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The First Case of Female-female Pairing in a Burrow-nesting Seabird
Joël Bried, Marie-Pierre Dubois and Pierre Jouventin
Waterbirds: The International Journal of Waterbird Biology
Vol. 32, No. 4 (December 2009), pp. 590-596
Published by: Waterbird Society
Stable URL: http://www.jstor.org/stable/40660924
Page Count: 7
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Previous reports of female-female pairings in seabirds concerned surface-nesting species only and the genetic relatedness between the two females has been determined only once. Here, the first observation of a female-female pair (detected by molecular sexing) in a burrow-nesting seabird is documented. In 2003, two female Cory's Shearwaters (Calonectns diomedea) were found incubating the same egg, from which a chick hatched. A genetic (microsatellite) analysis showed that the two females were unrelated. This study provides additional evidence that petrel mating systems may be more flexible than initially thought. Female-female pairing in burrow-nesting seabirds might be promoted by similar factors to surface-nesting seabirds, and might have remained undetected until now due to the secretive habits of burrow-nesting seabirds and the low number of genetic studies conducted. Re ceived 15 October 2008, accepted 10 April 2009.
Waterbirds: The International Journal of Waterbird Biology © 2009 Waterbird Society