Characteristics of Barred Owl (Strix varia) nest sites in Manitoba, Canada

Authors

  • Todd M. Whiklo Department of Biological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2
  • James R. Duncan Wildlife Branch, Manitoba Conservation, Box 24, 200 Saulteaux Crescent, Winnipeg, Manitoba R3J 3W3

DOI:

https://doi.org/10.22621/cfn.v128i1.1548

Keywords:

Barred Owl, Strix varia, habitat, nesting, raptor, Manitoba

Abstract

During 2009 and 2010, nine Barred Owl (Strix varia) nest sites were located in Manitoba, Canada, and data on nest trees, nest structure, and nest site habitat were collected. Nests were located in a variety of tree species, including Balsam Poplar (Populus balsamifera), Paper Birch (Betula papyrifera), Trembling Aspen (Populus tremuloides) and Burr Oak (Quercus macrocarpa). All nests were in tree cavities, and the majority of nests were in dead trees (67%) and had lateral openings (67%). Habitat surrounding nest trees and estimated canopy cover were highly variable. Diameter at breast height of nest trees, cavity width, and cavity depth were consistent and were determined to be the most reliable indicators of nest suitability for breeding Barred Owls. We conclude that the distribution of nesting Barred Owls is influenced more by availability of suitable nest sites than by nest tree species or nest site habitat.

Downloads

Published

2014-03-26

Issue

Section

Articles