黑腹绒鼠的代谢产热特征及其体温调节

黑腹绒鼠的代谢产热特征及其体温调节

汪晓琳鲍毅新柳劲松陈挺林笑蓉

浙江师范大学生态研究所,金华321004

出版日期:2008-10-09 发布日期:2008-07-07

Characteristics of metabolic heat production and thermoregulation in Melano-bellied oriental voles (Eothenomys melanogaster)

WANG Xiaolin BAO Yixin LIU Jingsong CHEN Ting LIN Xiaorong

Institute of Ecology ,Zhejiang Normal University,Jinhua 321004,China

Online:2008-10-09 Published:2008-07-07

摘要/Abstract

摘要： 为探讨东洋界华中区黑腹绒鼠的代谢产热特征及体温调节,本文采用封闭式流体压力呼吸仪对其代谢率、热传导和体温等热生物学指标进行了测定。结果显示:在环境温度为5 ～25℃ 的范围内,黑腹绒鼠的体温基本维持恒定,平均体温为36.5 ± 0.1℃ ;热中性区为25 ～30℃ ;基础代谢率为2.99 ± 0.09 ml O₂ /(g· h);环境温度(Ta)在5 ～ 25℃ 范围内,代谢率(MR)与Ta 呈负相关,回归方程为:MR[ml O₂ / (g· h)]= 6.56 - 0.16 Ta(℃ ),在此范围内,黑腹绒鼠的热传导率C 最低,平均为0.26 ± 0. 01 ml O2 / (g· h· ℃ )。黑腹绒鼠的基本热生物学特征为:较高的BMR、热传导率和体温以及较宽的热中性区。

关键词: 黑腹绒鼠基础代谢率体温调节

Abstract: To understand the ecophysiological characteristics of Melano-bellied oriental vole (Eothenomys melanogaster) inhabiting the central China region of Oriental realm,we measured their metabolic rates,body temperatures (Tb),and thermal conductances in a range of temperatures (5 - 35℃ ). Eight animals were used in the experiment. Their average body mass was 28.17 ± 0.35 g (mean ± SE). The animals were kept in large cages under natural temperature and photoperiod, and fed with laboratory ‘rat chow’pellets for a week (comments:exact number of days here). Food and water were available ad libitum. The metabolic rates of the animals were measured using a respirometer in a chamber with a constant temperature (0.5℃ ). The body masses (Mb)and body temperature (Tb)of the animals were measured before and after each measurement. Tb was measured by insertion of a digital thermometer into the rectum at a depth of 3 cm. Prior to each measurement,the animal was fasted for three hours to minimize food interference. Each measurement lasted for one hour. Measurements were taken daily between 9:00 and 17:00 for twenty days. Metabolic rates were expressed as ml O₂ / g· h. Thermal conductance (C,in ml O₂/ (g· h· ℃ )was calculated at each temperature below the thermal neutral zone using the formula:C = MR/ (Tb - Ta),where MR refers to the metabolic rate (ml O₂/ g· h),Tb is body temperature (℃ ) and Ta is ambient temperature (℃ ). The results showed that the mean basal metabolic rate within the neutral temperature region (25 - 30℃ )was 2.99 ±0.09 ml O₂/ (g· h). When amibient temperature was between 5 and 25℃ ,Melano-bellied oriental voles can maintain a stable body temperature at 36.5 ± 0.1℃ . Total thermal conductance (C)in the temperature range of 5 - 25℃ was 0.26 ±0.01 ml O₂ / (g· h· ℃ ). When the ambient temperature was below the neutral temperature region,the metabolic rate (MR)increased with decline in ambient temperature. The relationship between MR and Ta can be described using the equation,MR (ml O₂/ g· h) = 6. 56 - 0.16 Ta (℃ ). Our results provide basic characteristics of melano-bellied oriental voles in metabolic heat production and thermal regulation.

Key words: Basal metabolic rate (BMR) Melano-bellied oriental vole (Eothenomys melanogaster) Thermoregulation

汪晓琳鲍毅新柳劲松陈挺林笑蓉. 黑腹绒鼠的代谢产热特征及其体温调节[J]. .

WANG Xiaolin BAO Yixin LIU Jingsong CHEN Ting LIN Xiaorong. Characteristics of metabolic heat production and thermoregulation in Melano-bellied oriental voles (Eothenomys melanogaster)[J]. .