Reinforcement in chorus frogs: lifetime fitness estimates including intrinsic natural selection and sexual selection against hybrids

Evolution; International Journal of Organic Evolution
Emily Moriarty Lemmon, Alan R Lemmon

Abstract

Maladaptive hybridization is hypothesized to be an important force driving the evolution of reproductive isolation between closely related species. Because the magnitude and direction of selection can vary across a life cycle, an accurate understanding of the ubiquity of reinforcement requires fitness to be estimated across the life cycle, but the literature is surprisingly depauperate of such studies. We present fitness estimates of laboratory-raised hybrids between the chorus frogs Pseudacris feriarum and Pseudacris nigrita--two species that have undergone reproductive character displacement where they come into secondary contact. By studying viability, mating success, and fertility across the life cycle, we find strong support for reinforcement as the force driving displacement in this system. Specifically, we find hybrid fitness is reduced by 44%. This reduction results from both sexual selection against hybrid males and natural selection on male fertility, but not viability selection. Sexual selection against hybrid males is four times stronger than natural selection. Hybrid female fitness is not reduced, however, suggesting that Haldane's rule may be operating in this system if males are heterogametic. We also found highe...Continue Reading

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Citations

Dec 20, 2013·Proceedings. Biological Sciences·Yasmin LatourGuila Ganem
Feb 16, 2013·BMC Evolutionary Biology·Frances TylerTom Tregenza
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