Population status

Tennessee Warbler
(Oreothlypis peregrina)

The Breeding Bird Survey (BBS) provides the best national-level survey for this species. However, coverage of the northern portion of the breeding population is lacking, and so overall reliability is ranked low. The BBS annual indices show that populations increased and decreased markedly in response to spruce budworm outbreaks and declines over the years. However, overall, the BBS indicates that the Canadian population has shown a moderate increase since 1970, despite annual and regional variations. Of the Bird Conservation Regions (BCRs) with reasonably reliable results (displayed below), the Atlantic Northern Forest and the Boreal Hardwood Transition BCRs suggest large decreases in population size since 1970, in contrast to the national trend.

 

Breeding Bird Survey (BBS) - Canadian analysis

Additional information on: Breeding Bird Survey (BBS) - Canadian analysis

Table 1: Population trends by geographic area
Geographic areaTime Period Table 1 - footnote 1 Annual trend Table 1 - footnote 2 Intervals Table 1 - footnote3
LowerUpper
Canada Select to view graph of the geographic area: Canada 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis1970-20121-0.92.8
Boreal Taiga Plains Select to view graph of the geographic area: Boreal Taiga Plains 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis1970-20121.9-0.74.6
Northern Rockies Select to view graph of the geographic area: Northern Rockies 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis1970-20120.4-2.63.4
Boreal Hardwood Transition Select to view graph of the geographic area: Boreal Hardwood Transition 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis1970-2012-3.6-5.6-1.6
Atlantic Northern Forest Select to view graph of the geographic area: Atlantic Northern Forest 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis1970-2012-4.1-5.7-2.4
 

References