Zavyalov N.A.,State Nature Reserve Rdeysky
Zoologicheskii Zhurnal | Year: 2012
The history of colonizing the eastern part of the Polistovo-Lovat bog system (Novgorod region, northwestern Russia) is described. The current state of the beaver population under specific conditions of watersheds and initial parts of the hydrographic network is assessed. In 25-30 years after the penetration of beavers to this territory, they colonized all water bodies. The present-day population density (1.48 km between adjacent lodges) appears to be the possible greatest for the given territory. The stable population has been formed; its core is large settlements (30 % of the total ones) on the periphery of the bog system; they consist of 6-8 individuals. The main type (89%) of the settlements is lodges; the dams are 85% of the settlements. The beaver activity has changed the area amounting to 1.16 % of the territory studied. Monitoring of the beaver population is expedient to be conducted in an area of 3-4 km wide around the whole bog system.