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Populations of this common and widespread species of the boreal forest have fluctuated in response to spruce budworm outbreaks and declines. Results from the Breeding Bird Survey indicate that despite annual fluctuations, populations have shown little overall change since about 1970. Canada's responsibility for the Bay-breasted Warbler is very high, since it is home to an estimated 99% of the global breeding population. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.
The Bay-breasted Warbler breeds primarily in mature coniferous forest in boreal Canada, where its population fluctuates markedly with the abundance of spruce budworm (Venier et al. 2009, Venier et al. 2011). It also relies on mature forest in its relatively restricted wintering range in Central America, where it faces habitat loss due to development. Other than its links with spruce budworm, relatively little is known about its breeding biology, partly due to the remoteness of its breeding range (Venier et al. 2011). The combination of Canada's high responsibility for the Bay-breasted Warbler, poor survey coverage over most of its breeding range, and little information on the breeding biology of this species suggests that this is a species that warrants extra attention.
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.