Hibernating patterns of free-ranging Columbian ground squirrels.

摘要: The patterns of torpor and euthermy during hibernation was documented for 28 free-ranging Columbian ground squirrels (Spermophilus columbianus) fitted with temperature-sensitive radio transmitter collars. Adult males began earlier, were euthermic a greater proportion the hibernating season emerged earlier than other age sex classes. adult females did not differ significantly from those juveniles. Emergence hibernaculum preceded by long (3–12 d) interval in but or Changes soil temperature appear to initiate emergence. time spent is interpreted as energy cost benefits offsetting these costs may be increased reproductive potential spring avoidance predation late summer.