The Population Dynamics of the Vole Clethrionomys rufocanus in Hokkaido, Japan
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概要
- 論文の詳細を見る
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.
- Society of Population Ecologyの論文
著者
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Saitoh T
Forestry And Forest Products Res. Inst. Kyoto Jpn
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Bjornstad Ottar
Division Of Zoology Department Of Biology University Of Oslo
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STENSETH Nils
Centre for Ecological and Evolutionary Synthesis (C.E.E.S.), Department of Biology, University of Os
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Stenseth N
Centre For Ecological And Evolutionary Synthesis (c.e.e.s.) Department Of Biology University Of Oslo
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Stenseth Nils
Centre For Advanced Study Norwegian Academy Of Science And Letters Division Of Zoology Department Of
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Stenseth Nils
Department Of Biology Centre For Ecological And Evolutionary Synthesis (cees) University Of Oslo
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Bjφrnstad Ottar
Division Of Zoology Department Of Biology University Of Oslo
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SAITOH Takashi
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Saitoh Takashi
Hokkaido Inst. Public Health Sapporo Jpn
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