| male genital size reflects a tradeoff between attracting mates and avoiding predators in two live-bearing fish species. | male genitalia may experience more rapid, divergent evolution than any other animal character, but why? research during the past several decades has culminated in the view that genital diversification primarily results from postmating sexual selection (e.g., sperm competition or cryptic female choice). however, the potential roles of premating sexual selection (e.g., mate choice) and natural selection have received little attention. we examined the possible importance of these mechanisms by inve ... | 2005 | 15894618 |