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Wyświetlanie 1-15 z 43
Tytuł:
The genus Oschmarinolepis Spassky et Spasskaja, 1954 (Cestoda, Cyclophyllidea), history of studying, and the most recent species structure
Autorzy:
Kornyushin, V.
Greben, O.
Mariaux, J.
Powiązania:
https://bibliotekanauki.pl/articles/6103.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
Oschmarinolepis
cestode
Oschmarinolepis microcephala
parasite
Cestoda
Cyclophyllidea
species structure
Źródło:
Annals of Parasitology; 2016, 62, Suppl.
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implication of forest zonation on tree species composition, diversity and structure in Mabira Forest, Uganda
Autorzy:
Weldemariam, E.C.
Jakisa, E.S.
Ahebwe, D.A.
Powiązania:
https://bibliotekanauki.pl/articles/9997.pdf
Data publikacji:
2017
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
forest zonation
management zone
tree
woody species
plant species
species composition
species diversity
species structure
Mabira Forest Reserve
Uganda
Opis:
The study aimed to investigate effectiveness of forest management zoning in conserving biodiversity of Mabira forest reserve. The study sites buffer, production, and strict nature reserve management zones were purposively selected. This was undertaken through investigating woody species diversity, composition and structure. A total of 60 sampling plots with a size of 20 m x10 m were used to collect vegetation data. Variables such as woody plant species identification and counts as well as diameter at breast height (DBH) of trees were done. The result depicted a total of 65 woody species; 39 in buffer, 19 in productions and 37 in strict nature reserve. Of these, only 9 trees species were found common to all zones and their Sorensen similarity coefficient was 0.2213. The population structure of the buffer and strict nature reserve zones was found to be a J - shape pattern, whereas the production zone shown an inverted J-shape pattern. Higher woody species diversity was depicted in the buffer and strict nature zones with (H’=2. 73512) and (H’=2. 68412) respectively, and lower in a production zone (H’=1. 63628). The evenness index value of a buffer zone was (J =0. 746574), strict nature (J= 0.743335) and production (J=0. 555719). The production zone had shown higher IVI values followed by buffer and strict nature reserve zone. The most important woody species identified based on their IVI value were Broussonetia papyrifera (Production), Acalypha neptunica (Buffer), Funtumia Elastica (strict nature reserve). The existing forest management is effective in conserving the biodiversity of the forest reserve. Nevertheless, the production zone was still suffering from exploitation of the surrounding community, hence serve for protecting the remaining management zones from further human interference. Further investigation is also required on the adjacent community perceptions of the forest management zoning.
Źródło:
Environment, Earth and Ecology; 2017, 1, 1
2543-9774
2451-4225
Pojawia się w:
Environment, Earth and Ecology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fish biomass and species composition in the Malta Reservoir, Poland
Biomasa i struktura gatunkowa ichtiofauny Zbiornika Maltańskiego
Autorzy:
Andrzejewski, W.
Szlakowski, J.
Mastyński., J.
Mazurkiewicz, J.
Godlewska, M.
Powiązania:
https://bibliotekanauki.pl/articles/293014.pdf
Data publikacji:
2010
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
ichtiofauna
struktura gatunkowa
zagęszczenie biomasy
Zbiornik Maltański
biomass estimates
ichthyofauna
Malta Reservoir
species structure
Opis:
In the Malta Reservoir a total of 16 fish species belonging to six families were recorded in 2008. In the Nordic multi-mesh gillnets 4528 fish belonging to 11 species, with the total weight of 149.5 kg, were caught. The total beach seine catch was 34348.9 kg, which in terms of the reservoir area of 64 ha amounted to biomass density 536.7 kg·ha-¹. Of 11 species caught with the beach seine roach (Rutilus rutilus) was the most abundant species (485031 fish, 7578 individuals·ha-¹) with the highest share in biomass (24283.4 kg, 70.7%). The average electric catch at two sampling sites in the Cybina River running in the reservoir bowl was 105 kg (which gave estimate of 2.6 ton in all), with a marked dominance of the roach, which constituted 65.4% of fish catch in weight and 93% in numbers. Taking under consideration the results of electrofishing the estimated fish density in the Malta Reservoir in 2008 could reach as much as 577.7 kg·ha-¹. The proportion of predatory fish in the fish assemblage biomass was 20.1%.
