Molecular evidence for multiple paternity in a feral population of green swordtails.
Molecular evidence for multiple paternity in a feral population of green swordtails.
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DOI：
10.1093/jhered/esn053
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发表时间：
2008-11
期刊：
影响因子：
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通讯作者：
L. Simmons;M. Beveridge;J. Evans
中科院分区：
文献类型：
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作者：
L. Simmons;M. Beveridge;J. Evans
遗传亲子关系分析提供了深入了解交配系统，并揭示了广泛的证据，一妻多夫在自然种群。在这里，我们使用5个微卫星标记估计女性交配率在野生种群的绿色剑尾鱼，剑尾鱼，活轴承poeciliid鱼，已成为一个模型系统的precopulatory择偶和交配竞争的研究。虽然早在1950年就被认为是研究精子竞争的潜在模型，但一直没有尝试探索其交配系统中的交配后性选择。因此，我们从野生种群中获得了关于一妻多夫的流行程度及其生物学相关性的信息。我们对14只野生捕获的妊娠雌性的后代进行了基因分型，并使用等位基因计数方法和GERUD和PARENTAGE程序确定了每窝中父亲的数量。我们的分析表明，57%（等位基因计数和GERUD）和71%（PARENTAGE）的抽样育雏至少有2个父亲，与全球平均1.74父亲每窝。父系偏斜一般是高的混合父系育雏，使我们的分析几乎肯定低估了实际的交配频率在野外。我们的数据提供了一个坚实的基础，为今后的研究交配后性选择在这个物种。
Genetic parentage analyses provide insights into mating systems and have revealed widespread evidence for polyandry in natural populations. Here, we use 5 microsatellite markers to estimate female mating rates in a feral population of green swordtails, Xiphophorus helleri, a live-bearing poeciliid fish that has become a model system in the study of precopulatory mate choice and mating competition. Although heralded as a potential model for investigating sperm competition as early as 1950, there has been no attempt to explore postcopulatory sexual selection in its mating system. We thus obtained information on the prevalence, and therefore biological relevance, of polyandry from a wild population. We genotyped the offspring from 14 wild-caught gravid females and determined the number of fathers in each brood using allele counting methods and the programs GERUD and PARENTAGE. Our analyses revealed that 57% (allele counts and GERUD) and 71% (PARENTAGE) of the sampled broods had at least 2 sires, with a global mean 1.74 fathers per brood. Paternity skew was generally high in mixed paternity broods so that our analyses almost certainly underestimate actual mating frequencies in the wild. Our data provide a solid underpinning for future studies of postcopulatory sexual selection in this species.