Abstract

Genetic markers (sex-specific loci of Ga1 and Ga2) have been used to analyze the sex ratio of the threespine stickleback at different stages of ontogenesis. The progeny of all individually tested females includes both males and females, and no significant departures from a 1 : 1 sex ratio has been found in embryos from the natural nests. Juveniles did not demonstrate a sex bias up to one-and-a-half or two months of age, but in older juveniles, females prevailed (this fact has been reported for the first time). Females prevail among spawners, which mostly results from the predominant elimination of males during the spawning and post-spawning periods. The possible causes of this predominance are discussed.

中文翻译：

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通过环境因素而非遗传因素确定三刺棘鱼 Gasterosteus aculeatus 的一些幼年和产卵者样本中的雌性偏见性别比

摘要

遗传标记（Ga1 和 Ga2 的性别特异性位点）已被用于分析三刺棘鱼在不同个体发育阶段的性别比例。所有单独测试的雌性的后代都包括雄性和雌性，并且在来自天然巢穴的胚胎中没有发现明显偏离 1:1 的性别比例。一岁半或两个月大的幼鱼并没有表现出性别偏见，但在较大的幼鱼中，雌性占了上风（这一事实已被首次报道）。雌性在产卵者中占主导地位，这主要是由于在产卵和产卵后时期雄性的主要消除。讨论了这种优势的可能原因。