COSEWIC Assessments

COSEWIC Assessment Summary & Status Report: Acadian Flycatcher Empidonax virescens

Assessment Summary – April 2010

Common name
Acadian Flycatcher

Scientific name
Empidonax virescens


Reason for designation
In Canada, this species is restricted to certain types of mature forest in southern Ontario. Only small numbers breed in Canada. Although the population appears to have been relatively stable over the past 10–20 years, this is most likely due to immigration from U.S. populations. The species is threatened by forestry practices, particularly those that target removal of large trees. Serious conservation concerns, both in Canada and the adjacent U.S. also stem from increasingly widespread losses of a variety of favoured nest tree species owing to the spread of an array of exotic forest insects and pathogens. Collectively, these threats to habitat greatly reduce potential for rescue from adjacent U.S. populations.


Status history
Designated Endangered in April 1994. Status re–examined and confirmed in November 2000 and April 2010.


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Contact Person(s)

COSEWIC Secretariat
c/o Canadian Wildlife Service
Environment Canada
Ottawa, ON
K1A 0H3
Tel: 819-938-4125
Fax: 819-938-3984
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Related Species


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