Population status

Tennessee Warbler
(Oreothlypis peregrina)

The Breeding Bird Survey (BBS) provides the best national-level survey for this species. The BBS annual indices show that the population has increased and decreased markedly over the years, likely in response to spruce budworm outbreaks and declines. Population levels among regions vary widely. 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 large increase in the Northern Rockies population. Despite these fluctuations, the national population has consistently remained at an acceptable level relative to its national population goal (see BBS Canada graph below).

 

Population goal and acceptable levels of variation

Species/groupGoalLower levelUpper level
Tennessee WarblerMean abundance (first 5 years of survey)Goal minus 25% Not applicable

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 Limits
LowerUpper
Canada Select to view graph of the geographic area: Canada 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.2-1.11.5
Canada Select to view graph of the geographic area: Canada 2006-2016; Breeding Bird Survey (BBS) - Canadian analysis2006-2016-0.1-2.52.8
Northern Rockies Select to view graph of the geographic area: Northern Rockies 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20163.50.66.2
Prairie Potholes Select to view graph of the geographic area: Prairie Potholes 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-0.6-3.62.2
Boreal Hardwood Transition Select to view graph of the geographic area: Boreal Hardwood Transition 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-3.6-5.2-1.9
Atlantic Northern Forest Select to view graph of the geographic area: Atlantic Northern Forest 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-3.8-5.2-2.3
North America Select to view graph of the geographic area: North America 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.2-1.11.5
 

References