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Body Size Not Personality Explains Both Male Mating Success and Sexual Cannibalism in a Widow Spider

机译:身体规模而不是个性解释了寡妇蜘蛛的男性交配成功和性食人鱼

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摘要

The role of personality in sexual selection has mostly been investigated on vertebrate species, in which males provide direct benefits to females or offspring. Less is known about the links between behavioral variation and sexual selection in species where males provide only sperm, while the advantages of female-choice are due to male genes that increase offspring fitness. Our study is centered on a sexually-size dimorphic spider species, the Mediterranean black widow, which is ideal to investigate how sexual selection shapes behavior. In this species, a male-biased operational sex-ratio leads to male-male competition, and aggressive and/or large males should have a selective advantage. Females are selected for fecundity, which should correlate with selection for higher voraciousness. Theory predicts that voracity “spills-over” into the mating context, such that voracity towards prey correlates with voracity towards mates. We tested how body size and two behaviors, male aggression toward rivals and female voracity toward prey, influence mating behavior, mating success, and sexual cannibalism. We show that individual variation in aggression does not play a direct role in the mating behavior of this species. Instead, body size affects male mating success and the occurrence of sexual cannibalism in females.
机译:人格在性选择中的作用主要是在脊椎动物种类上进行了调查,其中雄性为女性或后代提供直接的益处。较少是关于行为变异和性选择之间的链接,其中雄性只提供精子的物种,而女性选择的优点是由于较高的雄性基因,其增加了体积的性能。我们的研究以性感大小的二态蜘蛛物种为中心,即地中海黑寡妇,这是调查性选择如何形状行为的理想选择。在这个物种中,雄性偏见的操作性别比率导致男性男性竞争,并且侵略性和/或大型男性应该具有选择性的优势。为繁殖力选择了女性,这应该与选择更高的贪婪的选择相关。理论预测,瓦奇地“溢出”进入交配背景,使得对猎物的挥发性与对配合的瓦奇神分相关。我们测试了身体规模和两项行为的方式,男性对竞争对手和女性的侵略,对猎物,影响交配行为,交配成功和性同类主义。我们表明,在这种物种的交配行为中,侵略性的个体变化不会在这种物种的交配行为中发挥直接作用。相反,身体大小会影响男性的男性交配成功和发生性食人鱼的发生。

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