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首页> 外文期刊>Aquatic Conservation: Marine and Freshwater Ecosystems >Patterns in species richness and assemblage structure of native mussels in the Upper Mississippi River
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Patterns in species richness and assemblage structure of native mussels in the Upper Mississippi River

机译：密西西比河上游原生贻贝的物种丰富度和组合结构

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摘要

1. To evaluate patterns in mussel assemblages in the Upper Mississippi River (UMR), data from systematic surveys of mussels conducted in three large reaches (Navigation Pools 5, 6, and 18) from 2005-2007 were analysed. 2. Nonmetric multi-dimensional scaling analyses and permutation tests indicated that assemblages differed among reaches. The mussel assemblage in Pool 18 was substantially different from the assemblage in Pool 5 and moderately different from the assemblage in Pool 6, whereas assemblages in Pools 5 and 6 were similar. Assemblages in broadly defined, flowing aquatic habitats did not substantially differ. 3. The dissimilarity of Pool 18 was primarily the result of Pool 18 having higher abundances of three Quadrula species (Q. quadrula, Q. pustulosa, and Q. nodulata), and lower abundances of Amblema plicata and Fusconaia flava. 4. Rarefaction analyses showed that species richness and species density were higher in Pool 18 compared with the other two pools. 5. Large-scale patterns in mussel assemblages may be related to other longitudinal trends in the system including geomorphology, water quality, and abundances of fish species that serve as hosts for glochidial larvae. 6. The results suggest that management goals and actions in the UMRmay need to account for important differences in mussel assemblages that occur among reaches.
机译：1.为了评估密西西比河上游（UMR）贻贝组合的模式，分析了2005-2007年在三个大河段（导航池5、6和18）进行的贻贝系统调查数据。 2.非度量多维标度分析和置换测试表明，各个流域的组合有所不同。池18中的贻贝组合与池5中的组合实质上不同，并且与池6中的组合略有不同，而池5和6中的组合相似。在广泛定义的，流动的水生生境中的组合没有很大的不同。 3.池18的不同主要是由于池18具有三种Quadrula物种（Q. quadrula，Q。pustulosa和Q. nodulata）的丰度较高，而Amblema plicata和Fusconaia flava的丰度较低的结果。 4.反射分析表明，池18中的物种丰富度和物种密度高于其他两个池。 5.贻贝组合的大规模格局可能与系统中的其他纵向趋势有关，包括地貌，水质和作为线虫幼虫宿主的鱼类种类丰富。 6.结果表明，UMR中的管理目标和行动可能需要考虑河段之间贻贝组合的重要差异。

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