Scent marking intensity of beaver (Castor fiber) along rivers of differentsizes

Citation
A. Ulevicius et L. Balciauskas, Scent marking intensity of beaver (Castor fiber) along rivers of differentsizes, Z SAUGETIER, 65(5), 2000, pp. 286-292
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
ZEITSCHRIFT FUR SAUGETIERKUNDE-INTERNATIONAL JOURNAL OF MAMMALIAN BIOLOGY
ISSN journal
0044-3468 → ACNP
Volume
65
Issue
5
Year of publication
2000
Pages
286 - 292
Database
ISI
SICI code
0044-3468(200010)65:5<286:SMIOB(>2.0.ZU;2-E
Abstract
The intensity of scent marking by territorial beavers could relate to diffe rent numbers of transient beavers. Rivers are, most likely, the main paths of beaver dispersal. It is supposed that the intensity of subadult migratio n depends upon the size of the river because those basins of larger rivers potentially contain a greater number of beavers. Scent marking intensity (t he number of scent mounds) and relative abundance (number of beaver activit y signs) of bravers were studied in 18 segments of various rivers in Lithua nia during the period of subadult dispersal during April and the first ten days of May. The total length of transect was 157 km. The yield of water (Q ) of these river segments varied from 0.4 to 32.2 m(3)/s. The Lithuanian beaver population is considered abundant. Even the smallest peripheral water bodies are densely inhabited by beavers thus making the di spersal of population surplus rather complicated. The highest scent marking intensity (1.78 scent mounds per 0.25 km of shore line) was found in mediu m-sized rivers (mean Q = 4.6 m(3)/s), and the lowest (0.64 scent mounds per 0.25 km of shore line) in the smallest rivers (mean Q = 0.6 m(3)/s). Scent marking intensity was significantly positively correlated with the relativ e abundance in most rivers excluding the smallest ones. The results are dis cussed in relation to an appropriate response of territory owners to the di fferent intensity of subadult migration in rivers of differing sizes. The s cent mound system seems to be an important mechanism of population self-reg ulation, preventing an overexploitation of ecological resources in rivers w here intensive migration of beavers occurs.