广东罗坑自然保护区丽棘蜥的体温调节

Thermoregulation of Acanthosaura lepidogaster in Luokeng Nature Reserve,Guangdong

2008年9-10月在广东省罗坑自然保护区,测定了丽棘蜥Acanthosaura lepidogaster在自然条件下的野外活动体温,实验室条件下的选择体温、热耐受性、静止状态下丽棘蜥的体温以及昼夜体温变化等热生物学指标。结果显示：在自然条件下,丽棘蜥的野外活动体温（Tb）高于基质温度（Ts）和空气温度（Ta）,并与后二者呈正相关关系（Tb=2.938＋0.994Ts,r2=0.926,F1,60=751.66,P〈0.0001;Tb=2.045＋0.955Ta,r2=0.897,F1,60=523.39,P〈0.0001）。丽棘蜥的野外活动体温存在明显的月份间差异,但无年龄上的差异。环境温度为9-35℃的实验条件下,丽棘蜥的静止体温（Tb）与环境温度（Te）呈正相关关系：Tb=2.5446＋0.8881Te（F1,73=156.34,r2=0.990,P〈0.001）;在缺乏温度梯度的环境中,丽棘蜥的昼夜体温显著高于空气温度和基质温度（P〈0.05）,并与后二者呈正相关关系（Tb=8.060＋0.683Ta,r2=0.313,F1,70=31.86,P〈0.0001;Tb=9.101＋0.614Ts,r2=0.258,F1,70=24.341,P〈0.0001）。丽棘蜥的选择体温、耐受低温和耐受高温分别是29.51℃±0.31℃、6.33℃±0.26℃和40.40℃±0.69℃。丽棘蜥的体温调节模式既有行为调节也有生理调节,但是相对于其他活动较多的蜥蜴而言,丽棘蜥的生理调节能力较弱,这可能与其运动能力比较强的行为特点有关。

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 die1 variation in body temperature, the relationship between the body temperatures （in resting） and the ambient temperatures of Acanthosaura lepigaster 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 （ T ） and air temperature （ Ta ） and positively related with the latter two （ Tb = 2. 938 ＋ 0. 994T, r2= 0. 926, F1.60 = 751.66, P 〈 0. 0001 ; Tb = 2. 045 ＋ 0. 955Ta, 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 （T,） ： Tb = 2. 5446 ＋ 0. 8881Te （F1.73 = 156.34, r2 = 0. 990, P 〈 0. 001 ）. In the environment without thermal gradients, Tb was significantly higher than Ta and Ts （P 〈 0.05 ） , and positively related with the latter two （Tb = 8. 060 ＋ 0. 683T, r2 = 0. 313, F1,70 = 31.86, P 〈 0. 0001 ; Tb = 9. 101 ＋ 0.614Ts, rz =0.258, F1.70 =24. 341, P 〈0. 0001）. Tsel, CTMIn and CTMox ofA. 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.