Skin color sockeye and kokanee morphs of the Pacific
salmon (Oncorhynchus nerka) raised in a low
carotenoid environment.
Arguments
source
Craig, J.K. and C. Foote. 2001. Countergradient variation
and secondary sexual color: phenotypic convergence
promotes genetic divergence in carotenoid use between
sympatric anadromous and nonanadromous morphs of sockeye
salmon (Oncorhynchus nerka). Evolution 55:
380-391.