Valenzuela N
Department of Ecology and Evolution, SUNY at Stony Brook, Stony Brook, NY 11794-5245, USA.
Mol Ecol. 2000 Jan;9(1):99-105. doi: 10.1046/j.1365-294x.2000.00806.x.
Multiple paternity was found in two clutches of Podocnemis expansa using eight microsatellite loci. When loci were analysed separately a minimum of two males was estimated for nest N23, and three for nest C17. When all loci were combined, three patrilines were detected in N23, and six in C17. The distribution of full-sib cluster sizes indicated a disproportionate contribution of one male to clutch C17, consistent with possible sperm competition, or the mixing of leftover and newly acquired sperm. High mutation rates were detected at several loci. Multiple paternity has positive implications for this endangered species as it may slow the loss of genetic variability caused by drift. This is the first report of multiple paternity in the suborder Pleurodira.
利用八个微卫星位点，在两窝南美巨型侧颈龟（Podocnemis expansa）中发现了多重父权现象。当单独分析各个位点时，估计N23巢至少有两只雄性参与受精，C17巢有三只。当所有位点合并分析时，在N23巢检测到三条父系，在C17巢检测到六条。全同胞聚类大小的分布表明，有一只雄性对C17巢的贡献不成比例，这与可能的精子竞争，或残留精子与新获取精子的混合情况相符。在几个位点检测到高突变率。多重父权现象对这种濒危物种具有积极意义，因为它可能减缓由遗传漂变导致的遗传变异性丧失。这是侧颈龟亚目多重父权现象的首次报道。
