Porter, David K., authorRyder, Ronald A., authorNatural Resource Ecology Laboratory, Colorado State University, publisher2015-07-282015-07-281974http://hdl.handle.net/10217/15970March 1974.On cover: Grassland Biome, Ecosystem analysis studies, U.S. International Biological Program.Includes bibliographical references (pages 69-70).Accuracy of several avian census methods was investigated on ten 8.1-ha plots and along a 39.4-km roadside count. Methods included spot-mapping, flushing, total counts, ratios, and roadside and Emlen strip count procedures. Another index of breeding activities was obtained through live-trapping, banding, and color-marking. Data were gathered on nesting success, nesting phenology, nest site selectivity, and growth dates for nestlings.born digitaltechnical reportsengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Bird populations -- Colorado -- Pawnee National GrasslandBirds -- Productivity -- Colorado -- Pawnee National GrasslandBirds -- Colorado -- Pawnee National Grassland -- StatisticsBird surveys -- Colorado -- Pawnee National GrasslandText