The effects of habitat connectivity and regional heterogeneity on artificial pond metacommunities
The effects of habitat connectivity and regional heterogeneity on artificial pond metacommunities
复制标题
栖息地连通性和区域异质性对人工池塘元群落的影响
作者：
Michael T. Pedruski;S. Arnott
生境连通性和区域异质性是可能在不同空间尺度上影响生物多样性的两个因素。我们进行了一个3×2析因设计实验，以研究连通性、异质性及其相互作用在局域（α）、群落间（β）和区域（γ）尺度上对淡水无脊椎动物人工池塘群落的影响。尽管预期连通性的影响将取决于区域异质性的水平，但在任何空间尺度上对所研究的任何多样性指数都未发现显著的相互作用。虽然观察到的生物多样性对连通性和异质性的响应在某种程度上取决于所使用的多样性指数和空间划分公式，但总体模式表明，这些因素主要在β尺度上起作用，而不是在α或γ尺度上。我们得出结论，连通性在水生无脊椎动物群落中的主要作用是作为一种均质化力量，对α或γ水平的多样性影响相对较小。相反，异质性是一种维持群落间差异的力量。
Habitat connectivity and regional heterogeneity represent two factors likely to affect biodiversity across different spatial scales. We performed a 3 × 2 factorial design experiment to investigate the effects of connectivity, heterogeneity, and their interaction on artificial pond communities of freshwater invertebrates at the local (α), among-community (β), and regional (γ) scales. Despite expectations that the effects of connectivity would depend on levels of regional heterogeneity, no significant interactions were found for any diversity index investigated at any spatial scale. While observed responses of biodiversity to connectivity and heterogeneity depended to some extent on the diversity index and spatial partitioning formula used, the general pattern shows that these factors largely act at the β scale, as opposed to the α or γ scales. We conclude that the major role of connectivity in aquatic invertebrate communities is to act as a homogenizing force with relatively little effect on diversity at the α or γ levels. Conversely, heterogeneity acts as a force maintaining differences between communities.