THE EFFECTS OF BODY MASS, PHYLOGENY, HABITAT, AND TROPHIC LEVEL ON MAMMALIAN AGE AT FIRST REPRODUCTION
THE EFFECTS OF BODY MASS, PHYLOGENY, HABITAT, AND TROPHIC LEVEL ON MAMMALIAN AGE AT FIRST REPRODUCTION
复制标题
体重、系统发育、栖息地和营养水平对哺乳动物首次繁殖年龄的影响
DOI：
--
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
J. Wootton
中科院分区：
文献类型：
--
作者：
J. Wootton
我研究了547种哺乳动物的首次繁殖年龄，以确定饮食和栖息地对生活史特征进化的影响。体重与第一次生育的年龄正相关，解释了56%的差异。生境和营养类群显著偏离异速生长曲线，其模式与r/K选择理论及其修正的预测基本一致。然而，哺乳目与异速生长曲线也存在显著偏差，不同生境和饮食组所含哺乳目的比例也存在差异。当去除目的影响后，各生态类群间的剩余偏差没有差异。调整生态差异并没有消除不同目之间的差异。这些结果表明，体重（或一些相关因素）和系统发育强烈地限制了首次生殖的年龄。生态因素似乎对初次繁殖年龄的进化影响不大。生境和营养类群中首次繁殖时体重比年龄的明显差异可能是当前生态选择的结果，而不是过去生态驱动的生活史进化的结果。
I examined age at first reproduction of 547 mammalian species to determine the influence of diet and habitat on the evolution of life‐history traits. Body mass correlated positively with age at first reproduction, explaining 56% of the variance. Habitat and trophic groups deviated significantly from the allometric curve in a pattern generally consistent with predictions from r/K selection theory and its modifications. However, mammalian orders also deviated significantly from the allometric curve, and different habitat and diet groups contained different ratios of mammalian orders. When the effects of orders were removed, residual deviations did not differ among ecological groups. Adjusting for ecological differences did not eliminate the differences between orders. These results suggest that body mass (or some correlated factor) and phylogeny strongly constrain age at first reproduction. Ecological factors appear to have little effect on the evolution of age at first reproduction. Apparent differences in weight‐specific ages at first reproduction within habitats and trophic groups may be the result of ecological selection of order composition in the present, rather than ecologically driven evolution of life history in the past.