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首页> 外文期刊>The Royal Society Proceedings B: Biological Sciences >Snail sperm production characteristics vary with sperm competition risk
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Snail sperm production characteristics vary with sperm competition risk

机译：蜗牛精子的生产特性随精子竞争风险而变化

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Sperm competition is widespread and influences both male investment in spermatogenic tissue and ejaculate characteristics. Sperm competition models assume trade-offs between sperm size and number, although such trade-offs may be difficult to detect. This study examines the effects of sperm competition risk on the sperm production characteristics of the freshwater snail Viviparus ater. In this prosobranch, females mate frequently and store sperm, generating sperm competition. Males produce two sperm morphs, fertile eupyrene sperm and non-fertilizing oligopyrene sperm. Non-fertilizing sperm may play a role in sperm competition and therefore, like fertilizing sperm, the number produced could vary relative to sperm competition risk. In addition; trade-offs between sperm number and sperm size may be expected. We manipulated the sex ratio of sexually mature snails and found the presence of rivals affected the ratio of oligopyrene-eupyrene sperm males produced. In experimental and natural populations, the number of oligopyrene sperm produced, but not the number of eupyrene sperm, was significantly higher when the sex ratio was male biased. Testis mass did not vary between experimental treatments. We also found a negative relationship between the number and size of oligopyrene sperm produced, which is consistent with evolutionary models of sperm competition, and is, to our knowledge, the first intraspecific demonstration of a trade-off between these traits. [References: 53]
机译：精子竞争十分普遍，既影响男性对生精组织的投资，也影响射精特性。精子竞争模型假设在精子大小和数量之间进行权衡，尽管这种权衡可能很难检测到。本研究探讨了精子竞争风险对淡水蜗牛Viviparus ater精子生产特性的影响。在这个亲分支中，雌性频繁交配并储存精子，从而引发精子竞争。雄性产生两种精子形态，可育的紫杉精和不受精的低py精子。非受精精子可能在精子竞争中起作用，因此，与受精精子一样，产生的数量可能相对于精子竞争风险而有所不同。此外;可以在精子数量和精子大小之间进行权衡。我们操纵了性成熟蜗牛的性别比，发现竞争者的存在影响了所生产的低聚e-紫杉精男性的比例。在实验人群和自然人群中，当性别比例偏向男性时，产生的少py精子的数量显着增加，但紫杉烯精子的数量却没有显着增加。睾丸的质量在实验治疗之间没有变化。我们还发现所产生的寡re精子的数量和大小之间存在负相关关系，这与精子竞争的进化模型一致，并且据我们所知，这是这些特性之间进行权衡的第一个种内证明。 [参考：53]

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