How does reducing gene flow cause population?

Reducing gene flow limits the exchange of genetic material between populations, which can lead to increased genetic divergence. This isolation can enhance the effects of genetic drift and natural selection, allowing populations to adapt to their specific environments. Over time, reduced gene flow may result in the formation of distinct species, as genetic differences accumulate. Additionally, it can increase the risk of inbreeding and decrease overall genetic diversity, potentially compromising the long-term viability of the population.