meromictic karstic lake La Cruz (Cuenca, Spain). The ciliate vertical distribution within the water column was very well defined: During the first decade, the benthic population was frequently found throughout a developing stratification of the lake. The established stratification of the lake turned the conditions favourable for the formation of an oxycline / hypolimnion population, typically, several meters below the deep chlorophyll maximum (formed basically by diatoms); the population preferred the layers without detectable dissolved oxygen. However, an observed gradient of light (PAR) could support both oxygenic and anoxygenic photosynthesis. Late stratification after deepening of the thermocline reduced the layers with S. teres population to a minimum apparently due to the drastic change in physicochemical conditions within a metalimnion, coupled with an oxycline, and limited to 1 to 2 meters; microstratification was found. Last years, the very bottom population disappeared or it was reduced and the late stratification S. teres peaks were smaller or did not appeared. Generally, S. teres oxycline / anoxic hypolimnion population was observed from June through November. Optimum picoplankton numbers in conditions that supported the ciliate growth were found: The ciliate was peaking at APP of 0.6 to 1 × 105 cells mL–1; the optimum of HPP was observed round 1.4 × 106 cells mL–1. S. teres was efficiently feeding upon picocyanobacteria in numbers of 105 cells mL–1 reaching the clearance rate of 2000 nL cell–1h–1, which represented in average 130 to 210 cells cell–1h–1 ingested. Feeding upon purple sulphur bacteria was observed but only during the end of the lake stable stratification when the ciliate population was already dropping. On the other hand, the volume specific clearance of S. teres upon picocyanobacteria (103 h–1) did not support the hypothesis that they could serve as a sole prey. Feeding upon eukaryote phytoplankton (chlorophytes Monoraphidium minutum, diatoms Cyclotella choc tawhatcheeana) could be of higher importance that previously supposed. Additionally, a use of ingested and retained photosynthetic prokaryotes is hypothesized.
Źródło:
Acta Protozoologica; 2020, 59, 1; 13-38
0065-1583
1689-0027
Pojawia się w:
Acta Protozoologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameterisation of a population model for Acartia spp. in the Southern Baltic Sea. Part 1. Development time
Autorzy:
Dzierzbicka-Glowacka, L.
Lemieszek, A.
Zmijewska, M.I.
Powiązania:
https://bibliotekanauki.pl/articles/49034.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
population dynamics
environment condition
Baltic Sea
development
Acartia bifilosa
Acartia
growth
Gdansk Gulf
population model
Opis:
The copepod model (see Dzierzbicka-Głowacka 2005b),red uced to a zero-dimensional population model (Fennel 2001,S tegert et al. 2007),i s calibrated for Acartia spp. under the environmental conditions typical of the southern Baltic Sea. Most of the coefficients used in the model are taken from the literature,co ntaining values from various published studies and parameters derived for similar species. The parameters for growth are presented in Part 1; those for population dynamics are given in Part 2. Ingestion rates,whic h are dependent on developmental stage, food supply,temp erature and weight of the animals, are estimated for Acartia bifilosa at 15◦C from the Gdańsk Deep after the experimental data of Ciszewski & Witek (1977). In Part 1 the model presents the change in mean individual mass in successive stages. Quantitative formulae are obtained describing the effects of temperature and food concentration on the development time of Acartia spp. for each of the model stage groups. The generation time during the seasons in the upper layer of the Gdańsk Deep is also determined. The simulations computed here are similar to the experimental results. Part 2 (Dzierzbicka-Głowacka et al. 2009 – this issue) will evaluate egg production as a function of the above-mentioned parameters,temp erature and food availability.
Źródło:
Oceanologia; 2009, 51, 2; 165-184
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial and age-dependent population dynamics model with an additional structure: can there be a unique solution?
Autorzy:
Tchuenche, Jean M.
Powiązania:
https://bibliotekanauki.pl/articles/972264.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Variational inequalities
population dynamics
age structure
physiological variable
Ostrogradski or Green’s formula
Opis:
A simple age-dependent population dynamics model with an additional structure or physiological variable is presented in its variational formulation. Although the model is well-posed, the closed form solution with space variable is difficult to obtain explicitly, we prove the uniqueness of its solutions using the fundamental Green’s formula. The space variable is taken into account in the extended model with the assumption that the coefficient of diffusivity is unity.
Źródło:
Acta Universitatis Lodziensis. Folia Mathematica; 2013, 18; 33-45
2450-7652
Pojawia się w:
Acta Universitatis Lodziensis. Folia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The annual population dynamics of gastrointestinal nematodes in breeding sheep of the Silesian Foothills, southern Poland
Autorzy:
Balicka-Ramisz, A.
Ramisz, G.
Zychlinska-Buczek, J.
Powiązania:
https://bibliotekanauki.pl/articles/6280.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
population dynamics
gastrointestinal nematode
nematode
parasite
prevalence
breeding animal
sheep
Silesian Foothill
Polska
Źródło:
Annals of Parasitology; 2013, 59, 4
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controllability of a class of infinite dimensional systems with age structure
Autorzy:
Maity, Debayan
Tucsnak, Marius
Zuazua, Enrique
Powiązania:
https://bibliotekanauki.pl/articles/1839149.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
infinite dimensional linear system
age structure
admissible control operator
null controllability
population dynamics
Opis:
Given a linear dynamical system, we investigate the linear infinite dimensional system obtained by grafting an age structure. Such systems appear essentially in population dynamics with age structure when phenomena like spatial diffusion or transport are also taken into consideration. We first show that the new system preserves some of the wellposedness properties of the initial one. Our main result asserts that if the initial system is null controllable in a time small enough then the structured system is also null controllable in a time depending on the various involved parameters.
Źródło:
Control and Cybernetics; 2019, 48, 2; 231-260
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of six year herbicides use on population dynamics of migratory plant parasitic nematodes in the field
Autorzy:
Kornobis, S
Powiązania:
https://bibliotekanauki.pl/articles/65633.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Pratylenchus neglectus
Helicotylenchus digonicus
plant protection
population dynamics
herbicide
nematode
Tylenchorhynchus dubius
Mesocriconema curvatum
Opis:
The 1987-1992 microplots experiment was conduced in agricultural field conditions under routine crop, and herbicide rotation. Over the experimental time only the endoparasitic species, Pratylenchus neglectus revealed significant changes in the population dynamics. In a sugar beet the nematode population decreasad in microplots treated with chloridazon (3.25 kg/ha) or cycloate (4.44 kg/ha) but increased in the control. In a winter rape the population of P. neglectus increased in microplots treated with benazolin (0.45 kg/ha) but it decreased in the control. The observed trends in the dynamics of the nematode population persisted for one year only, and they were changed with the rotation of crop and herbicides. No differences betwen herbicides treated, and control microplots were observed with linuron + bentazone (1.0 kg/ha + 1.5 kg/ha, respectively) was applied to pea culture, metabenzthiazuron (2.8 kg/ha) was applied to a winter wheat, and MCPA as sodium salt + dicamba as sodium salt (0.725 kg/ha + 0.08 kg/ha, respectively) was applied to a spring wheat. The examined crops and herbicides did not markedly affect the population dynamics of ectoparasitic Tylenchorhynchus dubius. Helicotylenchus digonicus and Mesocriconema curvatum.
W latach 1987-1992 przeprowadzono doświadczenie w warunkach polowych, przy zastosowaniu komercyjnego płodozmianu i herbicydów. W czasie doświadczenia tylko endopasożytniczy gatunek Pratylenchus neglectus wykazał zauważalne różnice w dynamice populacji pod wpływem stosowania herbicydów. Na buraku cukrowym populacja nicieni spadła pod wpływem stosowania chloridazon (3,25 kg/ha) lub cycloate (4,44 kg/ha), podczas gdy na kontroli bez herbicydów - wzrosła. Na rzepaku ozimym populacja P. neglectus zwiększyła się pod wpływem stosowania benazolin (0,45 kg/ha), a na kontrolowanych bez herbicydów spadła. Te trendy w dynamice populacji utrzymały się tylko w jednym roku i uległy zmianie po zmianie uprawy i herbicydów. Nie zaobserwowano różnic w dynamice populacji P. neglectus pod wpływem zastosowania linuron + bentazone (1,0 kg/ha + 1,5 kg/ha, odpowiednio) w uprawie grochu, methabenzthiazuron (2,8 kg/ha) w pszenicy ozimej oraz MCPA w postaci soli sodowej+ dicamba w postaci soli sodowej (0,725 kg/ha+ 0,08 kg/ha) w pszenicy jarej. Żaden z herbicydów nie spowodował zauważalnych zmian w dynamice populacji nicieni ektopasożytniczych: Tylenchorhynchus dubius, Helicotylenchus digonicus i Mesocriconema curvatum.
Źródło:
Journal of Plant Protection Research; 2000, 40, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the population dynamics, reproductive biology and growth of Succinea putris (Linnaeus 1758) (Gastropoda:Pulmonata: Succineidae)
Autorzy:
Kuznik-Kowalska, E.
Pokryszko, B.M.
Prockow, M.
Oczkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/83348.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
population dynamics
reproductive biology
animal growth
snail
terrestrial snail
Succinea putris
Gastropoda
Pulmonata
Succineidae
Opis:
Selected life-cycle and population parameters of a common Euro-Siberian wetland snail – Succinea putris (L.) – were studied in the field and in the laboratory. In the field the snails reproduced at least from April till September, with April–May and August–September peaks; only one such peak (April) was observed in the laboratory, though the snails reproduced throughout the year. The changes in population size structure in the field and the laboratory results (life span 210–420 days, mean 309) indicated semelparity. Growth in the laboratory included two phases: slow (November–March) and fast (June–October); which phase came first during the life cycle depended on the date of hatching. The growth rate in the field corresponded closely with the fast-phase growth in the laboratory. The smallest reproducing individual was slightly over 2.8 whorls; snails of 3.0 whorls were regularly observed to produce eggs (maximum number of whorls in adults: 4.0). Sexual maturity was attained in ca. 160 days. The eggs (non-calcified, translucent, spherical, 1.7–2.0 mm in diameter) were laid in batches, 5–64 per batch; the eggs within a batch were glued together. The batch dimensions were 3.5–25.7×2.2–24.7 mm. The time to lay a batch was 20–35 minutes. Forty-eight snails produced 74 batches within 12 months. The duration of the egg phase was 11–28 days, which might indicate egg retention of varied duration; hatching was asynchronous, spanning 1–12 days within a batch. The hatchlings had shells of 1.1–1.2 whorls; hatching success was 95%. Neither uniparental reproduction, nor egg or juvenile cannibalism were observed. When compared to data in the literature, our results imply that Succinea putris displays substantial local variation in life-cycle traits.We also provide an overview table to discuss similarities and adaptive radiation in the European succineid species.
