Photoperiodic induction of diurnal locomotor activity in Microtus montanus, the montane vole

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Abstract
Some microtine species are nocturnal in the summer and diurnal in the winter. This activity shift has been induced in Microtus montanus in the laboratory using photoperiod alone as a cue. The shift from nocturnal to diurnal activity involves modifying the intensity and timing of short activity bouts. This phenomenon may be a mechanism for avoiding harsh microclimates.