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Great Frigatebird Size Dimorphism on Two Central Pacific Atolls

Elizabeth Anne Schreiber and Ralph W. Schreiber
The Condor
Vol. 90, No. 1 (Feb., 1988), pp. 90-99
DOI: 10.2307/1368437
Stable URL: http://www.jstor.org/stable/1368437
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Great Frigatebird Size Dimorphism on Two Central Pacific Atolls
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Abstract

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.

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