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首页> 外文期刊>Limnologica >Dispersal capacity and broad-scale landscape structure shape benthic invertebrate communities along stream networks
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Dispersal capacity and broad-scale landscape structure shape benthic invertebrate communities along stream networks

机译：沿着流网络的分散能力和宽尺寸景观结构形状底栖无脊椎动物群落

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摘要

Dispersal is a fundamental trait influencing species' distribution patterns and metacommunity structure. Yet, for stream communities it remains unclear how communities differ in dispersal capacity. Due to the dendritic network structure of streams and the greater spatial variability in environmental conditions in headwaters than in mainstems, we asked three main questions: 1) Do benthic invertebrates inhabiting headwaters have lower community-wide dispersal capacities (DCc) on average than those living in mainstems? 2) In turn, does the degree of community dissimilarity among sites differ between the different locations in the river network? 3) Are these differences more pronounced in highland streams compared to lowland streams as a consequence of major landscape features (i.e. mountains)? To examine these questions, we compiled 1466 benthic invertebrate samples across the southern highland and northern lowland areas of Germany. Results showed that overall DCc increased with stream size in both highland and lowland streams. In highland streams, higher DCc in mainstems was associated with more homogeneous communities compared to headwater communities. However, this pattern did not occur in lowland streams. This suggests that both dispersal capacity and landscape structure interact to determine community structure in these networks. Our results therefore stress the importance of considering dispersal traits and landscape features, as well as habitat control (or environmental filtering) to better understand (meta-) community structure across various landscape types.
机译：分散是影响物种分布模式和地区结构的基本特征。然而，对于流社区来说，尚不清楚社区在分散能力方面的不同。由于流的树枝状网络结构和兽境中的环境条件中的空间变异性比在主干中，我们提出了三个主要问题：1）底栖无脊椎动物栖息地具有较低的群众宽阔的分散能力（DCC），平均而不是那些生活在主干？ 2）反过来，位点之间的社区不同程度不同的是河流网络中不同地点之间的不同之处吗？ 3）与主要景观特征（即山）的后果相比，高地溪流中的差异是在高地溪流中更明显的吗？为了审查这些问题，我们编制了德国南部高地和北部低地地区的1466个底栖无脊椎动物样本。结果表明，总体DCC在高地和低地流中的流尺寸增加。在高地溪流中，与地下社区相比，主干中的高达DCC与更均匀的社区有关。但是，在低地流中没有发生这种模式。这表明分散能力和景观结构都相互作用，以确定这些网络中的社区结构。因此，我们的结果强调了考虑分散性状和景观特征的重要性，以及栖息地控制（或环境过滤）以更好地了解（Meta-）社区结构，各种景观类型。

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