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首页> 外文期刊>Journal of great lakes research >An Analysis of Diversity in Freshwater Mussels (Bivalvia: Unionidae) of the Cuyahoga and Rocky River Watersheds (Ohio, USA) Based on the 16S rRNA Gene
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An Analysis of Diversity in Freshwater Mussels (Bivalvia: Unionidae) of the Cuyahoga and Rocky River Watersheds (Ohio, USA) Based on the 16S rRNA Gene

机译：基于16S rRNA基因的Cuyahoga和Rocky River流域（美国俄亥俄州）淡水贻贝（Bivalvia：Unionidae）的多样性分析

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The continued loss of freshwater unionid mussel species in the Great Lakes region, and particularly from Lake Erie, raises the question of how much phylogenetic and genetic variation remain in the watershed. The introduction of molecular markers into population biology offers one reproducible technique for assessing this variation. A fragment of the 16S rRNA gene of mitochondrial DNA has previously been used to infer phylogenetic relationships in the family Unionidae. Therefore, we reanalyzed these published molecular data with the addition of 12 species from the Cuyahoga and Rocky rivers in northeast Ohio. Both rivers drain to Lake Erie. The species assessed were Pyganodon grandis, Lasmigona complanata, Lasmigona compressa, Lampsilis radiata luteola, Fusconaia flava, Potamilus alatus, Strophi-tus undulatus, and Toxolasma parvus, for which published data were unavailable, and northern specimens of four wide ranging species, Lasmigona costata, Leptodea fragilis, Utterbackia imbecillis, and Quadrula quadrula. The resulting phylogenetic tree remained consistent with the accepted major taxo-nomic divisions in the Unionidae, and it indicates that these rivers still contain a phylogenetically diverse assemblage. However, the most abundant species all are members of the Anodontinae. Intraspecific variation in these unionid species was low, even where results were compared to published sequences on individuals from distant watersheds. One exception was a unique haplotype of Q. quadrula that differed at more base sites than is generally found for many congeneric species.
机译：大湖地区，特别是伊利湖地区淡水流产的贻贝贻贝物种的持续流失，提出了一个问题，即流域尚有多少系统发育和遗传变异。将分子标记引入人群生物学提供了一种可重现的技术，用于评估这种变异。线粒体DNA的16S rRNA基因的片段先前已被用来推断Unionidae家族的系统发育关系。因此，我们从俄亥俄州东北部的Cuyahoga河和Rocky河中添加了12种物种，从而重新分析了这些公开的分子数据。两条河流都流向伊利湖。评估的物种有大嘴y（Pyganodon grandis），长鳍金枪鱼（Lasmigona complanata），长鳍金枪鱼（Lasmigona compressa），辐射油菜（Lampsilis radiata luteola），黄褐藻（Fusconaia flava），大头菜（Patamilus alatus），无芒线虫（Strophi-tus undulatus）和弓形虫（Toxolasma parvus），这些物种的公布数据不可用，四个大范围物种的北部标本是长鳍金枪鱼，脆弱的Leptodea，Utterbackia imbecillis和Quadrula quadrula。形成的系统发育树与Unionidae中公认的主要分类学划分保持一致，这表明这些河流仍然包含系统发育多样的组合。但是，最丰富的物种都是Anodontinae的成员。即使将结果与已发表的关于远流域个体的序列进行比较，这些混种物种的种内变异也很低。一个例外是四方Q的独特单倍型，其碱基位置比许多同属物种普遍发现的多。

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