文章基本信息

标题：Seasonality, density dependence, and population cycles in Hokkaido voles
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作者：Nils Chr. Stenseth ; Hildegunn Viljugrein ; Takashi Saitoh 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2003
卷号：100
期号：20
页码：11478-11483
DOI：10.1073/pnas.1935306100
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Voles and lemmings show extensive variation in population dynamics regulated across and within species. In an attempt to develop and test generic hypotheses explaining these differences, we studied 84 populations of the gray-sided vole (Clethrionomys rufocanus) in Hokkaido, Japan. We show that these populations are limited by a combination of density-independent factors (such as climate) and density-dependent processes (such as specialist predators). We show that density-dependent regulation primarily occurs in winter months, so that populations experiencing longer winters tend to have a stronger delayed density-dependence and, as a result, exhibit regular density cycles. Altogether, we demonstrate that seasonality plays a key role in determining whether a vole population is cyclic or not.
关键词：Clethrionomys rufocanus ; seasonal and annual density dependence ; state-space modeling ; sampling variance