Abstract
Data on current habitat ranges of five species of semiaquatic mammals are given in the article. The data were collected in various parts of Sikhote-Alin in 2002–2012. Four of the species, American mink (Neovison vison Schreb.), muskrat (Ondatra zibethicus L.), Eurasian beaver (Castor fiber L.), and Canadian beaver (C. canadensis Kuhl), are introduced. A native species is the otter (Lutra lutra L.). The stages of introduction and peculiarities of distribution of the semiaquatic species populations are described. The spatial distribution of the animals on the Obor and Durmin rivers selected as the model ones by us previously is analyzed (Oleinikov, 2007). The middle reaches of these rivers demonstrate the greatest variety of semiaquatic species, and their density is maximal in the lower reaches, which is mainly due to the muskrat. The spatial dissociation as a mechanism of alleviation of interspecific relationships is revealed.
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