Color polymorphism provides a tractable window into how selection, gene flow, and ecology interact to maintain phenotypic diversity and initiate divergence. I investigate the ecological and genomic bases of sympatric light and melanistic morphs in two reef hawkfishes,Paracirrhites arcatusandP. hemistictus, across Guam andHawai‘i. ForP. arcatusrevealed substantially lower density on Guam (0.086 ind/m²) than reported for Hawai‘i (0.292 ind/m²) and a …
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