Data from: Shared and non-shared genomic divergence in parallel ecotypes of Littorina saxatilis at a local scale

Mark Ravinet, Anja Westram, Kerstin Johannesson, Roger Butlin, Carl André & Marina Panova
Parallel speciation occurs when selection drives repeated, independent adaptive divergence that reduces gene flow between ecotypes. Classical examples show parallel speciation originating from shared genomic variation, but this does not seem to be the case in the rough periwinkle (Littorina saxatilis) that has evolved considerable phenotypic diversity across Europe, including several distinct ecotypes. Small ‘wave’ ecotype snails inhabit exposed rocks and experience strong wave action, while thick-shelled, ‘crab’ ecotype snails are larger and experience crab...
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