Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 10

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  ecological niche
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Can ecological niches of unionids be defined?

100%
Cmiel A., Lipinska A.
Folia Malacologica
|
2016
|
tom 24
|
nr 1
2

Cell-free immune response in juvenile hormone JH-III treated Galleria mellonella larvae

75%
Zdybicka-Barabas A.
Acta Poloniae Toxicologica
|
1999
|
tom 07
|
nr 2
3

Niche dynamics and biodiversity: many rodent species on one marshy meadow

63%
Jancewicz E., Gliwicz J.
Polish Journal of Ecology
|
2017
|
tom 65
|
nr 4
The ecological niche of a species is determined by its tolerance to environmental factors and by interactions with other species, particularly those using the same resource. We assessed spatial niches of four rodent species coexisting in one meadow habitat within the Białowieża Primeval Forest. Niche characteristics were based on the valorisation of the habitat around live-trapping sites visited by rodents during seven years of the study. The population size of each species was monitored and expressed as an average annual density. The root vole Microtus oeconomus was the most numerous and dominant species, with its density widely fluctuating due to the temporal increases of predation pressure exerted by the weasel Mustela nivalis.During the study period, the spatial niche of the root vole was nearly constant, with only significantly increased tolerance towards shrub covered sites at times of its high population density. However, even a slight niche expansion of the highly abundant root voles displaced accompanying species: the bank vole Myodes (Clethrionomys) glareolus, the yellow necked mouse Apodemus flavicollis and the striped field mouse A. agrarius, from their preferred sites and efficiently decreased rodent species diversity in the studied habitat. This study illustrates a possible mechanism of the direct effect of predation on the dominant prey species population and indirect one on the species diversity changes over ecological time.
4

Habitat suitability, corridors and dispersal barriers for large carnivores in Poland

63%
Huck M., Jedrzejewski W., Borowik T., Milosz-Cielma M., Schmidt K., Jedrzejewska B., Nowak S., Myslajek R. W.
Acta Theriologica
|
2010
|
tom 55
|
nr 2
177-192
Carnivores are often particularly sensitive to landscape fragmentation. Ecological corridors may help to connect local populations, ensuring gene flow and retaining viable meta-populations. We aimed to establish habitat suitability models for two large carnivores in Poland, the grey wolf Canis lupus Linnaeus, 1758 and the Eurasian lynx Lynx lynx Linnaeus, 1758, based on ecological niche factor analysis (ENFA). Secondly, we calculated least cost paths (LCPs) based on cost values obtained from ENFA. Thirdly, we determined structures that might act as barriers, thus diminishing the value of the corridor unless appropriate conservation measures are taken. We compared some of the results with actual dispersal data of four lynx in eastern Poland. Results indicate that both species are highly marginalised. Less habitat that is currently available in Poland is suitable for lynx than for wolves. We determined a total of 76 LCPs. Comparison of these theoretical corridors with actual dispersal routes suggests that the traits of calculated LCPs are mostly within the range of those of real routes. We highlight a variety of features that might act as barriers, such as major roads (including planned highways), urbanized areas, and large un-forested areas. We give suggestions where concerted conservation efforts (eg wildlife passages) might be particularly well-directed.
5

Maxent modelling for distribution of plant species habitats of rangelands (Iran)

63%
Zare Chahouki M. A., Piri Sahragard H.
Polish Journal of Ecology
|
2016
|
tom 64
|
nr 4
Quantifying the pattern of habitat distribution for range plant species can assist sustainable planning of rangeland use and management. However, data of plant species distribution are often scarce and modeling of habitat distribution using commonly used models is difficult. In this study, the Maximum Entropy Method (MaxEnt) was used to model the distribution of plant habitat to find the effective variables in plant species occurrence in the Poshtkouh rangelands on Yazd province, central Iran. Maps of the environmental variables were generated using GIS and Geostatistics facilities. Accuracy of model output was assessed using area under the curve (AUC) of the receiver operating characteristic and keeping 30 percent of the data. Evaluation of model accuracy by AUC indicated good and acceptable predictive accuracy for all plant species habitats, except Artemisia sieberi which had high frequency. The predictive maps of Artemisia aucheri, Scariola orientalis — Astragalus albispinus, A. sieberi₂ and A. sieberi — Zygophyllum eurypterum had fair agreement with their corresponding observed maps. In addition, the accuracy of S. orientalis — A. sieberi and Tamarix ramosissima predictive maps was low and the estimated conformity rate of prediction and observed maps was poor. In fact, due to differences in the optimal ecological range, level of agreement of predictive and observed maps at each site was different. MaxEnt was substantially excellent to predict distributions of plant species habitat with narrow ecological niches e.g. Rheum ribes — A. sieberi, Seidlitzia rosmarinus and Cornulaca monacantha. It can also perform well with fairly few samples due to employing regularization.
6

Bank voles and yellow-necked mice: what are interrelations between them?

63%
Grum L., Bujalska G.
Polish Journal of Ecology
|
2000
|
tom 48
|
nr Suppl.
7

Vegetation structure and ecological characteristics of forest of North Andaman Islands (India)

51%
Prasad P. R. C., Sringeswara A. N., Reddy C. S., Kumari P. V., Varalakshmi R. K., Raza S. H., Dutt C. B. S.
Biological Letters
|
2009
|
tom 46
|
nr 2
8

Podstawy teorii metazbiorowisk rolinnych

51%
Szymura T. H., Szymura M.
Acta Botanica Silesiaca
|
2015
|
tom 11
9

Ecological niches of five big ungulates in a forest tract

51%
Dzieciolowski R. M.
Folia Forestalia Polonica. Series A . Forestry
|
1991
|
tom 33
10

Ecological niche of Dreissena polymorpha [Pall.] aggregations in the heated Konin Lakes System

51%
Sinicyna O. O., Protasov A. A., Zdanowski B., Kraszewski A.
Archives of Polish Fisheries
|
2001
|
tom 09
|
nr 1
The zebra mussel, Dreissena polymorpha (Pall.) inhabits various live and dead substrates of the lotic and lentic zones of the heated Konin lakes. Occurring at depths from 20 cm to 3.5 m, this species showed a preference for Unionidae mussels as a substrate. Aggregations of D. polymorpha varied in number from 2 000 to 2 million individuals per m², while the biomass reached more than 12 kg m⁻² . The most numerous were one year old mussels 5 mm in length, which comprised from 60 - 80% of the population. In the preliminary cooling reservoir, newly settled post-veligers comprised as much as 94% of the total of D. polymorpha numbers. The largest mussels did not exceed 35 mm. Aggregations of D. polymorpha contained 49 invertebrate taxa, and the most frequently occurring subdominants were from the Corophidae and Gammaridae families. The diel destruction of organic matter in the aggregations varied between 20 and 370 kJ m⁻² , depending on the number of animals and their biomass. The turnover coefficient (R/B) in the heated zones was 1.5 times higher, on average, than in the non-heated parts of the system.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.