The relationship between ROM and PC1 or melanin scores was significantly strong and marginally nonsignificant, respectively, with an alternative phylogeny.
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This relationship weakened when species with iridescent plumage were excluded (marginally significant between ROM levels and PC1, and nonsignificant between ROM and raw eumelanin or pheomelanin scores), and stronger for all three melanin variables when only species with N ≥ 3 individuals were included in the models (Tables S3–S9 ).