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首页> 外文期刊>Estuarine Coastal and Shelf Science >The response of macrofauna communities and shorebirds to macrophyte wrack subsidies on exposed sandy beaches of southern California
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The response of macrofauna communities and shorebirds to macrophyte wrack subsidies on exposed sandy beaches of southern California

机译：加利福尼亚南部裸露沙滩上大型动物群落和水鸟对大型植物残骸补贴的反应

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摘要

To investigate the influence of marine macrophyte wrack subsidies on community structure, relationships between community attributes, including species richness, abundance, and biomass of macrofauna and abundance of shorebirds, and a variety of factors, including the standing crop of wrack and beach morphodynamics, were examined on 15 exposed sandy beaches on the southern California coast. The beaches sampled were primarily modally intermediate morphodynamic types, and three were groomed regularly. Species richness, abundance, and biomass of the macrofauna were high compared to values reported for similar beach types in other regions and were not predicted by morphodynamics or other physical factors. Overall species richness and abundance, and the species richness, abundance, and biomass of wrack-associated fauna and selected taxa were significantly correlated with the standing crop of macrophyte wrack. Wrack-associated macrofauna, such as amphipods, isopods, and insects, made up an average of >37% of the species on ungroomed beaches and comprised 25% or more of the total abundance on half of those beaches. The abundance of two shorebird species, plovers that forage using visual cues, was positively correlated with the standing crop of wrack and with the abundance of wrack-associated invertebrates. Significant differences in community structure, including depressed species richness, abundance, and biomass of macrofauna, especially for wrack-associated taxa, were associated with beach grooming and provided strong evidence for the bottom-up effects of wrack subsidies. Grooming also reduced the prey available to vertebrate predators, such as shorebirds. Substantial ecological effects of the large-scale disturbance and removal of organic material, food resources, and habitat are associated with beach grooming. These results suggest that macrophyte wrack subsidies strongly influence macrofaunal community structure, higher trophic levels, and ecological processes on exposed sandy beaches. The supply of macrophyte wrack should be considered as a factor in ecological studies of exposed sandy beaches, particularly where macrophyte production is high.
机译：为了调查海洋大型植物残骸补贴对群落结构的影响，研究了群落属性之间的关系，包括物种丰富度，丰度，大型动物的生物量和滨鸟的丰富度，以及包括残骸的现存作物和海滩形态动力学在内的多种因素。在加利福尼亚南部海岸的15个裸露沙滩上进行了检查。所采样的海滩主要是中等形态动力类型，并定期进行了三处修饰。与其他地区类似海滩类型的报道值相比，大型动物的物种丰富度，丰度和生物量较高，并且形态动力学或其他物理因素无法预测。总的物种丰富度和丰度，以及与残骸相关的动物群和选定分类群的物种丰富度，丰度和生物量与大型植物残骸的现存作物显着相关。与残骸相关的大型动物，例如两栖类，等脚类动物和昆虫，在无毛化海滩上平均占该物种总数的> 37％，在这些海滩的一半中，占总丰富度的25％或以上。两种水鸟种类的丰富性，即利用视觉线索觅食的over，与现存的残骸数量以及与残骸相关的无脊椎动物的数量呈正相关。群落结构的显着差异，包括沮丧的物种丰富度，丰富度和大型动物的生物量，特别是与残骸相关的生物分类，与海滩整治有关，并为残骸补贴的自下而上效应提供了有力证据。梳理还减少了脊椎动物掠食性动物（例如shore）的猎物。大规模的生态干扰以及对有机物，食物资源和栖息地的去除对海滩的修饰具有重要意义。这些结果表明，大型植物残骸补贴对裸露的沙滩上的大型动物群落结构，较高的营养水平和生态过程有很大影响。在裸露的沙滩进行生态学研究时，应考虑到大型植物残骸的供应，特别是在大型植物的高产地区。

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