The right size for a mammal

Andy Purvis; Paul H. Harvey

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The right size for a mammal

机译：适合哺乳动物的大小

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Elephants live slow lives, voles fast lives — vole populations maypass through 50 generations while an elephant grows up. Many facets of mammalian life history combine in this slow-fast continuum: species with long generation times produce small litter s of large off spr ing who wean late, mature late and live longer after maturity. Why do these components of life history co-vary as they do? In a paper in American Naturalist, Kozlowski and Weiner propose an elegant and comprehensive model of life-history evolution for animals, such as mammals, that stop growing when they reach reproductive maturity. Their model accords with the comparative patterns and may, as a bonus, resolve another knotty problem — the skewed frequency distribution of body sizes among species, whereby far more species are small than large (Fig, 1).

机译：大象过着慢速生活，田鼠过着快生活–大象长大时，田鼠种群可能会经过50代。哺乳动物生活史的许多方面都在这个缓慢而快速的连续过程中结合：具有长世代代的物种会产出大的小凋落物，它们断奶较晚，成熟较晚，并且在成熟后寿命更长。为什么生活史的这些组成部分会同时变化？ Kozlowski和Weiner在《美国自然主义者》上发表的一篇论文中，提出了一种优雅而全面的生活史进化模型，用于动物（如哺乳动物）在达到生殖成熟时便停止生长。他们的模型符合比较模式，并且可以解决一个棘手的问题，即物种间体型的频率分布偏斜，因此，小物种多于大物种（图1）。

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《Nature》 |1997年第6623期|p.332-333|共2页
作者
Andy Purvis; Paul H. Harvey;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种 eng
中图分类自然科学总论;
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The right size for a mammal

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