Multiple mating by females increases both the risk and intensity of sperm competition for males. The ability to temporarily or permanently inhibit female receptivity to further mating represents a highly adaptive strategy to reduce the risk of sperm competition. Males of the West Indian sweet potato weevil Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) and the seed bug Togo hemipterus (Scott) (Heteroptera: Lygaeidae) use accessory gland substances to inhibit remating in females. It is known that there is variance in the length of the female refractory period (i.e., the effectiveness of male ejaculate substances that inhibit female remating) within a species. However, it is unclear what types of male traits affect the length of the female refractory period. The mechanism of the female refractory period is not sufficiently revealed. We focused on male body size, which is often a target of sexual selection, and investigated the relationship between male body size and both the refractory period of females and mating duration. Contrary to our thought, male body size did not significantly influence the refractory period of females or mating duration in either species. Smaller male body size was not particularly favored by post-copulatory sexual selection in either species.

中文翻译：

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雄性体型不影响西印度甘薯象鼻虫 Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) 和种虫 Togo hemipterus (Scott) (Heteroptera: Lygaeidae) 中雌性的不应期

雌性多次交配会增加雄性精子竞争的风险和强度。暂时或永久抑制雌性接受进一步交配的能力代表了降低精子竞争风险的高度适应性策略。西印度甘薯象鼻虫 Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae) 和种虫 Togo hemipterus (Scott) (Heteroptera: Lygaeidae) 的雄性使用附属腺物质来抑制雌性的复交。众所周知，一个物种内雌性不应期的长度（即雄性射精抑制雌性再交配的物质的有效性）存在差异。然而，尚不清楚哪些类型的男性特征会影响女性不应期的长度。女性不应期的机制尚未充分揭示。我们关注通常是性选择目标的雄性体型，并研究了雄性体型与雌性不应期和交配持续时间之间的关系。与我们的想法相反，雄性体型没有显着影响雌性的不应期或两种物种的交配时间。两个物种的交配后性选择都不太喜欢较小的雄性体型。