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No support for intra-nor inter-locus sexual conflict over mating latency and copulation duration in a polyandrous fruit fly
bioRxiv - Evolutionary Biology Pub Date : 2020-10-18 , DOI: 10.1101/2020.10.18.344390
Julie M. Collet , Jacqueline L Sztepanacz

The total strength of sexual selection on males depends on the relationship between various components of pre- and post-copulatory fitness. Misalignment between male and female interests creates inter-locus sexual conflict, where the fitness of one sex is increased at the expense of the other. Although rarely considered, mating behaviours can also be genetically correlated between males and females, creating intra-locus sexual conflict, where beneficial alleles in one sex are costly when expressed in the other sex. How inter- and intra-locus sexual conflicts operate on the expression of mating behaviours remains little understood. Here, we study male attractiveness, mating latency and copulation duration in two populations of the polyandrous Drosophila serrata. Univariate analyses show little genetic variance in mating latency, and that males, but not females, contribute to copulation duration genetic variance. Further, multivariate analyses revealed little covariance between the studied traits. However, analyses considering male and female contribution in a single framework supported genetic contributions from both sexes for mating behaviours and complex patterns of between sexes correlations. Finally, our study did not find any association between those mating behaviours and fitness component, specifically (i) no phenotypic covariance between male attractiveness and mating latency and, (ii) longer copulations did not result in the production of more offspring. With no detectable fitness benefits in any sexes for shorter mating latency or longer copulation duration, our results do not support the presence of inter- nor intra-locus sexual conflict for these mating traits.

中文翻译:

不支持一生多果蝇的交配潜伏期和交配持续时间内或就座间性冲突

男性进行性选择的总强度取决于交配前后适应度的各个组成部分之间的关​​系。男性和女性利益之间的错位会造成场所间性冲突,其中一种性别的适应度会增加,而另一种性别的代价会增加。尽管很少考虑,但交配行为也可以在男性和女性之间遗传相关,从而造成场所内性冲突,其中一种性别中的有益等位基因在另一种性别中表达时代价很高。场所间和场所内的性冲突如何影响交配行为的表达仍知之甚少。在这里,我们研究了雄性果蝇的两个种群中雄性的吸引力,交配潜伏期和交配持续时间。单变量分析显示,交配潜伏期的遗传差异很小,而雄性,但不是雌性,有助于交配持续时间的遗传变异。此外,多变量分析显示所研究特征之间的协方差很小。但是,在一个单一框架中考虑男性和女性贡献的分析支持了两性在交配行为和两性之间相关关系的复杂模式方面的遗传贡献。最后,我们的研究未发现这些交配行为与适应性成分之间有任何关联,特别是(i)雄性吸引力与交配潜伏期之间没有表型协方差,并且(ii)交配时间较长不会导致产生更多后代。对于较短的交配潜伏期或更长的交配持续时间,任何性别都没有可检测到的健身益处,我们的结果不支持这些交配特征存在场所间或场所内性冲突。有助于交配持续时间的遗传变异。此外,多变量分析显示所研究特征之间的协方差很小。但是,在一个单一框架中考虑男性和女性贡献的分析支持了两性在交配行为和两性之间相关关系的复杂模式方面的遗传贡献。最后,我们的研究未发现这些交配行为与适应性成分之间有任何关联,特别是(i)雄性吸引力与交配潜伏期之间没有表型协方差,并且(ii)交配时间较长不会导致产生更多后代。对于较短的交配潜伏期或更长的交配持续时间,任何性别都没有可检测到的健身益处,我们的结果不支持这些交配特征存在场所间或场所内性冲突。有助于交配持续时间的遗传变异。此外,多变量分析显示所研究特征之间的协方差很小。但是,在一个单一框架中考虑男性和女性贡献的分析支持了两性在交配行为和两性之间相关关系的复杂模式方面的遗传贡献。最后,我们的研究未发现这些交配行为与适应性成分之间有任何关联,特别是(i)雄性吸引力与交配潜伏期之间没有表型协方差,并且(ii)交配时间较长不会导致产生更多后代。对于较短的交配潜伏期或更长的交配持续时间,任何性别都没有可检测到的健身益处,我们的结果不支持这些交配特征存在场所间或场所内性冲突。
更新日期:2020-10-19
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