Инд. авторы:	Potapov M.A.0, Nazarova G.G., Muzyka V.Y., Potapova O.F., Evsikov V.I.
Заглавие:	Extrinsic and intrinsic factors of regulation of reproductive potential in the water vole (Arvicola amphibius) population from Western Siberia
Библ. ссылка:	Potapov M.A.0, Nazarova G.G., Muzyka V.Y., Potapova O.F., Evsikov V.I. Extrinsic and intrinsic factors of regulation of reproductive potential in the water vole (Arvicola amphibius) population from Western Siberia // Rodents: Habitat, Pathology and Environmental Impact. - 2012. - P.23-41. - ISBN 9781614708339.
Внешние системы:	SCOPUS: 2-s2.0-84895347688;
Реферат:	eng: The European water vole (Arvicola amphibius) dominates in rodent assemblies in Northern Baraba Lowland (Western Siberia) where its populations exhibit pronounced 4-9 year-long cyclic fluctuations in numbers. One of the principle peculiarities of water voles ecology in West Siberia is usage of different habitat sites during reproductive season and wintering. In summer they are aquatic and live and reproduce in wetlands, while in winter they are fossorial and live underground in meadows. The water vole has proved an excellent model species to investigate the role of both extrinsic and intrinsic mechanisms in driving population cycles. Using data from multi-annual study, we investigated the dependence of female's breeding success on extrinsic conditions influencing the availability of wet biotopes, food resources and intrinsic factors (density dependent). We also investigated the relation of winter survival to mass of food storage. Abiotic factors have a direct influence on the availability of habitat-related resources. In summer, the main extrinsic factor influencing reproductive potential of the water vole is hydrological regime, i.e. variable water supply determining the area of suitable biotopes. Our analysis has revealed correlation between flow intensity of the Om River in the study area and population dynamics, average number of live embryos in overwintered females, and percentage of mature young-of-the-year females in different years of study. Female reproductive characteristics appeared to be sensitive to effects of both extrinsic (availability of suitable biotopes) and intrinsic (density) factors. It was found that interaction of these factors determines the level of competition among reproductively active females as detected by number of injuries on skins and consequently embryonic losses and decline of population numbers. In severe continental Siberian climate winter survival of voles depends on amount of food stores which, in turn, depends on population density influencing competition level. Participating of the young-of the-year females in reproduction has effect on their winter survival. They stay in wet biotopes for late summer and have not enough time to gather necessary for safe wintering amount of food stores. Because of higher female winter mortality, sexual structure of the population in spring is unbalanced. This leads to high level of inter-male competition for receptive females and strong selection among overwintered males. Thus, the obtained data indicate that in the water vole from Western Siberia the extrinsic and intrinsic factors closely interact both in summer and in winter regulating reproductive potential and density of the population. © 2012 by Nova Science Publishers, Inc. All rights reserved.
Издано:	2012
Физ. характеристика:	с.23-41