Źródło:
Folia Malacologica; 2013, 21, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identyfikacja czynników ekonomicznych oddziałujących na dynamikę populacji ludzkiej
Identification of the Economic Factors Affecting the Population Dynamics
Autorzy:
Kozioł, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/548865.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
kapitał ludzki
dynamika populacji
wynagrodzenie
instytucje ekonomiczne
human capital
population dynamics
remuneration
economic institution
Opis:
artykule dokonano identyfikacji najważniejszych determinantów ekonomicznych wpływa-jących na dynamikę kapitału ludzkiego. W pierwszej części przedstawiono alternatywny model pomiaru kapitału ludzkiego, jego strukturę oraz zasady opłacenia. Dalsza część pracy stanowi uszczegółowienie problematyki opłacenia kapitału ludzkiego z punktu widzenia nadrzędnej kwe-stii jaką stanowi stworzenie warunków do zachowania i zrównoważonego wzrostu kapitału ludz-kiego. W trakcie analiz wykazano, że najważniejszymi czynnikami determinującymi dynamikę kapitału ludzkiego jest zapewnienie płacy godziwej drogą odpowiedniej polityki gospodarczej oraz odpowiednich instytucji rynku pracy. Ponadto, ważną kwestią jest konstrukcja odpowiednie-go systemu ubezpieczeń społecznych i podatku dochodowego od płac. Badania wykazały, że jest możliwość ustalenia stawek w sposób umożliwiający skuteczne zabezpieczenie społeczne przy jednoczesnym zachowaniu możliwości pełnego odtworzenia wartości kapitału ludzkiego.
This paper presents the identification of the main economic determinants of the human capi-tal dynamics. The first part is a presentation of the alternative model of human capital, its structure and remuneration. The main part of the article is specification of a process of human capital remu-neration from the point of view of the conditions for the preservation and sustainable development of human capital. Analysis showed that the most important factors determining the dynamics of human capital are the ones which assure the fair wages. Especially, the appropriate economic policy and the relevant labor market institutions. In addition, an appropriate system of social insur-ance and payroll tax is important. Studies have shown, that it is possible to set the rates in such a way to enable effective social protection while allowing full restoration of human capital.
Źródło:
Nierówności Społeczne a Wzrost Gospodarczy; 2014, 38; 240-252
1898-5084
2658-0780
Pojawia się w:
Nierówności Społeczne a Wzrost Gospodarczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periodicity of the Population Size of an Age-Dependent Model With a Dominant Age Class by Means of Impulsive Perturbations
Autorzy:
Covachev, V.
Powiązania:
https://bibliotekanauki.pl/articles/929760.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika populacji
równanie nieliniowe
population dynamics
age-dependent model
periodic solutions
nonlinear delay equations
Opis:
For an age-dependent model with a dominant age class an w-periodic regime of the population size is sought by means of impulsive perturbations. For both noncritical and critical cases of first order the problem is reduced to operator systems solvable by a convergent simple iteration method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 1; 147-155
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anti-National Population Policy in the Ukrainian SSR during the 1960s–1970s: The Titular Nation of Ukraine as an Example
Autorzy:
Kindrachuk, Nadia Muroslavivna
Powiązania:
https://bibliotekanauki.pl/articles/519881.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Tematy:
demographic policy
migration
titular nation
the Ukrainians
population dynamics
territorial location
assimilation
denationalization
Russification
Opis:
The article studies the anti-national population policy of the USSR taking as the example the titular nation of Ukraine during the 1960s –1970s. The author investigates inner republican effects of migration (increasing the number of mixed marriages and the displacement of the Ukrainian language by Russian) and studies official statistics – Union censuses in 1959, 1970, and 1979 which allow a comparative analysis of the dynamics of the Ukrainians and territorial distribution in different regions of the republic. The author has found that in the outlined period the USSR government always created anti-Ukrainian background at all levels, which formed a widespread anti-national population policy of Russification and assimilation of the Ukrainians; there was an artificial formation of national-ethnic structure of the Ukrainian SSR and forcing international convergence to create a “single Soviet people”. Any statement or reference to Ukrainian national problems was regarded as a ground for harassment and persecution by the Soviet authorities and accusation of “Ukrainian bourgeois nationalism”. It has been proved that Ukrainians were the dominant nation almost throughout the USSR in the outlined period. The number of Ukrainians increased exclusively trough natural population growth, while the number of representatives of the Russian nation increased as a result of internal migration. The article presents the idea that Ukraine was one of the centers of accumulation of immigration flows in the Soviet Union, and because of this fact the multicultural Ukrainian SSR society, which basically constituted of Ukrainians, gradually turned into a bi-national society, where the Ukrainian majority coexisted with the continuously growing Russian minority. Resettlements were carried out primarily for political reasons and their aim was to deprive the native people of their national characteristics – language, culture, and the like. Demographic, economic, and social processes that were spread under the slogan of “internationalist aid” substantially changed the proportion of native and settled populations in some regions.
Źródło:
Historia i Polityka; 2015, 14(21); 33-41
1899-5160
2391-7652
Pojawia się w:
Historia i Polityka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intensity of damages made by wild boars under diverse environmental conditions on a background of the population dynamics
Intensywność występowania szkód wyrządzonych przez dziki w zróżnicowanych warunkach środowiskowych, na tle dynamiki liczebności populacji
Autorzy:
Flis, M.
Powiązania:
https://bibliotekanauki.pl/articles/2196886.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
hunting damage
intensity
wild boar
environment condition
background
population dynamics
food preference
agriculture
cultivation
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica; 2013, 31, 1; 10-21
0239-4243
2083-7399
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long term variation of sardine Sardina pilchardus spawning along the Atlantic coast of Northwest Africa (21–26°N): characterization and spatiotemporal variability in spawning habitat
Autorzy:
Abdelouahab, H.
Berraho, A.
Baibai, T.
Larissi, J.
Charib, S.
Agouzouk, A.
Makaoui, A.
Ettahiri, O.
Errhif, A.
Powiązania:
https://bibliotekanauki.pl/articles/2079005.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
pelagic fish
sardine
Sardina pilchardus
population dynamics
environment change
spawning
sea surface
temperature
Atlantic coast
Opis:
Small pelagic fish such as sardine show strong recruitment variability often associated with environmental changes influencing the spawning process and ultimately, affecting population dynamics. Sardine (Sardina pilchardus, Walbaum 1792) is one of the most exploited pelagic species along the northwest African coast. The main spawning occurs during the cold season (autumn—winter). A time-series autumn—winter surveys extending from 1994 to 2015 sampled sardine eggs, along the southern area of the Moroccan Atlantic coast (26°N—21°N) were analyzed. The present work focuses on examining the inter-annual variability of the spawning habitat by analyzing the spatial-temporal variability of sardine egg distribution and density extracted from the data collected over the period 1994—2015. Generalized additive models (GAM) were used to detect the relationships between the sardine distribution, expressed as egg density and the presence or absence data and relevant hydrobiological environmental variables, such as salinity, temperature and zooplankton biomass. The generalized additive models showed significant relationships between the environment variables (SST, SSS and Zooplankton biomass) and sardine density, but not with sardine presence. Given that the study area is characterized by high mesoscale features and significant upwelling activities, the variability of upwelling processes could explain the changes of spawning ground position and thermal window
Źródło:
Oceanologia; 2021, 63, 1; 1-11
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Lowered Temperatures on the Migration Activites of the Grain Weevil Sitophilus granarius L (Coleoptera, Curculionidae)
Wpływ obniżonej temperatury na aktywność migracyjną wołka zbożowego Sitophilus granarius L (Coleoptera, Curculionidae)
Autorzy:
Kłyś, M.
Powiązania:
https://bibliotekanauki.pl/articles/389261.pdf
Data publikacji:
2010
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
Sitophilus granarius L.
aktywność migracyjna
liczebność populacji
śmiertelność
migration activity
population dynamics
mortality
sex ratio
Opis:
The subject of our study was the grain weevil Sitophilus granarius L. In this work based on laboratory research, it has been presumed that lowering environment temperatures can have an effect on emigration and immigration processes, and thus on the spread of this pest. The control culture was conducted at a temperature of 28 oC. The environment temperature of the experimental cultures was changed weekly, and consecutively set at: 25 oC, 10 oC, 21 oC and 25 oC. In conditions facilitating the migration of adult S. granarius specimens, the lowered temperature of the surroundings reduced the population’s migration activity, and a particular drop in female migration activity was observed. Females are more sensitive to the effects of lower temperatures.
Obiektem badań był wołek zbożowy Sitophilus granarius L. W badaniach laboratoryjnych przyjęto założenie, że obniżenie temperatury środowiska może wywierać wpływ na procesy emigracji i imigracji, a tym samym na rozprzestrzenianie się tego szkodnika. Hodowle kontrolne prowadzono w temperaturze 28 oC. W hodowlach eksperymentalnych co tydzień zmieniano temperaturę środowiska, stosując kolejno: 25 oC, 10 oC, 21 oC i 25 oC. W warunkach umożliwiających migracje osobnikom dorosłym S. granarius obniżenie temperatury otoczenia spowodowało zmniejszenie aktywności migracyjnej populacji, a szczególnie spadek aktywności migracyjnej samic. Samice są bardziej wrażliwe na oddziaływanie niskich temperatur.
Źródło:
Ecological Chemistry and Engineering. A; 2010, 17, 10; 1349-1354
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal Harvesting of the Nonlinear Population Dynamics
Autorzy:
Anita, S.
Powiązania:
https://bibliotekanauki.pl/articles/929748.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamika populacji
stan optymalny
population dynamics
Caratheodory solution
optimal harvesting
fractional step scheme
necessary optimality conditions
Opis:
This paper deals with an optimal harvesting problem for a nonlinear age-dependent population dynamics. The existence and uniqueness of a positive solution for the model considered is demonstrated. The existence of an optimal harvesting effort and the convergence of a certain fractional step scheme are investigated. Necessary optimality conditions for some approximating problems are established.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2000, 10, 1; 113-122
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of environmental factors on the population dynamics of key zooplankton species in the Gulf of Gdansk (Southern Baltic Sea)
Autorzy:
Musialik-Koszarowska, M.
Dzierzbicka-Glowacka, L.
Weydmann, A.
