Population status

Clark's Nutcracker
(Nucifraga columbiana)

The Breeding Bird Survey (BBS) is the most reliable source of data for the Clark's Nutcracker in Canada and suggests little overall change in the population since the early 1970s. However, the wide annual fluctuations in population (see graph in table below) and poor coverage of the species' high elevations habitat contribute to some uncertainty in this assessment. Christmas Bird Count (CBC) results for North America also suggest little change in the population. The CBC results supplement the BBS and help address the question of habitat coverage, although these results include birds breeding in the United States as well as Canada. Considering the agreement between these two sources, the reliability of this assessment is considered high.

Breeding Bird Survey (BBS) - Canadian analysis

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

View definitions of table column headings being used by: Breeding Bird Survey (BBS) - Canadian analysis

Table 1: Population trends by geographic area
Geographic area	Time Period ^{Table 1 - footnote 1}	Annual trend ^{Table 1 - footnote 2}	Intervals ^{Table 1 - footnote3}
Geographic area	Time Period ^{Table 1 - footnote 1}	Annual trend ^{Table 1 - footnote 2}	Lower	Upper
Canada Select to view graph of the geographic area: Canada 1973-2012; Breeding Bird Survey (BBS) - Canadian analysis	1973-2012	0.5	-1.7	2.5

Christmas Bird Count (CBC)

Additional information on: Christmas Bird Count (CBC)

View definitions of table column headings being used by: Christmas Bird Count (CBC)

Table 2: Population trends by geographic area
Geographic area	Time Period	Annual trend ^{Table 2 - footnote 1}	Limits
Geographic area	Time Period	Annual trend ^{Table 2 - footnote 1}	Lower	Upper
North America	1965-2012	-0.1	-2.6	1.3

References

Tomback, D.F. 1998. Clark's Nutcracker (Nucifraga columbiana), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. Tomback, D.F. 1998. Clark's Nutcracker (Nucifraga columbiana), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. (Link)