Explaining adaptive shifts in body size on islands: a life history approach
Explaining adaptive shifts in body size on islands: a life history approach
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DOI：
10.1034/j.1600-0706.2003.12502.x
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发表时间：
2003-10
期刊：
影响因子：
3.4
通讯作者：
E. Palkovacs
中科院分区：
文献类型：
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作者：
E. Palkovacs
岛屿种群在体型上与大陆近亲存在差异的趋势已经得到了充分的记录，但这些体型变化的机制仍然是推测性的。通常的解释是基于生态相互作用，这种相互作用直接有利于体型的增加或减少。虽然很明显，直接的生态相互作用可以影响体型，但生活史的变化为观察到的跨系统发育群体和营养水平的岛屿大小趋势提供了另一种解释。在这里，我描述了资源可用性的减少和捕食压力的减少，以及之前假设所引发的同样的选择力，是如何通过生命史特征的进化来产生体型变化的。这种机制比以前的解释更普遍适用，并且与许多现有数据一致。
The tendency for island populations to differ in body size from their mainland relatives has been well documented, but the mechanisms for these size changes remain speculative. Explanations have typically been based on ecological interactions that directly favor either an increase or decrease in body size. While it is clear that direct ecological interactions can influence body size, life history shifts present an alternative explanation for observed insular size trends across phylogenetic groups and trophic levels. Here I describe how decreased resource availability and reduced predation pressure, the same selective forces invoked by previous hypotheses, can operate to produce body size changes via the evolution of life history traits. This mechanism is more generally applicable than previous explanations and is consistent with much of the available data.