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首页> 外文期刊>Ethology >Size-Dependent Male Mate Preference and its Association with Size-Assortative Mating in a Mangrove Snail, Littoraria ardouiniana
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Size-Dependent Male Mate Preference and its Association with Size-Assortative Mating in a Mangrove Snail, Littoraria ardouiniana

机译：大小依赖的雄性交配偏好及其与美洲红树蜗牛（Littoraria ardouiniana）的大小选择交配的关联

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摘要

In many animals, body size plays a crucial role in mating success in the context of competition and preference for mates. Increasing evidence has shown that male mate preference can be size-dependent and, therefore, an important driver of size-assortative mating. To test this theory, mate choice experiments were performed during the three consecutive stages of mating behaviour, namely trail following, shell mounting and copulation, in the dioecious mangrove snail, Littoraria ardouiniana. These experiments identified two possible forms of size-dependent male mate preference which could contribute to the formation of size-assortative mating in these snails. Firstly, whereas small males were unselective, large males were selective and preferred to follow mucus trails laid by large females. Alternatively, the results can also be interpreted as all males were selective and adopted a mating strategy of selecting females similar to, or larger than, their own sizes. Both small and large males also copulated for longer with large than with small females, and this was more pronounced in large males. When two males encountered a female, they engaged in physical aggression, with the larger male excluding the smaller male from copulating with the female. This study, therefore, demonstrated that size-dependent male mate preference may, along with male-male competition, play an important role in driving size-assortative mating in these mangrove snails, and this may also be the case in other species that exhibit male mate choice.
机译：在许多动物中，在竞争和对配偶的偏好中，体型在交配成功中起着至关重要的作用。越来越多的证据表明，雄性配偶的偏好可能与体型有关，因此是体型交配的重要驱动力。为了检验这一理论，在雌雄异体的红树林蜗牛Littoraria ardouiniana的三个连续交配行为阶段中进行了择偶实验，即跟踪，壳安装和交配。这些实验确定了尺寸依赖的雄性配偶偏爱的两种可能形式，这可能有助于在这些蜗牛中形成尺寸不同的交配。首先，虽然小雄性是非选择性的，但大雄性是选择性的，并且倾向于遵循大雌性铺设的粘液迹。另外，结果也可以解释为所有雄性都是选择性的，并且采用了选择雌性与其自身大小相似或更大的雌性的交配策略。大型和大型雄性的交配时间也比小型雌性更长，在大型雄性中更明显。当两个雄性遇到一个雌性时，他们会进行身体攻击，较大的雄性会排除较小的雄性与雌性交配。因此，这项研究表明，大小依赖的雄性配偶的偏好可能与雄性-雄性竞争一起，在驱动这些红树林蜗牛的大小相关性交配中发挥重要作用，在其他表现出雄性的物种中也可能如此。选择伴侣。

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