Effects of regime shifts on the population dynamics of the grey-sided vole in Hokkaido, Japan

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We explored the effects of regime shifts (drastic changes usually observed in marineecosystems, corresponding to climatic variability) in a terrestrial system focusing on a key event thatoccurred in 1976-77. We used data on the gray-sided vole Clethrionomys rufocanus (Sundevall, 1846)from 89 time series covering 31 yr (1962–1992), recorded in Asahikawa, Hokkaido, Japan, whereboth cyclic and non-cyclic populations occur. Wavelet analyses demonstrated a clear shift of dynamicpatterns in the mid-1970s, presumably resulting from the Aleutian Low Pressure (as measured by theAleutian Low Pressure Index). The vole populations exhibited erratic fluctuations until the mid-1970s, and then changed their pattern to cyclic fluctuations at a 4 yr interval. The structure of densitydependence changed during the regime shift. Although the strength of direct density dependencewas similar, delayed density dependence became stronger after the shift. Altogether these findingssuggest that changing climate may affect the ecological interactions among voles, predators andresources.
Inter-Researchの論文
2006-10-13