互惠生态系统中的系统发生邻近性和嵌套性
Phylogenetic Proximity and Nestedness in Mutualistic Ecosystems
摘要：
我们研究了互惠生态系统中物种之间的接触模式是如何受到每个公会物种之间的系统发育接近性的影响。我们开发了一些理论工具来衡量这种影响，我们用它们来检查一些真正的互惠系统。我们的目标是确定这种接近在出现嵌套式接触模式中的作用。我们的结论是，虽然系统发育的接近是兼容的嵌套它不能被要求确定it.We发现，嵌套，而不是可以归因于一个一般的规则，物种往往表现为通才持有与同行的联系，已经有大量的接触。由这一规则产生的巢状生态系统显示出高度的系统发育多样性。这就是说，具有相似度的物种的对应物不是系统发育的邻居。
英文摘要：
We investigate how the pattern of contacts between species in mutualistic ecosystems is affected by the phylogenetic proximity between the species of each guild. We develop several theoretical tools to measure that effect and we use them to examine some real mutualistic sytems. We aim at establishing the role of such proximity in the emergence of a nested pattern of contacts. We conclude that although phylogenetic proximity is compatible with nestedness it can not be claimed to determine it. We find that nestedness can instead be attributed to a general rule by which species tend to behave as generalists holding contacts with counterparts that already have a large number of contacts. A nested ecosystem generated by this rule, shows high phylogenetic diversity. This is to say, the counterparts of species having similar degrees are not phylogenetic neighbours.
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