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Great Frigatebird Size Dimorphism on Two Central Pacific Atolls
Elizabeth Anne Schreiber and Ralph W. Schreiber
Vol. 90, No. 1 (Feb., 1988), pp. 90-99
Published by: American Ornithological Society
Stable URL: http://www.jstor.org/stable/1368437
Page Count: 10
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We examine sexual size dimorphism in Great Frigatebirds (Fregata minor) on Johnston Atoll and Christmas Island, Central Pacific Ocean, using univariate and multivariate analyses. Adults are larger on Johnston than on Christmas in the four variables measured (culmen, wing, tail, and mass), but greater dimorphism between the sexes exists on Christmas. We relate these morphological data to environmental variability and predictibility and the various published hypotheses on the evolution of sexual size dimorphism.
The Condor © 1988 Cooper Ornithological Society