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原文連結
論文資訊
- 類型：已發表論文
- 日期：2008
摘要
The distribution of 物種 body size within taxonomic groups exhibits a heavy right tail extending over many orders of magnitude, where most 物種 are much larger than the smallest 物種. We provide a simple model of clado遺傳 擴散 over 演化ary time that omits explicit mechanisms for interspecific competition and other micro演化ary processes, yet fully explains the shape of this distribution. We estimate the model's parameters from fossil data and find that it robustly reproduces the distribution of 4002 mammal 物種 from the late Quaternary. The observed fit suggests that the asymmetric distribution arises from a fundamental trade-off between the short-term selective advantages (Cope's rule) and long-term selective risks of increased 物種 body size in the presence of a taxon-specific lower limit on body size.
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