Badania ichtiofauny w Zbiorniku Maltańskim przeprowadzono w 2008 r. w trzech etapach: (1) we wrześniu i w październiku z wykorzystaniem palenowych wontonów badawczych (Nordic gillnets); (2) w październiku i listopadzie w trakcie kolejnego odwodnienia zbiornika ryby były odławiane przez brygadę rybacką za pomocą przywłoki; (3) w listopadzie, po całkowitym odwodnieniu zbiornika, na dwóch stanowiskach w korycie Cybiny, biegnącym w czaszy zbiornika przeprowadzono elektropołowy. W trakcie badań każdorazowo oznaczano gatunki ryb, ich liczbę i masę. W Zbiorniku Maltańskim w 2008 r. stwierdzono występowanie 16 gatunków ryb, należących do sześciu rodzin. W wontony nordyckie złowiono 4528 sztuk ryb, należących do 11 gatunków, o łącznej masie 149,5 kg. Udział płoci, gatunku dominującego w tych połowach, wyniósł 64,5% liczebności połowu i 38,8% jego masy. Udział kolejnych dwóch gatunków, tj. okonia i jazgarza, wyniósł odpowiednio 16,8 i 11,5% liczebności oraz 25,8 i 4,5% masy. W odłowach przywłoką łącznie pozyskano 34 348,9 kg ryb, co w przeliczeniu na hektar powierzchni zbiornika, wyniosło 536,7 kg·ha-¹ (powierzchnia 64 ha). Dominantem pod względem liczebności (485 031 szt., 7578 szt.·ha-¹) i biomasy (24 283,4 kg, 70,7%) była płoć. Udział drugiego pod względem liczebności i biomasy okonia wyniósł 8,9% (3062,5 kg), a jego zagęszczenie wyniosło 1590 szt.·ha-¹. Masa ryb z elektropołowów w korycie Cybiny wynosiła średnio 105 kg. W połowach dominowała płoć, stanowiąc 93% liczebności i 65,4% jego masy. Udział okonia i sandacza wyniósł odpowiednio 3% i 0,6% liczebności oraz 4,7% i 27,8% masy. Zagęszczenie biomasy ichtiofauny Zbiornika Maltańskiego podczas całkowitego odwodnienia w 2008 r. wyniosło 536,7 kg·ha-¹, a po uwzględnieniu wyników elektropołowów - 577,7 kg·ha-¹. Było ono znacznie większe, w stosunku do średniej ze wszystkich dotychczasowych odwodnień (362,2 kg·ha-¹). Udział ryb drapieżnych w biomasie ichtiofauny wyniósł 20,1%, natomiast gatunków niedrapieżnych - 79,9%.
Źródło:
Journal of Water and Land Development; 2010, 14; 67-82
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An attempt to control natural focus of leptospirosis grippotyphosa by rodenticide - a long-term study [1977-2004]
Autorzy:
Bakoss, P
Jarekova, J.
Labuda, M.
Powiązania:
https://bibliotekanauki.pl/articles/50015.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Tematy:
public health
disease
economic problem
control
man
natural focus
species structure
animal
small mammal
leptospirosis
terrestrial mammal
rodenticide
Opis:
The purpose of the study was to suppress a known natural focus of fi eld fever exerting an infl uence on animal hosts of leptospires – small terrestrial mammals (s.t.m.) by rodenticide. After repeated application of the zinc phosphide rodenticide, the s.t.m. were regularly live-trapped and checked for leptospirosis by dark-fi eld microscopy and culture of their renal tissue and serological examination. Isolated leptospira strains were typed by help of rabbit factor sera. The deratization infl uenced the s.t.m. structure considerably: the proportion of the dominant Microtus arvalis subjects – the main reservoirs of Leptospira kirschneri serovar Grippotyphosa – were gradually and substantionally reduced and, contrarily, the percentage of the potetial hosts subjects – Clethrionomys glareolus and Apodemus fl avicollis – rose decisively over time. Changes in culture and serological positivity for leptospirosis of s.t.m. have also been enregistered. The highest original infestation of M. arvalis have slowly but strongly decreased while that of C. glareolus and A. fl avicollis has increased decisively and reached its maximum within the last years of investigation. It is probable that these two animal species have undertaken the leading role in the maintenance of the natural focus of the fi eld fever. In other animal species analogous trends were not registered. Based on these long-term fi ndings, there exists the possibility to suppress only partially and temporarily the epizootic process of leptospirosis in a natural focus that can be desirable in some circumstances (building or free time activities, etc.).
