Gene flow among populations reduces the potential for local adaptation within each population because many of organisms will contain similar genes regardless of which environment they are in.
Gene flow hinders local adaptation by introducing maladaptive alleles (gene variants) into populations adapted to different environmental conditions than dispersers.
Migrants change the distribution of genetic diversity among populations, by modifying allele frequencies (the proportion of members carrying a particular variant of a gene). High rates of gene flow can reduce the genetic differentiation between the two groups thereby it promotes/increases homogeneity of gene flow.
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