Community assembly along a species pool gradient: implications for multiple-scale patterns of species diversity
Community assembly along a species pool gradient: implications for multiple-scale patterns of species diversity
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DOI：
10.1007/s10144-004-0182-z
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发表时间：
2004-08-01
影响因子：
1.7
通讯作者：
Fukami, T
中科院分区：
文献类型：
--
作者：
Fukami, T
不同的生态过程在多个空间尺度上影响物种多样性的格局。一个可能很重要但很少考虑的过程是社区集会。我组装模型社区使用不同大小的物种池来研究社区组装的历史可能会影响多尺度多样性模式。该模型包含三个尺度，在该尺度上可以测量多样性：当地社区，metacrobustity和物种库。当地物种饱和发生，预期从竞争和捕食模型中建立。然而，当地社区并没有成为抵抗入侵，除非物种库非常小。根据扩散率和营养水平，物种库越大，就越难预测哪个物种在给定时间入侵哪个当地社区。因此，本地社区的差异保持组装历史与池的大小线性增加，即使本地多样性是解耦的池的大小。这些结果有两个多尺度多样性模式的影响。首先，组装历史可以解释当地和区域多样性之间的规模依赖关系：组装导致的关系是曲线在一个规模（当地社区），而在另一个线性（元共生）。其次，组装历史影响了伽马多样性如何划分为α多样性和β多样性：组装导致β多样性的相对贡献随池大小而增加。总体而言，这项研究表明，社区组装历史与物种池大小相互作用，以调节多尺度模式的物种多样性。
Various ecological processes influence patterns of species diversity at multiple spatial scales. One process that is potentially important but rarely considered is community assembly. I assembled model communities using species pools of differing size to examine how the history of community assembly may affect multi-scale diversity patterns. The model contained three scales at which diversity could be measured: local community, metacommunity, and species pool. Local species saturation occurred, as expected from the competition and predation built in the model. However, local communities did not become resistant to invasions except when the species pool was very small. Depending on dispersal rate and trophic level, the larger the species pool, the harder it was to predict which species invades which local community at a given time. Consequently, local-community dissimilarity maintained by assembly history increased linearly with pool size, even though local diversity was decoupled from pool size. These results have two implications for multi-scale diversity patterns. First, assembly history may provide an explanation for scale-dependent relationships between local and regional diversity: assembly causes the relationship to be curvilinear at one scale (local community), while linear at another (metacommunity). Second, assembly history influences how gamma-diversity is partitioned into alpha- and beta-diversity: assembly causes the relative contribution of beta to increase with pool size. Overall, this study suggests that community assembly history interacts with species pool size to regulate multi-scale patterns of species diversity.