Stable species boundaries despite ten million years of hybridization in tropical eels.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
18 03 2020
18 03 2020
Historique:
received:
12
06
2019
accepted:
07
02
2020
entrez:
20
3
2020
pubmed:
20
3
2020
medline:
28
7
2020
Statut:
epublish
Résumé
Genomic evidence is increasingly underpinning that hybridization between taxa is commonplace, challenging our views on the mechanisms that maintain their boundaries. Here, we focus on seven catadromous eel species (genus Anguilla) and use genome-wide sequence data from more than 450 individuals sampled across the tropical Indo-Pacific, morphological information, and three newly assembled draft genomes to compare contemporary patterns of hybridization with signatures of past introgression across a time-calibrated phylogeny. We show that the seven species have remained distinct for up to 10 million years and find that the current frequencies of hybridization across species pairs contrast with genomic signatures of past introgression. Based on near-complete asymmetry in the directionality of hybridization and decreasing frequencies of later-generation hybrids, we suggest cytonuclear incompatibilities, hybrid breakdown, and purifying selection as mechanisms that can support species cohesion even when hybridization has been pervasive throughout the evolutionary history of clades.
Identifiants
pubmed: 32188850
doi: 10.1038/s41467-020-15099-x
pii: 10.1038/s41467-020-15099-x
pmc: PMC7080837
doi:
Substances chimiques
Fish Proteins
0
Banques de données
Dryad
['10.5061/dryad.ncjsxksr1']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
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