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原文連結
論文資訊
- 類型：已發表論文
- 日期：2011
摘要
The radiation of the mammals provides a 165-million-year test case for 演化ary theories of how 物種 occupy and then fill ecological niches. It is widely assumed that 物種 often diverge rapidly early in their 演化, and that this is followed by a longer, drawn-out period of slower 演化ary fine-tuning as 自然選擇 fits organisms into an increasingly occupied niche space(1,2). But recent studies have hinted that the process may not be so simple(3-5). Here we apply 統計 methods that automatically detect temporal shifts in the rate of 演化 through time to a comprehensive mammalian phylogeny(6) and data set(7) of body sizes of 3,185 extant 物種. Unexpectedly, the majority of mammal 物種, including two of the most speciose orders (Rodentia and Chiroptera), have no history of substantial and sustained increases in the ra
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