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Molecular and morphological evidence for the identity of the blackspot shark, Carcharhinus sealei, and the Indonesian whaler shark, C. tjutjot, with notes on their population structures
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2020-09-10 , DOI: 10.1007/s10641-020-01025-z
Azie Azri , Hussein Taha , Takaomi Arai

The requiem sharks of the genus Carcharhinus are captured as bycatch in the Indo-Pacific region. The lack of morphometric data due to the common practice of head and fin removal of sharks, hinders the implementation of shark management measures. Carcharhinus specimens found in the waters of Brunei Darussalam were identified using morphological analysis, and their identification was further validated by mitochondrial cytochrome c oxidase subunit I (COI) gene sequence analysis. This study successfully identified twenty-seven specimens as either the blackspot shark, Carcharhinus sealei, or the Indonesian whaler shark, Carcharhinus tjutjot, by molecular genetic analysis, although the difficulty of accurately identifying these sharks solely on morphology was encountered. Mitochondrial COI gene sequence analysis also suggested that C. tjutjot has two genetically distinct populations/groups, while C. sealei had a single panmictic population in the Indio-Pacific region. The findings suggest that C. sealei could be a more highly migratory species than C. tjutjot in the region.

中文翻译:

黑斑鲨 Carcharhinus seaei 和印度尼西亚捕鲸鲨 C. tjutjot 身份的分子和形态学证据,以及它们的种群结构说明

Carcharhinus 属的安魂曲鲨鱼在印度洋-太平洋地区被作为兼捕物捕获。由于鲨鱼去除头鳍的普遍做法,缺乏形态测量数据,阻碍了鲨鱼管理措施的实施。在文莱达鲁萨兰国水域发现的真鲨属标本通过形态学分析进行鉴定,并通过线粒体细胞色素 c 氧化酶亚基 I (COI) 基因序列分析进一步验证其鉴定结果。这项研究通过分子遗传分析成功地将 27 个标本鉴定为黑斑鲨 Carcharhinus seaei 或印度尼西亚捕鲸鲨 Carcharhinus tjutjot,尽管遇到了仅根据形态准确识别这些鲨鱼的困难。线粒体 COI 基因序列分析也表明 C. tjutjot 有两个遗传上不同的种群/群体,而 C.seaei 在印度洋-太平洋地区有一个单一的 panmictic 种群。研究结果表明,在该地区,C. seaei 可能是比 C. tjutjot 更具迁移性的物种。
更新日期:2020-09-10
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