Multiple chromosomal rearrangements in a hybrid zone between Littorina saxatilis ecotypes.
Gastropoda
balancing selection
inversion
linkage disequilibrium
local adaptation
recombination suppression
Journal
Molecular ecology
ISSN: 1365-294X
Titre abrégé: Mol Ecol
Pays: England
ID NLM: 9214478
Informations de publication
Date de publication:
03 2019
03 2019
Historique:
received:
29
06
2018
revised:
07
10
2018
accepted:
08
10
2018
pubmed:
12
12
2018
medline:
28
11
2019
entrez:
12
12
2018
Statut:
ppublish
Résumé
Both classical and recent studies suggest that chromosomal inversion polymorphisms are important in adaptation and speciation. However, biases in discovery and reporting of inversions make it difficult to assess their prevalence and biological importance. Here, we use an approach based on linkage disequilibrium among markers genotyped for samples collected across a transect between contrasting habitats to detect chromosomal rearrangements de novo. We report 17 polymorphic rearrangements in a single locality for the coastal marine snail, Littorina saxatilis. Patterns of diversity in the field and of recombination in controlled crosses provide strong evidence that at least the majority of these rearrangements are inversions. Most show clinal changes in frequency between habitats, suggestive of divergent selection, but only one appears to be fixed for different arrangements in the two habitats. Consistent with widespread evidence for balancing selection on inversion polymorphisms, we argue that a combination of heterosis and divergent selection can explain the observed patterns and should be considered in other systems spanning environmental gradients.
Identifiants
pubmed: 30537056
doi: 10.1111/mec.14972
pmc: PMC6518922
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1375-1393Subventions
Organisme : Göteborgs Universitet
Pays : International
Organisme : Natural Environment Research Council
Pays : International
Organisme : Marie Curie fellowship
ID : 706376
Pays : International
Organisme : H2020 European Research Council
Pays : International
Organisme : Swedish Research Council
Pays : International
Informations de copyright
2018 The Authors. Molecular Ecology Published by John Wiley & Sons Ltd.
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