Climate change and the initiation of spring breeding by deer mice in the Kananaskis Valley, 1985–2003

Deer mice {Pemmy.'icus maniculatus (Wagner. 1845)) in the Kanana.skis Valley were monitored from 1985 to 2003 by livetrapping. and first parturition dates were compared among years and examined in relation to spring weather. On average, first litters were conceived on 2 May. well after the winter snowpack melted (19 March} and just hefore average temperatures reached 0 "C (8 May). Firsl parturitions took place on 26 May. when average temperatures were above freezing. The average temperature at the time of conceptions Clate April - early May) declined by approximately 2 °C, and the date that the average temperatures reached 0 "C was 11 days later, between 1985 and 2003, with poten- tial eftects for summer phenology. Spring temperatures, but not snowfall, were related to the Ei Niiio Southern Oscilla- tion index. The initiation of breeding by deer mice was variable among years, bul was not related to snowfall or temperature and did not change, on average, between 1985 and 2003. The decrease in spring temperatures had no no- ticeable effects on breeding success. We conclude thai photoperiod may be a primary cue for the initiation of spring breeding and that food resources over winter may explain the among-year variation in the initiation of breeding.

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