Bird abundance - point counts

Measurements of bird abundance are taken annually or more frequently in the 9 ha grid (5/89 to 6/90) and Luquillo Forest Dynamics Plot (10/90 to present) at El Verde, in Bisley Watersheds 1 and 2 (6/89 to 5/91), and in Whendee Silver’s cut plots at Bisley (5/89 to 2/90). Support for this work was provided by grants BSR-8811902, DEB-9411973, DEB-9705814 , DEB-0080538, DEB-0218039 , DEB-0620910 , DEB-1239764, DEB-1546686, and DEB-1831952 from the National Science Foundation to the University of Puerto Rico as part of the Luquillo Long-Term Ecological Research Program. Additional support provided by the University of Puerto Rico and the International Institute of Tropical Forestry, USDA Forest Service.