Department of Fisheries Science, Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, VA 23062, USA.
J Hered. 2011 Jan-Feb;102(1):88-93. doi: 10.1093/jhered/esq084. Epub 2010 Jul 21.
Multiple paternity (MP) has been shown to be widespread in elasmobranch fishes although its prevalence and the number of sires per litter vary considerably among species. In the squaloid shark Squalus acanthias, MP has been reported, but whether it is a common feature of the species' reproductive strategy is unknown. In this study, we determined the frequency of MP in 29 litters of S. acanthias sampled from the lower Chesapeake Bay and coastal Virginia waters, using 7 highly polymorphic nuclear DNA microsatellite loci. Only 5 litters (17% of the total) were genetically polyandrous, with at least 2 sires per litter. Litter size increased with female size but was similar between polyandrous and monandrous females.
多父本（MP）已被证明在软骨鱼类中广泛存在，尽管其流行程度和每窝亲代数量在物种间差异很大。在角鲨科的尖吻鲭鲨（Squalus acanthias）中，已经报道了 MP，但它是否是该物种生殖策略的一个共同特征尚不清楚。在这项研究中，我们使用 7 个高度多态性的核 DNA 微卫星基因座，确定了来自切萨皮克湾下游和弗吉尼亚沿海水域的 29 窝尖吻鲭鲨的 MP 频率。只有 5 窝（总窝数的 17%）具有遗传上的多父本特性，每窝至少有 2 个亲代。窝仔数随母鱼体型增大而增加，但在多父本和单父本母鱼之间没有差异。
