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原文連結
論文資訊
- 類型：已發表論文
- 日期：2009
摘要
Within large taxonomic assemblages, the number of 物種 with adult body mass M is characterized by a broad but asymmetric distribution, with the largest mass being orders of magnitude larger than the typical mass. This canonical shape can be explained by clado遺傳 擴散 that is bounded below by a hard limit on viable 物種 mass and above by extinction risks that increase weakly with mass. Here we introduce and analytically solve a simplified clado遺傳 擴散 model. When appropriately parameterized, the 擴散-reaction equation predicts mass distributions that are in good agreement with data on 4,002 terrestrial mammals from the late Quaternary and 8,617 extant bird 物種. Under this model, we show that a specific trade-off between the strength of within-lineage drift toward larger masses (Cope's rule) and the inc
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