Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Angela E. Gatto; Teryl G. Grubb; Carol L. Chambers
    Date: 2006
    Source: Journal of Raptor Research 39(4):439-444
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (600 B)

    Description

    We determined food habits of Red-tailed Hawks (Buteo jamaicensis) for comparison with published information for Northern Goshawks (Accipiter gentilis) to evaluate potential competition on the Kaibab Plateau, Arizona. We collected prey remains and pellets from 42 Red-tailed Hawk nests at the end of the nesting season between August-October 1998-2001, and opportunistically from below nest trees during site visits, May-July 2000-01. We identified 478 prey items, including 17 mammal, 7 bird, and 2 reptile species. Prey species frequency did not vary among years (P = 0.3), across habitat types (P = 0.8), or by collection technique (P = 0.4). Annual food niche breadth for Red-tailed Hawks averaged 0.57. Published mean niche breadth for Northern Goshawks was 0.32, supporting that Redtailed Hawks were feeding generalists, while Northern Goshawks were more specialized. However, 48% of Red-tailed Hawk diet on the Kaibab Plateau consisted of species comprising a major portion of the documented diet of Northern Goshawks, including Nuttall's cottontail (Sylvilaps nuttallii), golden-mantled ground squirrel (Spermophilus lateralis lateralis), rock squirrel (S. variegates grammums) , and Northern Flicker (Colaptes auratus). Because raptor communities with high dietary overlap and lack of prey partitioning show food-limited nesting success, greater agnonistic behavior, and territoriality, Red-tailed Hawks could be negatively affecting Northern Goshawks on the Kaibab Plateau.

    Publication Notes

    • You may send email to rmrspubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Gatto, Angela E.; Grubb, Teryl G.; Chambers, Carol L. 2006. Red-tailed hawk dietary overlap with northern goshawks on the Kaibab Plateau, AZ. Journal of Raptor Research 39(4):439-444

    Keywords

    Red-tailed Hawk, Buteo jamaicensis, Northern Goshawk, Accipiter gentilis, competition, diet, food habits, food niche breadth, foraging

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page