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首页> 外文期刊>Marine biology >Multiple paternity and female sperm usage along egg-case strings of the knobbed whelk, Busycon carica (Mollusca; Melongenidae)
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Multiple paternity and female sperm usage along egg-case strings of the knobbed whelk, Busycon carica (Mollusca; Melongenidae)

机译：沿wh状卵的卵壳线使用多个父系和雌性精子，Busycon carica（软体动物； Melongenidae）

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摘要

We used genotypic data from three highly polymorphic microsatellite loci (two autosomal and one sex-linked) to examine micro-spatial and temporal arrangements of genetic paternity for more than 1,500 embryos housed along 12 egg-case strings of the knobbed whelk, Busycon carica. Multiple paternity proved to be the norm in these single-dam families, with genetic contributions of several sires (at least 3.5 on average) being represented among embryos within individual egg capsules as well as along the string. Two strings were studied in much greater detail; five and seven fathers were identified, none of which was among the several males found in consort with the female at her time of egg-laying. Each deduced sire had fathered roughly constant proportions of embryos along most of the string, but those proportions differed consistently among fathers. A few significant paternity shifts at specifiable positions along an egg-case string were also observed. Although the precise physical mechanisms inside a female whelk's reproductive tract remain unknown, our genetic findings indicate that successive fertilization events (and/or depositions of zygotes into egg capsules) normally occur as near-random draws from a well-but-not-perfectly blended pool of gametes (or zygotes) stemming from stored ejaculates, perhaps in different titers, of a dam's several mates.
机译：我们使用了来自三个高度多态的微卫星基因座（两个常染色体和一个性别相关）的基因型数据，研究了遗传亲子关系的微空间和时间排列，这些亲子关系是沿着12个蛋壳的带状螺线管Busycon carica上的1500多个胚胎进行的。在这些单坝家族中，多父系制被证明是常态，在单个卵囊内以及沿串的胚胎中表现出几个父系的遗传贡献（平均至少3.5个）。对两个弦进行了更详细的研究。确定了五个和七个父亲，但在产卵时与该女性交配的几只男性中，没有一位。每个推导的父亲在大部分琴弦上都有大致恒定比例的胚胎，但是父亲之间的比例始终不一致。在沿蛋箱串的特定位置也观察到一些明显的亲子转移。尽管雌性海蟹生殖道内的确切物理机制尚不清楚，但我们的遗传发现表明，正常的连续受精事件（和/或受精卵在卵囊中的沉积）通常发生在来自完全混合但未完全混合的近乎随机抽取的情况下大坝几个伴侣的射出的配子（或合子），可能来自不同滴度的射精。

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