Źródło:
Annals of Agricultural and Environmental Medicine; 2007, 14, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roznorodnosc gatunkowa drzew i krzewow oraz ocena prawidlowosci ich doboru na terenie Elektrowni 'Szczecin'
Autorzy:
Lysko, A
Kiepas-Kokot, A.
Powiązania:
https://bibliotekanauki.pl/articles/795538.pdf
Data publikacji:
2006
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
zielen miejska
struktura gatunkowa
tereny przemyslowe
drzewa
Elektrownia Szczecin
krzewy
urban green
species structure
industrial area
tree
Szczecin Power Plant
shrub
Opis:
W niniejszej pracy scharakteryzowano strukturę gatunkową zieleni drzewiastej i krzewiastej na terenie Elektrowni „Szczecin”, ze wskazaniem na gatunki dobrze znoszące trudne warunki obszaru przemysłowego. W obszarze badań stwierdzono występowanie 58 gatunków i odmian drzew reprezentowanych przez 415 egzemplarzy oraz 49 gatunków i odmian krzewów, reprezentowanych przez 419 egzemplarzy. Wśród drzew i krzewów na tym terenie dominują liściaste, ze znaczącym udziałem (1/3) iglastych. Zieleń zakładowa mimo trudnych lokalnych warunków środowiskowych charakteryzuje się dobrym stanem zdrowotnym.
A typical structure of trees and shrubs in the area of „Szczecin” Power Plant with the indication of species well enduring hard industrial condition of this specific area is presented in this paper. In the studied area there were 58 species of trees represented by 415 individuals and 49 species of shrub represented by 419 individuals. Among all trees and shrubs species leafy species predominated, with a significant participation (1/3) of coniferous. In spite of hard local environmental conditions the industrial green of the „Szczecin” Power Plant was characterized by good health condition.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2006, 515; 267-272
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określenie składu gatunkowego lasów Góry Chojnik (Karkonoski Park Narodowy) z wykorzystaniem lotniczych danych hiperspektralnych APEX
Identification of tree species in Mt Chojnik (Karkonoski National Park) forest using airborne hyperspectal APEX data
Autorzy:
Raczko, E.
Zagajewski, B.
Ochtyra, A.
Jarocińska, A.
Marcinkowska-Ochtyra, A.
Dobrowolski, M.
Powiązania:
https://bibliotekanauki.pl/articles/989774.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Karkonoski Park Narodowy
gory
Chojnik
lasy
sklad gatunkowy
metody badan
teledetekcja
pomiary hiperspektralne
skaner APEX
svm classification
apex hyperspectral data
species structure
Opis:
We used hyperspectral data from APEX scanner (288 spectral bands in 380−2500 nm spectral range; 3,5 m spatial resolution) to classify five tree species occurring in the area of Mt. Chojnik in the Karkonoski National Park (south−western Poland). Data used to delimit learning and verification polygons were acquired during field research in August 2013, when ground truth polygons were acquired using device equipped with GPS receiver. Raw APEX data went through radiometric and geometric correction at VITO office. To reduce processing time, 40 most informative bands were selected using information content analysis. The Support Vector Machines (SVM) algorithm was used for classification of the following tree species: Fagus sylvatica L., Betula pendula Roth, Pinus sylvestris L., Picea alba L. Karst and Larix decidua Mill. Final classification had 78.66% overall accuracy with Kappa coefficient equal to 0.71. The best classified species included beech (87.09%) and pine (83.96%), while the worst results were obtained for larch (60.29%). Low accuracy for larch could be caused by the fact that most of larch trees in the research area grow in small patches, which made it hard to specify large enough sample of training data. All classified tree species had producer's accuracy of at least 60%, with the highest value reaching 87%. User's accuracies were from 53% for pine to 85% for beech. It is possible to classify tree species using hyperspectral data with moderate to high accuracy even if the data used lacked atmospheric correction. Further work will focus on improving the classification accuracy and use of neural networks based classification methods. Results from this paper will serve as basis for tree species map of the Karkonoski National Park.
