Is Niagara Falls a barrier to gene flow in riverine fishes? A test using genome-wide SNP data from seven native species

Nathan Lujan, Jason Weir, Brice Noonan, Nathan Lovejoy & Nicholas Mandrak
Since the early Holocene, fish population genetics in the Laurentian Great Lakes have been shaped by the dual influences of habitat structure and post-glacial dispersal. Riverscape genetics theory predicts that longitudinal habitat corridors and unidirectional downstream water-flow drive the downstream accumulation of genetic diversity, whereas post-glacial dispersal theory predicts that fish genetic diversity should decrease with increasing distance from glacial refugia. This study examines populations of seven native fish species codistributed above and below the...
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