Barnes B M, York A D
Institute of Arctic Biology, University of Alaska, Fairbanks 99775-0180.
J Biol Rhythms. 1990 Summer;5(2):119-30. doi: 10.1177/074873049000500204.
We tested whether prevention of hibernation in ground squirrels by midwinter exposure to high ambient temperatures influenced timing of the spring phase of reproductive maturation and the phase and period of subsequent circannual rhythms of reproduction and body mass. Exposing hibernating adult male Spermophilus lateralis to 30 degrees C for 6 weeks beginning December 4 advanced the timing of testicular recrudescence by 4-5 weeks, compared to controls left at 4 degrees C. Males exposed to 30 degrees C for 6 weeks beginning at the average time of spontaneous end of hibernation (January 15) reached reproductive maturation at a time intermediate to those of controls and of the December 4 experimental group. However, neither the date of the subsequent fall's body mass peak, the date of the next year's reproductive maturation, nor the periods of circannual rhythms of body mass and reproduction differed among groups. Premature interruption of hibernation appears to allow early expression of reproduction, but does not affect the underlying timing mechanism.
我们测试了在冬季中期将地松鼠暴露于高环境温度下以防止其冬眠，是否会影响生殖成熟春季阶段的时间安排以及随后繁殖和体重的年周期节律的阶段和周期。从12月4日开始，将冬眠的成年雄性侧纹黄鼠暴露于30摄氏度环境中6周，与置于4摄氏度环境中的对照组相比，睾丸再发育的时间提前了4 - 5周。从冬眠自然结束的平均时间（1月15日）开始，将雄性暴露于30摄氏度环境中6周，其达到生殖成熟的时间介于对照组和12月4日实验组之间。然而，各组之间随后秋季体重峰值的日期、次年生殖成熟的日期以及体重和繁殖的年周期节律的周期并无差异。过早中断冬眠似乎能使繁殖提前表达，但不会影响潜在的时间机制。
