期刊
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
卷 147, 期 3, 页码 658-664出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpa.2006.08.024
关键词
neotropical marsupials; oxygen consumption; resting metabolic rate; body temperature; thermoregulation; wet thermal conductance; maximal sustained exercise
Oxygen consumption (VO2), body temperature (T-b) and wet thermal conductance (C-wet), under resting conditions, exposure to low ambient temperature (T-a) and during sustained exercise (treadmill running) were measured in three phylogenetic related (same family; Didelphidae) South American marsupials possessing similar body masses: Caluromys philander (arboreal/fruit and insect eating), Philander opossum (terrestrial and arboreal/onmivore), and Metachirus nudicaudatus (terrestrial/omnivore). Our measurements of VO2 and C-wet under resting conditions agree with those previously reported for other marsupials. We expected that C philander would show a lower maximal sustained VO2, compared to the other two species, based on its more reduced skeletal muscle mass. However, the values obtained for C philander were not statistically different (ANOVA) from those obtained for the other two species. When exposed to low ambient temperature (12 degrees C), differences among the three species were detected, i.e., M nudicaudatus did not survive, while the other two species were able to reduce their T-b under such conditions. C philander gradually decreases its T-b when cold exposed, and P opossum shows a more pronounced T-b drop only when exposure to low ambient temperatures occurs for a more prolonged period of time. (c) 2006 Elsevier Inc. All rights reserved.
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