Biodiversity and Conservation

, Volume 22, Issue 1, pp 63–75 | Cite as

Long-term decline of a winter-resident bird community in Puerto Rico

  • John Faaborg
  • Wayne J. Arendt
  • Judith D. Toms
  • Katie M. Dugger
  • W. Andrew Cox
  • Miguel Canals Mora
Original Paper


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 Guánica 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.


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



Akaike’s information criteria, corrected for small sample size


West Nile Virus


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Copyright information

© Springer Science+Business Media Dordrecht (outside the USA) 2012

Authors and Affiliations

  • John Faaborg
    • 1
  • Wayne J. Arendt
    • 2
  • Judith D. Toms
    • 1
    • 6
  • Katie M. Dugger
    • 3
    • 7
  • W. Andrew Cox
    • 4
  • Miguel Canals Mora
    • 5
  1. 1.Division of Biological SciencesUniversity of MissouriColumbiaUSA
  2. 2.International Institute of Tropical ForestryUS Forest Service, Sabana Field Research StationLuquilloUSA
  3. 3.Department of Fisheries and WildlifeOregon State UniversityCorvallisUSA
  4. 4.Department of Fisheries and Wildlife SciencesUniversity of MissouriColumbiaUSA
  5. 5.DRNA-Bosque de GuánicaGuánicaUSA
  6. 6.Eco-Logic ConsultingVictoriaCanada
  7. 7.U.S. Geological Survey, Oregon Cooperative Fish and Wildlife Research Unit, Department of Fisheries and WildlifeOregon State UniversityCorvallisUSA

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