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The Population Dynamics of the Vole Clethrionomys rufocanus in Hokkaido, Japan

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Title: The Population Dynamics of the Vole Clethrionomys rufocanus in Hokkaido, Japan
Authors: SAITOH, Takashi Browse this author
STENSETH, Nils Chr. Browse this author
BJØRNSTAD, Ottar N. Browse this author
Keywords: cycle
geographical gradient
population variability
spatial scale
regional synchrony
Issue Date: 1998
Publisher: Society of Population Ecology
Journal Title: Researches on population ecology
Volume: 40
Issue: 1
Start Page: 61
End Page: 76
Abstract: Population dynamics of the gray sided-vole, Clethrionomys rufocanus, in Hokkaido, Japan were described on the basis of 225 time series (being from 12 to 31 years long); 194 of the time series have a length of 23 years or longer. The time series were classified into 11 groups according to geographic proximity and topographical characteristics of the island of Hokkaido. Mean abundance varied among populations from 1.07 to 21.07 individuals per 150 trap-nights. The index of variability for population fluctuation (s-index) ranged from 0.204 to 0.629. The other index for population variability (amplitude on log-10 scale) ranged from 0.811 to 2.743. Mean abundance and variability of populations were higher in the more northern and eastern regions of the island. Most populations, except for the southernmost populations, exhibited significant direct density-dependence in population growth. Detection rate for delayed density-dependence varied among groups from 0% to 22.6%. Both direct and delayed density-dependence tended to be stronger in the more northern and eastern populations. The proportion of cyclic populations was higher in the northern-eastern areas than that in the southern-western areas. There was a clear gradient from the asynchronous populations in southwest, to the highly synchronized populations in the northwest.
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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