Monitoring bird populations by point countsAuthor(s): C. John Ralph; John R. Sauer; Sam Droege
Source: Gen. Tech. Rep. PSW-GTR-149. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 187 p
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
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DescriptionThis volume contains in part papers presented at the Symposium on Monitoring Bird Population Trends by Point Counts, which was held November 6-7, 1991, in Beltsville, Md., in response to the need for standardization of methods to monitor bird populations by point counts. Data from various investigators working under a wide variety of conditions are presented, and various aspects of point count methodology are examined. Point counts of birds are the most widely used quantitative method and involve an observer recording birds from a single point for a standardized time period. Statistical aspects of sampling and analysis were discussed and applied to the objectives of point counts. Symposium participants agreed upon standards of point counts that should have wide applicability to a variety of habitats and terrain.
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CitationRalph, C. John; Sauer, John R.; Droege, Sam, technical editors 1995. Monitoring bird populations by point counts. Gen. Tech. Rep. PSW-GTR-149. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 187 p
KeywordsBird counts, bird populations, census methodology, evaluation, monitoring, point counts, sampling of populations, standards of censusing
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