Źródło:
Sylwan; 2015, 159, 07; 593-599
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sprzedaż drewna w nadleśnictwach Puszczy Białowieskiej w latach 2008-2015
Sale of timber in forest districts of the Bialowieza Forest in 2008-2015
Autorzy:
Lachowicz, H.
Zastocki, D.
Sadowski, J.
Moskalik, T.
Nietupska, M.
Powiązania:
https://bibliotekanauki.pl/articles/985928.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Bialowieska
gospodarka lesna
nadlesnictwa
Nadlesnictwo Bialowieza
Nadlesnictwo Browsk
Nadlesnictwo Hajnowka
surowce drzewne
drewno
sortymenty drewna
sprzedaz drewna
bialowieża forest
timber sales
assortment and species structure
Opis:
The structure of timber sales in forest districts of the Białowieża Forest in the years 2008−2015 is presented. The Białowieża Forest is one of the most valuable natural areas in Europe. The data from the reports generated by the State Forests Information System of the Hajnówka, Browsk and Białowieża forest districts were used for the research. The information contained in the forest management plans and nature conservation programs of the surveyed forest districts was also used. The volume of the sold merchantable timber in the Białowieża Forest amounted to 669,072 m3, of which 63.43% was softwood and 36.57% hardwood. Among the softwood assortment, sales of the large−sized timber amounted to 44.42%, while of the medium−sized timber to 55.58%. For the large−sized hardwood, the share of sales amounted to 30.66%, while for the medium−sized hardwood to 69.34%. The small−sized timber was sold at 22,389 m3, with the share of hardwood assortments being 82%, and of softwood 18%. A small share in the sales of small−sized timber is caused by the lack of FSC certification by forest districts, which excludes large industrial companies that buy predominantly the medium−sized coniferous timber assortments. The average price obtained from the sale of timber in the the Białowieża Forest in the analysed period was 134.7 PLN/m3. At a price higher than the average, wood was sold in the Białowieża and Hajnówka forest districts, while in the Browsk Forest District the timber was sold at a price lower than the average. The total volume of merchantable timber harvested in the forest districts of the Białowieża Forest in the analysed years, including the small−sized timber, amounted to 686,684 m3, with 691,461 m3 of timber being sold. The volume of the merchantable timber sold at that time was 669,072 m3, which constituted only 0.24% of the total timber sold at the State Forests in Poland.
Źródło:
Sylwan; 2018, 162, 11; 949-954
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozpad drzewostanów świerkowych w Beskidzie Żywieckim
Dieback of Norway spruce stands in the Beskid Zywiecki Mts.
Autorzy:
Dmyterko, E.
Bruchwald, A.
Mionskowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/979601.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Beskid Zywiecki
drzewostany swierkowe
rozpad drzewostanow
swierk pospolity
Picea abies
struktura drzewostanu
struktura wiekowa
struktura gatunkowa
pozyskiwanie drewna
struktura pozyskania
zagrozenia lasu
wiatry
szkody od wiatru
forest dieback
picea abies
species structure
age structure
timber harvest
threat to forests by wind
Opis:
In the Beskid Żywiecki, the combination of abiotic, biotic and anthropogenic factors unfavourable for the growth of trees led to the dieback of spruce stands. The intensification of this process began after the hurricane in November 2004, followed by years of negative climatic water balance. The deterioration of tree growth conditions occurred after the drought in July 2006 and damage caused by the Kyril hurricane in January 2007. The weakened spruces were attacked by the bark beetles, the outbreak of which caused a massive dieback of spruce stands. In order to assess the volume of harvested timber in years 2004−2016, the volume of allowable cut (model volume) was calculated from the stand growth model for each forest district of Beskid Żywiecki. The comparison of the volume of harvested timber with the model volume allowed to determine the rate of dieback of spruce stands. The volume of harvested timber in 2007−2009 exceeded the model volume even 2.5 times. The cuts included mainly deadwood, wind−broken and wind−fallen trees, while the harvest of live trees was scarce. In the period 2010−2013, the harvested volume of live trees accounted for 50−70% of the model volume, the volume of deadwood in the same period was ca. 100% and additionally the volume of blown−down timber after the hurricane was 20−40% of the model volume, which taken together accounted approximately to 200% of the model volume. The execution of such harvesting operations, including silvicultural tasks, did not allow to carry out optimal forest management. The period 2010−2013 saw a downward trend. It was disrupted by the hurricane in December 2013, after which the volume of harvested timber, consisting mainly of wind−broken and wind−fallen trees, increased to 280% of the model volume. Again, the high volume of harvested timber was noted in 2016, (ca. 220% of the model volume). The process of damage to spruce stands in Beskid Żywiecki is likely to continue. A decline in its intensity may occur in the absence of old stands, which to a large extent already takes place in the forests of the Węgierska Górka Forest District. Currently, the most threatened by wind are forests in Ujsoły, Jeleśnia and Nowy Targ forest districts. The least threatened are forests in the Węgierska Górka. This forest district and in the future the remaining forest districts of Beskid Żywiecki, will face enormous challenges to obtain high yield and appropriate species composition.