Powiązania:
https://bibliotekanauki.pl/articles/48452.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
environmental factor
abiotic factor
population dynamics
zooplankton
Acartia
Temora longicornis
Pseudocalanus
biomass
Gdansk Gulf
Baltic Sea
Źródło:
Oceanologia; 2019, 61, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Life in sympatry: coexistence of native Eurytemora affinis and invasive Eurytemora carolleeae in the Gulf of Finland (Baltic Sea)
Autorzy:
Sukhikh, N.
Souissi, A.
Souissi, S.
Holl, A.-C.
Schizas, N.V.
Alekseev, V.
Powiązania:
https://bibliotekanauki.pl/articles/48676.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Eurytemora affinis
Eurytemora carolleeae
Copepoda
zooplankton
invasive species
native species
population dynamics
Finland Gulf
Baltic Sea
Źródło:
Oceanologia; 2019, 61, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asymptotic behaviour of a discrete dynamical system generated by a simple evolutionary process
Autorzy:
Karcz-Dulęba, I.
Powiązania:
https://bibliotekanauki.pl/articles/907236.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ewolucja fenotypowa
dynamika populacji
populacja mała
zachowanie asymptotyczne
phenotypic evolution
population dynamics
small populations
asymptotic behaviour
space of population states
Opis:
A simple model of phenotypic evolution is introduced and analysed in a space of population states. The expected values of the population states generate a discrete dynamical system. The asymptotic behaviour of the system is studied with the use of classical tools of dynamical systems. The number, location and stability of fixed points of the system depend on parameters of a fitness function and the parameters of the evolutionary process itself. The influence of evolutionary process parameters on the stability of the fixed points is discussed. For large values of the standard deviation of mutation, fixed points become unstable and periodical orbits arise. An analysis of the periodical orbits is presented.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2004, 14, 1; 79-90
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demographic responses of boreal-montane orchid Malaxis monophyllos (L.) Sw. populations to contrasting environmental conditions
Autorzy:
Jermakowicz, E.
Brzosko, E.
Powiązania:
https://bibliotekanauki.pl/articles/58627.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
demographic response
orchid
white adder's mouth
Malaxis monophyllos
plant population
environment condition
population dynamics
red list
plant species
anthropogenic habitat
Opis:
In an age of changes in species’ geographical ranges, compounded by climatic and anthropogenic impacts, it become important to know which processes and factors influence plant populations and their persistence in the long term. Here we investigated dynamic and fitness components in twelve populations of Malaxis monophyllos (L.) Sw., situated in different geographical (regions) and ecological (type of habitat) units. Although M. monophyllos is a rare species, characterized by highly fragmented, boreal-montane distribution range, in last few decades it successfully colonized secondary habitats in Polish uplands. Our results indicate that M. monophyllos is represented mainly by small populations, which annual spatial and temporal changes might be very high, what affects the ephemeral character of these populations, regardless of the region and type of habitat. This dynamic structure, in turn, is caused by intensive exchange of individuals in populations, as well as by their short above-ground life span. Despite the large range of variation in size and reproductive traits, we can distinguish some regional patterns, which indicate boreal region as the most optimal for M. monophyllos growth and persistence in the long term, and with montane and upland/anthropogenic populations, due to lower reproductive parameters, as the most threatened. Although it should be considered that anthropogenic populations, despite their lower reproductive parameters and instability in the long term, present an intermediate, geographical and ecological character, therefore they may be valuable in shaping, both M. monophyllos’ future range, as well as its potential for response on ongoing and future changes. In general, reproduction is the main factor differentiating of M. monophyllos populations in regions, and we can suspect that it may become the cause of the future differentiation and isolation of these populations, occurring with progressive range fragmentation.
Źródło:
Acta Societatis Botanicorum Poloniae; 2016, 85, 1
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Occurrence of two-spotted spider mite (Tetranychus urticae Koch) on Potentilla fruticosa cultivars
Autorzy:
Szafranek, P.
Powiązania:
https://bibliotekanauki.pl/articles/2081.pdf
Data publikacji:
2016
Wydawca:
Instytut Ogrodnictwa
Tematy:
Potentilla fruticosa
spider mite
population dynamics
two-spotted spider mite
Tetranychus urticae
Acari
Tetranychidae
seasonal fluctuation
Źródło:
Journal of Horticultural Research; 2016, 24, 2; 25-30
2300-5009
Pojawia się w:
Journal of Horticultural Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przestrzenne zróżnicowanie zmian zaludnienia w Krakowskim Obszarze Metropolitalnym w okresie 1988–2011
Spatial variation of population growth in Krakow Metropolitan Area in the years 1988–2011
Autorzy:
Kurek, Sławomir
Gałka, Jadwiga
Powiązania:
https://bibliotekanauki.pl/articles/1857848.pdf
Data publikacji:
2020-10-27
Wydawca:
Uniwersytet Opolski
Tematy:
metropolitan area
suburbanization
Krakow
Webb typology
population dynamics
obszar metropolitalny
suburbanizacja
Kraków
typologia Webba
dynamika zaludnienia
Opis:
Od początku lat 90. XX w. strefy podmiejskie dużych miast w Polsce (bez względu, jaki zasięg ich przyjmiemy) charakteryzują się swoistymi przemianami demograficznymi, odróżniającymi je od miast i obszarów wiejskich w granicach administracyjnych. Zmniejszenie natężenia migracji ze wsi do miast i zmiana ich kierunku na miasto wieś, a w szczególności miasto–strefa podmiejska spowodowały znaczące zmiany struktury wieku, a także ruchu naturalnego i, co za tym idzie, dynamiki zaludnienia gmin otaczających duże ośrodki miejskie. Celem badań jest określenie zmian w koncentracji przestrzennej ludności na obszarze Krakowskiego Obszaru Metropolitalnego. Przeanalizowano także zmiany w relacjach pomiędzy głównymi składowymi przyrostu rzeczywistego ludności (przyrostem naturalnym i saldem migracji), aby określić poziom rozwoju procesów suburbanizacji demograficznej w poszczególnych strefach KOM. Analizę przeprowadzono w ujęciu gminnym w czterech przekrojach czasowych: 1988, 1995, 2002 oraz 2011 r. Badania zostały sfinansowane ze Środków Narodowego Centrum Nauki przyznanych na podstawie decyzji numer DEC-2012/05/B/HS4/04200 w ramach projektu pt. „Przekształcenia wybranych struktur społeczno-demograficznych Krakowskiego Obszaru Metropolitalnego”.
Since the beginning of the 1990s, suburban areas of large cities in Poland (regardless their extension) have a specific demographic changes which distinguish them from urban and rural areas within the administrative boundaries. The decline of the volume of migration from rural areas to cities and change of their direction from urban into rural areas, especially from urban to suburban areas have caused significant changes in the age structure and vital statistics and, hence, population dynamics within communities surrounding major urban centers. The aim of research is to entail changes in the concentration of the population in the Krakow Metropolitan Areas. We analyzed the changes in the relationships between the main components of the population growth (natural increase and net migration) to determine the level of demographic surbanization processes in the zones of Krakow Metropolitan Areas. The analysis was conducted in communes in four time sections: 1988, 1995, 2002 and 2011. The study was funded by the National Science Center, awarded by decision number DEC-2012/05/B/HS4/04200 for the project „Transformation of selected social-demographic structures in Krakow Metropolitan Area”.
Źródło:
Studia Miejskie; 2013, 12; 61-77
2543-5302
2082-4793
Pojawia się w:
Studia Miejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global aging - the nature of longevity risk
Globalne starzenie się – natura ryzyka długowieczności
Autorzy:
Trzpiot, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/658197.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
ryzyko długowieczności
transfer ryzyka
stochastyczne modelowanie śmiertelności
dynamika populacji
longevity Risk
risk transfer
stochastic mortality
population dynamics
Opis:
W artykule przedstawiamy badania nad problemem modelowania ryzyka długowieczności ryzyka. Omawiamy pojęcie ryzyka długowieczności, aby lepiej zrozumieć wszystkie powiązane wyzwania w sferze zarządzania ryzykiem z punktu widzenia finansowego i ubezpieczeniowego. Artykuł prezentuje również opinię na temat praktycznych zadań związanych z rosnącą długości życia. Jednocześnie, wzrost długości życia zwiększył potrzebę rozwoju rynków kapitałowych, celem zarządzania i transferu ryzyka. Dlatego, również podkreślamy przyszłe zarządzanie ryzykiem długowieczności z finansowego punktu widzenia.
In this paper we investigate the latest developments on longevity risk modelling. We first introduce longevity risk to allow for a better understanding of the related challenges in term of risk management from both a financial and insurance point of view. The article also provides a global view on the practical issues of longevity. Simultaneously, the development on the longevity has enhanced the need of capital markets as to manage and transfer the risk. Therefore, we also highlight future developments on longevity risk management from a financial point of view.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2016, 5, 325
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution to the characteristic of Cladium mariscus [L.] Pohl population in the initial zone of floating mat on an oligo-humotrophic lake in North-Eastern Poland
Autorzy:
Namura-Ochalska, A
Powiązania:
https://bibliotekanauki.pl/articles/56588.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
capacity
Cladium mariscus
Polska
spatial structure
oligo-humotrophic lake
clonal growth
population dynamics
seed germination
diaspore production
Opis:
In the initial phase of growth in an oligo-humotrophic lake, Cladium mariscus forms a dense and tall sawgrass bed invading the open water in the form of a floating mat. High densities of submerged evergreen perennial stems of C. mariscus, over two metres high and abundantly fruiting, ensure its persistence, and form a natural barrier to the invasion of other species. Dense mats of sawgrass are formed as a result of clonal and rhizome growth. Although diaspore production is abundant under natural conditions, only vegetative propagation of stems was observed. In different variants of the experiment only seeds wintering on stems of mother plants were capable of germinating. Hard seed coats had an important effect on the germination capacity of seeds.
Źródło:
Acta Societatis Botanicorum Poloniae; 2005, 74, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika populacji Genistella sagittalis (L.) Gams in Hegi w Puszczy Kozienickiej w okresie 1997-2007
Dynamics of Genistella sagittalis [L.] Gams in Hegi population in the Kozienicka Primeval Forest in the period of 1997-2007
Autorzy:
Krechowski, J.
Piórek, K.
Borkowska, L.
Powiązania:
https://bibliotekanauki.pl/articles/1012831.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
Puszcza Kozienicka
dynamika populacji
Genistella sagittalis
lesnictwo
janowczyk skrzydlaty
krzewy
genistella sagittalis
kozienicka primeval forest
population dynamics
Opis:
A new stand of rare in the Polish flora subshrub of Fabaceae family − Genistella sagittalis was recorded in 1997 in the area of Kozienicki Landscape Park and subjected to monitoring. The analysis covers the observation period from 1997 to 2007. On the basis of phytosociological relevés a negative effect of such factors as undergrowth overshading and interspecies competition on condition of Genistella sagittalis population was stated. The species demonstrates expansive tendencies in insolated habitats of little undergrowth cover. The population seems to be stabile and is not endangered at present.
