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原文連結
論文資訊
- 類型：已發表論文
- 日期：2015-04-06
摘要
The notion that large body size confers some intrinsic advantage to 生物 物種 has been debated for centuries. Using a 系統發育 統計 approach that allows the rate of body size 演化 to vary across a phylogeny, we find a long-term directional bias toward increasing size in the mammals. This pattern holds separately in 10 of 11 orders for which sufficient data are available and arises from a tendency for accelerated rates of 演化 to produce increases, but not decreases, in size. On a branch-bybranch basis, increases in body size have been more than twice as likely as decreases, yielding what amounts to millions and millions of years of rapid and repeated increases in size away from the small ancestral mammal. These results are the first evidence, to our knowledge, from extant 物種 that are compatible with Cop
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