Źródło:
Sylwan; 2019, 163, 02; 130-140
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microspatial structure of the seed bank of xerothermic grassland - intracommunity differentiation
Autorzy:
Czarnecka, J
Powiązania:
https://bibliotekanauki.pl/articles/56952.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
microspatial structure
spatial structure
intracommunity differentiation
species diversity
seed bank
xerothermic grassland
Opis:
The study analyses the quantity and spatial structure of the seed bank of the xerothermic grassland located in the Biała Góra near Tomaszów Lubelski (Central Roztocze Region). The seed stock of the bank was compared with the vegetation found in two different patches of the examined grassland. The number of seeds per square meter was estimated at 5328 and 5355, depending on the patch. The seed bank's spatial organisation is clustered. The most important factors determining this spatial distribution are: remaining of the seeds in close vicinity of parent plants, and the "group" dispersal of the seeds and fruits.
Źródło:
Acta Societatis Botanicorum Poloniae; 2004, 73, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nectary structure in Symphyglossum sanguineum [Rchb.f.] Schltr. [Orchidaceae]
Autorzy:
Stpiczynska, M
Davies, K L
Powiązania:
https://bibliotekanauki.pl/articles/27228.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Symphyglossum sanguineum
ornithophilous orchid
Orchidaceae
orchid species
pollination
nectary structure
Opis:
Ornithophily occurs in a great number of orchid species but despite this, researchers have largely neglected to investigate their nectaries. The aim of this study is to describe the nectary structure of Symphyglossum sanguineum, a species presumed to be pollinated by hummingbirds. The nectary is located at the free margins of auricles, which form a channel for the passage of nectar. The nectary, which consists of a single-layered epidermis and 2-3 layers of subepidermal cells, is supplied by collateral, vascular bundles. The nectary cells of S. sanguineum, like those of other ornithophilous orchids, have thick cellulose cell walls. A remarkable feature of these nectary cells is the dissolution of the middle lamella and the subsequent separation of epidermal cells. It is possible that this latter process facilitates the flow of the nectar to the nectary surface. The cuticle covering the nectary epidermis has micro-channels, but unlike the other species of ornithophilous orchids studied to date, it neither becomes disrupted nor detached from the epidermal cells. Abundant mitochondria, lipid droplets and smooth endoplasmic reticulum (SER) with an osmiophilic material are present in the cytoplasm of nectary cells. Some plastids with few lamellae contain numerous vesicles and osmiophillic globules whereas others accumulate starch. SER lamellae are often closely associated with plastids and the contents of the former organelles closely resemble osmiophillic globules. Secretory vesicles are common, especially near the outer, tangential wall indicating that granulocrine secretion possibly occurs in S. sanguineum.
