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    Author(s): C. John Ralph; Sam Droege; John R. Sauer
    Date: 1995
    Source: In: Ralph, 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: p. 161-168
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (357 KB)

    Description

    The use of population size as a measure of health of a species has been a very common tool of ornithologists for many years (Lack 1954, 1966; Hutchinson 1978). Methods for surveying population size are detailed in Ralph and Scott (1981), the excellent compendium by Cooperrider and others (1986), and the manual by Koskimies and Vaisanen (1991). Many types of counting techniques are available to estimate relative abundance and population trends. Probably the most widely used are modifications of unlimited distance point counts (Blondel and others 1981), conducted at a series of counting stations. These often represent the best compromise between economy of collection effort and precision and accuracy of the estimates of population trends or population indexes (Verner 1985).

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    Citation

    Ralph, C. John; Droege, Sam; Sauer, John R. 1995. Managing and Monitoring Birds Using Point Counts: Standards and Applications. In: Ralph, 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: p. 161-168

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