Mitochondrial DNA variation of the west-coast rock lobster, Jasus lalandii:: marked genetic diversity differences among sampling sites
Mitochondrial DNA variation of the west-coast rock lobster, Jasus lalandii:: marked genetic diversity differences among sampling sites
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DOI：
10.1071/mf07138
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发表时间：
2007-01-01
影响因子：
1.8
通讯作者：
von der Heyden, Sophie
中科院分区：
文献类型：
--
作者：
Matthee, Conrad A.;Cockcroft, Andrew C.;von der Heyden, Sophie
Jasus lalandii (Milne-Edwards 1837) 是一种西海岸岩龙虾，生活在南部非洲南部和西部海岸的浅水、冷温带水域。该物种有着悠久的集约开发历史，过去对种群数量产生了重大影响。为了加深我们目前对龙虾种群结构的了解，我们为在 8 个采样点收集的 235 名成年个体生成了线粒体 (mt) DNA 16S rRNA 基因的遗传数据。大多数个体 (59.6%) 拥有共同的单倍型，并且 35 种独特的单倍型分散在整个范围内。总体而言，97.2% 的变异存在于采样点内的个体之间，2.8% 的变异存在于采样点之间。成对 Phi(ST) 分析揭示了豪特湾个体与其他一些采样点之间浅层但重要的结构。 J. lalandii 单倍型网络表明没有地理信号的星状结构；然而，遗传多样性在物种分布的边缘急剧下降。 J. lalandii 种群普遍缺乏系统发育地理学结构，可能是由于缺乏幼虫扩散的强大障碍。根据我们的 mtDNA 数据，没有理由承认不同的渔业种群，但豪特湾和汉克里普角（后者目前位于海洋保护区之外）种群的高度遗传多样性使得这些种群对保护工作至关重要。
Jasus lalandii (Milne-Edwards 1837), thewest-coast rock lobster, occurs in the shallow, cool-temperate waters along the south and west coasts of southern Africa. This species has a long history of intensive exploitation, which has had a significant impact on population numbers in the past. To enhance our current understanding of lobster population structuring, genetic data from the mitochondrial (mt) DNA 16S rRNA gene was generated for 235 adult individuals collected at eight sampling sites. Most individuals (59.6%) share a common haplotype and 35 unique haplotypes were dispersed throughout the range. In total, 97.2% of the variation was found among individuals within sampling sites and 2.8% was among sites. Pairwise Phi(ST) analyses revealed shallow, yet significant structure between Hout Bay individuals and some other sampling sites. The J. lalandii haplotype network indicates a starlike structure with no geographic signal; however, genetic diversity sharply decreases towards the edges of the species distribution. The general lack of phylogeographic structure among J. lalandii populations probably results from the absence of strong barriers to larval dispersal. Based on our mtDNA data there is no justification for the recognition of separate fishing stocks, but the high genetic diversities of populations at Hout Bay and Cape Hangklip, the latter currently outside of marine protected areas, makes these populations critical to conservation efforts.