Grand Teton National Park Report
A variety of hypotheses has been proposed to explain multiannual fluctuations in population density ("cycles") of small rodents (for reviews see Finerty 1980, Taitt and Krebs 1985). Doubtless, such cycles - known since antiquity (Elton 1942) - result from an interaction of a multitude of factors. However, the inability of extant hypotheses, alone or in combination, to explain the causality of cycles rests in no small measure with the fact that long-term studies of the phenomenon are notoriously uncommon.
Pinter, Alita J.
"Climatic Factors, Reproductive Success and Population Dynamics in the Montane Vole Microtus Montanus,"
University of Wyoming National Park Service Research Center Annual Report: Vol. 29
, Article 31.
Available at: http://repository.uwyo.edu/uwnpsrc_reports/vol29/iss1/31