Friedman D, Haim A, Zisapel N
Department of Biology, University of Haifa at Oranim, Kiryat Tivon, Israel.
Physiol Behav. 1997 Aug;62(2):407-11. doi: 10.1016/s0031-9384(97)00040-1.
Daily rhythms of activity and body temperature were measured in golden spiny mice Acomys russatus, acclimated for 2 weeks, at least, to 2 different photoperiod regimes (16L:8D; 8L:16D) at a constant ambient temperature of 28 degrees C. For recording body temperature, VM-FM (Mini-Mitter Co. Inc., Sunriver, OR) transmitters were implanted. For activity measurements, an infrared sensor (Hengstar BL 68 907F, Japan, using a Lodestar PS-303 power supply, Taiwan) mounted on each cage. Both rhythms were also measured in the same individuals exposed to chemical signals released in the urine of A. cahirinus. The results of this study show that both rhythms of A. russatus correlate and respond to changes in photoperiod regimens, as well as to the chemical signals. However, the correlation changes under the 2 photoperiod regimens. Under LD acclimation, a decrease in the correlation is noted, as a response to the addition of chemical signals. Our results suggest that the different responses due to the different light regimens represent 2 seasons in nature, where presumably each season demands a different physiological response.
在28摄氏度的恒定环境温度下，对金刺鼠（Acomys russatus）进行了活动和体温的每日节律测量。这些金刺鼠至少适应了2周的2种不同光周期模式（16小时光照：8小时黑暗；8小时光照：16小时黑暗）。为了记录体温，植入了VM - FM（Mini - Mitter Co. Inc.，俄勒冈州森里弗）发射器。为了测量活动，在每个笼子上安装了一个红外传感器（日本恒星BL 68 907F，使用台湾Lodestar PS - 303电源）。在暴露于埃及刺鼠（A. cahirinus）尿液中释放的化学信号的同一批个体中也测量了这两种节律。这项研究的结果表明，金刺鼠的这两种节律都与光周期模式的变化以及化学信号相关并对其作出反应。然而，在这两种光周期模式下相关性会发生变化。在长日照适应条件下，随着对化学信号添加的反应，相关性会降低。我们的结果表明，由于不同光照模式导致的不同反应代表了自然界中的两个季节，大概每个季节都需要不同的生理反应。
