Hinds D S, Baudinette R V, MacMillen R E, Halpern E A
Department of Biology, California State University, Bakersfield 93309.
J Exp Biol. 1993 Sep;182:41-56. doi: 10.1242/jeb.182.1.41.
Minimum and maximum metabolism in response to cold were measured in 30 species of Australian monotremes, marsupials, eutherians and birds. In marsupials and the echidna, maximum metabolism was also determined during treadmill locomotion. These data were used to determine, for the first time, the relationships between maximum metabolism and body mass in the four endothermic groups and to compare aerobic factorial scopes (the ratio of maximum to minimum metabolism) elicited by cold and locomotion. The effect of body mass on maximum metabolism is the same in marsupials and eutherians (the therians) but is significantly less in birds. At the same body mass, there is no difference between the two therian groups for either minimum or maximum metabolism induced by either cold or locomotion. Aerobic scope during cold is significantly higher in marsupials (8.3) than in eutherians (5.1), birds (5.4) and monotremes (5.4). Aerobic scope during locomotion in all groups is almost twice that observed in cold conditions.
在30种澳大利亚单孔目动物、有袋类动物、真兽类动物和鸟类中测量了对寒冷的最低和最高代谢率。在有袋类动物和针鼹中，还测定了跑步机运动期间的最高代谢率。这些数据首次用于确定四个恒温动物群体中最高代谢率与体重之间的关系，并比较寒冷和运动引起的有氧因子范围（最高代谢率与最低代谢率之比）。体重对有袋类动物和真兽类动物（兽亚纲动物）的最高代谢率的影响相同，但对鸟类的影响明显较小。在相同体重下，两种兽亚纲动物群体在寒冷或运动诱导的最低或最高代谢率方面没有差异。有袋类动物在寒冷时的有氧范围（8.3）明显高于真兽类动物（5.1）、鸟类（5.4）和单孔目动物（5.4）。所有群体在运动时的有氧范围几乎是在寒冷条件下观察到的两倍。
