Population status

Black-headed Grosbeak
(Pheucticus melanocephalus)

The Breeding Bird Survey (BBS) provides the best available data for Black-headed Grosbeak in Canada with good coverage of the species' range. BBS results indicate an almost 95% increase in the national population, with the highest rate of increase during the most recent period (2006-2016). At the regional level, the greatest increases are seen in the Northern Rockies and Great Basin Bird Conservation Regions (BCRs). The population trend in the Northern Pacific Rainforest BCR is within the bounds considered to have shown little overall change relative to 1970. At the continental level, BBS data from throughout North America also indicate an increase though to a lesser extent than in Canada. The Black-headed Grosbeak is at an acceptable level relative to its national population goal (see graph for Canada below).

 

Population goal and acceptable levels of variation

Species/groupGoalLower levelUpper level
Black-headed GrosbeakMean 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 analysis1970-20161.50.52.4
Canada Select to view graph of the geographic area: Canada 2006-2016; Breeding Bird Survey (BBS) - Canadian analysis2006-20162.2-0.14.5
Northern Pacific Rainforest Select to view graph of the geographic area: Northern Pacific Rainforest 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.3-0.81.4
Great Basin Select to view graph of the geographic area: Great Basin 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20164.836.6
Northern Rockies Select to view graph of the geographic area: Northern Rockies 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20165.43.57.3
North America Select to view graph of the geographic area: North America 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.70.51
 

References