Accounting for kin sampling reveals genetic connectivity in Tasmanian and New Zealand school sharks, Galeorhinus galeus

Fishing represents a major problem for conservation of chondrichthyans, with a quarter of all species being overexploited. School sharks, Galeorhinus galeus, are targeted by commercial fisheries in Australia and New Zealand. The Australian stock has been depleted to below 20% of its virgin biomass, and the species is recorded as Conservation Dependent within Australia. Individuals are known to move between both countries, but it is disputed whether the stocks are reproductively linked. Accurate and unbiased determination of stock and population connectivity is crucial to inform effective management. In this study, we assess the genetic composition and population connectivity between Australian and New Zealand school sharks using genome‐wide SNPs, while accounting for non‐random kin sampling. Between 2009 and 2013, 88 neonate and juvenile individuals from Tasmanian and New Zealand nurseries were collected and genotyped. Neutral loci were analyzed to detect fine‐scale signals of reproduct...捕捞活动是软骨鱼纲（chondrichthyans）物种保护面临的重大难题，全球已有四分之一的物种遭遇过度捕捞。翅鲨（Galeorhinus galeus）是澳大利亚与新西兰商业渔业的重点捕捞对象。澳大利亚海域的翅鲨渔业种群已衰减至初始生物量的20%以下，该物种在澳大利亚境内被列为依赖保护（Conservation Dependent）等级。已知该物种的个体会在两国间移动，但两地种群是否存在繁殖关联仍存在争议。精准且无偏地判定种群与种群连通性，可为制定有效的管理措施提供核心依据。本研究利用全基因组单核苷酸多态性（genome-wide SNPs）标记，评估澳大利亚与新西兰翅鲨的遗传组成及种群连通性，同时校正非随机亲缘抽样带来的系统偏差。2009年至2013年间，研究人员从塔斯马尼亚州及新西兰的翅鲨幼体庇护所采集了88尾新生个体与幼体，并进行基因分型。本研究通过分析中性位点，以检测繁殖相关的精细尺度信号……