Mitochondrial DNA and morphological identification of a new species of Crassostrea (Bivalvia: Ostreidae) cultured for centuries in the Pearl River Delta, Hong Kong, China
Mitochondrial DNA and morphological identification of a new species of Crassostrea (Bivalvia: Ostreidae) cultured for centuries in the Pearl River Delta, Hong Kong, China
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DOI：
10.1016/s0044-8486(03)00215-1
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发表时间：
2003-12-01
期刊：
影响因子：
4.5
通讯作者：
Morton, B
中科院分区：
文献类型：
--
作者：
Lam, K;Morton, B
在中国珠江三角洲的一种牡蛎的种植被认为有近似700年的历史，目前香港的工业集中在后海湾的流浮山村。香港的牡蛎养殖品种的身份问题已讨论多年。本研究的目的是，因此，以确定其特定的身份比较线粒体DNA序列的遗传距离，即部分细胞色素氧化酶I和16S基因与其他Crassostrea物种。这是第一种牡蛎被描述的遗传，除了壳字符。基于细胞色素氧化酶I和16S数据集的系统发育分析表明，香港近江牡蛎（Crassostrea hongkongensis）在遗传上是一个独特的分类群，在遗传上是日本近江牡蛎（Crassostrea nippona）的姐妹分类群。香港近江牡蛎的显著特征包括：韧带区细长，呈弹性体状，收肌瘢痕呈D形，背缘直或略凸，棕黄色的薄片覆盖着未被侵蚀的右瓣。这项研究强调了利用分子遗传学的意义，伴随着形态学，在识别物种的臭名昭著的表型塑料牡蛎。(C)2003 Elsevier Science B.V.保留所有权利。
The cultivation of a species of Crassostrea in the Pearl River Delta, China, is reputed to have a similar to 700-year history, the industry in Hong Kong currently being centred around the village of Lau Fau Shan in Deep Bay. The identity of the cultured species of Crassostrea in Hong Kong has been discussed for many years. The objective of this study was, therefore, to determine its specific identity by comparing the genetic distances of mitochondrial DNA sequences, that is, partial cytochrome oxidase I and 16S genes with those of other Crassostrea species. This is the first species of Ostreidae to be described genetically, in addition to shell characters. Phylogenetic analyses based on the cytochrome oxidase I and 16S data set show that Crassostrea hongkongensis is a genetically distinct taxon. The new species is genetically a sister taxon to Crassostrea nippona.Distinctive features of C hongkongensis include an elongated, resilifer-like ligamental area, a D-shaped adductor muscle scar with a straight or slightly convex dorsal margin, three colour patterns and thin, brownish yellow lamellae covering the uneroded right valve. This study highlights the significance of using molecular genetics, accompanied by morphology, in identifying species of the notoriously phenotypically plastic Ostreidae. (C) 2003 Elsevier Science B.V. All rights reserved.