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Seasonal Forcing on the Dynamics of Clethrionomys rufocanus: Modeling Geographic Gradients in Population Dynamics

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Title: Seasonal Forcing on the Dynamics of Clethrionomys rufocanus: Modeling Geographic Gradients in Population Dynamics
Authors: STENSETH, Nils Chr. Browse this author
BJØRNSTAD, Ottar N. Browse this author
SAITOH, Takashi Browse this author
Keywords: phenomenological model
length of summer and winter
seasonal and annual dynamics
the grey-sided vole
Issue Date: 1998
Publisher: Society of Population Ecology
Journal Title: Researches on population ecology
Volume: 40
Issue: 1
Start Page: 85
End Page: 95
Abstract: We interpret the gradient in population dynamics from the southwestern part of the island of Hokkaido to its northeastern part within the framework of a phenomenological model. In Hokkaido, as in other northern regions, both spring and fall is considered as short transition periods between the two main seasons ミ summer (the primary breeding season) and winter (the non-reproductive or secondary breeding season). We show that the geographic transition in dynamics may be understood as the combined consequence of different patterns of density-dependence during summer and winter, and geographically varying season lengths. Differences are shown to exist between summer and winter with respect to strength of density-dependence. Direct density-dependence, in particular, is stronger during winter than during summer. A model is presented to show how relative lengths of seasons can induce both stable and periodically fluctuating population dynamics. The results are compared and contrasted with what is otherwise known about the gradient in rodent dynamics in Fennoscandia.
Type: article
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 齊藤 隆

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