Multiple chromosomal rearrangements in a hybrid zone between Littorina saxatilis ecotypes

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.

NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Oceanography, Hydrology and Water Resources hsv//eng
NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
balancing selection
Gastropoda
inversion
linkage disequilibrium
local adaptation
recombination
reproductive isolation
local adaptation
gene flow
crossing-over
inversions
evolution
divergence
recombination
selection
barrier
Biochemistry & Molecular Biology
Environmental Sciences & Ecology
Evolutionary Biology

Chaube, P. (author)
Morales, Hernán E.,1985Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences(Swepub:gu)xmorah (author)
Larsson, TomasGothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences (author)
Lemmon, A. R. (author)
Lemmon, E. M. (author)
Rafajlović, Marina,1983Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences(Swepub:gu)xrafma (author)
Panova, Marina,1973Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper, Tjärnö marinlaboratoriet,Department of marine sciences, Tjärnö Marine Laboratory(Swepub:gu)xpanma (author)
Ravinet, M. (author)
Johannesson, Kerstin,1955Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper, Tjärnö marinlaboratoriet,Department of marine sciences, Tjärnö Marine Laboratory(Swepub:gu)xjoker (author)
Westram, A. M. (author)
Butlin, Roger,1955Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper, Tjärnö marinlaboratoriet,Department of marine sciences, Tjärnö Marine Laboratory(Swepub:gu)xbutro (author)
Göteborgs universitetInstitutionen för marina vetenskaper (creator_code:org_t)

By the author/editor: Faria, R.; Chaube, P.; Morales, Hernán ...; Larsson, Tomas; Lemmon, A. R.; Lemmon, E. M.; show more...; Rafajlović, Mari ...; Panova, Marina, ...; Ravinet, M.; Johannesson, Ker ...; Westram, A. M.; Butlin, Roger, 1 ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Oceanography Hyd ...

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