If you need an accessible version of this item please contact JSTOR User Support

Diet of Northern Saw-Whet Owls in Southern Wisconsin

Scott R. Swengel and Ann B. Swengel
The Condor
Vol. 94, No. 3 (Aug., 1992), pp. 707-711
DOI: 10.2307/1369255
Stable URL: http://www.jstor.org/stable/1369255
Page Count: 5
  • Download PDF
  • Cite this Item

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If you need an accessible version of this item please contact JSTOR User Support
Diet of Northern Saw-Whet Owls in Southern Wisconsin
Preview not available

Abstract

We measured and analyzed 1,148 pellets of Northern Saw-whet Owls (Aegolius acadicus) in Sauk County, Wisconsin from 1986 to 1990. Pellets averaged 3.03 cm long × 1.50 cm wide, and contained 0.645 prey individuals/pellet. Rodents comprised 84.5% of prey individuals and 92.0% of biomass in Saw-whet Owl diets. Deer mice (Peromyscus leucopus and P. maniculatus) comprised 67.7%, voles (Microtus pennsylvanicus and M. ochrogaster) 16.1%, and shrews (Blarina brevicauda and Sorex cinereus) 8.6% of prey individuals. The owls also ate songbirds, insects, and a bat. The owls' food-niche breadth was 2.17.

Page Thumbnails

  • Thumbnail: Page 
707
    707
  • Thumbnail: Page 
708
    708
  • Thumbnail: Page 
709
    709
  • Thumbnail: Page 
710
    710
  • Thumbnail: Page 
711
    711