Refinetti R
Department of Psychology, College of William & Mary, Williamsburg, VA 23187, USA.
J Comp Physiol A. 1995 Dec;177(6):701-5. doi: 10.1007/BF00187629.
Golden hamsters and thirteen-lined ground squirrels were maintained individually in a thermal gradient (14 degrees C to 33 degrees C) for several weeks under a 14L:10D light-dark cycle. Animals of both species showed robust daily rhythms of body temperature and locomotor activity with acrophases consistent with the habits of the species (diurnal acrophases in the diurnal squirrels and nocturnal acrophases in the nocturnal hamsters). Hamsters showed a robust daily rhythm of temperature selection 180 degrees out of phase with the rhythms of body temperature and locomotor activity. Squirrels did not show a daily rhythm of temperature selection. These results raise the hypothesis that a daily rhythm of temperature selection is exhibited by nocturnal but not by diurnal endotherms.
金黄仓鼠和十三条纹地松鼠在14小时光照:10小时黑暗的明暗周期下，于热梯度环境（14摄氏度至33摄氏度）中单独饲养数周。两个物种的动物均表现出强健的体温和运动活动日节律，其体温峰值相位与物种习性相符（昼行性松鼠的体温峰值相位在白天，夜行性仓鼠的体温峰值相位在夜间）。仓鼠表现出一种强健的温度选择日节律，其相位与体温和运动活动节律相差180度。松鼠未表现出温度选择日节律。这些结果提出了一个假说，即夜行性而非昼行性的恒温动物会表现出温度选择日节律。
