The Breeding Bird Survey (BBS) provides the best information on Pine Warbler populations in Canada, and suggests a large increase in population since 1970. Increases are seen in the two Bird Conservation Regions (BCRs) that represent the core of the species' population and for which there are reasonably reliable results (displayed below). This increase is supported by the Atlas of the Breeding Birds of Quebec 2017, which recorded a large increase in the number of squares in which the species was detected, though this may be partly due to increased effort during the second atlas. Both the Maritime Breeding Bird Atlas (Stewart 2015a) and the Ontario Atlas (see table below) demonstrate a dramatic increase in the probability of observation between the first and second atlas periods. The Pine Warbler is at an acceptable level relative to its national population goal (see BBS Canada graph below).
Additional information on: Breeding Bird Survey (BBS) - Canadian analysis
Additional information on: Atlas of the Breeding Birds of Ontario
