期刊
BASIC AND APPLIED ECOLOGY
卷 10, 期 2, 页码 170-177出版社
ELSEVIER GMBH
DOI: 10.1016/j.baae.2008.03.002
关键词
Demography; Homogeneity; Meadow vole; Microtus ochrogaster; Microtus pennsylvanicus; Population cycles; Prairie vole
类别
资金
- University of Illinois School of Life Sciences [NSF DEB 78-25864, NIH HD 09328]
- Graduate College Research Board
Most research on fluctuations of arvicoline rodents has focused on changes in demographic variables across phases. Here, we examined whether demographic variables varied within a phase (trough, increase, and decline) across 30 fluctuations of Microtus ochrogaster and 14 fluctuations of Microtus pennsylvanicus over 25 years. For each species, we tested for phase homogeneity (i.e., values of demographic variables were invariant across all fluctuations within a given phase) for the following demographic variables: monthly survival (total, adult, young), proportion of reproductively active adult males and females, proportion of young, and proportion of immigrants. We found phase homogeneity for 96.7% of the 582 phase/fluctuation data sets for the seven variables, in the three phases of across all fluctuations in the three habitats for M. ochrogaster and 98.0% of 254 of those for M. pennsylvanicus in two habitats. We conclude that for each of these two species demographic variables are relatively invariant both within a phase and across fluctuations. (C) 2008 Gesellschaft fur Okologie. Published by Elsevier GmbH. All rights reserved.
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