Isolation by distance and non-identical patterns of gene flow within two river populations of the freshwater fish <i>Rutilus rutilus</i> (L. 1758).

In both rivers, the number of gauging weirs was significantly positively correlated with F ST prior to controlling for distance ( p < 0.01; Fig S3), remaining borderline significant in the Thames after accounting for geography (r = 0.216, p = 0.057).

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