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Sex Ratio of Western Gulls on Santa Barbara Island, California
G. L. Hunt, Jr., J. C. Wingfield, A. Newman and D. S. Farner
Vol. 97, No. 3 (Jul., 1980), pp. 473-479
Published by: American Ornithological Society
Stable URL: http://www.jstor.org/stable/4085840
Page Count: 7
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Female-female pairs constituted at least 10%, perhaps a substantially greater fraction, of the 1972-1978 breeding population of Western Gulls (Larus occidentalis) on Santa Barbara Island, California. In this population, the adult sex ratio was estimated to be 0.67 males per female. This appears to be the consequence of differential survival rates and may have a causal role in the formation of female-female pairs.
The Auk © 1980 American Ornithologists' Union