Williamson's sapsucker (Sphyrapicus thyroideus) COSEWIC assessment and status report

Official title: COSEWIC Assessment and Update Status Report for the Williamson's Sapsucker (Sphyrapicus thyroideus) in Canada COSEWIC Assessment and Update Status Report on the Williamson's Sapsucker Sphyrapicus thyroideus in Canada

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Table of contents

• Assessment Summary
• Executive Summary
• Species Information
• Distribution
• Habitat
• Biology
• Population Sizes and Trends
• Limiting Factors and Threats
• Special Significance of the Species
• Existing Protection or Other Status Designations
• Technical Summary
• Acknowledgements and Authorities Contacted
• Information Sources
• Biographical Summary of Report Writer

COSEWIC status reports are working documents used in assigning the status of wildlife species suspected of being at risk. This report may be cited as follows:

COSEWIC 2005. COSEWIC assessment and status report on the Williamson's Sapsucker Sphyrapicus thyroideusin Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. vii + 45 pp.

Production note:

COSEWIC would like to acknowledge Les W. Gyug for writing the status report on the Williamson's Sapsucker Sphyrapicus thyroideus prepared under contract with Environment Canada, overseen and edited by Dick Cannings, the COSEWIC Birds Species Specialist Subcommittee Co-chair.

Également disponible en français sous le titre Ếvaluation et Rapport de situation du COSEPAC sur le spatulaire (Polyodon spathula) au Canada – Mise à jour.

Cover illustration:
Williamson's Sapsucker -- Male (left) and female (right) Williamson's Sapsuckers at a nest hole in a Trembling Aspen, Copper Mountain Road, Princeton, British Columbia, June 2001. Photos by Les W. Gyug.

©Her Majesty the Queen in Right of Canada 2005
Catalogue No. CW69-14/452-2005E-PDF
ISBN 0-662-40687-7
HTML: CW69-14/452-2005E-HTML
0-662-40688-5