Replicated origin of female-biased adult sex ratio in introduced populations of the trinidadian guppy (Poecilia reticulata).

摘要: There are many theoretical and empirical studies explaining variation in offspring sex ratio but relatively few that explain adult ratio. Adult ratios important because biased can be a driver of sexual selection will reduce effective population size, affecting persistence shapes how populations respond to natural selection. Previous work on guppies (Poecilia reticulata) gives mixed results, usually showing female-biased However, detailed analysis showed this bias varied dramatically throughout year with no consistent bias. We used mark-recapture approach examine the origin consistency four replicated introductions. show arises predictably is consequence higher male mortality longer female life spans little effect Inconsistencies previous likely due sampling methods design, which should less an issue techniques. Together other long-term studies, our study suggests rarely contributes vertebrates. Rather, differences survival rates longevity determine vertebrate