Inter‐population variation in multiple paternity and reproductive skew in the guppy

摘要: We use microsatellite loci to detail the multiple paternity patterns in broods from 10 wild populations of guppy (Poecilia reticulata) found Northern Trinidad. The span two major drainages comprising Caroni and Oropouche, include sites that are characterized by either high or low predation. Across frequency is with 95% (range: 70%–100%) having sires. Broods have an average 3.5 sires 1–9) a mixed-model analysis suggests predation marginally more than do those sites, but this true only Oropouche drainage. There no difference sire number between Brood size, not female body length, correlated correlation cannot be attributed solely stochastic process associated sperm competition ‘fair raffle’. Within there significant skew reproductive success among males, which may reflect variation competitiveness choice. is, however, different regimes drainages. Finally, were increased genetic variability at loci, suggesting larger effective population size. discuss explanations for degree general lack any differences ecologically populations.