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首页> 外文期刊>Northeastern Naturalist >Freshwater Mussel (Bivalvia: Unionidae) Distributions and Habitat Relationships in the Navigational Pools of the Allegheny River, Pennsylvania
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Freshwater Mussel (Bivalvia: Unionidae) Distributions and Habitat Relationships in the Navigational Pools of the Allegheny River, Pennsylvania

机译：宾夕法尼亚州阿勒格尼河航行池中的淡水贻贝（双壳纲：Unionidae）分布和生境关系

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摘要

The main-stem Allegheny River is nationally recognized for its freshwater mussel (Unionidae: Bivalvia) diversity; however, habitat disturbance and degradation may have triggered the decline and loss of mussel communities in the lower river, where lock and dam structures restrict the free flow of water and sand and gravel removal threaten limited habitat. We examined mussel diversity and abundance across 75 transects throughout navigational pools and recorded 21 live native mussel species, including federally endangered Pleurobema clava (Clubshell) and Epioblasma torulosa rangiana (Northern Riffleshell) and several species with state endangered or threatened status. Riverine species richness and counts were significantly higher in the most-upstream portions of the upper pools, indicating that areas with consistent flows and suitable substrate just downstream of the dams may provide refugia for riverine freshwater mussel species. Sand, gravel, cobble, boulder, and organic debris had significant positive effects on riverine and facultative counts, while clay, bedrock, and woody debris had significant negative effects. Silt and woody debris had significant negative effects on riverine species richness, and sand and gravel had significant positive effects. These data will help identify sensitive areas for future protection and provide baseline data for monitoring future trends. The protection of relatively shallow areas with suitable substrates not yet impacted by dredging operations will be important to sustain remaining freshwater mussel populations in these pools.
机译：主干的阿勒格尼河以其淡水贻贝（Unionidae：Bivalvia）的多样性而享誉全国。但是，栖息地的扰动和退化可能引发了下游河流贻贝群落的减少和丧失，那里的闸门和水坝结构限制了水的自由流动，沙子和碎石的清除威胁了有限的栖息地。我们在整个航行池中检查了75个样带的贻贝多样性和丰度，并记录了21种活体原生贻贝物种，包括联邦濒危的Pleurobema clava（Clubshel​​l）和Epioblasma torulosa rangiana（Northern Riffleshell）以及几种处于州濒危或威胁状态的物种。在上游水库的最上游部分，河流物种的丰富度和数量显着较高，这表明水流一致且坝下游的合适底物的区域可能为河流淡水贻贝物种提供避难所。沙子，砾石，鹅卵石，巨石和有机碎片对河流和兼性计数有明显的积极影响，而粘土，基岩和木质碎片则有明显的负面影响。淤泥和木屑对河流物种丰富度具有显着的负面影响，而沙子和砾石则具有显着的正面影响。这些数据将帮助识别敏感区域以备将来保护，并提供基准数据以监视未来趋势。用尚未受挖泥作业影响的合适基质保护相对较浅的区域，对于维持这些池中剩余的淡水贻贝种群至关重要。

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