Past lake shore dynamics explain present pattern of unidirectional introgression across a habitat barrier.

ABSTRACT: Introgression patterns between divergent lineages are often characterized by asymmetry in the direction and among-marker variation in the extent of gene flow, and therefore inform on the mechanisms involved in differentiation and speciation. In the present study, we test the hypothesis that unidirectional introgression between two phenotypically and genetically distinct lineages of the littoral, rock-dwelling cichlid fish Tropheus moorii across a wide sandy bay is linked to observed differences in mate preferences between the two lineages. This hypothesis predicts bi-directional nuclear gene flow and was rejected by congruent patterns of introgression in mtDNA, AFLP and microsatellite markers, with admixture confined to the populations west of the bay. This pattern can be explained

SUBMITTER: Sefc KM 

PROVIDER: S-EPMC6557712 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature