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北小麝鼩的代谢产热和体温调节特征

王子英, 管淑君,杨明,彭霞, 赵岩   

  1. 沈阳师范大学化学与生命科学学院,沈阳 110034
  • 出版日期:2010-05-27 发布日期:2010-03-02

The metabolic thermogenesis and thermoregulation of Lesser white- toothed shrew (Crocidura suaveolens)

WANG Ziying,GUAN Shujun,YANG Ming,PENG Xia,ZHAO Yan   

  1. Life Science and Chemistry College,Shenyang Normal University,Shenyang 110034,China
  • Online:2010-05-27 Published:2010-03-02

摘要: 为探讨食虫目小型哺乳动物的代谢产热和体温调节特征,本文采用封闭式流体压力呼吸仪测定了北小麝鼩在环境温度5 ~ 30℃下的静止代谢率(RMR),结果显示:在环境温度(Ta)为17 5 ~25℃ 的范围内,北小麝鼩的体温基本维持恒定,平均体温为36.55 ± 0.38℃ ;热中性区(TNZ) 为20 ~ 25℃ ;基础代谢率BMR 为5.46 ±0.23 (mLO2 /g· h),其中环境温度在25℃ 时静止代谢率最低,为4.84 ± 0.39 (mLO2 /g· h)。在5 ~ 25℃环境温度范围内,热传导值保持稳定;在此温度范围内,北小麝鼩的热传导率(C) 最低,平均为0.42 ± 0.01mLO2 / (g·h·℃ )。总之,北小麝鼩的产热和体温调节特征为较高的BMR,中等的热传导率,较低的体温和较宽的热中性区。这些特征可能与该物种体型小、夜行性、主要以无脊椎动物为食等生活习性密切相关。

关键词: 北小麝鼩, 静止代谢率, 体温调节, 热传导, 热中性区

Abstract: To investigate the characteristics of metabolic thermogenesis and thermoregulation in small mammals,the restingmetabolic rate (RMR)of Lesser white-toothed shrew (Crocidura suaveolens)was measured at 5 -30℃ using a closed circuit respirometer. Our results showed that: Lesser white-toothed shrew could keep a stable body temperature of 36.55 ±0.38℃ at ambient temperatures (Ta )between 17.5 -25℃. The thermal neutral zone (TNZ) was 20 - 25℃. Mean basal metabolic rate BMR was 5.46 ±0.23 (mLO2 / g· h). The lowest BMR was 4.84 ± 0.39 (mLO2 / g· h) at Ta 25℃. The thermal conductance (C)within a temperature range of 5 - 25℃ was stable. Within a temperature range of 5 - 25℃ ,the shrews had a low heat conduction with an average result of 0.42 ± 0.01 mLO2 /(g·h·℃ ). In conclusion,Lesser whitetoothed shrews had a higher BMR,a moderate thermal conductance,a lower body temperature and a wide range of TNZ as characteristics of thermogensis and thermoregulation. These characteristics closely related to the small size,nocturnal and
invertebrate-eating habits.

Key words: Lesser white-toothed shrew (Crocidura suaveolens), Resting metabolic rate (RMR), Thermoregulation, Thermal conductance, Thermal neutral zone (TNZ)