Population status

Fox Sparrow
(Passerella iliaca)

The Breeding Bird Survey (BBS) is considered the best source of population data available for the Fox Sparrow, although it covers only the extreme southern edge and some western and eastern sections of the breeding population. The BBS results suggest a relatively unchanged population since about 1970. While the Christmas Bird Count (CBC) results include birds breeding in both Canada and the United States, the trend is dominated by Canadian birds, which make up about 60% of the continental population. In addition, the CBC provides very good coverage of the wintering range of this species. CBC results show the continental wintering population has shown little overall change since 1970.

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 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	-0.3	-4.9	3.8

Breeding Bird Survey in North America (BBS) - U.S. analyses

Additional information on: Breeding Bird Survey in North America (BBS) - U.S. analyses

View definitions of table column headings being used by: Breeding Bird Survey in North America (BBS) - U.S. analyses

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 Select to view graph of the geographic area: North America 1966-2012; Breeding Bird Survey in North America (BBS) - U.S. analyses	1966-2012	-0.7	-2.7	0.8

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 3: Population trends by geographic area
Geographic area	Time Period	Annual trend ^{Table 3 - footnote 1}	Limits
Geographic area	Time Period	Annual trend ^{Table 3 - footnote 1}	Lower	Upper
North America	1965-2012	0.8	0.3	1.2

References

Weckstein, J.D., D.E. Kroodsma and R.C. Faucett. 2002. Fox Sparrow (Passerella iliaca), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. Weckstein, J.D., D.E. Kroodsma and R.C. Faucett. 2002. Fox Sparrow (Passerella iliaca), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. (Link)