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Population genetics of four heavily exploited shark species around the Arabian Peninsula

机译:阿拉伯半岛周围四种严重利用鲨鱼的种群遗传学

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摘要

The northwestern Indian Ocean harbors a number of larger marine vertebrate taxa that warrant the investigation of genetic population structure given remarkable spatial heterogeneity in biological characteristics such as distribution, behavior, and morphology. Here, we investigate the genetic population structure of four commercially exploited shark species with different biological characteristics (Carcharhinus limbatus, Carcharhinus sorrah, Rhizoprionodon acutus, and Sphyrna lewini) between the Red Sea and all other water bodies surrounding the Arabian Peninsula. To assess intraspecific patterns of connectivity, we constructed statistical parsimony networks among haplotypes and estimated (1) population structure; and (2) time of most recent population expansion, based on mitochondrial control region DNA and a total of 20 microsatellites. Our analysis indicates that, even in smaller, less vagile shark species, there are no contemporary barriers to gene flow across the study region, while historical events, for example, Pleistocene glacial cycles, may have affected connectivity in C. sorrah and R. acutus. A parsimony network analysis provided evidence that Arabian S. lewini may represent a population segment that is distinct from other known stocks in the Indian Ocean, raising a new layer of conservation concern. Our results call for urgent regional cooperation to ensure the sustainable exploitation of sharks in the Arabian region.
机译:印度洋西北部拥有许多较大的海洋脊椎动物类群,鉴于生物学特征(例如分布,行为和形态)具有显着的空间异质性,因此有必要对遗传种群结构进行研究。在这里,我们调查了红海和阿拉伯半岛周围所有其他水域之间具有不同生物学特征的四种商业开发鲨鱼物种的遗传种群结构(Car鲨,limb鲨,or鱼和Rh鲨)。为了评估种内连通性模式,我们在单倍型之间构建了统计简约网络,并估计了(1)种群结构; (2)基于线粒体控制区DNA和总共20个微卫星的最近种群扩展时间。我们的分析表明,即使在较小,不那么易变的鲨鱼物种中,整个研究区域的基因流动也没有当代障碍,而历史事件(例如更新世冰川周期)可能已经影响了C.sorrah和R.acutus 。简约网络分析提供了证据,证明阿拉伯S.lewini可能代表了与印度洋其他已知种群不同的人口部分,从而引起了新的保护问题。我们的结果要求进行紧急的区域合作,以确保阿拉伯地区鲨鱼的可持续利用。

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