菱角萤叶甲雄性竞争策略的可塑性反应

Plasticity Response of Male Competition Strategy in Galerucella birmanica

研究了不同种群密度下菱角萤叶甲雄虫之间竞争的可塑性反应,结果表明,雄虫对雌虫的反应时间(从遇到雌虫到开始交配的时长)随着成虫期生活密度的增加而增加,但与幼虫期的生活密度没有显著关系;交配时长未受到幼虫期生活密度以及成虫期竞争者数量的影响;雄虫精子数量与雄虫幼虫期生活密度以及成虫期竞争者数量无关;雄成虫附腺蛋白含量受到幼虫期生活密度以及成虫期竞争者数量的影响,密度越高、竞争者越多,雄成虫附腺蛋白含量越多。因此,菱角萤叶甲雄虫可根据幼年以及成年后的生存环境对生殖行为和生殖生理做出相应调整,以达到生殖利益最大化。

We tested the plasticity in response of male competition on Galerucella birmanica under different population density. The results indicated that the duration of male response to female increased with the number of male rivals; but the density in stage of larva has no significant effect on duration of male response to female. Mating duration was not affected by larva density or the number of male rivals. The number of sperms was not associated significantly with larva density or the number of male rivals, but proteins content of seminal fluid was affected by larva density or the number of male rivals. The more the male rivals or the higher the larva density is, the more proteins content the seminal fluid had.Therefore, males adjusted behavior and physiology according to the living environment of larva and adult in order to maximize reproductive benefit.