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Relationships between Coastal South American King and Blue-Eyed Shags

Pamela C. Rasmussen
The Condor
Vol. 93, No. 4 (Nov., 1991), pp. 825-839
DOI: 10.2307/3247717
Stable URL: http://www.jstor.org/stable/3247717
Page Count: 15
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Relationships between Coastal South American King and Blue-Eyed Shags
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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 León 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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