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首页> 外文期刊>Journal of Molluscan Studies >Extensive cryptic diversity of giant clams (Cardiidae: Tridacninae) revealed by DNA-sequence-based species delimitation approaches with new data from Hainan Island, South China Sea
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Extensive cryptic diversity of giant clams (Cardiidae: Tridacninae) revealed by DNA-sequence-based species delimitation approaches with new data from Hainan Island, South China Sea

机译：基于DNA序列的物种划分方法揭示了大蛤蜊（Cardiidae：Tridacninae）的巨大蛤蜊划分方法，南海海南岛的新数据揭示

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摘要

Accurate species delimitation is important, especially for endangered species. As one of the most conspicuous bivalve taxa, giant clams are threatened throughout their geographic range. Many phylogeographic studies have revealed strong population structure among giant clams in the Indo-Pacific, suggesting cryptic diversity within these species. However, less attention has been paid to their identification and delimitation. In this study, we assembled a comprehensive dataset of mitochondrial cytochrome c oxidase subunit I (COI) sequences for Tridacna species, focusing on new sequences from Hainan Island in the South China Sea and previously published ones from Japan, Taiwan, Singapore, the Philippines, Indonesia, Australia, the Solomon Islands and the Red Sea. Three nominal species, Tridacna crocea, T squamosa and T noae, were recognized at Hainan Island on the basis of distance-based DNA barcoding, with mean interspecific K2P distances of 10.6-24.7% for seven Tridacna species (T crocea, T squamosa, T. noae, T maxima, T mbalavuana, T derasa and T gigas). The most abundant species, T. noae, represents the first record of this species from Hainan Island. Using a combination of phylogenetic and DNA-based species delimitation analyses (automatic barcode gap discovery, generalized mixed Yule coalescent and Bayesian Poisson tree processes), we found strong support for a total of 13 operational taxonomic units (OTUs) for the seven nominal Tridacna species. These results, coupled with the fact that each OTU occupies different regions in the Indo-Pacific, strongly suggest multiple cryptic species of giant clams. Our findings point to the need for taxonomic revisionary work on giant clams throughout the Indo-Pacific; such work will have important conservation implications.
机译：准确的物种划界很重要，特别是对于濒危物种。作为最具显着的双抗性分类群之一，巨大的蛤蜊在整个地理范围内受到威胁。许多邮局研究揭示了印度太平洋巨型蛤蜊的强大人口结构，暗示了这些物种内的隐秘多样性。但是，对其识别和划界的关注较少。在这项研究中，我们组装了Tridacna物种的线粒体细胞色素C氧化酶亚基I（COI）序列的综合性数据集，其侧重于南海海南岛的新序列，并从日本，台湾，新加坡，菲律宾出版的新序列，印度尼西亚，澳大利亚，所罗门群岛和红海。三个标称物种，Tridacna番蟹猴，T Squamosa和T Noae在海南岛被认可，基于距离的DNA条形码在海南岛被认可，其七种Tridacna物种的平均缺点K2P距离为10.6-24.7％（T Crocea，T Squamosa，T 。Noae，T Maxima，T Mbalavuana，T DARASA和T GIGAS）。最丰富的物种T. noae代表了海南岛的本物种的第一条记录。利用系统发育和基于DNA的种类分析（自动条码间隙发现，广义混合Yule泛光和Bayesian Poisson树工艺），我们发现对七种标称三曲线物种的总共13个操作分类单位（OTUS）的强劲支持。这些结果与每个OTU在印度太平洋地区占据不同地区的事实相结合，强烈建议多种神秘的巨型蛤蜊。我们的调查结果指出了在整个印度 - 太平洋地区巨型蛤蜊的分类经常工作;这些工作将具有重要的保护意义。

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