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首页> 外文期刊>Marine biology >Between the current and the coast: genetic connectivity in the spiny lobster Panulirus homarus rubellus, despite potential barriers to gene flow
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Between the current and the coast: genetic connectivity in the spiny lobster Panulirus homarus rubellus, despite potential barriers to gene flow

机译：在当前和沿海之间：尽管对基因流动有潜在障碍，但刺龙虾Panulirus homarus rubellus的遗传连通性

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摘要

The spiny lobster Panulirus homarus rubellus is endemic to the Southwest Indian Ocean, where it inhabits a narrow continental shelf between an exposed coast and the upper reaches of the strong western-boundary Agulhas Current. Long-lived phyllosoma larvae released in this dynamic ocean environment have an uncertain fate-they can be retained over the shelf by sub-mesoscale processes, dispersed downstream along the coast or across the Mozambique Channel, or become entrained in the Agulhas Current, and presumably lost. To assess gene flow and population genetic structure, we analyzed mitochondrial cytochrome oxidase subunit 1 and hypervariable control region sequences, and 19 nuclear microsatellite loci obtained from lobsters collected at nine sites in eastern South Africa, Mozambique and southeast Madagascar. Clustering analyses confirmed genetic connectivity among all populations, and gene flow patterns supported the hypothesis that nearshore processes, such as lee eddies and counter currents, retain some phyllosomas over the shelf; whereas, net gene flow direction was moderate towards the southwest. The Mozambique Channel did not impede contemporary gene flow from Madagascar to the African shelf, but return gene flow was rare. Different marker types showed contrasting gene flow patterns during contemporary and evolutionary periods, when Pleistocene glacial/interglacial cycles would have affected sea level, ocean currents and dispersal patterns. Despite genetic connectivity and the importance of local recruitment, recent gene flow suggests an ancillary source/sink dynamic concordant with the prevailing southwesterly direction of boundary currents at the shelf-edge-a factor to consider in regional fisheries and conservation strategies.
机译：多刺的龙虾Panulirus homarus rubellus特有于西南印度洋，它居住在一个裸露的大陆架上，位于一个裸露的海岸和强大的西边界Agulhas Current上游之间。在这种多变的海洋环境中释放的长寿叶状体幼虫的命运不确定，可以通过亚中尺度过程保留在架子上，分散在沿海下游或莫桑比克海峡的下游，或者夹带在阿古拉斯海流中，大概是丢失。为了评估基因流和种群遗传结构，我们分析了线粒体细胞色素氧化酶亚基1和高变控制区序列，以及从南非东部，莫桑比克和马达加斯加东南部9个地点收集的龙虾获得的19个核微卫星基因座。聚类分析证实了所有种群之间的遗传连通性，并且基因流动模式支持这样的假说，即近海过程，如回旋涡和逆流，在架子上保留了一些叶瘤。净基因流向西南方向适中。莫桑比克海峡并未阻碍当代基因从马达加斯加流向非洲大陆架，但返回基因流却很少。在现代和进化时期，不同的标记物类型显示出相反的基因流动模式，当时更新世的冰川/冰间周期将影响海平面，洋流和扩散模式。尽管遗传上的连通性和在当地招募的重要性，但最近的基因流动表明，在陆架边缘的边界水流主要向西南方向流动，是辅助的源/汇动态，这是区域渔业和保护战略中需要考虑的因素。

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  • 来源
    《Marine biology》 |2019年第3期|36.1-36.16|共16页
  • 作者

    Singh Sohana P.; Groeneveld Johan C.; Willows-Munro Sandi;

  • 作者单位

    Oceanog Res Inst, POB 10712, ZA-4056 Marine Parade, South Africa|Univ KwaZulu Natal, Sch Life Sci, Pietermaritzburg, South Africa;

    Oceanog Res Inst, POB 10712, ZA-4056 Marine Parade, South Africa|Univ KwaZulu Natal, Sch Life Sci, Pietermaritzburg, South Africa;

    Univ KwaZulu Natal, Sch Life Sci, Pietermaritzburg, South Africa;

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