Conservation genetics of the scalloped hammerhead shark in the Pacific coast of Colombia

Previous investigations of the population genetics of the scalloped hammerhead sharks (Sphyrna lewini) in the Eastern Tropical Pacific have lacked information about nursery areas. Such areas are key to promoting conservation initiatives that can protect young sharks from threats such as overfishing. Here, we investigated the genetic diversity, phylogeography, and connectivity of S. lewini found in 3 areas of Colombia’s Pacific coast: around Malpelo Island and in 2 National Natural Parks on the Colombian Pacific mainland (Sanquianga and Ensenada de Utría). We analyzed mtDNA control region (CR) sequences and genotyped 15 microsatellite loci in 137 samples of adults and juveniles. The mtDNA analyses showed haplotypes shared between the Colombian Pacific individuals sampled in this investigation and other areas in the Eastern Tropical Pacific, the Indo-Pacific, and with sequences previously reported in Colombia (Buenaventura Port), as well as 4 unique haplotypes. Population assignment and p...既往针对东热带太平洋海域的路氏双髻鲨（Sphyrna lewini）的种群遗传学研究，均缺乏关于其育幼场的相关信息。此类育幼场是推动保护举措的核心所在，可有效保护幼鲨免受过度捕捞等威胁。本研究针对哥伦比亚太平洋沿岸3个区域的路氏双髻鲨展开了遗传多样性、系统地理学以及种群连通性分析：分别为马尔佩洛岛周边海域，以及哥伦比亚太平洋本土的2处国家自然公园（桑基安加国家自然公园与恩塞纳达德乌特里亚国家自然公园）。我们对137份成体与幼体样本的线粒体DNA（mtDNA）控制区（CR）序列进行了分析，并对15个微卫星位点进行了基因分型。线粒体DNA分析结果显示，本研究采样的哥伦比亚太平洋海域个体，与东热带太平洋其他区域、印度-太平洋海域的个体共享单倍型，同时也与此前在哥伦比亚（布埃纳文图拉港）报道的序列共享单倍型，此外还存在4个特有单倍型。种群归属分析与...