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东北林蛙和黑龙江林蛙越冬前期体温调节差异
为了解环境温度对东北林蛙(Rana dybowskii)和黑龙江林蛙(R.amurensis)体温调节能力的影响,研究了2种林蛙在不同时间(07:00、10:00、13:00、16:00、19:00)、室温及梯度变温(10、12、14、16、18、20 ℃)等条件时的体温变化规律。结果表明:2种林蛙体温调节均无显著的性别差异,林蛙体温与环境温度的变化趋势一致。环境温度最高时,2种林蛙的体温也达到最高,体温与环境温度显著正相关;体温的变化幅度、回归方程的斜率和等温点3个参数可以作为判断体温调节能力的重要指标。东北林蛙的体温日变化幅度大于黑龙江林蛙。体温与环境温度的线性回归分析表明,东北林蛙斜率的绝对值大于黑龙江林蛙,东北林蛙的等温点低于黑龙江林蛙。与黑龙江林蛙相比,东北林蛙的体温波动较大,其体温调节能力较低。