Increased competition does not lead to increased phylogenetic overdispersion in a native grassland
Increased competition does not lead to increased phylogenetic overdispersion in a native grassland
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DOI：
10.1111/ele.12153
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发表时间：
2013-09-01
期刊：
影响因子：
8.8
通讯作者：
Cahill, James F., Jr.
中科院分区：
文献类型：
--
作者：
Bennett, Jonathan A.;Lamb, Eric G.;Cahill, James F., Jr.
在群落生态学中，近亲物种之间的竞争更激烈，从而导致系统发育的过度分散是一个普遍的假设。然而，对这一假设的测试很少，而且缺乏实地实验。通过实验和野外调查，研究了植物间竞争、亲缘度和过度分散之间的关系。亲缘关系不影响竞争，竞争也与系统发育过度分散无关。此外，只有微弱的证据表明，在植物可能竞争的空间尺度上，过度分散增加了。这些结果挑战了传统理论，但与最近关于植物竞争机制及其对系统发育结构的潜在影响的理论一致。我们认为，竞争导致系统发育过度分散必须满足与竞争形式和性状保守性相关的特定条件。因此，由于竞争而导致的过度分散在自然群落中很可能是罕见的。
That competition is stronger among closely related species and leads to phylogenetic overdispersion is a common assumption in community ecology. However, tests of this assumption are rare and field-based experiments lacking. We tested the relationship between competition, the degree of relatedness, and overdispersion among plants experimentally and using a field survey in a native grassland. Relatedness did not affect competition, nor was competition associated with phylogenetic overdispersion. Further, there was only weak evidence for increased overdispersion at spatial scales where plants are likely to compete. These results challenge traditional theory, but are consistent with recent theories regarding the mechanisms of plant competition and its potential effect on phylogenetic structure. We suggest that specific conditions related to the form of competition and trait conservatism must be met for competition to cause phylogenetic overdispersion. Consequently, overdispersion as a result of competition is likely to be rare in natural communities.