Temat: Population Dynamics - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

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

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