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A unified assessment of marine Mediterranean assemblages: a lesson from benthic hydroids

机译：对地中海海洋组合的统一评估：来自底栖水体的教训

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摘要

Hydroids are important components of the communities of rocky bottom shallow coastal areas. The hydrozoan fauna of the Mediterranean Sea is probably one of most investigated in the world, with lots of faunistic and biogeographical studies. However, quantitative studies using the same sampling methodology and controlled sampling effort have been restricted to areas in the Western and Central Mediterranean. We compared hydroid assemblages in four areas of the Mediterranean Sea, from the Gulf of Cádiz to the South Adriatic Sea, following the same sampling and quantification methodology. Our analysis showed the dominant Atlantic character of the assemblages of the Gulf of Cádiz and the South Alboran Sea because of the influence of the inflowing Atlantic waters. Conversely, the hydroid assemblages of the North Alboran Sea were more similar to the assemblages in the Ligurian and in the South Adriatic, and with a number of species ranking between the observed in these two Mediterranean zones. Fourteen species were identified as making the most significant contributions to characterizing the Mediterranean hydroid species pool from a quantitative point of view. These taxa include species previously named as typical components of the Mediterranean hydroid fauna as well as those only recently recorded in the region (Eudendrium moulouyensis) and invaders such as Clytia hummelincki.
机译：积水是岩石底浅沿海地区群落的重要组成部分。地中海的水生动物区系可能是世界上研究最多的动物区系之一，具有大量的动物学和生物地理学研究。但是，使用相同的抽样方法和可控的抽样工作进行的定量研究仅限于地中海中西部地区。我们按照相同的采样和定量方法，比较了从加的斯湾到南亚得里亚海的地中海四个地区的水合物组合。我们的分析表明，由于流入大西洋的水域的影响，加的斯湾和南阿尔伯兰海的组合具有主要的大西洋特征。相反，北阿尔伯兰海的水合物组合与利古里亚和南亚得里亚海的组合更相似，并且在这两个地中海区域中观察到的物种种类很多。从定量的观点来看，确定了14个物种对表征地中海水体物种库做出了最重要的贡献。这些分类单元包括以前被称为地中海水生动物群的典型组成部分的物种，以及最近才在该地区记录的物种（Eudendrium moulouyensis）和入侵者，例如Clytia hummelincki。

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