Apparent competition structures ecological assemblages
Apparent competition structures ecological assemblages
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DOI：
10.1038/41084
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发表时间：
1997-07-24
期刊：
影响因子：
64.8
通讯作者：
Hassell, MP
中科院分区：
文献类型：
--
作者：
Bonsall, MB;Hassell, MP
竞争是构建生态群落的主要力量（1）。它直接（2）或间接地起作用，在这种情况下，它可能通过共同的天敌介导，被称为“明显的竞争”（3-6）。明显竞争对物种共存的影响在理论上是众所周知的（7，8），但以前没有在控制的多代实验中得到经验证明。在这里，我们报告在实验室昆虫系统与两个主机种和一个共同的寄生蜂攻击他们的明显竞争的人口动态后果。我们发现，而两个单独的，单一的主机，单寄生虫的相互作用是持久的，三种系统与寄生虫攻击两个主机物种（不允许直接竞争）是不稳定的，和主机物种之一是消除的相互作用，由于明显的竞争的影响。
Competition is a major force in structuring ecological communities(1). It acts directly(2) or indirectly, in which case it maybe mediated by shared natural enemies and is known as 'apparent competition'(3-6). The effects of apparent competition on species coexistence are well known theoretically(7,8) but have not previously been demonstrated empirically in controlled multigenerational experiments. Here we report on the population dynamic consequences of apparent competition in a laboratory insect system with two host species and a common parasitoid attacking them. We find that whereas the two separate, single host-single parasitoid interactions are persistent, the three-species system with the parasitoid attacking both hosts species (which are not allowed to compete directly) is unstable, and that one of the host species is eliminated from the interaction owing to the effects of apparent competition.