factors

ENVIRONMENTAL ORGANIZATION OF THE SPATIAL-TYPOLOGICAL DIVERSITY OF COMMUNITIES OF AMPHIBIANS, REPTILES AND SMALL MAMMALS IN THE WEST SIBERIAN PLAIN

The differences in estimates of the relation of the population diversity of amphibians, reptiles and small mammals with environmental factors were analyzed by the species’ abundance and contributions to the Shannon index on the basis of their energy indices, as well as the difference in general representations of the spatial-typological variability of the communities of these animal groups with the West Siberian Plain as an example.

SPATIAL HETEROGENEITY OF THE ICHTHYOFAUNA OF NORTHERN EURASIA AND ITS BIOGEOGRAPHICAL DIVISION

Authors: Ravkin Y. S., Yadrenkina E. N., Interesova E. A., Bogomolova I. N., Yudkin V. A., Lyalina M. I., Kosareva A. M.

Biogeographical division of Northern Eurasia (within the former USSR borders) was carried by the results of our cluster analysis of the fish fauna from 597 sites according to the BIODAT database territory division. Our classification obtained on the basis of the Jacquard similarity coefficients includes 2 regions, 12 dominion, 8 provinces, and 11 districts. The offered division considers 67% of the similarity coefficient dispersion of the fauna analyzed, which is by 21% higher than an earlier developed scheme (Berg, 1962) which includes a bigger area of the continent.