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Against the Odds: Hybrid Zones between Mangrove Killifish Species with Different Mating Systems / Waldir Miron Berbel Filho, Andrey Tatarenkov, George Pacheco, Helder M. V. Espírito-Santo, Mateus G. Lira, Carlos Garcia De Leaniz, John C. Avise, Sergio M. Q. Lima, Carlos Rodriquez Lopez, S Consuegra del Olmo

Genes, Volume: 12, Issue: 10, Start page: 1486

Swansea University Authors: Waldir Miron Berbel Filho, Carlos Garcia De Leaniz, Carlos Rodriquez Lopez, S Consuegra del Olmo

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DOI (Published version): 10.3390/genes12101486

Abstract

Different mating systems are expected to affect the extent and direction of hybridization. Due to the different levels of sexual conflict, the weak inbreeder/strong outbreeder (WISO) hypothesis predicts that gametes from self-incompatible (SI) species should outcompete gametes from self-compatible (...

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Published in: Genes
ISSN: 2073-4425
Published: MDPI AG 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa58579
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Abstract: Different mating systems are expected to affect the extent and direction of hybridization. Due to the different levels of sexual conflict, the weak inbreeder/strong outbreeder (WISO) hypothesis predicts that gametes from self-incompatible (SI) species should outcompete gametes from self-compatible (SC) ones. However, other factors such as timing of selfing and unilateral incompatibilities may also play a role on the direction of hybridization. In addition, differential mating opportunities provided by different mating systems are also expected to affect the direction of introgression in hybrid zones involving outcrossers and selfers. Here, we explored these hypotheses with a unique case of recent hybridization between two mangrove killifish species with different mating systems, (obligately outcrossing) and (predominantly self-fertilizing) in two hybrid zones in southeast Brazil. Hybridization rates were relatively high (~20%), representing the first example of natural hybridization between species with different mating systems in vertebrates. All F1 individuals were sired by the selfing species. Backcrossing was small, but mostly asymmetrical with the SI parental species, suggesting pattern commonly observed in plant hybrid zones with different mating systems. Our findings shed light on how contrasting mating systems may affect the direction and extent of gene flow between sympatric species, ultimately affecting the evolution and maintenance of hybrid zones.
Keywords: reproductive isolation, mixed mating, Kryptolebias, self-fertilization, asymmetric introgression
College: College of Science
Funders: Fisheries Society of the British Isles Grant: Small grant research Conselho Nacional de Desenvolvimento Científico e Tecnológico Grant: 233161/2014-7 National Geographic Society Grant: W461-16
Issue: 10
Start Page: 1486