Broad-scale patterns of invertebrate richness and community composition in temporary rivers: effects of flow intermittence
Broad-scale patterns of invertebrate richness and community composition in temporary rivers: effects of flow intermittence
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DOI：
10.1111/j.1600-0587.2013.00287.x
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发表时间：
2014-01-01
期刊：
影响因子：
5.9
通讯作者：
Santos, A. N.
中科院分区：
文献类型：
--
作者：
Datry, T.;Larned, S. T.;Santos, A. N.
临时河流是越来越常见的淡水生态系统，但一直没有全球综合的社区模式。在这项研究中，我们研究了水生无脊椎动物群落的流动阻力在14条河流从多个地理区域，涵盖了广泛的流动阻力和空间安排的常年和临时河段的反应。水文数据被用来描述流量梯度（FI，一年中没有地表水的比例）。线性混合效应模型被用来研究FI和群落结构和组成之间的关系。我们还测试，如果社区在最临时的网站是嵌套的子集社区在最临时和常年网站。分类丰富度下降，FI增加和无脊椎动物群落成为无处不在的类群占主导地位。弹性类群（具有高的传播能力）的数量随着FI的增加而减少，而抗性类群（适应干燥）的数量与FI无关。具体河流和河流平均模型的比较表明，大多数FI社区的关系并没有统计学上的差异河流。群落嵌套沿沿着FI梯度检测在大多数河流，有很少或没有影响的空间布局的常年和临时河段。这些结果表明，FI是一个主要的驱动程序的水生生物群落在临时河流，无论地理物种池。社区的反应主要是由于复原力，而不是抵抗机制。然而，与我们的预期相反，弹性并没有强烈的影响，空间碎片化模式，这表明，殖民者的来源比邻近的常年到达是重要的。
Temporary rivers are increasingly common freshwater ecosystems, but there have been no global syntheses of their community patterns. In this study, we examined the responses of aquatic invertebrate communities to flow intermittence in 14 rivers from multiple biogeographic regions covering a wide range of flow intermittence and spatial arrangements of perennial and temporary reaches. Hydrological data were used to describe flow intermittence (FI, the proportion of the year without surface water) gradients. Linear mixed-effects models were used to examine the relationships between FI and community structure and composition. We also tested if communities at the most temporary sites were nested subsets of communities at the least temporary and perennial sites. Taxon richness decreased as FI increased and invertebrate communities became dominated by ubiquitous taxa. The number of resilient taxa (with high dispersal capacities) decreased with increased FI, whereas the number of resistant taxa (with adaptations to desiccation) was not related to FI. River-specific and river-averaged model comparisons indicated most FI-community relationships did not differ statistically among rivers. Community nestedness along FI gradients was detected in most rivers and there was little or no influence of the spatial arrangement of perennial and temporary reaches. These results indicate that FI is a primary driver of aquatic communities in temporary rivers, regardless of the biogeographic species pool. Community responses are largely due to resilience rather than resistance mechanisms. However, contrary to our expectations, resilience was not strongly influenced by spatial fragmentation patterns, suggesting that colonist sources other than adjacent perennial reaches were important.