摘要
实验采用封闭式流体压力呼吸计和数字式温度计 ,分别测定了环境温度 (Ta)在 5～ 35℃范围内棕眉山岩鹨 (Prunellamontanella)的耗氧量和体温 (Tb) ,由此计算出代谢率 (MR)、热传导率 (C)和代谢预期比与热传导预期比 (F)等值 ,以探讨该种的代谢产热特征。结果表明 :棕眉山岩鹨在Ta 为 5～ 35℃时 ,Tb 基本维持恒定 (为 4 1 2 5± 0 12℃ ) ,MR的最低值为 4 2 7± 0 0 7mLO2 /(g·h) ;Ta 在 5～ 2 4℃时 ,MR与之负相关 :MR [mLO2 /(g·h) ]=10 39- 0 2 4Ta℃ ;Ta 在 5～ 2 6 5℃时 ,C最低且基本保持恒定 ,平均为 0 2 6±0 0 0mLO2 /(g·h·℃ ) ;Ta 在 2 4～ 30℃时 ,F值为 1 0 5 ,表明该种具有较好的体温调节能力。与热带地区鸟类比较 ,棕眉山岩鹨具较高的MR和Tb,稍高的C ,符合北方小型鸟类的代谢特点 ,能较好的适应冬寒冷、夏炎热的环境。
To study the characteristics of energy metabolism,metabolic rate (MR),body temperature (T b),and thermal conductance ( C ) were determined at a temperature range of 5-35?℃ in 5 male and 3 female Siberian accentors ( Prunella montanella ) from Qiqihar City of Heilongjiang Province from April to June in 2003.MR was measured by using closed circuit respirometer,T b was measured by insertion of a digital thermometer into the cloaca,and C was calculated using the formula: C = MR /( T b T a),where T a is ambient temperature.With a temperature range of 5-35?℃,Siberian accentors can keep their T bs stable 41 25±0 12?℃.The mean minimum MR was 4 27±0 07 mL O 2/(g·h). C was 0 26±0 00 mL O 2/(g·h·℃) with a temperature range of 5-26 5?℃.Within this range of temperatures,MR increased with the declining in T a,and the relationship between MR and T a can be described as: MR [mL O 2/(g·h)]=10 39-0 24 T a (℃) for Siberian accentors.The ecophysiological characteristics of Siberian accentors were high level in MR and T b,relative higher in C .These properties might make them adapt to their environments and survive at relatively colder areas.
