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Five populations A-E of damselflies are located along a river bank. The species has two genetically determined and heritable morphs, light and dark, with ratios indicated in the pie diagrams above. • The upstream populations C, D, and E are situated on black rock, while the downstream populations A and B live on white sand. • Bird predators use visual cues to detect the damselflies.• Damselflies who attempt to leave their habitat can migrate 1 km with 90% success and up to 5 km with 1% success. No damselflies have been observed migrating further than 10 km.• All five populations are large in size with approximately the same numbers of individuals.Which evolutionary mechanism can best explain why light morphs are more abundant than dark morphs in Population A in the presence of bird predators?

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