Abstract
The distributions of King and Blue-eyed Shags (Phalacrocorax albiventer and P. atriceps) were reevaluated, incorporating new data. The differential distributions of the phenotypes do not correlate significantly with austral summer water temperatures. In areas where the forms occur together, hybridization is frequent and plumage-based disassortative mating occurs. At localities of overlap, King and Blue-eyed Shags are virtually identical in skeletal size and shape. Heterozygosity is very similar for both forms over all populations and at Puerto Deseado, but not for the Monte Le6n and Ushuaia populations. Genetic distances between the two forms are very low. King and Blue-eyed Shags should be considered conspecific color morphs of a single widespread species, Phalacrocorax atriceps.
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