Evolution & Ecology Research Centre, University of New South Wales, Sydney, Australia.
J Evol Biol. 2010 Jun 1;23(6):1321-6. doi: 10.1111/j.1420-9101.2010.01991.x. Epub 2010 Apr 23.
Sexual conflict has recently been proposed as a driving force behind the rapid diversification of genitalia among sexually reproducing organisms. In traumatically inseminating insects, males stab females in the side of the body with needle-like genitalia, ejaculating into their body cavity. Such mating is costly to females and has led to the evolution of cost-reducing 'paragenitalia' in some species. Whereas some consider this evidence of sexually antagonistic coevolution, others remain unconvinced. Variation in the reproductive morphology of both sexes - particularly males - is alleged to be negligible, contradicting the expectations of a coevolutionary arms race. Here, we use a phylogeny of the traumatically inseminating plant bug genus Coridromius to show that external female paragenitalia have evolved multiply across the genus and are correlated with changes in male genital shape. This pattern is characteristic of an evolutionary arms race driven by sexual conflict.
性冲突最近被提出是性繁殖生物生殖器快速多样化的驱动力之一。在创伤性授精的昆虫中，雄性用针状生殖器刺穿雌性身体的一侧，将精液注入其体腔。这种交配对雌性来说代价高昂，导致一些物种进化出了降低成本的“副生殖器”。虽然有些人认为这是性拮抗协同进化的证据，但也有人仍然持怀疑态度。两性（尤其是雄性）的生殖形态的变化据称微不足道，与协同进化军备竞赛的预期相矛盾。在这里，我们使用创伤性授精的植物蝽科 Coridromius 属的系统发育树表明，外部雌性副生殖器在属内已经多次进化，并与雄性生殖器形状的变化相关。这种模式是由性冲突驱动的进化军备竞赛的特征。