Ornitofilia występuje u wielu Orchidaceae, lecz nektarniki storczyków zapylanych przez ptaki rzadko są przedmiotem badań. Celem niniejszej pracy było zbadanie struktury nektarników Symphyglossum sanguineum, gatunku przypuszczalnie zapylanego przez kolibry. Nektarnik w kwiatach S. sanguineum znajduje się na wolnych krawędziach auriculi, które są wytworem warżki. Auricule tworzą kanal, przez który przesącza się nektar na powierzchnię labellum. Nektarnik zbudowany jest z jednowarstwowej epidermy i 2-3 warstw komórek subepidermalnych. Jest on zaopatrywany przez kolateralne wiązki przewodzące. Komórki nektarnika S. sanguineum mają grube celulozowe ściany komórkowe. Charakterystyczną cechą nektarnika jest rozpuszczenie blaszek środkowych w ścianach niektórych komórek epidermy wydzielniczej, co powoduje ich rozsunięcie. Przypuszczalnie proces ten ułatwia przesączanie się nektaru na powierzchnię nektarnika. Kutykula pokrywająca komórki epidermy wydzielniczej ma mikrokanaliki, lecz w przeciwieństwie do komórek nektarników innych dotąd badanych ornitofilnych storczyków, nie pęka ani też nie tworzy uwypukleń pod wpływem wydzielanego nektaru. Cytoplazma komórek wydzielniczych zawiera liczne mitochondria, krople lipidowe i gładkie retikulum endoplazmatyczne (SER) wypełnione osmofilnym materiałem. Niektóre plastydy w komórkach nektarnika mają nieliczne tylakoidy i pęcherzyki oraz osmofilne globule, podczas gdy w innych plastydach znajdują się ziarna skrobi. Błony SER są w kontakcie z plastydami, a osmofilny materiał zawarty w SER przypomina ciemno wybarwione globule w plastydach. Liczne pęcherzyki wydzielnicze w sąsiedztwie ściany komórkowej wskazują na możliwość sekrecji pęcherzykowej.
Źródło:
Acta Agrobotanica; 2006, 59, 1
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Can sexual behaviour serve to identify species? An example of two slugs of the genus Deroceras
Autorzy:
Czyz, M.
Reise, H.
Hutchinson, J.
Powiązania:
https://bibliotekanauki.pl/articles/84057.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
sexual behaviour
identify species
slug
Deroceras
morphology
genital structure
copulation
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First data of age, condition, growth rate and diet of invasive Neogobius melanostomus (Pallas, 1814) in the Pomeranian Bay, Poland
Autorzy:
Rybczyk, Agnieszka
Czerniejewski, Przemysław
Keszka, Sławomir
Janowicz, Mariola
Brysiewicz, Adam
Wawrzyniak, Wawrzyniec
Powiązania:
https://bibliotekanauki.pl/articles/1844420.pdf
Data publikacji:
2020
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
diet
fish alien species
Gobidae
growth rate
Pomeranian Bay
population structure
Opis:
Round goby (Neogobius melanostomus (Pallas, 1814)) is an invasive species in the Oder River. In this study, age of 147 fish was determined using scales and otoliths, and the Fraser-Lee back-calculation method was used for population structure and theoretical length growth rates with 3 mathematical models of growth: von Bertalanffy, Ford–Walford and 2nd degree polynomial. Fish condition was determined using Fulton, Le Cren and Clark equations. Average total length and weight of fish was 162.00 mm and 83.00 g, respectively. Males were more abundant than females, representing 70% of the fish caught, and achieved greater total lengths and weights. Age 2+ dominated females and 3+ males age groups. Of the three mathematical models used to estimate fish growth, the 2nd degree polynomial model had the best fit to back-calculated lengths. Males had slightly higher growth rates than females in the first two years of life but comparable in subsequent years. The diet consisted of various benthic organisms that varied with fish age. The most frequently occurring food component was Dreissena polymorpha, which accounted for approximately 70% in the diet of fish with a body length greater than 191 mm.
Źródło:
Journal of Water and Land Development; 2020, 47; 142-149
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temporal variation in species composition, diversity and regeneration status along altitudinal gradient and slope: The case of Chilimo dry Afromontane forest in the Central Highlands of Ethiopia
Autorzy:
Tesfaye, Mehari A.