Źródło:
Sylwan; 2008, 152, 07; 67-72
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emigration Acitivity of Rice Weevil Sitophilus oryzae L (Coleoptera, Curculionidae) in Conditions of Reduced Temperature
Aktywność emigracyjna wołka ryżowego Sitophilus oryzae L (Coleoptera, Curculionidae) w warunkach obniżonej temperatury
Autorzy:
Kłyś, M.
Powiązania:
https://bibliotekanauki.pl/articles/389578.pdf
Data publikacji:
2011
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
wołek ryżowy
aktywność emigracyjna
liczebność populacji
wskaźnik płci
Sitophilus oryzae L.
emigration activity
population dynamics
sex ratio
Opis:
The subject of the research was rice weevil Sitophilus oryzae L. – dangerous pest of grain crops storage. Research was held in a laboratory at the temperature 31 °C, optimal for this insect species, and reduced to 22 °C, and 70 5 % relative humidity (R.H.). The main research problem concerned the emigration activity of S. oryzae in conditions of temperature reduction. Population dynamics and sex structure of population were also analyzed. It was affirmed that rice weevil shows a very high emigration activity in temperatures both 31 °C and 22 °C. Whereas the temperature reduction to 22 °C causes drop of emigration activity to 40 % only in two time ranges after 60 and 120 days of raise ing. A higher female emigration was also observed.
Obiektem badań był wołek ryżowy Sitophilus oryzae L. - groźny szkodnik magazynowanego ziarna zbóż. Badania prowadzono w laboratorium w temperaturze 31 oC optymalnej dla tego gatunku owada i w obniżonej do 22 oC, oraz w wilgotności względnej powietrza 70 š 5 % r.h. Główny problem badawczy dotyczył aktywności emigracyjnej wołka ryżowego w warunkach obniżonej temperatury. Analizowano także dynamikę liczebności i strukturę płciową populacji S. oryzae. Stwierdzono, że wołek ryżowy wykazuje bardzo dużą aktywność emigracyjną zarówno w temperaturze 31 oC, jak i 22 oC. Obniżenie temperatury do 22 oC powoduje spadek aktywności emigracyjnej do 40 % tylko w dwóch przedziałach czasowych po 60 i 120 dniach prowadzenia hodowli. Zaobserwowano również większą emigrację samic.
Źródło:
Ecological Chemistry and Engineering. A; 2011, 18, 5-6; 717-721
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika liczebności niedźwiedzia brunatnego w Karpatach Wschodnich
The peculiarities of bear numbers dynamics in the Eastern Carpatians
Autorzy:
Khoyetskyy, P.
Powiązania:
https://bibliotekanauki.pl/articles/1339921.pdf
Data publikacji:
2013
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
Karpaty Wschodnie
fauna
niedzwiedz brunatny
Ursus arctos
populacje zwierzat
liczebnosc
dynamika populacji
dynamika liczebnosci
population dynamics
poaching
Opis:
There have been two periods of change in the dynamics of bear population in the Eastern Carpathians. The first period lasted over 50 years, starting in the late 1940s and ending in the year 2001. The second period started in the early 21st century. The bear population reached its maximum- of about 1100 individuals - in the early 1970s. Over 85% of recorded bear deaths have resulted from poaching.
Źródło:
Leśne Prace Badawcze; 2013, 74, 2; 111-116
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demograficzno-społeczne oraz przestrzenne uwarunkowania rozwojowe gminy Jaworze (woj. śląskie)
Demographic, social and spatial determinants of development of Jaworze commune (Silesian Voivodeship)
Autorzy:
Olberek-Żyła, Monika
Powiązania:
https://bibliotekanauki.pl/articles/471479.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
Tematy:
aglomeracja Bielska-Białej
dynamika zaludnienia
gmina Jaworze
migracje
suburbanizacja
agglomeration of Bielsko-Biała
population dynamics
Jaworze commune
migration
suburbanization
Opis:
Celem autorki było rozpoznanie dynamiki zaludnienia i salda migracji w gminie Jaworze na tle pozostałych gmin aglomeracji Bielska-Białej oraz identyfikacja kierunków napływu ludności do tej gminy. Po 1989 r. proces urbanizacji wyraźnie objął zachodnią część aglomeracji bielskiej, co przyczyniło się do szybkiego rozwoju Jaworza w latach 90. XX w. Gmina ta, położona w bezpośrednim sąsiedztwie Bielska-Białej, ma duże walory przyrodnicze, a pod względem atrakcyjności rezydencjalnej jest jedną z najwyżej ocenionych gmin w województwie śląskim. Stanowi więc obszar napływu migrantów nie tylko z Bielska-Białej, lecz również z innych części regionu, m.in. z konurbacji katowickiej. Istnieją przesłanki sugerujące, że gmina Jaworze osiąga już maksimum obciążenia migracyjnego z punktu widzenia zasobu wolnych terenów pod zabudowę mieszkaniową – co wymaga jednak empirycznej weryfikacji.
The author’s aim was to recognize the dynamics of population and net migration in Jaworze against the other communes of the Bielsko-Biala agglomeration and to identify inflow directions to this commune. Since 1989, the process of urbanization, has spread over most of the western part of the agglomeration, which contributed to the rapid development of Jaworze during the 1990s. Jaworze, located in the immediate vicinity of Bielsko-Biala, has high natural values . In terms of the residential attractiveness this municipality is one of the top rated ones in the whole voivodeship. Therefore, it is an area of inflow of migrants not only from Bielsko-Biala, but also from other parts of the region, including the Katowice conurbation. It is suggested that the Jaworze commune has reached maximum migration load from the point of view of the resources of land available for housing. However, this requires empirical verification.
Źródło:
Annales Universitatis Paedagogicae Cracoviensis Studia Geographica; 2014, 7; 95-107
2084-5456
Pojawia się w:
Annales Universitatis Paedagogicae Cracoviensis Studia Geographica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The occurrence of Panaphis juglandis [Goetze] and Chromaphis juglandicola [Kalt.] on walnut under the urban conditions of Lublin
Występowanie Panaphis juglandis (Goetze) i Chromaphis juglandicola (Kalt.) na orzechu włoskim w warunkach miejskich Lublina
Autorzy:
Jaśkiewicz, B.
Kmieć, K.
Powiązania:
https://bibliotekanauki.pl/articles/11541660.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
urban condition
Juglans regia
walnut
Lublin city
weather
tree
park
street
Chromaphis juglandicola
population dynamics
Panaphis juglandis
aphid
occurrence
Opis:
In the years 2003–2005 studies were conducted in the area of Lublin the aim of which was to study the population dynamics of aphids colonizing the trees of Juglans regia L. in the street and the park sites against the course of weather conditions. The weather in spring probably had no effect on the date of hatching of the larva of fundatrix, which was usually observed in the third 10-days’ period of May. On the other hand, the dry period, heat waves (above 30°C) and stormy rainfalls affected the break in the aphid population observed in July and August. The maximum population of P. juglandis was found in the second 10-days’ period of June, while that of Ch. juglandicola – at he turn of June and July. The highest number of P. juglandis was observed in 2004, while that of Ch. juglandicola in 2003. In 2003 the dominating species in both sites was Ch. juglandicola, while in the other years of studies it was P. juglandis.
W latach 2003–2005 na terenie Lublina prowadzono badania, których celem było prześledzenie dynamiki liczebności mszyc zasiedlających drzewa Juglans regia L. na stanowisku przyulicznym i parkowym na tle przebiegu warunków pogodowych. Układ pogody wiosną prawdopodobnie nie miał wpływu na termin wylęgu larw założycielek rodów, który notowano zazwyczaj w III dekadzie maja. W istotny sposób natomiast na załamywanie się liczebności mszyc, obserwowanej w lipcu i sierpniu, wpływała susza, upały (powyżej 30°C) oraz opady typu burzowego. Maksimum liczebności P. juglandis notowano w II dekadzie czerwca, natomiast Ch. juglandicola na przełomie czerwca i lipca. Najwyższą liczebność P. juglandis odnotowano w roku 2004, a Ch. juglandicola w roku 2003. Gatunkiem dominującym na obydwu stanowiskach w roku 2003 był Ch. juglandicola, natomiast w pozostałych latach badań P. juglandis.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2007, 06, 3; 15-26
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does vegetation impact on the population dynamics and male function in Anemone sylvestris L. (Ranunculaceae)? A case study in three natural populations of xerothermic grasslands
Autorzy:
Denisow, B.
Wrzesien, M.
Powiązania:
https://bibliotekanauki.pl/articles/57860.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
vegetation impact
population dynamics
male
function
Anemone sylvestris
Ranunculaceae
natural population
xerothermic grassland
rare species
shrub
plant expansion
pollen mass
pollen viability
seed set
Opis:
In Poland, like in other parts of Central Europe, dry grasslands significantly contribute to the biodiversity of both fauna and flora. Anthropogenic pressure impair many species of xerothermic habitats, and several populations face an increased risk of extinction. The goal of the study was to define factors that may affect the size of wild populations of Anemone sylvestris L., a protected species in Poland, with both a short- and long-term perspective, and to examine the influence of vegetation changes on the density, the abundance of flowering and male function (pollen production, pollen viability), as well as seed set. In situ observations were performed in 2005-2006 and 2011-2012 in three populations located on the Lublin Upland, SE Poland. The reduction in population density and A. sylvestris blooming was exacerbated by the expansion of the shrubs, but not by Brachypodium pinnatum. Male characteristics of A. sylvestris, i.e. pollen amount per multi-staminate flowers or pollen viability appeared to decrease under pressure of shrub competition. Populations with limitation of male function had impaired degree of seed set. Various consequences for the functioning of populations within a metapopulation system can be expected due to substantial qualitative and quantitative disorders in pollen traits. It is crucial that successful recovery programs for A. sylvestris primary should aim to conserve and manage the habitat.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of number of Metopolophium dirhodum (Walk.) (Hemiptera, Aphididae) occurring on shrubs of roses in Lublin
Dynamika liczebności Metopolophium dirhodum (Walk.) (Hemiptera, Aphididae) zasiedlającej krzewy róż w Lublinie
Autorzy:
Kmieć, K.
