LOW GENETIC AND PHENOTYPIC DIVERGENCE IN A CONTACT ZONE BETWEEN FRESHWATER AND MARINE STICKLEBACKS: GENE FLOW CONSTRAINS ADAPTATION

Low genetic and phenotypic divergence in a contact zone between freshwater and marine sticklebacks: gene flow constrains adaptation

Abstract Background Distinct hybrid zones and phenotypic and genomic divergence is often observed between marine and freshwater threespine sticklebacks (Gasterosteus aculeatus).Nevertheless, cases also exist where marine-freshwater divergence is diffuse despite seemingly similar environmental Water Bottles settings.In order to assess what character

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