Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 4

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: habitat characteristics

Sortuj według:

Ogranicz wyniki do:

Potholes of mountain river as biodiversity spots: structure and dynamics of the benthic invertebrate community

100%

Ren H. , Yuan X. , Yue J. , Wang X. , Liu H.

Polish Journal of Ecology

2016

tom 64

nr 1

Temporary freshwater rock pools, as special, small-sized and isolated habitats, provide ideal systems for studying island biogeography and ecological theories and processes. In this study, a total of 70 potholes of mountain rivers were sampled during the four seasons from November 2013 to October 2014 to assess the structure of the benthic invertebrate community and to identify the relationships between habitat characteristics and the community composition. Pothole area ranged from approximately 0.01 to 0.39 m², and pothole depth ranged from 0.03 to 0.74 m. Forty-three taxa belonging to 37 families and 16 orders were collected from the potholes. The highest numbers of benthic invertebrate taxa were observed in summer and the highest average number of taxa per pothole (8.5) was observed in autumn. The diversity was the highest in spring, and the average densities of benthic invertebrates were highest in autumn. Large potholes supported more taxa than small ones and significant relationships between richness and pothole area, richness and water volume were observed. The results of Redundancy Analysis show that the community composition of benthic invertebrates in the potholes was closely correlated with water temperature, pothole area and water depth. Our results indicate that benthic invertebrate communities in river potholes are mainly structured by water depth, pothole area and water volume. The seasonal changes are also an important factor determining the presence/absence of certain taxa.

Habitat preferences of the Collared Flycatcher, Ficedula albicollis (Temm.) in mountains of continental Croatia

100%

Kralj J. , Ćiković D. , Dumbović V. , Dolenec Z. , Tutis V.

Polish Journal of Ecology

2009

tom Vol. 57, nr 3

537-545

Habitat selection of Collared Flycatcher, Ficedula albicollis (Temm.) was studied at three mountains of Continental Croatia covered with oak-hornbeam, beech and coniferous forests. Standard point count technique was used (n = 163). Collared Flycatcher territories were found at 59 points, 17 of them identified as the best territories, with two or more pairs present. Habitat at each counting point was described by the circular plot method. Each counting point was further characterized by the forest type. Differences between the proportions of available and used forest types were tested with [x^2] goodness-offit test. Standardized selection index (B) and 95% confidence limits with Bonferroni correction were calculated. PCA was used to identify the principal sources of variation in the habitat structure. In our study, both forest types and structural characteristics of habitat had effect on the habitat choice of the Collared Flycatcher. The Collared Flycatcher preferred oak and beech forests and strictly avoided pure coniferous stands. The best territories are mostly situated in the pure beech and mixed beech forests. PCA on habitat characteristics produced five components which accounted for 84.3% of the variation in the habitat structure. PC1 and PC3 indicated the presence of coniferous trees while PC2 and PC4 indicated the forest age. The PCA revealed significant relationship between Collared Flycatcher presence and several structural characteristics of habitat: total tree density, densities of small and large trees, shrub density and average tree basal area. The best territories were situated in the forest patches with low number of large trees. Tree density is an important factor for habitat selection in younger forests, but in stands older than 100 years, other factors play more important role in the habitat selection. The Collared Flycatcher avoided forests with dense shrub layer.

Some floristic and habitat peculiarities of the coastal pine forests Empetro nigri-Pinetum Libb. et Siss. in Libb. 1940 em. Wojt. 1964 nom. invers.

100%

Balcerkiewicz S.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

2004

tom 69

Conditions controlling the colonization of an orange orchard by Microtus duodecimcostatus [Rodentia, Arvicolidae]

100%

Mira A. , Luz Mathias M.

Polish Ecological Studies

1994

tom 20

nr 3-4