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    Description

    Despite concern expressed two decades ago, there has been little recent discussion about continuing declines of migrant bird populations. Monitoring efforts have been focused almost exclusively on the breeding grounds. We describe the long-term decline of a winter-resident bird population in Guanica Commonwealth Forest, Puerto Rico, one of the last remaining tracts of high-quality tropical dry forests in the Caribbean. The winter bird community has exhibited dramatic declines, with constant-effort mist netting now capturing about one-third as many birds as it did 20 years ago. Population estimates for the three most common species have declined dramatically, even though survival rates have remained constant, and other species are now virtually absent from a site where they once were fairly common. Although explanations for these declines are speculative, particularly because they involve multiple species, we argue that the strength and duration of these declines in well-preserved dry forest within a biosphere reserve should stimulate renewed discussion of migrant population trends and comparison with other recent monitoring activities.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Faaborg, J.; Arendt, W. J.; Toms, J. D.; Dugger, K. M.; Cox, W. A.; Canals Mora, M. 2013. Long-term decline of a winter-resident bird community in Puerto Rico. Biodiversity and Conservation 22:63-75.

    Keywords

    American Redstart, Black-and-white Warbler, Ovenbird, Partners in Flight, Songbird population declines

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https://www.fs.usda.gov/treesearch/pubs/44179