The effects of colonization, extinction and competition on co-existence in metacommunities
The effects of colonization, extinction and competition on co-existence in metacommunities
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DOI：
10.1111/j.1365-2656.2009.01532.x
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发表时间：
2009-07-01
影响因子：
4.8
通讯作者：
Bonsall, Michael B.
中科院分区：
文献类型：
--
作者：
Hunt, Julia J. F. G.;Bonsall, Michael B.
竞争者在异质景观中的共存依赖于定殖、灭绝和空间尺度的过程。在这项研究中，我们探索了竞争相互作用的集合种群动态，而不是简单地以传统的方式评估种间竞争的结果，我们关注的是当地种群动态效应和影响物种共存的区域集合种群过程。我们建立了一个区域共存的理论模型，以产生一组关于共存所需的殖民模式的预测。存在和可能导致竞争排斥的区域进程。我们用两只豆象之间相互作用的后趋性微观世界来实证检验这些预测（Callosobruchus chinensis，Callosobruchus maculatus）。利用重复性好的豆象之间相互作用的时间序列和模型拟合的统计方法，我们展示了豆象甲虫之间种间竞争的定性和定量模式是如何由定界性结构形成的。在无限扩散定界性中，劣势竞争者的全球排斥被证明更多地受到与灭绝相关的过程的影响，而不是低定殖能力。在有限的扩散metacquitities，我们展示了如何共存的竞争对手在一个空间异质性的栖息地（补丁连接通过有限的扩散）是受Allee效应和生活史[殖民（扩散）竞争]权衡。
The co-existence of competitors in heterogeneous landscapes depends on the processes of colonization, extinction and spatial scale. In this study, we explore the metapopulation dynamics of competitive interactions.Rather than simply evaluating the outcome of interspecific competition in the traditional manner, we focus on both the local population dynamic effects and the regional metapopulation processes affecting species co-existence.We develop a theoretical model of regional co-existence to generate a set of predictions on the patterns of colonization necessary for co-existence and the regional processes that can lead to competitive exclusion. We empirically test these predictions using metacommunity microcosms of the interaction between two bruchid beetles (Callosobruchus chinensis, Callosobruchus maculatus).Using well-replicated time series of the interaction between the bruchids and statistical methods of model fitting, we show how the qualitative and quantitative pattern of interspecific competition between the bruchid beetles is shaped by the structure of the metacommunity.In unlimited dispersal metacommunities, the global exclusion of the inferior competitor is shown to be influenced more by the processes associated with extinction rather than low colonization ability. In restricted dispersal metacommunities, we show how the co-existence of competitors in a spatially heterogeneous habitat (patches connected through limited dispersal) is affected by Allee effects and life-history [colonization (dispersal) - competition] trade-offs.