Communities of small mammals in suburban area and undeveloped lands of Yakutsk

Communities of insectivorous and rodents of Yakutsk were investigated. 3338 cone-days, 106 days of exposure of glue traps were worked out in summers of 2017–2018, and 414 specimens of small mammals were caught. For comparison, materials collected in the same area in 1993–1997 (4000 cone-days and 700 specimens of small mammals) were used. A population of small mammals of undeveloped urban lands and suburban area of Yakutsk includes 14 species. Investigations in 2017–2018 expanded the list by catching Sorex roboratus and Apodemus peninsulae. The communities of the suburban area are typical for natural biotopes of the region: Clethrionomys rutilus and Sorex caecutiens dominate in forest stations, Microtus oeconomus, M. gregalis and S. tundrensis in meadows and bushes. In the undeveloped parts of the city there was a decrease in the number and species diversity of taiga species and an increase in the proportion of inhabitants of meadows. Among eusynanthropes outside of buildings in the city only Mus musculus was caught, immigration of the eusynanthropes to the natural habitats was not registered. At the fauna level, the communities of urban and suburban areas differ, as a rule, by only 1 or 2 species, which does not exceed interannual differences within landscape sites. At the same time, the communities of small mammals in the undeveloped areas of the city differ sharply in composition and structure from the communities of surrounding biotopes and are close to the floodplain ones in terms of the average number of species, indices of species diversity and dominance, which are indexes of community sustainability. The similarity of the population of the undeveloped areas of the city with the floodplain communities indicates the ecological instability of the urban communities.

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