River network properties shape α-diversity and community similarity patterns of aquatic insect communities across major drainage basins
River network properties shape α-diversity and community similarity patterns of aquatic insect communities across major drainage basins
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DOI：
10.1111/jbi.12178
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发表时间：
2013-12-01
影响因子：
3.9
通讯作者：
Martinez, Nicolas
中科院分区：
文献类型：
--
作者：
Altermatt, Florian;Seymour, Mathew;Martinez, Nicolas
目的空间动态和生境连通性影响着许多生态系统的群落组成和多样性。几十年来，河流生态系统的多样性模式被认为与当地的环境条件有关。然而，最近的理论工作表明，河流的多样性受到沿树突状景观结构扩散的强烈影响，并且环境条件与网络位置具有内在联系。在本研究中，我们通过将河流网络的几何形状和连通性与大尺度上多层次的生物多样性格局联系起来，检验了关于网络位置的假设。研究了瑞士的三个主要高山流域（莱茵河，罗纳河，提契诺河），海拔梯度为bbb2500m，总面积为41285 km(2)。方法在3个河网的217个地点采集了所有的石蝇、石蝇和石蝇。利用广义加性模型，我们将水生昆虫的多样性模式与作为直接河网属性的河网内的中心性以及与河网位置相关的集水区面积和海拔高度联系起来。结果河网内的中心度、流域面积和海拔高度对群落多样性和相似性具有显著的交互影响。α多样性在外围水源和高海拔地区最低。物种丰富度总体上随流域面积的增加而增加。河网内连接良好的中心社区比周边社区具有更大的多样性。海拔高度是物种多样性的重要预测因子，在海拔中等的地点发现了最多样化的群落。群落相似性随站点间沿流距离的增加而降低。研究结果表明，水系水生昆虫的多样性格局与海拔等局地因素有关，但与水道的网络特性和连通性相互作用，且昆虫目之间存在差异。这些发现与分散限制过程一致，表明应在考虑河网结构的情况下处理和保护河流多样性。
AimSpatial dynamics and habitat connectivity affect community composition and diversity in many ecosystems. For many decades, diversity patterns in riverine ecosystems were thought to be related to local environmental conditions. Recent theoretical work, however, suggests that diversity in rivers is strongly affected by dispersal along the dendritic landscape structure and that environmental conditions are intrinsically linked to the network position. In this study we tested hypotheses on network position by relating river network geometry and connectivity to multi-level biodiversity patterns across large scales.LocationThree major alpine drainage basins in Switzerland were studied (Rhine, Rhone, Ticino), extending over an elevational gradient of >2500m and covering a total area of 41,285km(2).MethodsWe sampled all may-, stone- and caddisfly species at 217 sites which representatively cover the three river networks. Using generalized additive models, we related diversity patterns in aquatic insects to centrality within the network as a direct river network property, and to catchment area and elevation, which are related to network position.ResultsCentrality within the river network, and catchment area and elevation had significant and interacting effects on -diversity and community similarity. Alpha diversity was lowest in peripheral headwaters and at high elevations. Species richness generally increased with increasing catchment area. Well-connected, central communities within the river network had greater -diversity than more peripheral communities did. Elevation was a strong predictor of -diversity, with the most diverse communities found at mid-elevation sites. Community similarity decreased with increasing along-stream distance between sites.Main conclusionsOur results highlight the fact that diversity patterns of aquatic insects in river systems are related to local factors such as elevation, but interact with network properties and connectivity along waterways, and differ among insect orders. These findings are consistent with dispersal-limited processes and indicate that riverine diversity should be addressed and protected taking the river network structure into account.