Grand Teton National Park Report
Multiannual fluctuations in population density ("cycles") of small rodents are well known (Elton 1942). Numerous hypotheses have been proposed to explain this phenomenon (for reviews see Krebs and Myers 1974, Finerty 1980, Taitt and Krebs 1985). However, none of these hypotheses, alone or in combination, have been able to explain the causality of cycles.
Pinter, Aelita 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. 14
, Article 25.
Available at: http://repository.uwyo.edu/uwnpsrc_reports/vol14/iss1/25