Barnes B M
Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks 99775-0180.
Science. 1989 Jun 30;244(4912):1593-5. doi: 10.1126/science.2740905.
Hibernating arctic ground squirrels, Spermophilus parryii, were able to adopt and spontaneously arouse from core body temperatures as low as -2.9 degrees C without freezing. Abdominal body temperatures of ground squirrels hibernating in outdoor burrows were recorded with temperature-sensitive radiotransmitter implants. Body temperatures and soil temperatures at hibernaculum depth reached average minima during February of -1.9 degrees and -6 degrees C, respectively. Laboratory-housed ground squirrels hibernating in ambient temperatures of -4.3 degrees C maintained above 0 degree C thoracic temperatures but decreased colonic temperatures to as low as -1.3 degrees C. Plasma sampled from animals with below 0 degree C body temperatures had normal solute concentrations and showed no evidence of containing antifreeze molecules.
冬眠的北极地松鼠（Spermophilus parryii）能够适应并自发地从低至-2.9摄氏度的核心体温中苏醒而不被冻伤。通过植入温度敏感型无线电发射器来记录在室外洞穴中冬眠的地松鼠的腹部体温。在2月份，冬眠处深度的体温和土壤温度分别达到平均最低值-1.9摄氏度和-6摄氏度。在-4.3摄氏度环境温度下冬眠的实验室饲养地松鼠，其胸部温度维持在零度以上，但结肠温度降至低至-1.3摄氏度。从体温低于零度的动物身上采集的血浆具有正常的溶质浓度，且没有证据表明含有抗冻分子。
