期刊
JOURNAL OF THERMAL BIOLOGY
卷 33, 期 6, 页码 324-331出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jtherbio.2008.04.002
关键词
Eothenomys miletus; Apodemus chevrieri; evaporative water loss; body temperature regulation
资金
- National Science Foundation of China [30260021, 30560026]
- Basilic Project of YunNan Province [2007C000Z1]
Evaporative water loss (EWL) and energy metabolism were measured at different temperatures in Eothenomys miletus and Apodemus chevrieri in dry air. The thermal neutral zone (TNZ) of E. miletus was 22.5-30 degrees C and that of A. chevrieri was 20-27.5 degrees C. Mean body temperatures of the two species were 35.75 +/- 0.5 and 36.54 +/- 0.61 degrees C. Basal metabolic rates (BMR) were 1.92 +/- 0.17 and 2.7 +/- 0.5mlO(2)/gh, respectively. Average minimum thermal conductance (C.) were 0.23 +/- 0.08 and 0.25 +/- 0.06mlO(2)/gh degrees C. EWL in E. miletus and A. chevrieri increased with the increase in temperature; the maximal EWL at 35 degrees C was 4.78 +/- 0.6mgH(2)O/gh in E. miletus, and 5.92 +/- 0.43mgH(2)O/gh in A. chevrieri. Percentage of evaporative heat loss to total heat production (EHL/HP) increased with the increase in temperature; the maximal EHL/HP was 22.45% at 30 degrees C in E. miletus, and in A. chevrieri it was 19.96% at 27.5 degrees C. The results may reflect features of small rodents in the Hengduan mountains region: both E. miletus and A. chevrieri have high levels of BMR and high levels of total thermal conductance, compared with the predicted values based on their body masses, while their body temperatures are relatively low. EWL plays an important role in temperature regulation. (c) 2008 Elsevier Ltd. All rights reserved.
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