The Prothonotary Warbler (Protonotria citrea) is the only wood warbler in the eastern United States that nests in cavities. It readily accepts nest boxes in lieu of natural breeding sites and therefore provides An excellent model for tests of ecological factors associated with reproductive success. During 1987, 300 nest Boxes were placed along a 30-km transect along the tidal James River in eastern Virginia, and these nest boxes Have been monitored every year through 2000. During the 1999 and 2000 breeding seasons, we collected 2910 Measurements of nestling mass, and recorded ages of parental females, dates of clutch initiation and hatching, Brood sizes, and the number of young that survived to fledging.
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