Male genital traits and mating interval affect male fertilization success in the water strider Gerris lacustris
Male genital traits and mating interval affect male fertilization success in the water strider Gerris lacustris
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DOI：
10.1007/s002650050604
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发表时间：
1999-08-01
影响因子：
2.3
通讯作者：
Askenmo, C
中科院分区：
文献类型：
--
作者：
Danielsson, I;Askenmo, C
帕克的开创性工作使人们注意到通过非随机受精成功进行交配后性选择的可能性。这些过程的机制仍然只是部分理解，显然需要更多的研究精子优先的种内变异。在这里，我们报告的结果，从实验研究的变化在受精成功之间的男性的水的水？获得里斯湖。生殖器形态，男性的身体大小，和交配持续时间进行了检查，可能与父子关系。并对保护时间的意义进行了分析。只有男性生殖器形态与受精成功相关。这是第一个显示雄性生殖器性状和受精成功之间关系的研究之一，支持性选择可能是内部受精动物生殖器结构快速和多样化进化的原因。最后一个男性的受精成功变化很大，双交配后，交配间隔很短（10分钟）。最后一个男性的优先权范围从0到100%，通常是一个男性参与受精几乎所有的鸡蛋。在短交配间隔的双交配后，最后一个雄性受精卵的比例平均为0.68，大于0.5。与此相反，平均受精成功偏向于第一个男性时，交配更分散随着时间的推移（24小时）。这些结果并不支持早期的建议，广泛的最后一个男性精子优先在水里。
Parker's seminal work brought attention to the possibility of postmating sexual selection by nonrandom fertilization success. Mechanisms for these processes are still only partly understood and there is clearly a need for more studies of intraspecific variation in sperm precedence. Here, we report results from an experimental study of the variation in fertilization success between males of the water strider Get ris lacustris. Genital morphology, male body size, and copulation duration were examined as possible correlates of paternity. The significance of guarding duration was also analysed. Only male genital morphology was correlated to fertilization success. This is one of the first studies showing a relationship between male genital traits and fertilization success, supporting the view that sexual selection may be responsible for the rapid and divergent evolution of genital structures in animals with internal fertilization. The fertilization success of last males varied considerably after double matings with a short mating interval (10 min). Last-male priority ranged from 0 to 100% and usually one of the males involved fertilized almost all the eggs. After double matings with a short mating interval, the proportion of eggs fertilized by the last male averaged 0.68 and was greater than 0.5. In contrast, the average fertilization success was biased towards the first male when the matings were more spread out over time (24 h). These results do not support earlier suggestions of a widespread last-male sperm priority in water striders.