Population status

Blue Jay
(Cyanocitta cristata)

The Blue Jay is well monitored by the Breeding Bird Survey (BBS), which covers a large portion of the species' breeding population in Canada. BBS results indicate that numbers have increased by about 80% since 1970. This increase has been relatively steady throughout the survey period, though it appears to have stabilized somewhat during the most recent period (2006-2016). Interestingly, BBS data from throughout North America (the bulk of which come from the United States) suggest a small but steady decrease in the number of Blue Jays. Causes for the disparity in the trends are unclear. The Blue Jay is 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
Blue JayMean abundance (2008-2012)Mean long-term abundance (1970-2012) 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 analysis1970-20161.30.91.6
Canada Select to view graph of the geographic area: Canada 2006-2016; Breeding Bird Survey (BBS) - Canadian analysis2006-20162.71.83.7
Boreal Taiga Plains Select to view graph of the geographic area: Boreal Taiga Plains 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.3-0.81.2
Boreal Softwood Shield Select to view graph of the geographic area: Boreal Softwood Shield 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20162.313.6
Prairie Potholes Select to view graph of the geographic area: Prairie Potholes 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20161.402.8
Boreal Hardwood Transition Select to view graph of the geographic area: Boreal Hardwood Transition 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20161.10.71.6
Lower Great Lakes / St. Lawrence Plain Select to view graph of the geographic area: Lower Great Lakes / St. Lawrence Plain 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20162.11.62.7
Atlantic Northern Forest Select to view graph of the geographic area: Atlantic Northern Forest 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.90.41.3
North America Select to view graph of the geographic area: North America 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-2016-0.5-0.6-0.4
 

References