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    Author(s): William O. Wirtz
    Date: 1991
    Source: Res. Pap. PSW-209. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 19 p
    Publication Series: Research Paper (RP)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (1.0 MB)

    Description

    Dates were obtained between February 1969 and October 1979 on the seasonal occurrence, habitat association, reproductive phenology, and relative abundance of avifauna at two study sites in the chaparral community of the San Gabriel Mountains of southern California. The purpose of the study was to collect information on bird species use of this habitat and to document changes in the bird community over a 30-year period. During the study, 128 species representing 36 families were noted: 99 in lower elevation(914 to 1280 m) chaparral and 110 at a higher elevation (1400m)chaparral yellow pine ecotone site. Eighty-two species were observed at both sites. Residence comprised 35.4 percent of the population at the lower elevation site and 25.4 percent at the higher site. Vagrants comprised 18.2 percent of the population at the lower site and 23.6 percent at the higher site. Insects are consumed by 66.7 percent of all avifauna observed in the chaparral and seeds by 32.6 percent. Fourteen species reported earlier (1936-1953) at the lower site, mostly migrants, were not observed. Twenty-two species not reported earlier(1936-1953)at the lower site, mostly vagrants, were noted. Breeding of 24 residents and 13 spring breeding species in the chaparral is documented; an additional 11 residents and 5 spring breeding species are considered likely to breed here. The appendix presents a summary of 11 years of data on abundance at both locations.

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    Citation

    Wirtz, William O., II. 1991. Avifauna in southern California chaparral: seasonal distribution, habitat association, reproductive phenology. Res. Pap. PSW-RP-209. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. 19 p

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    Keywords

    bird community, seasonal distribution, avifauna, chaparral, San Gabriel Mountains, southern California

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