One of the classic budworm followers, populations of this widespread and abundant species fluctuate widely with the increases and decreases of spruce budworm in Canada's boreal forest (Rimmer and Mcfarland 2012). Despite these annual fluctuations, Breeding Bird Survey (BBS) results show little overall change relative to the early 1970s. However, the northern portion of the breeding population is less well covered by the BBS and thus the reliability of this assessment is considered to be medium. The species is likely more common in Canada now than in pre-settlement times, as it has been able to exploit more frequent budworm outbreaks and clearings created by logging (Rimmer and Mcfarland 2012). With virtually all of the global breeding population, Canada's responsibility for the Tennessee 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.
As a spruce budworm specialist, populations of this species are expected to fluctuate with its primary prey (Rimmer and Mcfarland 2012). Although the wintering areas in southern Central America and extreme northern South America are quite restricted, the species appears adaptable to changes in the forest habitat (Rimmer and Mcfarland 2012).
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.
