Dendritic connectivity controls biodiversity patterns in experimental metacommunities
Dendritic connectivity controls biodiversity patterns in experimental metacommunities
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DOI：
10.1073/pnas.1119651109
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发表时间：
2012-04-10
影响因子：
11.1
通讯作者：
Rinaldo, Andrea
中科院分区：
文献类型：
--
作者：
Carrara, Francesco;Altermatt, Florian;Rinaldo, Andrea
生物群落通常出现在空间结构化的生境中，在那里，连通性直接影响扩散和迁移过程。最近的理论研究表明，扩散受到特定栖息地结构的连接性的限制，例如像河流网络这样的树突，可以解释观察到的生物多样性特征，但仍然缺乏直接的证据。我们的实验表明，连通性本身的形状多样性模式在不同层次的微观元生态。在各向同性晶格景观的本地分散均匀的本地物种丰富度，并导致显着的空间持久性。相反，分散沿着树枝景观导致更高的变异性，在当地的多样性和植物群落组成。虽然水源的物种丰富度相对较低，但它们对维持区域生物多样性至关重要。我们的研究结果表明，空间约束的树突连接是社区组成和人口持久性的一个关键因素。
Biological communities often occur in spatially structured habitats where connectivity directly affects dispersal and metacommunity processes. Recent theoretical work suggests that dispersal constrained by the connectivity of specific habitat structures, such as dendrites like river networks, can explain observed features of biodiversity, but direct evidence is still lacking. We experimentally show that connectivity per se shapes diversity patterns in microcosm metacommunities at different levels. Local dispersal in isotropic lattice landscapes homogenizes local species richness and leads to pronounced spatial persistence. On the contrary, dispersal along dendritic landscapes leads to higher variability in local diversity and among-community composition. Although headwaters exhibit relatively lower species richness, they are crucial for the maintenance of regional biodiversity. Our results establish that spatially constrained dendritic connectivity is a key factor for community composition and population persistence.