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

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, whil...

西北印度洋栖息着多种大型海洋脊椎动物类群，鉴于其分布、行为、形态等生物学特征存在显著的空间异质性，亟需对其遗传种群结构（genetic population structure）展开研究。本研究以4种具有不同生物学特征的商业化捕捞鲨鱼物种——乌翅真鲨（Carcharhinus limbatus）、短鳍斜齿鲨（Carcharhinus sorrah）、尖齿犁鳍鲨（Rhizoprionodon acutus）和路氏双髻鲨（Sphyrna lewini）为研究对象，探究红海与阿拉伯半岛周边所有海域之间的遗传种群结构。为评估种内基因连通模式（intraspecific patterns of connectivity），本研究基于线粒体控制区DNA（mitochondrial control region DNA）及共计20个微卫星位点（microsatellites），构建了单倍型（haplotype）间的统计简约网络（statistical parsimony networks），并估算了两项参数：(1) 种群结构；(2) 最近一次种群扩张时间（time of most recent population expansion）。分析结果表明，即便在体型更小、活动能力较弱的鲨鱼物种中，研究区域内也不存在阻碍当前基因交流的地理屏障，而……