Powiązania:
https://bibliotekanauki.pl/articles/11364560.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
rugosa rose
multiflowered rose
Grandhotel rose
Hemiptera
park rose
Lublin city
border rose
Aphididae
population dynamics
shrub
Metopolophium dirhodum
rose
occurrence
aphid
Opis:
The purpose of the studies was to observe the dynamics of number of Metopolophium dirhodum (Walk.) on rugosa rose, multiflowered rose, park rose cv. ‘Grandhotel’ and different varieties of border roses. Observations were conducted in four different sites in the green area of Lublin in the years 2001–2003. M. dirhodum was observed on all the analyzed roses. Annually this aphid colonized only the shrubs of rugosa rose and park rose ‘Grandhotel’ in all the sites. This is a host-alternating species, with the migration to the summer host of obligatory character (the colonies were observed in spring and autumn). The weather conditions had a significant effect on the date of the spring appearance and the autumn disappearance of aphids. The most numerous aphids were observed in the street site, while in the park one the population of this aphid was the lowest. Rosa rugosa was exceptionally willingly colonized by M. dirhodum. Those aphids occurred there in much higher numbers as compared with the other roses.
Celem przeprowadzonych badań było prześledzenie dynamiki liczebności mszyc Metopolophium dirhodum (Walk.) na róży pomarszczonej, wielokwiatowej, parkowej odmiany ‘Grandhotel’ oraz na różnych odmianach róż rabatowych. Obserwacje prowadzono w latach 2001–2003 w czterech odmiennych stanowiskach na terenie zieleni miejskiej Lublina. M. dirhodum obserwowano na wszystkich analizowany różach. Rokrocznie i we wszystkich stanowiskach mszyca ta zasiedlała jedynie krzewy róży pomarszczonej i róży parkowej ‘Grandhotel’. Jest to gatunek różnodomny, u którego migracja na żywiciela letniego ma charakter obligatoryjny (kolonie notowano wiosną oraz jesienią). Na terminy wiosennego pojawu oraz jesiennego zaniku mszyc w istotny sposób wpływał przebieg warunków pogodowych. Najliczniej mszyce te występowały na stanowisku przyulicznym. Wyjątkowo chętnie M. dirhodum zasiedlała krzewy R. rugosa, na której występowała w wielokrotnie większej liczebności w porównaniu z innymi różami.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2006, 05, 2; 11-21
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Emigration activity of the saw-toothed grain beetle Oryzaephilus surinamensis L. (Coleoptera: Silvanidae) in various environmental temperatures
Autorzy:
Klys, M.
Powiązania:
https://bibliotekanauki.pl/articles/65526.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
emigration activity
saw-toothed grain beetle
Oryzaephilus surinamensis
Coleoptera
Silvanidae
environment temperature
sawtoothed grain beetle zob.saw-toothed grain beetle
population dynamics
sex ratio
Opis:
The study pertained to the saw-toothed grain beetle Oryzaephilus surinamensis L., a dangerous pest of stored food products. The studies were carried out in the laboratory. Thermostats were set at a temperature of 31°C; an optimum temperature for this insect species, and in temperatures lowered to 28 and 22°C. The relative air humidity was kept at 60 ±5% relative humidity (RH). The main topic of the study was to examine the effect of lower temperatures in the environment, on the emigration activity of O. surinamensis. In these conditions, the population dynamics and the sex structure in O. surinamensis populations were also studied. The saw-toothed grain beetle was found to display very high emigration activity at 31 and 28°C. Lowering the temperature to 22°C caused a decrease in emigration activity and total inhibition of emigration activity until the 120th day of the experiment. A higher emigration levels among females rather than males, was also observed.
Źródło:
Journal of Plant Protection Research; 2012, 52, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Próba oceny wpływu podszytów liściastych w drzewostanach sosnowych na liczebność motyli brudnicy mniszki (Lymantria monacha L.) w Nadleśnictwie Tuczno
Attempt to assess the impact of hardwood underbrush in pine stands on the population density of nun moth [Lymantria monacha L.] butterflies in the Tuczno Forest District
Autorzy:
Michalski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1015725.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany sosnowe
dynamika populacji
wystepowanie
Lymantria monacha
owady
szkodniki roslin
drzewa lisciaste
brudnica mniszka
lesnictwo
Nadlesnictwo Tuczno
podszyt
liczebnosc
lymantria monacha
butterflies
underbrush
population dynamics
Opis:
In the years 1996−2003, observations on the population density of nun moth butterflies were carried out in pine stands with the presence of underbrush and in a comparative group of stands without this layer. The objective of this study was to assess the impact of underbrush on the abundance of nun moth butterflies. Catches of butterflies were carried out using pheromone traps with Lymodor dispenser. In each stand one trap was hanged on the selected experimental trees. The number of butterflies in stands with hardwood underbrush was lower than in a comparative group of stands without this layer. In stands without underbrush both the mean and maximum numbers of the caught butterflies were greater. The butterfly population dynamics in those stands was higher.
Źródło:
Sylwan; 2007, 151, 08; 42-48
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aphids [Homoptera, Aphidodea] inhabiting the shrubs of Pinus mugo Turra in the green areas of Lublin. Part I. The population dynamics
Mszyce [Homoptera, Aphidodea] zasiedlajace krzewy Pinus mugo Turra na terenie zieleni miejskiej Lublina. Czesc I. Dynamika liczebnosci populacji
Autorzy:
Jaskiewicz, B
Slawinska, A.
Powiązania:
https://bibliotekanauki.pl/articles/27078.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Cinara pini
Pinus mugo
Aphidodea
Pineus pini
Lublin city
Schizolachnus pineti
population dynamics
shrub
Homoptera
city green area
Eulachnus rileyi
green area
mountain pine
aphid
Opis:
The studies were conducted on the shrubs of mountain pine (Pinus mugo Turra) in the years 1999-2001. Observations were performed on the plants growing in the green areas of Lublin in two sites: a street site (A) and a park one (B). The purpose of the studies was to establish the species composition and the population dynamics of aphids inhabiting dwarf mountain pine. The studies on the shrubs of the mountain pine found out the presence of four species of aphids: Cinara pini L., Schizolachnus pineti F., Eulachnus rileyi (Will.) and Pineus pini (Ratz.). Among those, only C. pini occurred in both sites in each of the studied years. Weather conditions had an effect on the development of aphid population. A delayed period of vegetation, air temperatures above 30°C as well as stormy rainfalls considerably limited the population of aphids.
Badania prowadzono na krzewach sosny górskiej (Pinus mugo Turra) w latach 1999-2001. Obserwacjami objęto rośliny rosnące na terenach zieleni miejskiej Lublina na dwóch stanowiskach: przyulicznym (A) i parkowym (B). Celem pracy było ustalenie składu gatunkowego oraz dynamiki populacji mszyc zasiedlających kosodrzewinę. W wyniku przeprowadzonych badań na krzewach sosny górskiej stwierdzono obecność czterech gatunków mszyc: Cinara pini L., Schizolachnus pineti F., Eulachnus rileyi (Will.) i Pineus pini (Ratz.). Spośród nich tylko C. pini występowała w każdym roku badań na obydwu stanowiskach. Na rozwój populacji mszyc miały wpływ warunki pogodowe. Opóźniony okres wegetacji, temperatury powietrza powyżej 30°C oraz opady typu burzowego znacznie zmniejszały liczebność mszyc.
Źródło:
Acta Agrobotanica; 2005, 58, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane parametry populacyjne zająca szaraka (Lepus europaeus L.) w rejonach największej liczebności gatunku w Polsce
Population parameters of brown hare (Lepus europaeus L.) in regions of the species highest density in Poland
Autorzy:
Misiorowska, M.
Ludwisiak, L.
Nasiadka, P.
Powiązania:
https://bibliotekanauki.pl/articles/991358.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lowiectwo
zwierzeta lowne
zajac szarak
Lepus europaeus
populacje zwierzat
struktura populacji
struktura wiekowa
struktura plciowa
dynamika populacji
brown hare
eye lens
age structure
population dynamics
poland
Opis:
The paper presents the selected indicators of hare populations in Poland. The material consisted of 528 hares acquired during traditional hunts. For each hunted hare we specified its weight, sex and age. All individuals were classified into two age groups: the first comprised juveniles (up to 12 months of age), while the other – adults (over 12 months). The ratio of young individuals in relation adults varies a lot (26−56%). The males to females ratio was approximately 1:1 with a slight advantage in favor of females. Reproductive rate was between 0.36 and 1.26, while reproductive success – 0.7−2.7. Average weight of hunted hares ranged between 3.42 and 4.32 kg. No significant differences in body weight were noticed within gender groups (Z=1.298, p>0.05, Mann−Whitney U test). However, they were found within the age groups (Z=–9.657, p <0.05, Mann−Whitney U test).
Źródło:
Sylwan; 2014, 158, 12; 901-910
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Explaining the Dynamics of Small Towns in Western France by Testing ThWyjaśnianie dynamiki małych miast w zachodniej Francji poprzez testowanie trzech możliwych czynnikówree Possible
Wyjaśnianie dynamiki małych miast w zachodniej Francji poprzez testowanie trzech możliwych czynników
Autorzy:
Baudelle, Guy
Buron, Louis-Thibault
Powiązania:
https://bibliotekanauki.pl/articles/1628088.pdf
Data publikacji:
2021-05-14
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
small towns
Western France
population dynamics
growth factors
railway service
coast
metropolitan areas
małe miasta
zachodnia Francja
dynamika populacji
czynniki wzrostu
usługi kolejowe
wybrzeże
obszary metropolitalne
Opis:
In international literature, small cities are often presented as the weak link within the urban system due to their lower growth rate and the threat of shrinking in the context of metropolisation. However their population dynamics are highly variable between places, determined by a number of factors, such as the national and regional demographic trends or the local economic base. This article proposes a regional case study on Western France, examining their demographic changes from 1990 to 2015. Three possible factors based on underlying assumptions are tested: 1. the proximity of larger cities as a possible revitalisation factor due to urban sprawl; 2. The vicinity of the coast attributed to the growing role of residential attractiveness; 3. In a more original way, the distance to a railway station as a potential factor, boosted by the recent passenger railway service strengthening. The results are counter-intuitive and the assumptions only partially validated, which invites us to reassess the relevance of the analysis of urban dynamics by size class.
