Some demographic aspects of dispersers in fluctuating populations of the vole Microtus townsendii [population density, Reifel Island, British Columbia, Canada]
1981
Beacham, T.D. (Pacific Biological Station, Nanaimo, British Columbia (Canada). Dept. of Fisheries and Oceans)
I studied dispersal of the vole Microtus townsendii by enclosing two populations and by providing an area inside each enclosure into which the voles could disperse. More males dispersed than females, but the excess of males was restricted to the adult weight class. At least 40% of the subadult dispersers were in breeding condition during the nonwinter periods, compared with a maximum of 15% of the residents. Juvenile and subadult dispersal was common during the peak summer. Selective dispersal during the increase and peak phases may be an important component of the microtine cycle.
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