北草蜥禁食期间喜好体温的漂移  

Northern grass lizards Takydromus septentrionalis(Lacertidae) shift thermal preferences when fasted

作　　者：杜宇[1] 丁国骅[1] 孙燕燕[2] 计翔[1] 

机构地区：[1]南京师范大学生命科学学院江苏省生物多样性和生物技术重点实验室 [2]杭州师范大学生命科学学院杭州市动物科学与技术重点实验室,杭州310036

出　　处：《动物学报》2008年第4期739-743,共5页ACTA ZOOLOGICA SINICA

基　　金：江苏省生物多样性和生物技术重点实验室资助项目~~

摘　　要：We used Takydromus septentrionalis as a model animal to examine whether lizards shift thermal preferences when fasted. The experiment was conducted in March 2007. Thirty-six adults collected from Shengsi, Zhoushan Islands, were equally assigned to experimental (fasted) and control (fed) groups, with nine housed together in a 0.6 m×0.2 m×0.5 m glass cage with moist soil (10 cm in depth), debris and grasses. A 100-W light bulb suspended above one end of each cage created a thermal gradient ranging from room temperatures (15℃-24℃) to 60℃ for 12 h daily, so that lizards could thermoregulate during the photophase. Prior to the experiment, lizards were allowed to feed on mealworms (larvae of Tenebrio molitor) for 10 days. Thereafter experimental lizards were fasted for 20 days, and were measured for thermal preferences on Day 1-10, Day 15 and Day 20 since fasting. We found in fasted lizards that selected body temperature (Tsel, a measure of thermal preference) gradually decreased from 32.4℃ to 30.9℃ in the first four days, and then increased to a level similar to that (32.9℃) recorded in the controls. Lizards fasted for 9 days or longer did not differ from controls in Tsel. Our study is the first to demonstrate that lizards fasted for a prolonged time may shift thermal preferences in a pattern well fitting to a Gaussian peak curve.We used Takydromus septentrionalis as a model animal to examine whether lizards shift thermal preferences when fasted. The experiment was conducted in March 2007. Thirty-six adults collected from Shengsi, Zhoushan Islands, were equally assigned to experimental （fasted） and control （fed） groups, with nine housed together in a 0.6 m × 0.2 m × 0.5 m glass cage with moist soil （ 10 cm in depth）, debris and grasses. A 100-W light bulb suspended above one end of each cage created a thermal gradient ranging from room temperatures （15℃ - 24℃ ） to 60℃ for 12 h daily, so that lizards could thermoregulate during the photophase. Prior to the experiment, lizards were allowed to feed on mealworms （larvae of Tenebrio molitor ） for 10 days. Thereafter experimental lizards were fasted for 20 days, and were measured for thermal preferences on Day 1 - 10, Day 15 and Day 20 since fasting. We found in fasted lizards that selected body temperature （Tsel, a measure of thermal preference） gradually decreased from 32.4℃ to 30.9℃ in the first four days, and then increased to a level similar to that （32.9℃） recorded in the controls. Lizards fasted for 9 days or longer did not differ from controls in Tsel. Our study is the first to demonstrate that lizards fasted for a prolonged time may shift thermal preferences in a pattern well fitting to a Gaussian peak curve

关 键 词：蜥蜴科 北草蜥 禁食喜好体温 高斯峰曲线 体温调节 

分 类 号：Q4[生物学—生理学]