Wyjaśnianie dynamiki małych miast w zachodniej Francji poprzez testowanie trzech możliwych czynnikówWyjaśnianie dynamiki małych miast w zachodniej Francji poprzez testowanie trzech możliwych czynnikówWyjaśnianie dynamiki małych miast w zachodniej Francji poprzez testowanie trzech możliwych czynnikówW literaturze międzynarodowej małe miasta są często przedstawiane jako słabe ogniwo w systemie miejskim ze względu na niższą stopę wzrostu i groźbę kurczenia się w kontekście metropolizacji. Jednak ich dynamika zaludnienia jest bardzo zróżnicowana w zależności od miejsca, o czym decyduje szereg czynników, takich jak krajowe i regionalne trendy demograficzne czy lokalna baza ekonomiczna. W artykule zaproponowano regionalne studium przypadku dotyczące zachodniej Francji, badające zmiany demograficzne w latach 1990–2015. Badane są trzy możliwe czynniki oparte na podstawowych założeniach: 1. bliskość  większych miast jako potencjalny czynnik rewitalizacji z powodu rozrastania się miast; 2. bliskość wybrzeża przypisywana rosnącej roli atrakcyjności mieszkaniowej; 3. odległość do dworca kolejowego jako potencjalny czynnik, wzmocniony przez niedawne polepszenie usług kolei pasażerskiej. Wyniki są niezgodne z intuicją, a założenia tylko częściowo potwierdzone, co skłania do ponownej oceny trafności analizy dynamiki miejskiej według klas wielkości.  
Źródło:
Rozwój Regionalny i Polityka Regionalna; 2021, 54; 35-58
2353-1428
Pojawia się w:
Rozwój Regionalny i Polityka Regionalna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Występowanie kornika drukarza Ips typographus (L.) (Coleoptera, Curculionidae, Scolytinae) po wiatrołomie z 2013 roku w Dolinie Kościeliskiej w Tatrzańskim Parku Narodowym
Occurrence of Ips typographus (L.) after wind damage in the Koscieliska Valley of the Tatra National Park
Autorzy:
Grodzki, W.
Gąsienica-Fronek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1293108.pdf
Data publikacji:
2017
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
lesnictwo
parki narodowe
Tatrzanski Park Narodowy
Dolina Koscieliska
drzewostany uszkodzone
drzewostany swierkowe
wiatrolomy
kornik drukarz
Ips typographus
wystepowanie
bark beetles
Norway spruce
population dynamics
damage management
Opis:
At the end of 2013, Norway spruce stands in the area of the Tatra National Park were severely damaged by strong storms especially in the Kościeliska Valley region. In the following spring of 2014, a survey recording the occurrence of the spruce bark beetle Ips typographus (Coleoptera, Curculionidae, Scolytinae) was initiated in order to describe the dynamics of beetle reproduction in relation to protection measures executed in wind-damaged stands. Ten research plots with 20 trees each were established in a so-called active protection zone, where the broken and fallen trees had been processed and removed in 2014, and in a passive protection zone, where no actions were taken, and the dynamics of Norway spruce mortality due to bark beetle infestation including quantitative parameters (infestation density, sex ratio of beetle populations) were examined. The entomological analyses were performed on 25×25 cm large bark samples taken from four (active zone) or two (passive zone) tree sections. In the first year of the survey, no infested standing trees were recorded on the plots and the colonisation of fallen and broken trees was very weak. In the second year (2015), infestations appeared in larger numbers on the plots with passive compared to active protection but the infestation density was 0.89 mating chambers per 1 dm2 regardless of the protection status. In the third year (2016), most of the remaining living spruces had been infested with a mean density of 0.82 m.ch. per 1 dm2. In 2015, the proportion of females in the beetle population was 65.8% being higher in the active (68.4%) than the passive (64.0%) protection zone, while in 2016 the proportion was 63.5% and in this case slightly higher in the passive protection zone (63.9% as compared to 63.2%). These results are in accordance with patterns observed in wind-damaged Norway spruce stands of other areas in Poland and Europe and demonstrate the usefulness of forest management procedures in mitigating I. typographus outbreaks.
Źródło:
Leśne Prace Badawcze; 2017, 78, 2
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametry populacyjne pokolen pryszczarka kapustnika [Dasyneura brassicae Winn.] na rzepaku ozimym
Autorzy:
Kelm, M
Kaczmarzyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/834068.pdf
Data publikacji:
2003
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
Dasyneura brassicae
dynamika populacji
rosliny oleiste
owady
ochrona roslin
pryszczarek kapustnik
rozmieszczenie przestrzenne
rzepak ozimy
population dynamics
oil plant
insect
plant protection
brassica pod midge
spatial distribution
winter rape
Źródło:
Rośliny Oleiste - Oilseed Crops; 2003, 24, 1; 173-182
1233-8273
Pojawia się w:
Rośliny Oleiste - Oilseed Crops
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revisiting the Logistic Growth with Random Disturbances
Ponowna analiza modelu logistycznego z losowymi skokami
Autorzy:
Klimasara, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/953278.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
population dynamics
logistic growth
ecological modeling
savanna
savanna question
stationary density
piecewise deterministic markov processe
dynamika populacyjna
równanie logistyczne
modelowanie ekosystemów
sawanna
gęstość stacjonarna
kawałkami deterministyczne procesy Markova
Opis:
Modele populacyjne oparte o równanie logistyczne wziaz sa popularne w modelowaniu ekosytemów i pozwalaja lepiej zrozumiec rózne zjawiska. W tym artykule rozwazamy prosty 1-wymiarowy model sawanny zaproponowany przez D’Odorico, Laio i Ridolfi’ego w pracy [5], który jest modelem współistnienia traw i drzew na sawannach indukowanego losowymi pozarami. Jednak zamiast wprowadzac ubytki biomasy spowodowane wystepowaniem pozarów bezposrednio do równan modelu, definiujemy odpowiedni proces stochastyczny. Nastepnie badamy go z wykorzystaniem teorii półgrup stochastycznych. Zasadniczym wynikiem jest twierdzenie 3.1 okreslajace, kiedy przedstawiony model moze opisywac stabilne współistnienie traw i drzew charakterystyczne dla sawann. Mianowicie przy spełnionym warunku (7) istnieje jedyny absolutnie ciagły rozkład stacjonarny biomasy drzew, do którego cały układ bedzie dazył, natomiast w sytuacji (8) taki rozkład nie istnieje. Powyzszy wynik mozna łatwo przeniesc na wyzsze wymiary i zastosowac np. w dwuwymiarowym modelu podanym w poprzedniej pracy (na ten temat) autora i Marty Tyran-Kaminskiej [7].
The logistic growth population model still can help explain ecological phenomena. We consider a simple 1-dimensional model of savanna introduced by D’Odorico, Laio, and Ridolfi [A probabilistic analysis of fire-induced tree-grass coexistence in savannas. The American Naturalist 167, 2006] which is in fact a model of tree-grass coexistence driven by stochastic fire. We provide an appropriate stochastic process for this model and study it using the stochastic semigroup theory. Finally, we give the condition inducing the existence of a unique stationary distribution of woody biomass.
Źródło:
Mathematica Applicanda; 2019, 47, 2
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ zmian temperatury i wilgotności na cykle rozwojowe i znaczenie owadów w ekosystemach leśnych w związku z prawdopodobnymi zmianami klimatycznymi
The effect of temperature and humidity changes on insects development their impact on forest ecosystems in the context of expected climate change
Autorzy:
Jaworski, T.
Hilszczański, J.
Powiązania:
https://bibliotekanauki.pl/articles/1317794.pdf
Data publikacji:
2013
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
zmiany klimatyczne
zmiany temperatury
zmiany wilgotnosci
oddzialywanie na zwierzeta
owady
cykl rozwojowy
dynamika populacji
znaczenie ekologiczne
ekosystemy lesne
global warming
forest insects
population dynamics
forest insects outbreaks
range shift
phenology
forest management
Opis:
Ongoing climate change is mainly evident as increased in average temperature. It is expected to have a significant impact on world's biomes, with forest ecosystems especially vulnerable to these changes. The effect of climate change on forests is both indirect, through its impact on various tree species of different ecological requirements, and direct, through its impact on all living components of the forest ecosystem. Among the latter, insects are the group of the greatest importance, including species detrimental to forest health. The impact of climate change on forest insects may be reflected in their distribution, phenology, activity, number of generations and, indirectly, through impact on their natural enemies. Predicting the future direction and pace of the climate change, as well as direct and indirect consequences of its effect on forest insects is difficult and often subject to considerable inaccuracy. The paper presents a review of data from the published literature in this area of study. The influence of the basic climate parameters, temperature and humidity, on forest herbivore insects is discussed, particularly in the context of the most probable scenarios of climate change, i.e. the gradual increase in the average temperature. Observed and projected impacts of climate change in relation to the influence of herbivorous insects on forest ecosystems are characterized. We present some of the possible adaptation strategies of forest management to the expected climate changes.
Źródło:
Leśne Prace Badawcze; 2013, 74, 4; 345-355
1732-9442
2082-8926
Pojawia się w:
Leśne Prace Badawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wieloletnia dynamika starodrzewów w zagospodarowanej części Puszczy Białowieskiej: gatunki ekspansywne i ustępujące
Long-term dynamics of old-growth stands in the managed part of the Bialowieza Forest: increasing and declining tree species
Autorzy:
Drozdowski, S.
Brzeziecki, B.
Żybura, H.
Żybura, B.
Gawron, L.
Buraczyk, W.
Zajączkowski, J.
Bolibok, L.
Szeligowski, H.
Bielak, K.
Widawska, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1008501.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Bialowieska
starodrzew
dynamika drzewostanu
drzewa lesne
swierk
grab
jesion
olsza
dab
lipa
brzoza
klon
sosna
wiaz
zageszczenie drzew
piersnicowe pole przekroju
piersnice drzew
gatunki ekspansywne
gatunki ustepujace
stale powierzchnie obserwacyjne
badania dlugoterminowe
old−growth forest
permanent plot
long−term trend
population density
population dynamics
tree species
Opis:
In the paper, an assessment of tree population dynamics in the old−growth stands of the managed part of the Białowieża Forest is presented. Data from five permanent sample plots with a total size of 9.3 ha and six inventories that cover the period 1949−2006, were used. Depending on the dynamic status, determined on the basis of changes in a number of individuals per hectare, basal area and quadratic mean diameter, three major groups of tree species were distinguished: 1) an increasing group, containing only hornbeam and lime; 2) a stable group, involving alder and spruce and 3) a declining group consisting of oak, ash, maple, pine, birch, elm and aspen.
