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首页> 外文期刊>Marine ecology progress series >Mitochondrial DNA panmixia in spiny lobster Palinurus gilchristi suggests a population expansion
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Mitochondrial DNA panmixia in spiny lobster Palinurus gilchristi suggests a population expansion

机译：刺龙虾Palinurus gilchristi的线粒体DNA泛混合症表明种群正在扩大

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摘要

The spiny lobster Palinurus gilchristi is endemic to the deep shelf waters along the southern coast of South Africa, where it supports a commercial fishery. Mark-recapture studies and phenotypic differences suggest there are 2 populations of this species along the coast, but it is unknown if the observed differences have arisen because of low gene flow and subsequent genetic differentiation. To investigate population structure and the physical processes that may have influenced gene flow, a portion of the mitochondrial DNA control region was sequenced for 187 lobsters across the entire range of the species. An analysis of molecular variance showed no significant genetic difference between the 2 putative populations. A mismatch distribution and Fu's F_S test indicated that this species has undergone a fairly recent demographic expansion (population size and geographic range). The genetic structure of this species could be panmictic due to a high amount of gene flow between the 2 regions during the larval stage, when the larvae are carried downstream by the Agulhas Current. Furthermore, the lack of genetic differences between the 2 putative populations could be the result of a recent demographic expansion accompanied by low diversity of haplotypes produced by a leading edge effect from the expansion.
机译：多刺的龙虾Palinurus gilchristi在南非南部海岸的深架子水域中很常见，在那里它支持商业化渔业。标记捕获研究和表型差异表明该物种在沿海有2个种群，但尚不清楚观察到的差异是否是由于基因流量低和随后的遗传分化引起的。为了研究可能影响基因流的种群结构和物理过程，对线粒体DNA控制区的一部分进行了测序，确定了整个物种范围内的187个龙虾。分子变异分析表明，两个推定的种群之间没有显着的遗传差异。不匹配分布和Fu的F_S测试表明该物种最近经历了人口膨胀（种群大小和地理范围）。当幼虫被Agulhas潮流带到下游时，由于在幼虫期两个区域之间大量的基因流动，该物种的遗传结构可能是恐慌的。此外，这两个推定种群之间缺乏遗传差异可能是由于最近的人口扩张，以及由于扩张的前沿效应所产生的单倍型多样性低所致。

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