Amitin E G, Pitnick S
Department of Biology, Syracuse University, Syracuse, NY 13244-1270, USA.
J Evol Biol. 2007 Jan;20(1):381-91. doi: 10.1111/j.1420-9101.2006.01184.x.
Length of the sperm flagellum and of the female's primary sperm-storage organ, the seminal receptacle (SR), exhibit a pattern of rapid correlated evolution in Drosophila and other lineages. Experimental evolution studies with Drosophila melanogaster indicate that these traits have coevolved through sexual selection, with length of the SR representing the proximal basis of female sire discrimination, biasing paternity according to sperm length. Here, we examine the impact of experimentally varying the developmental environment, including larval density and larval and adult nutrition, on sperm length, SR length and on the pattern of sperm precedence. Expression of SR length was far more sensitive to variation among developmental environments than was sperm length. Nevertheless, there was striking co-variation in sperm and SR length. The developmental environment of both females and second males, but not first males, significantly contributed to variation in male competitive fertilization success.
精子鞭毛的长度以及雌性的主要精子储存器官——受精囊（SR）的长度，在果蝇和其他谱系中呈现出快速协同进化的模式。对黑腹果蝇进行的实验进化研究表明，这些性状通过性选择共同进化，SR的长度代表雌性对父本识别的近端基础，根据精子长度使父权产生偏差。在这里，我们研究了实验性改变发育环境（包括幼虫密度以及幼虫和成虫营养）对精子长度、SR长度以及精子优先模式的影响。SR长度的表达对发育环境变化的敏感性远高于精子长度。然而，精子和SR长度之间存在显著的共同变化。雌性和第二只雄性（而非第一只雄性）的发育环境对雄性竞争受精成功的差异有显著影响。
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