Size-dependent ejaculation strategies and reproductive success in the yellow dung fly, Scathophaga stercoraria

Theory predicts that sperm competition will favour the production of larger ejaculates. However, because the benefits of greater reproductive investment are balanced by the costs of spermatogenesis, expenditure should depend on male physiology, mating rate and the relationship between additional investment and fertilization gains. In the yellow dung fly, Scathophaga stercoraria, males adopt size-dependent alternative mating tactics that are...