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COSEWIC Assessment and Update Status Report on the Cerulean Warbler in Canada


Assessment Summary

Assessment Summary – May 2003

Common name:
Cerulean Warbler

Scientific name:
Dendroica Cerulea

Special Concern

Reason for designation:
This species breeds in mature deciduous forests in southern Ontario and southwestern Quebec, a habitat which has disappeared from much of its Canadian range in the last 200 years. The species has been steadily declining in numbers (three per cent per annum over the last 30 years), but most of this decline has been occurring in the core of the species' range in the U.S. and numbers may be relatively stable in eastern Ontario. Numbers in southwestern Ontario, however, have declined markedly, and overall numbers in Canada are low - less than 2000 mature individuals. The two dominant limiting factors for this species are habitat destruction on breeding, migration, and wintering grounds, and fragmentation of existing habitats.

Ontario, Quebec

Status history:
Designated Special Concern in April 1993. Status re-examined and confirmed as Special Concern in May 2003. Last assessment based on an update status report.