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): C.F. Coles; S.J. Petty
    Date: 1997
    Source: In: Duncan, James R.; Johnson, David H.; Nicholls, Thomas H., eds. Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium. Gen. Tech. Rep. NC-190. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 111-118.
    Publication Series: General Technical Report (GTR)
    Station: North Central Research Station
    PDF: View PDF  (101.93 KB)

    Description

    In 1996 we investigated dispersal and survival of juvenile Tawny Owls (Strix aluco) by radio-tracking in Kielder Forest, Northumberland, a man-made conifer forest in northern England. Here, Tawny Owls fed largely on field voles (Microtus agrestis) which exhibited a 3-4 year cycle of abundance, with some spatial asynchrony. Generally, vole numbers were at the low point of the cycle in 1996. Twenty-two nestlings from 11 two-chick broods were radio-tagged when 22-31 (mean 26.3) days old. Birds fledged when 29-36 (mean 32.1) days old. Eight (36.4 percent) owls died 10-106 days after fledging and before dispersing from their natal territories. Five (22.7 percent) owls died outside their natal territories 40-147 days after fledging. Five (22.7 percent) owls disappeared suddenly at 8-51 days after fledging and before the end of the dependence period, and evidence suggested that they were predated. Contact was lost with four (18.2 percent) birds 58-178 days after fledging and after they had begun to disperse. Radio-tracking data are discussed in relation to movement patterns, food resources, and habitat preferences of juvenile owls in the post fledging period.

    Publication Notes

    • Check the Northern Research Station web site to request a printed copy of this publication.
    • Our on-line publications are scanned and captured using Adobe Acrobat.
    • During the capture process some typographical errors may occur.
    • Please contact Sharon Hobrla, shobrla@fs.fed.us if you notice any errors which make this publication unusable.
    • 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

    Coles, C.F.; Petty, S.J. 1997. Dispersal behavior and survival of juvenile Tawny Owls (Strix aluco) during the low point in a vole cycle. In: Duncan, James R.; Johnson, David H.; Nicholls, Thomas H., eds. Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium. Gen. Tech. Rep. NC-190. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 111-118.

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/15436