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首页> 外文期刊>Marine ecology progress series >Environmental sex determination in a parasitic copepod: checking heterogeneity and unpredictability of the environment
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Environmental sex determination in a parasitic copepod: checking heterogeneity and unpredictability of the environment

机译：寄生co足类动物的环境性别决定：检查环境的异质性和不可预测性

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摘要

For some organisms, sex is not fixed by genotype at conception but determined later by environmental conditions encountered during development (environmental sex determination, ESD). According to theoretical models, selection should favour ESD when the environment experienced by offspring is patchy and unpredictable and affects the relative fitness of males and females differentially. In a field study, we analysed the environmental heterogeneity displayed among individuals of the sea squirt dona intestinalis, a host for the copepod Pachypygus gibber, which is characterised by ESD. Consistent with theoretical predictions, environmental parameters that affect sex-specifically the fitness of the parasite (food and sexual partners) vary significantly in space and time. The spatial genetic structure of populations of P. gibber in the Thau lagoon, France, was investigated from allozyme data. No differentiation was found between distant populations, indicating that the larvae disperse intensively in the lagoon. Since their environment has been shown to be heterogeneous in space, and since the mothers cannot leave the host in which they developed, we conclude that both parent and offspring have little control over the quality of the environment the offspring enters. All the conditions are thus validated to support the adaptive nature of ESD in P. gibber.
机译：对于某些生物，性别并不是受孕时的基因型决定的，而是由发育过程中遇到的环境条件（环境性别确定，ESD）决定的。根据理论模型，当后代所经历的环境多变且不可预测并且对雌性和雌性的相对适应性产生不同的影响时，选择应该倾向于ESD。在一项野外研究中，我们分析了海鞘don肠道个体（displayed足Pachypygus赤足的寄主）的环境异质性，该种群以ESD为特征。与理论预测一致，影响性别的环境参数对寄生虫（食物和性伴侣）的适应性有特定的影响，其时空变化很大。从同工酶数据调查了法国Thau泻湖中的赤嘴猴种群的空间遗传结构。在远处的种群之间未发现差异，表明幼虫在泻湖中集中分布。由于已经证明他们的环境在空间上是异质的，并且由于母亲无法离开其成长所在的宿主，因此我们得出结论，父母和后代对后代进入的环境质量几乎没有控制权。因此，所有条件都得到了验证，可以支持赤霉菌的ESD适应性。

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