Social group composition modulates the role of last male sperm precedence in post-copulatory sexual selection
Social group composition modulates the role of last male sperm precedence in post-copulatory sexual selection
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DOI：
10.1111/jeb.14191
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发表时间：
2023-06-21
影响因子：
2.1
通讯作者：
Wigby，Stuart
中科院分区：
文献类型：
--
作者：
Morimoto，Juliano;McDonald，Grant C.;Wigby，Stuart
在许多物种中，雄性与雌性交配的顺序解释了交配后性选择所产生的父权差异。对果蝇的研究表明，交配顺序可能是雄性生殖成功差异的大部分原因。然而，交配顺序对父权偏见的影响可能不是静态的，而是可能随着社会或环境因素而变化。为了测试这个想法，我们使用了一个现有的数据集，从我们以前发表的实验中整理出来（Morimoto et al.，PLoS One，11，2016，e0154468），并添加了来自同一实验的未发表数据。这些先前的实验操纵果蝇的幼虫密度，产生雄性和雌性体型的变化，组装不同大小的个体组，并测量交配成功率和焦点雄性的父系份额。此处提供的数据提供了关于每个焦点雄性的交配顺序和焦点雄性与相同雌性再次交配（“重复交配”）的频率的信息。我们将这些信息与我们以前报道的焦点男性生殖成功分区方差父系男性交配顺序和重复交配不同的男性和女性的身体大小组成的群体。我们发现，正如预期的那样，男性交配顺序解释了相当大一部分的男性亲子关系的差异。但是，我们也发现，雄性交配顺序对雄性父权的影响受到群体的体型组成的影响。具体而言，男性往往交配最后有一个更大的父系优势，并显示较低的方差，在组中含有一个异质的混合物男性的身体大小比在组中有一个单一的男性的身体大小。在所有实验中，重复交配对雄性亲子关系份额的方差只有很小的贡献。总体而言，我们的研究结果有助于越来越多的研究表明，交配后的性选择是受socio-ecological influencs.AbstractSocial组组成影响的作用，最后一个男性精子优先果蝇。
In many species, the order in which males mate with a female explains much of the variation in paternity arising from post‐copulatory sexual selection. Research in Drosophila suggests that mating order may account for the majority of the variance in male reproductive success. However, the effects of mating order on paternity bias might not be static but could potentially vary with social or environmental factors. To test this idea, we used an existing dataset, collated from an experiment we previously published (Morimoto et al., PLoS One, 11, 2016, e0154468), with the addition of unpublished data from the same experiment. These previous experiments manipulated larval density in Drosophila melanogaster which generated variation in male and female body size, assembled groups of individuals of different sizes, and measured the mating success and paternity share of focal males. The data presented here provides information on each focal male's mating order and the frequency in which focal males remated with same females (‘repetitive matings’). We combined this information with our previously reported focal male reproductive success to partition variance in paternity into male mating order and repetitive matings across groups that differed in the body size composition of males and females. We found, as expected, that male mating order explained a considerable portion of the variance in male paternity. However, we also found that the impact of male mating order on male paternity was influenced by the body size composition of groups. Specifically, males that tended to mate last had a greater paternity advantage, and displayed lower variance, in groups containing a heterogenous mixture male body sizes than in groups with a single male body size. Repetitive mating only had a minor contribution to the variance in male paternity share across all experiments. Overall, our findings contribute to the growing body of research showing that post‐copulatory sexual selection is subject to socio‐ecological influences.AbstractSocial group composition affects the role of last male sperm precedence in Drosophila.