Symonds Matthew R E, Elgar Mark A
Department of Zoology, University of Melbourne, Victoria 3010, Australia.
Evolution. 2002 Nov;56(11):2330-3. doi: 10.1111/j.0014-3820.2002.tb00156.x.
The relationship between body size and metabolic rate is a crucial issue in organismal biology and evolution. There has been considerable debate over whether the scaling exponent of the relationship is 0.75 (Kleiber's Law) or 0.67. Here we show that determination of this exponent for mammals depends on both the evolutionary tree and the regression model used in the comparative analysis. For example, more recent molecular-based phylogenies tend to support a 0.67 exponent, whereas older phylogenies, mostly based on morphological data, suggest a 0.75 exponent. However, molecular phylogenies yield more variable results than morphological phylogenies and thus are not currently helping to resolve the issue.
体型与代谢率之间的关系是生物生物学和进化领域的一个关键问题。关于这种关系的标度指数是0.75（克莱伯定律）还是0.67，一直存在着相当大的争论。在这里，我们表明，哺乳动物这个指数的确定取决于进化树和比较分析中使用的回归模型。例如，基于分子的更新的系统发育往往支持0.67的指数，而较旧的系统发育，大多基于形态学数据，表明是0.75的指数。然而，分子系统发育产生的结果比形态学系统发育更具可变性，因此目前无助于解决这个问题。
