The prevalence of asymmetrical indirect effects in two-host-one-parasitoid systems
The prevalence of asymmetrical indirect effects in two-host-one-parasitoid systems
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DOI：
10.1016/j.tpb.2004.04.001
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发表时间：
2004-08-01
影响因子：
1.4
通讯作者：
Abrams, PA
中科院分区：
文献类型：
--
作者：
Brassil, CE;Abrams, PA
对共同敌人间接影响的实证研究具有几个令人困惑的特点：（a）有文献记载的案例比通过共同资源相互作用的案例少得多;（B）大多数实证研究测量的间接影响是两个相互影响中的一个不能与零区分开来;（c）尽管有几种机制可以产生积极的效果，但缺乏记录在案的由共同敌人调解的积极效果。一个可能的解释是，这些是对潜在物种特征范围的统计预期。我们系统地研究了两个主机之间的间接相互作用与共享寄生在所有潜在的参数值，使用一个家庭的简单模型。通过包括非零种间效应的检测限，我们证明了宿主之间的（-，0）间接相互作用是模型的许多变体中最常见的类型。然而，实证研究中积极的间接效应的缺乏构成了一个令人困惑的不一致的经验和理论文献。(C)2004年爱思唯尔公司All rights reserved.
Empirical studies of indirect effects mediated by shared enemies have been characterized by several puzzling features: (a) there exist far fewer documented cases than for interactions via shared resources; (b) the majority of empirical studies have measured indirect effects where one of the two reciprocal effects could not be distinguished from zero; (c) there is a lack of documented positive effects mediated by a shared enemy, in spite of several mechanisms that could produce such effects. One potential explanation is that these are statistical expectations over the range of potential species characteristics. We systematically examine the indirect interactions between two hosts with a shared parasitoid across all potential parameter values, using a family of simple models. By including a detection limit for nonzero interspecific effects, we demonstrate that (-,0) indirect interactions between hosts are the most common type for many variants of the model. However, the absence of positive indirect effects in empirical studies constitutes a puzzling inconsistency between the empirical and theoretical literatures. (C) 2004 Elsevier Inc. All rights reserved.