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.
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]. , 2008, 28(3): 293-299.
WANG Xiaolin BAO Yixin LIU Jingsong CHEN Ting LIN Xiaorong. Characteristics of metabolic heat production and thermoregulation in Melano-bellied oriental voles (Eothenomys melanogaster). , 2008, 28(3): 293-299.