Gardi, Oliver
Blaser, Jűrgen
Powiązania:
https://bibliotekanauki.pl/articles/1046543.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Abundance
Ethiopia
altitude gradient
native species
population structure
saplings
seedlings and shrubs
Opis:
This study is aimed towards investigating the temporal variation in species composition, diversity and regeneration status of Chilimo dry Afromontane forest in the Central Highlands of Ethiopia. A total of 35 permanent sample plots of 20 m × 20 m (400 m2) each were established in the natural forest, laid out on transects of altitudinal gradients, with a distance of 100m between plots. The plots were measured twice in 2012 and 2017. Three subplots, 5m × 5m, and 1 m2 were laid out inside the main plots for sapling, shrub and seedling data collection. Species composition, diversity, important value index (IVI) and regeneration data were analyzed using appropriate formulas. Data analysis was made using R - studio software. A total of 31 trees and shrubs representing 25 families were recorded, 20 (64.52 %) were trees and 11 (35.48 %) were shrubs. Thereof, 28, 23 and 26 species under highest, middle and lowest altitudinal gradient were recorded. The most dominant tree species were: Juniperus procera, Podocarpus falcatus, Olea europea, Scolopia theifolia and Allophyllus abyssinicus. The species composition, diversity, abundance, dominance and important value index significantly varied among species, altitudinal gradient and slope. The diameter distribution was an inverted J - shaped distribution pattern. The highest species richness and diversity index were found under middle altitudinal gradient, while the lowest species richness and diversity index were found under the highest altitudinal gradient. The mean annual volume increment ranged from 4.223 to 0.228 m3 ha-1 yr-1, while the basal area increment varied from 0.85 to 0.020 m2 ha-1 yr-1. Among the sampled species, ten species had fair, 5 poor and 14 species had no regeneration. In conclusion, the Chilimo dry Afromontane forest is suffering from low recruitment and regeneration. Thus, appropriate forest management options should be implemented.
Źródło:
World Scientific News; 2019, 138, 2; 192-224
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additional observations on the Jurassic belemnoids of Poland
Dodatkowe badania nad belemnitami jurajskimi w Polsce
Dopolnitel'nye issledovanija jurskikh belemnitov v Pol'she
Autorzy:
Pugaczewska, H.
Powiązania:
https://bibliotekanauki.pl/articles/22567.pdf
Data publikacji:
1965
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
Jurassic
belemnoid
Belemnopsis wiekensis
new species
Belemnopsinae
ontogenesis
structure
rostrum
Polska
Źródło:
Acta Palaeontologica Polonica; 1965, 10, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Body size, condition, growth rate and parasite fauna of the invasive Perccottus glenii (Actinopterygii: Odontobutidae) from small watercourse in the Vistula River basin, Poland
Autorzy:
Czerniejewski, Przemysław
Linowska, Angelika
Brysiewicz, Adam
Kasowska, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/293036.pdf
Data publikacji:
2020
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
age and growth
Amur sleeper
Habdziński Canal
invasive species
parasites
population structure
Opis:
For the last few decades there have been reports not only of the occurrence of new invasive species of European watercourses, but also their increasing expansion. One of such species is the Amur sleeper (Perccottus glenii). The present work contains assessment of age and length distribution, condition as well as growth rate and analysis of the parasite fauna of the Amur sleeper from the waters of the Vistula River tributary in its middle course (the Habdziński Canal). During the catch performed in 2017 and 2019, the total of 177 Amur sleepers were recorded in the studied watercourse and a statistically significant sex structure disproportion was observed. Among the specimens caught in 2017 dominant were fishes with lengths of 50.1–60.1 mm whereas in 2019 the majority of the Amur sleeper specimens measured 30.1–50.0 mm. Six age groups were recorded among the caught fish with a clear prevalence of specimens aged 1+ (70.06%). The most frequently recorded parasite of P. glenii was non-quantifiable Trichodina rostrata ciliate for which the Amur sleeper from the Polish waters appeared to be a new host. Moreover, the presence of an acanthocephalan Acanthocephalus lucii, not recorded in Poland in this host before, was observed in the chyme. Also, accidental presence of larvae of the Opisthioglyphe ranae tremadote, which is a parasite typical of amphibians, was also recorded. Despite unfavourable habitat conditions and increased volumes of biogenic substances in the waters of the Habdziński Canal, the Amur sleeper found convenient conditions to reside in this small watercourse.
Źródło:
Journal of Water and Land Development; 2020, 44; 33-42
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
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