Decoupling of rapid and adaptive evolution among seminal fluid proteins in heliconius butterflies with divergent mating systems.

摘要: Reproductive proteins often diverge rapidly between species. This pattern is frequently attributed to postmating sexual selection. Heliconius butterflies offer a good opportunity examine this hypothesis by contrasting patterns of reproductive protein evolution clades with divergent mating systems. Pupal-mating females typically mate only once, limiting for In contrast, adult-mating remate throughout life. therefore predicted be slower and show little evidence positive selection in the pupal-mating clade. We examined prediction sequencing 18 seminal fluid genes from dozen species related outgroup. Two exhibited dN/dS > 1, implicating rapid at least few proteins. However, contrary predictions, average evolutionary rate was greater among Heliconius. Based on these results, we suggest that relaxed constraint can generate conflicting As predicted, some loci may elevated rates promiscuous taxa relative monandrous resulting adaptations when monandry derived (as Heliconius), opposite result selective constraints.