You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. 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.
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 Ornithologists' Union
Stable URL: http://www.jstor.org/stable/4085840
Page Count: 7
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.
Preview not available
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