Źródło:
Sylwan; 2012, 156, 09; 663-671
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Demographic revitalization of belarusian towns in the XXI century
Autorzy:
Antipova, Ekaterina
Fakeyeva, Liudmila
Powiązania:
https://bibliotekanauki.pl/articles/447501.pdf
Data publikacji:
2013-03
Wydawca:
Instytut Rozwoju Miast
Tematy:
Belarus
urban population
factors of demographic dynamics
demographic revitalization
Opis:
The modern dynamics of the urban population of Belarus differs from the total population dynamics trend. The total population size of Belarus decreased from 10.1 to 9.5 million or 6%, in the period from 1989 to 2009 years. The urban population increased from 6.2 to 6.7 million, or 8.2% in the same space of time. Groups of towns by population size differ in the character of population dynamics. Population growth is typical for small towns, because of administrative reforms – some urban-type settlements get status of town. The population of small towns has increased by 17.5% during the period of 1989-2009 years, large and medium cities – by 7% an average. Natural movement indicators of the urban population of Belar us have significant differentiation between classes of towns by population size. During the period of 1989-2009 years the highest birth and mortality rates were established in the small towns. The highest birth and the lowest mortality rates are typical for large cities. Higher values of fertility rates in large cities determines by higher level of socio-economic development and the continued migration to cities the XXI century. The higher fertility rates in small towns are due to two factors: the state-support of small business in this group of settlements and attracting young professionals to new enterprises in small towns. Natural increase of population is manifested in all classes of towns in Belarus during the period 1989-2010 years. The highest rates of natural increase are typical for large cities with population size over 100 thousand people. In general, the demographic revitalization is obtained in 46% of towns in Belarus. This process is based on the factors of natural and migratory population movement. Population is growing due to natural increase and migration inflow with an absolute predominance in the structure of migratory factor in every fifth town (21%). In 17 towns (15%) population is increasing due to the predominance of one positive factor with negative value of the second (Natural increase > Migratory outflow, Natural decrease < Migratory inflow). Population decline with the dominant role of migratory losses is typical for 64% of towns in Belarus (mainly small and medium).
Źródło:
Problemy Rozwoju Miast; 2013, 1; 113-122
1733-2435
Pojawia się w:
Problemy Rozwoju Miast
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zagrożone gatunki drzew Białowieskiego Parku Narodowego (Rezerwat Ścisły)
Threatened tree species of the Bialowieza National Park (the Strict Reserve)
Autorzy:
Brzeziecki, B.
Keczyński, A.
Zajączkowski, J.
Drozdowski, S.
Gawron, L.
Buraczyk, W.
Bielak, K.
Szeligowski, H.
Dzwonkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1007075.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
hodowla lasu
Bialowieski Park Narodowy
rezerwaty scisle
Obreb Ochronny Orlowka
stale powierzchnie obserwacyjne
sklad gatunkowy
drzewa lesne
grab
lipa
swierk
olsza
brzoza
dab
sosna
jesion
klon
wiaz
topola osika
zageszczenie populacji
liczebnosc
struktura grubosci
gatunki dominujace
gatunki zagrozone
diameter distribution
dynamic status
large−scale inventory
long−term trend
natural forest
permanent plot
population density
population dynamics
strict protection
Opis:
An assessment of the current dynamic status of tree species occurring in the Strict Reserve of the Białowieża National Park is presented. On the basis of long−term trends and analysis of large−scale inventory data, the three major groups of trees are distinguished: 1) ‘safe’ group, containing hornbeam and lime, 2) ‘presently safe, but declining in a long−term run’ group, involving spruce, birch and alder, and 3) ‘threatened and highly threatened’ group, consisting of oak, pine, ash, maple, elm and aspen.
Źródło:
Sylwan; 2012, 156, 04; 252-261
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczenie początkowej liczebności „ludzkości współczesnej” i modelowanie dynamiki jej przejścia demograficznego
Determination of initial size of “modern humanity” and modeling of dynamics of its demographic transition
Autorzy:
Jabłecki, R.
Zinkovskyy, V. G.
Zhuk, O. V.
Zhuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/127414.pdf
Data publikacji:
2014
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
dynamika liczebności ludzkiej
portret fazowy
liczebność początkowa ludzkości
przejście demograficzne
dynamics of human population
phase portrait
initial size of humanity
demographic transition
Opis:
Przedstawiono analizę szeregu wcześniej stosowanych modeli logistycznych, potęgowych itd., opisujących dynamikę liczebności populacji ludzkiej. Zaproponowane w pracy metody analizy matematycznej pozwoliły na modelowanie dynamiki przejścia demograficznego populacji ludzkiej w zakresie liczebności od 0,3 do 7 mld i określenie początkowej liczebności ludzkości oraz portretu fazowego procesu.
A number of previously used logistic, n-power and other models describing the dynamics of the human population were analyzed. The proposed methods of mathematical modeling allowed to describe demographic transition dynamics of the human population in terms of its size from 0.3 to 7 billion, and determine the initial numbers of humanity and the phase portrait of that process.
Źródło:
Proceedings of ECOpole; 2014, 8, 2; 519-527
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parasites of chaffinch [Fringilla coelebs] population. Part 2. Blood parasites
Autorzy:
Pawelczyk, A
Gryczynska, A.
Mazgajski, T.D.
Powiązania:
https://bibliotekanauki.pl/articles/841547.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
Fringilla coelebs
chaffinch
parasitic infection
Haemoproteus
blood parasite
population
seasonal dynamics
Opis:
Blood parasites of Chaffinches caught from June to October near Łuknajno Lake (Mazurian Lakeland) were studied. Only parasites belonging to the genera Haemoproteus were found. A decrease in prevalence as the season progressed was observed. No differences in blood parasite infections in relation to the sex of the birds were found. Also males body weight was not affected by the presence of parasites.
Źródło:
Annals of Parasitology; 2003, 49, 1
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parasites of chaffinch [Fringilla coelebs] population. Part 2. Blood parasites
Autorzy:
Pawełczyk, A.
Gryczyńska, A.
Mazgajski, T.D.
Powiązania:
https://bibliotekanauki.pl/articles/2147618.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
Fringilla coelebs
chaffinch
parasitic infection
Haemoproteus
blood parasite
population
seasonal dynamics
Opis:
Blood parasites of Chaffinches caught from June to October near Łuknajno Lake (Mazurian Lakeland) were studied. Only parasites belonging to the genera Haemoproteus were found. A decrease in prevalence as the season progressed was observed. No differences in blood parasite infections in relation to the sex of the birds were found. Also males body weight was not affected by the presence of parasites.
Źródło:
Wiadomości Parazytologiczne; 2003, 49, 1; 31-38
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Temperature on the Properties of Cellulose Iβ based on Molecular Dynamics Simulations
Autorzy:
Huang, Shuang
Wu, Xin
Li, Peixing
Powiązania:
https://bibliotekanauki.pl/articles/2056296.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
cellulose Iβ
molecular dynamics simulation
Mulliken population
movement of chain
hydrogen bond
Opis:
Natural plants, such as cotton and linen, are rich in cellulose Iβ. The properties of cellulose Iβ under different temperatures was studied using molecular dynamics simulations. Firstly, the crystal of cellulose Iβ was built. To verify the model, the X-ray fibre diffraction and thermal expansion coefficients were calculated, which were found to agree with experimental results. Then the Mulliken population of the bonds were computed and the movement of the centre chain and hydrogen bonds studied over the range 300-550 K using a PCFF force field. The results of the Mulliken population reveal the three steps of pyrolysis. The higher the temperature is, the more intensely the movement of the centre chain is. However, the impact of temperature on the movement of the centre chain is not obvious. From 300 K to 550 K, the total number of hydrogen bonds decreased by only 20%. Moreocer, the rupture of intrachain hydrogen bonds and the formation of interchain hydrogen bonds at 400 K~450 K temperature occurred.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 6 (150); 32--36
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Russians in Ukraine – geodemographic dynamics of the post-Soviet period (results and perspectives)
Autorzy:
Sushchiy, Sergey
Powiązania:
https://bibliotekanauki.pl/articles/1199339.pdf
Data publikacji:
2018-05-31
Wydawca:
Uniwersytet Gdański. Instytut Geografii
Tematy:
Russian population of Ukraine
demographical dynamics
biological and ethnic community
middle term forecast
outward migration flow
assimilation
Opis:
The article studies quantitative and spatial dynamics of the Russian speaking population of the post soviet Ukraine. The factors accelerating the demographic shrinkage of the Russians of the country by 3 million people during 1989–2001 are analyzed. On the basis of a comparative analysis of the results of the 2001 Ukrainian census and the data of the ethnic and linguistic surveys of the Ukrainian population the conclusion is drawn that the core role in a prompt reduction of the number of the Russians belong to the assimilation. The analysis of the dynamic trends of the last several years allows affirming that within the borders of the modern Ukraine without the Crimea and the Donbas which is politically independent from Kyiv there may live about 4.1–4.5 million Russians. The study of eventual middle term prospects prove that by 2030 the given  number may reduce to 3.3–3.7 million people. The important role in this process will play all three factors of the number dynamics: natural decline, outward migration flow, assimilation. But the core role in the demographic shrinkage of the Russian community belongs to the assimilation or the transition from the Russian to the Ukrainian self-identity of a part of the biological and ethnic community of Ukraine. However the number of the Russians in the country recorded by all ensuing censuses of the population was lower than the real ethnic and cultural presence of the “Russian world” in Ukraine as the above mentioned identity transfer was not accompanied by an acculturation. The Russian language and culture not only dominate in the Russian environment but also keep a weighty role within the dominant country group. Only by prolongation of several decades of tough of a severe anti-Russian course Ukraine is capable of undermining the social and cultural potential of the Russian world.
Źródło:
Journal of Geography, Politics and Society; 2018, 8, 2; 26-32
2084-0497
2451-2249
Pojawia się w:
Journal of Geography, Politics and Society
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamika procesu starzenia się ludności w Polsce. Ocena z wykorzystaniem metod strukturalno-geograficznych
Dynamics of population ageing processes in Poland. The analysis using structural-geographical methods
Autorzy:
Antczak, Elżbieta
Lewandowska-Gwarda, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/414543.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warszawski. Instytut Ameryk i Europy. Centrum Europejskich Studiów Regionalnych i Lokalnych (EUROREG)
Tematy:
starzenie się ludności
analiza strukturalno-geograficzna
dynamika procesu
polskie podregiony
population ageing
dynamics
structural and geographical analysis
Polish subregions
Opis:
Celem artykułu jest wielowymiarowa analiza dynamiki procesu starzenia się ludności w Polsce. Realizacja celu wymaga implementacji odpowiedniego narzędzia badawczego, jakim jest rekurencyjna strukturalno-geograficzna metoda przesunięć udziałów. Badanie przeprowadzono na podstawie danych statystycznych dotyczących liczby osób w wieku 65 lat i więcej w przeliczeniu na 1 tys. mieszkańców w 72 podregionach Polski, w latach 2003–2016. W analizach wzięto również pod uwagę strukturę ludności według płci oraz miejsce zamieszkania – miasto, wieś. Tym samym dokonano obszernej analizy tempa zmian wielkości zjawiska. Na podstawie uzyskanych wyników wskazano obszary w Polsce charakteryzujące się najszybszą dynamiką starzenia się ludności oraz określono regionalne (geograficzne, przestrzenne), lokalne, przekrojowe (strukturalne) oraz sektorowe czynniki tych zmian.
