Mitochondrial DNA variation in spiny lobster Palinurus delagoae suggests genetically structured populations in the southwestern Indian Ocean
Mitochondrial DNA variation in spiny lobster Palinurus delagoae suggests genetically structured populations in the southwestern Indian Ocean
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DOI：
10.3354/meps319191
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发表时间：
2006-01-01
影响因子：
2.5
通讯作者：
Matthee, C. A.
中科院分区：
文献类型：
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作者：
Gopal, K.;Tolley, K. A.;Matthee, C. A.
多刺龙虾Palinurus delagoae栖息在印度洋西南部的深海沃茨和洋脊，在那里它支持商业渔业。为了调查人口结构和物理过程，可能会影响女性基因流在这个物种中，线粒体DNA（mtDNA）控制区（547个碱基对）的一部分进行了测序285龙虾从非洲东南海岸（6个网站）和49龙虾从沃尔特斯浅滩，一个淹没的海山马达加斯加脊。来自这两个地区的龙虾没有共享单倍型，并且至少有27个突变步骤不同。分子方差分析显示显着的遗传分区，和成对的比较表明，从沃尔特斯浅滩龙虾是不同的其他采样区。在南部的4个地点（南非）和北方的2个地点（莫桑比克）之间存在浅的遗传分区，表明非洲海岸沿着存在2个管理单位。一个不匹配的分布和傅氏F-检验表明相当近期的人口变化的人口内的人口，与发现在姐妹物种P. gilchristi。女性基因流沿着非洲海岸传播的幼虫分散在莫桑比克和厄古拉斯电流和逆流迁移的底栖少年沿着货架，但线粒体DNA数据强烈建议，在沃尔特斯浅滩的幼虫已经，或目前仍然保留其他海洋过程。非洲东南海岸和沃尔特斯浅滩的龙虾之间mtDNA差异的幅度，以及这些地区之间没有任何共享的单倍型强烈表明，这2个类群可能实际上代表不同的物种。
The spiny lobster Palinurus delagoae inhabits the deep shelf waters and oceanic ridges of the southwestern Indian Ocean, where it supports commercial fisheries. To investigate population structure and the physical processes that may have influenced female gene flow in this species, a portion of the mitochondrial DNA (mtDNA) control region (547 base pairs) was sequenced for 285 lobsters from the southeastern coast of Africa (6 sites) and 49 lobsters from Walters Shoals, a submerged seamount on the Madagascar Ridge. Lobsters from these 2 areas shared no haplotypes and differed by at least 27 mutational steps. An analysis of molecular variance showed significant genetic partitioning, and pairwise comparisons suggested that lobsters from Walters Shoals are distinct from those of other sampling areas. There was shallow genetic partitioning between 4 southern sites (South Africa) and 2 northern sites (Mozambique), suggesting 2 Management Units along the African coast. A mismatch distribution and Fu's F-test indicated fairly recent demographic changes within populations, consistent with that found in the sister species P. gilchristi. Female gene flow along the African coast may be propagated by larval dispersal in the Mozambique and Agulhas Currents and countercurrent migrations by benthic juveniles along the shelf, but the mtDNA data strongly suggest that larvae at Walters Shoals have been, or are currently still retained by other oceanographic processes. The magnitude of mtDNA divergence among lobsters from the southeastern coast of Africa and those at Walters Shoals, together with the absence of any shared haplotypes between these regions strongly suggest that these 2 taxa might in fact represent distinct species.