Multiple chromosomal rearrangements in a hybrid zone between Littorina saxatilis ecotypes. Issue 6 (25th February 2019)

• Record Type: Journal Article
• Authors: Faria, Rui; Chaube, Pragya; Morales, Hernán E.; Larsson, Tomas; Lemmon, Alan R.; Lemmon, Emily M.; Rafajlović, Marina; Panova, Marina; Ravinet, Mark; Johannesson, Kerstin; Westram, Anja M.; Butlin, Roger K.
• Other Names: Wellenreuther Maren guestEditor.; Mérot Claire guestEditor.; Berdan Emma guestEditor.; Bernatchez Louis guestEditor.
• Is Part Of: Molecular ecology. Volume 28:Issue 6(2019)
• Page Start: 1375
• Page End: 1393
• Publication Date: 2019-02-25
• Subjects: balancing selection -- Gastropoda -- inversion -- linkage disequilibrium -- local adaptation -- recombination suppression; Molecular ecology -- Periodicals; Molecular population biology -- Periodicals; 576
• DOI: 10.1111/mec.14972
• Languages: English
• ISSNs: 0962-1083

Abstract

Abstract: 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.