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1 April 2005 Extra-pair paternity in Seaside Sparrows
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Abstract

Seaside Sparrows (Ammodramus maritimus) nest at varying population densities, and breeding pairs may occupy either large, all-purpose activity spaces or small nesting territories, foraging in undefended areas separate from the nest site. We determined the prevalence of extra-pair paternity in a large, socially monogamous population of Seaside Sparrows nesting in small, overlapping territories. We used six microsatellite DNA markers and a likelihood-based approach to paternity assignment. Five of 47 chicks (11%) in three of 18 broods (17%) in this population were sired by extra-pair males. Although this is the first study of the genetic mating system in the genus Ammodramus, the rate of extra-pair paternity we observed is lower than in most other New World emberizines. As the first measurment of extra-pair paternity in Seaside Sparrows, this study provides a baseline for comparative studies of how extra-pair paternity is influenced by the wide variation in nesting density and territoriality found in Seaside Sparrows. These results, from a socially monogamous sparrow may also provide a context for studies of unusual mating systems in other salt-marsh nesting birds.

Christopher E. Hill and William Post "Extra-pair paternity in Seaside Sparrows," Journal of Field Ornithology 76(2), (1 April 2005). https://doi.org/10.1648/0273-8570-76.2.119
Received: 11 February 2004; Accepted: 1 August 2004; Published: 1 April 2005
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