Population status

Black Swift
(Cypseloides niger)

The Breeding Bird Survey (BBS) is the only source of data available on population change for the Black Swift. BBS results suggest a large population decrease in Canada since the early 1970s. However, this trend estimate has low precision likely because of the species’ flocking habits and propensity to feed at high elevations. Continent-wide BBS analyses, also suggest a large decrease in the North American population since the 1960s.

 

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 Intervals Table 1 - footnote3
LowerUpper
Canada Select to view graph of the geographic area: Canada 1973-2012; Breeding Bird Survey (BBS) - Canadian analysis1973-2012-6.5-10.1-2.6
 

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

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

Table 2: Population trends by geographic area
Geographic areaTime PeriodAnnual trend Table 2 - footnote 1 Limits
LowerUpper
North America Select to view graph of the geographic area: North America 1966-2012; Breeding Bird Survey in North America (BBS) - U.S. analyses1966-2012-6.5-9.8-3.2
 

References