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The Mourning Warbler, the eastern counterpart to MacGillivray's Warbler, breeds in damp, second-growth woodlands across most of Canada. The Breeding Bird Survey indicates a decline of about 50% in the Canadian population since about 1970. With an estimated 89% of the global breeding population, Canada's responsibility for the Mourning Warbler is very high. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.
This species was thought to have benefited from human disturbance through an increase in available second-growth forests due to clear-cuts, road construction and mining, and has been shown to be adaptable to a range of different forestry practices (Pitocchelli 2011). Therefore, causes for population declines are unclear.
Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:
Select any of the sub-regions below to view the BCR strategy for additional details.