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Thermoregulation of Acanthosaura lepidogaster in Luokeng Nature Reserve,Guangdong

2014; Sichuan Society of Zoological; Linguagem: Inglês

1000-7083

Mao Zhigan,

Amphibian and Reptile Biology

From September to October,2008,we measured the field active body temperatures,the selected body temperatures( Tsel),the critical thermal minimum( CTMin) and the critical thermal maximum( CTMax),the diel variation in body temperature,the relationship between the body temperatures( in resting) and the ambient temperatures of Acanthosaura lepidogaster in Luokeng Nature Reserve of Guangdong Province. Results showed that in the wild,the active body temperature( Tb) of Acanthosaura lepidogaster was higher than substrate temperature( Ts) and air temperature( Ta) and positively related with the latter two( Tb= 2. 938 + 0. 994 Ts,r2= 0. 926,F1,60= 751. 66,P 0. 0001; Tb= 2. 045 + 0. 955 Ta,r2=0. 897,F1,60= 523. 39,P 0. 0001). The active body temperature of wild lizard showed monthly difference,and no difference was observed among ages. When temperature of laboratory ranged from 9℃ to 35℃,the body temperature of resting( Tb) was positively correlated with the environment temperature( Te) : Tb= 2. 5446 + 0. 8881Te( F1,73= 156. 34,r2=0. 990,P 0. 001). In the environment without thermal gradients,Tbwas significantly higher than Taand Ts( P 0.05),and positively related with the latter two( Tb= 8. 060 + 0. 683 Ta,r2= 0. 313,F1,70= 31. 86,P 0. 0001; Tb= 9. 101 +0. 614 Ts,r2= 0. 258,F1,70= 24. 341,P 0. 0001). Tsel,CTMinand CTMaxof A. lepidogaster were 29. 51℃ ± 0. 31℃,6. 33℃ ± 0. 26℃ and 40. 40℃ ± 0. 69℃,respectively. Further analysis indicated that A. lepidogaster had both physiological and behavioral thermoregulation. However,the physiological thermoregulation was weaker than that of other lizard species,which might be accorded with its rapid locomotion.