The article offers a multidimensional analysis of the dynamics of population ageing in Poland. To this end, the spatial dynamic shift-share method is used. The data used in the analysis include the number of people aged 65 or over per 1,000 population, based on the criteria of sex and place of residence (urban or rural areas) in 72 Polish subregions in the period from 2003 to 2016. The study analyses the pace of changes in the scale of the phenomenon and identifies structural and local factors underpinning the net effect in specific subregions. In effect, subregions with the greatest pace of change and its underpinning factors are identified.
Źródło:
Studia Regionalne i Lokalne; 2018, 4(74); 89-110
1509-4995
Pojawia się w:
Studia Regionalne i Lokalne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure and abundance dynamics of amphibian communities in the farmland of Insko Landscape Park (Pomeranian Lakeland)
Strukura i dynamika liczebności zespołu płazów krajobrazu rolniczego Ińskiego Parku Krajobrazowego (Pojezierze Zachodniopomorskie)
Autorzy:
Michonski, G.
Wysocki, D.
Sadanowicz, P.
Sawicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/841773.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
population structure
abundance dynamics
amphibian community
farmland
Insko Landscape Park
Pomeranian Lake District
Triturus cristatus
Bombina bombina
Bufo calamita
Opis:
The paper presents results of a study conducted in Ińsko Landscape Park in the years 2002 and 2003. The study has confirmed the occurrence of 11 amphibian species, which coincides with results obtained previously by other researchers. The presence of two amphibian species from the “Red List of Threatened Species in Poland”, namely Triturus cristatus and Bombina bombina has been confirmed. Another important result of the study is the confirmation of the occurrence of Bufo calamita in the studied area. Finally, the paper presents the dynamics of occurrence of selected species.
W artykule zaprezentowano wyniki badań płazów krajobrazu rolniczego na wybranym terenie Ińskiego Parku Krajobrazowego w latach 2002 i 2003. Stwierdzono występowanie na tym terenie 11 gatunków płazów, w tym 2 gatunki – Triturus cristatus i Bombina bombina – figurujące na „Czerwonej liście gatunków zagrożonych w Polsce”. Dla wybranych gatunków przedstawiono dynamikę liczebności w okresie godowym.
Źródło:
Zeszyty Naukowe Uniwersytetu Szczecińskiego. Acta Biologica; 2012, 19
1230-3976
Pojawia się w:
Zeszyty Naukowe Uniwersytetu Szczecińskiego. Acta Biologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring methods and prognosis of Opomyza florum Fabr. (Diptera: Opomyzidae) - a pest of wheat in Bulgaria
Autorzy:
Krusteva, H.
Karadjova, O.
Ventislavov, V.
Powiązania:
https://bibliotekanauki.pl/articles/66272.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
monitoring method
prognosis
Opomyza florum
Diptera
Opomyzidae
pest
plant pest
yellow wheat fly
wheat
winter wheat
population density
dynamics
sowing date
Bulgaria
Opis:
The effect of sowing dates on the abundance of Opomyza florum, and the effect of sowing dates on the degree of larvae damage on winter wheat during the 2003-2008 time period was evaluated. The population density of O. florum adults and the damage larvae caused, were higher in the wheat fields sown in the last decade of September and the first half of October. Fields sown during the first decade of November were not infested by O. florum. A significant correlation between the mean temperature during the flight period and the maximum density of O. florum flies within each sowing (r = 0.94; p = 0.016) was established. The percentage of damaged shoots strongly corresponded to the maximum abundance of flies (r = 0.96; p = 0.01). The corresponding figures can be used for prognostic purposes. An adult observation accuracy below 25% was achieved by the sweep net method using 10 samples of 30 sweeps in the beginning of migration and 10 samples of 20 sweeps during the period of the O. florum mass flight. No marginal effect of adults was observed.
Źródło:
Journal of Plant Protection Research; 2012, 52, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decadal fluctuations in North Atlantic water inflow in the North Sea between 1958-2003: impacts on temperature and phytoplankton populations
Autorzy:
Leterme, S.C.
Pingree, R.D.
Skogen, M.D.
Seuront, L.
Reid, P.C.
Attrill, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/48966.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
phytoplankton
continental slope
ocean circulation
plankton
Atlantic water
plankton community
climate
temperature
dynamics
fluctuation
pelagic ecosystem
North Sea
circulation
population
sea surface temperature
Opis:
The circulation of Atlantic water along the European continental slope, in particular the inflow into the North Sea, influences North Sea water characteristics with consequent changes in the environment affecting plankton community dynamics. The long-term effect of fluctuating oceanographic conditions on the North Sea pelagic ecosystem is assessed. It is shown that (i) there are similar regime shifts in the inflow through the northern North Sea and in Sea Surface Temperature, (ii) long-term phytoplankton trends are influenced by the inflow only in some North Sea regions, and (iii) the spatial variability in chemicophysical and biological parameters highlight the influence of smaller scale processes.
Źródło:
Oceanologia; 2008, 50, 1; 59-72
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of water mass dynamics on the changes of invertebrates number in Lake Gardno
Wpływ dynamiki mas wodnych na zmiany liczebności bezkręgowców jeziora Gardno
Autorzy:
Paturej, E.
Jablonska, I.
Powiązania:
https://bibliotekanauki.pl/articles/85027.pdf
Data publikacji:
1999
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
water mass dynamics
invertebrates number
population change
Lake Gardno
zooplankton
zoobenthos
coastal lake
lake
abiotic factor
Rotatoria
Cladocera
Copepoda
Chironomidae
Oligochaeta
Gastropoda
Bivalvia
Trichoptera
Amphipoda
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1999, 03
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomass dynamics of fishing in estuarine lakes Lebsko and Sarbsko
Dynamika biomasy ryb w połowach rybackich z estuariowych jezior Łebsko i Sarbsko
Autorzy:
Orzechowski, B.
Obolewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/85029.pdf
Data publikacji:
2008
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
biomass dynamics
fishing
estuarine lake
Lake Lebsko
Lake Sarbsko
catchment area
mass dominance
fish
animal species
pike perch
perch
animal population
exploitation
spawning period
morphometric characteristics
Opis:
The research has shown the domination of fluctuative trends in the biomass dynamics for a major-ity of the caught fish species and decrease in the stocks of littoral phytophil fish. The main reason of the fishery breakdown of the pike perch in Łebsko and perch in Sarbsko was exploitation at a too big scale. The resources of the mentioned fish populations were drastically violated in the first decade of the 47 years of exploitation, that is in the years: 1952-1999. However, the highest fishing level of most of the fish species in annual cycles was achieved notoriously at spawning pe-riods during the whole 47 years. It just goes to show a complete ignorance of valid periods and the protective dimensions in the fishery practice. In the consecutive decades and for all the 47 years, the position and the degree of mass dominance for separate species of fish in fishing have been es-tablished. Pairs of superdominants and eudominants with the greatest quantitative participation in fishing have been distinguished for each of the lake. For the regeneration of the pike’s, the tench’ and the crucian carp’ population fishing of those species should be banned for the time of their generation. Reduction to small Cyprynidae species should be conducted by intensive stock in Łebsko with the pike and in Sarbsko with the pike-perch.
W pracy wykazano przewagę trendów fluktuacyjnych w dynamice biomasy większości poławianych gatunków ryb i wygasanie połowów fitofilnych ryb litoralowych. Główną przyczyną załamania się połowów sandacza w Łebsku oraz okonia w Sarbsku był brak prawidłowej gospodarki rybackiej. Zasoby wymienionych populacji ryb naruszano drastycznie już od pierwszej dekady blisko 50-letniej eksploatacji. Szczytowe połowy większości ryb w cyklu rocznym były osiągane głównie w okresie tarła przez cały analizowany okres. Dla odrodzenia się populacji szczupaka, lina oraz karasia należy całkowicie zaniechać ich połowów na czas trwania generacji i zredukować drobne karpiowate poprzez przeprowadzenie intensywnego zarybiania jezior szczupakiem i sandaczem.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2008, 12
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal dynamics of: the pea aphid, Acyrthosiphon pisum (Harris), its natural enemies the seven spotted lady beetle Coccinella septempunctata Linnaeus and variegated lady beetle Hippodamia variegata Goeze, and their parasitoid Dinocampus coccinellae (Schrank)
Autorzy:
Soleimani, S.
Madadi, H.
Powiązania:
https://bibliotekanauki.pl/articles/66261.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
seasonal dynamics
pea aphid
Acyrthosiphon pisum
natural enemy
lady beetle zob.ladybird
ladybug zob.ladybird
ladybird
ladybird beetle zob.ladybird
Coccinella septempunctata
variegated lady beetle
Hippodamia variegata
parasitoid
Dinocampus coccinellae
population fluctuation
Opis:
Two important lady beetle species commonly found in alfalfa fields in Iran are the variegated lady beetle Hippodamia variegata Goeze and the seven spotted lady beetle Coccinella septempunctata (Linnaeus, 1758) (Coleoptera: Coccinellidae). These two species attack many aphid species including the pea aphid, Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae). In this study, the seasonal population changes of A. pisum, H. variegata, C. septempunctata and the parasitoid, Dinocampus coccinellae (Schrank) (Hymenoptera: Braconidae) were studied in alfalfa fields in the 2012 and 2013 seasonal periods. The highest ladybird densities were noted on July 5, 2012 and on September 6, 2013 (17.2±2.8 and 13.4±1.6) individuals per 20 sweeps, respectively. Parasitism rates by D. coccinellae ranged from approximately 3 to 6% in two subsequent years, respectively. Parasitism was higher early in the growing season. Most parasitised ladybirds were females. There was no significant relationship between the temperature and relative humidity with pea aphid populations, although the aphid populations declined during the hot summer period. In contrast, the relationship between temperature and the H. variegata population was significant and positive in both years of the study. It has been shown that these lady beetle species have a major role in reducing the pea aphid populations in alfalfa fields. Due to the relatively low percentage of field parasitism by D. coccinellae, this parasite might not reduce the biocontrol efficiency of lady beetle species.
Źródło:
Journal of Plant Protection Research; 2015, 55, 4
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-75 z 75

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies