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Journal article
Against the Odds: Hybrid Zones between Mangrove Killifish Species with Different Mating Systems
Genes, Vol.12(10), p.1486
09/24/2021
PMID: 34680881
Web of Science ID: WOS:000711766300001
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, Kryptolebias ocellatus (obligately outcrossing) and K. hermaphroditus (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.
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Details
- Title
- Against the Odds
- Publication Details
- Genes, Vol.12(10), p.1486
- Resource Type
- Journal article
- Publisher
- MDPI
- Number of pages
- 14
- Grant note
- 233161/2014-7 / Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) Fisheries Society of the British Isles (FSBI) W461-16 / National Geographic/Waitt program
- Copyright
- © the authors
- Identifiers
- WOS:000711766300001; 99380568996106600
- Academic Unit
- Biology; Hal Marcus College of Science and Engineering
- Language
- English