Canada warbler COSEWIC assessment and status report: chapter 11
Technical Summary
Wilsonia canadensis
Canada Warbler – Paruline du Canada
Range of Occurrence in Canada:
Yukon, Northwest Territories, British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Quebec, New Brunswick, Nova Scotia, Prince Edward Island
Extent and Area Information
Population Information
Threats (actual or imminent threats to populations or habitats)
- Habitat loss in wintering grounds due to clearing of primary mountain forest
- Habitat loss/degradation in breeding grounds due to clearing for agriculture, urban development and road development
Rescue Effect (immigration from an outside source)
Quantitative Analysis
None
Current Status
COSEWIC: Threatened (April 2008)
Status and Reasons for Designation
Status: Threatened
Alpha-numeric code: A2b
Reasons for Designation: Most (80%) of the breeding range of this species occurs in Canada. While regional trends may vary, overall the species has experienced a significant long-term decline. This decline is particularly evident in the case of the species’ Canadian range and there is no indication that this trend will be reversed. The reasons for the decline are unclear, but loss of primary forest on the wintering grounds in South America is a potential cause.
Applicability of Criteria
- Criterion A: (Declining Total Population):Meets criterion A2b, with a reduction in population size of > 30% in the last three generations, based on an appropriate index of abundance.
- Criterion B: (Small Distribution, and Decline or Fluctuation): Not applicable - Extent of Occurrence > 20,000 km² and Area of Occupancy > 2,000 km².
- Criterion C: (Small Total Population Size and Decline):Not applicable - total population size > than 10,000.
- Criterion D: (Very Small Population or Restricted Distribution): Not applicable - population size > than 1,000 and Area of Occupancy > than 20 km².
- Criterion E: (Quantitative Analysis): Not applicable.
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