舟山眼镜蛇对光暗周期加热光源反应所导致的体温变化

用 7条舟山眼镜蛇 (Najaatra)研究动物对光暗周期加热光源反应所导致的体温变化。设计两项实验 ,每项实验历时 9d。实验一光照期覆盖整个白天 ,实验二光照期覆盖整个晚上。眼镜蛇仅在加热光源开启期间进行体温调节 ,但光照期内任何阶段都未发现所有个体同时处于热活动状态。两项实验中热活动个体百分比的时间变化显著 ,实验二热活动个体百分比波动相对大于实验一。在加热光源开启期间 ,实验一热活动眼镜蛇的百分比总体上大于实验二。在两项实验中 ,热活动眼镜蛇体温的时间变化都不显著。实验一热活动眼镜蛇的体温高于实验二 ,而两项实验中不处于热活动状态的眼镜蛇的平均体温无显著差异。实验一热活动眼镜蛇 (31 1±0 8°C)选择的体温上限高于实验二眼镜蛇 (2 6 0± 0 9°C)。在两项实验的任何时间段内 ,眼镜蛇的体温都不低于环境温度。

Variation in body temperature as a consequence of the response to heating lights under a light-dark cycle in the Chinese cobra Naja atra

We used 7 Chinese cobras Naja atra to investigate variation in body temperature as a consequence of the response to heating lights under a light-dark cycle.Two trials of which each lasted 9 successive days were conducted,with one trial having lights on during the day (DPNS,day/photophase-night/scotophase) and the other having lights on during night (NPDS,night/photophase-day/scotophase).Cobras could regulate their body temperatures when the lights were on; however,at no time during the photophase did all cobras simultaneously maintain higher body temperatures.Temporal variation in the percentage of thermally active cobras was evident in both trials,with the oscillations of activity being relatively more obvious in the NPDS trial.During the photophase,the percentage of thermally active cobras generally was higher in the DPNS trial than in the NPDS trial.Temporal variation in body temperature was not evident for thermally active cobras in either trial.Thermally active cobras maintained on average higher body temperatures in the DPNS trial than in the NPDS trial,whereas thermally inactive cobras did not differ in mean body temperature between both trials.The upper level of body temperatures selected by thermally active cobras was higher in the DPNS trial (31.1±0.8° C) than in the NPDS trial (26.0±0.9° C).At no time during the course of each trial did cobras maintain body temperatures lower than ambient temperaturesActa Zoologica Sinica 51(1):38-45,2005].