Yamane Takashi, Miyatake Takahisa
Laboratory of Evolutionary Ecology, Graduate School of Environmental Science, Okayama University, Okayama 700-8530, Japan.
J Insect Physiol. 2005 Nov;51(11):1240-3. doi: 10.1016/j.jinsphys.2005.07.001. Epub 2005 Aug 15.
Optimal sperm allocation should differ according to the level of polyandry within a population, because the risk of sperm competition depends on the re-mating frequency of females. We compared the number of sperm ejaculated by males into the female reproductive organ between strains with different levels of polyandry in the adzuki bean beetle, Callosobruchus chinensis (Coleoptera: Bruchidae) when males were reared in different larval densities in a bean. The results showed that males derived from a population with a higher level of polyandry increased ejaculatory expenditure when they were reared under higher larval densities. We discuss the evolutionary correlation of ejaculatory expenditure to the level of polyandry.
最佳精子分配应根据种群内一妻多夫的程度而有所不同，因为精子竞争的风险取决于雌性的再次交配频率。我们比较了在豇豆中以不同幼虫密度饲养雄性时，不同一妻多夫程度的小豆象甲（Callosobruchus chinensis，鞘翅目：豆象科）品系的雄性射入雌性生殖器官的精子数量。结果表明，来自一妻多夫程度较高种群的雄性在较高幼虫密度下饲养时，射精量会增加。我们讨论了射精量与一妻多夫程度的进化相关性。
