Gene flow relates to evolutionary divergence among populations at the range margin.
Peter KaňuchBerrit KiehlAnna Cassel-LundhagenAne T LaugenMatthew LowÅsa BerggrenPublished in: PeerJ (2020)
This strongly suggests that restricted gene flow is of major importance for frequencies of alleles that participate in climate-induced selection acting to favour larger phenotypes in isolated populations towards colder latitudes.