Population status

Western Wood-Pewee
(Contopus sordidulus)

The Breeding Bird Survey (BBS) is the most reliable survey for determining the population status of the Western Wood-Pewee in Canada, although coverage is poorer in the northern parts of the species' breeding range. Like its counterpart, the Eastern Wood-Pewee, BBS results demonstrate a large decrease in abundance of Western Wood-Pewees since the early 1970s. At the regional level, only the Great Basin Bird Conservation Region (BCR) shows a stable population, while all others are showing decreases (results for all BCRs with reasonably reliable BBS results are displayed below). The Western Wood-Pewee is also declining across its continental range, as shown by the BBS results from throughout North America. The species has been the lowest acceptable level relative to its national population goal since the early 1990s (see BBS Canada graph below).

 

Population goal and acceptable levels of variation

Species/groupGoalLower levelUpper level
Western Wood-PeweeMean 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 analysis1970-2016-2.2-3-1.4
Canada Select to view graph of the geographic area: Canada 2006-2016; Breeding Bird Survey (BBS) - Canadian analysis2006-2016-2.4-4.2-0.7
Northern Pacific Rainforest Select to view graph of the geographic area: Northern Pacific Rainforest 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-1.6-3-0.1
Boreal Taiga Plains Select to view graph of the geographic area: Boreal Taiga Plains 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-4.6-6-3.2
Great Basin Select to view graph of the geographic area: Great Basin 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.3-0.61.2
Northern Rockies Select to view graph of the geographic area: Northern Rockies 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-1-1.8-0.1
Prairie Potholes Select to view graph of the geographic area: Prairie Potholes 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-1.4-3.10.5
North America Select to view graph of the geographic area: North America 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-1.1-1.5-0.7
 

References