Population status

Anna's Hummingbird
(Calypte anna)

The Anna's Hummingbird is best monitored in Canada by the Christmas Bird Count (CBC). The species was first reported in British Columbia in the late 1940s and the first breeding event was discovered in 1958 (Campbell et al. 1990). Numbers remained very low until the 1970s, when the species became more widespread on the south coast (Campbell et al. 1990). CBC results from within Canada suggest a large increase in population since the early 1970s. Breeding Bird Survey (BBS) data from Canada are too sparse to calculate a national trend, but range-wide data from both the BBS and CBC indicate large increases in the continental population. Targeted efforts to record birds at feeders during the CBC have increased over time but, despite this bias, the magnitude of the increase and the concordance of results from both the CBC and BBS are sufficient to reliably conclude that the Canadian population of Anna's Hummingbird has experienced a large increase in Canada. The species is at an acceptable level relative to its national population goal (see CBC Canada graph below).

 

Population goal and acceptable levels of variation

Species/groupGoalLower levelUpper level
Anna's HummingbirdMean abundance (2008-2012)10th percentile of observed abundance (1970-2012)Not applicable

Picture of logo Christmas Bird Count (CBC)

Additional information on: Christmas Bird Count (CBC)

Table 1: Population trends by geographic area
Geographic areaTime PeriodAnnual Trend Table 1 - footnote 1 Limits
LowerUpper
Canada Select to view graph of the geographic area: Canada 1970-2016; Christmas Bird Count (CBC)1970-20161612.820.1
North America Select to view graph of the geographic area: North America 1970-2016; Christmas Bird Count (CBC)1970-201643.44.54
 

Breeding Bird Survey (BBS) - Canadian analysis

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

Table 2: Population trends by geographic area
Geographic areaTime Period Table 2 - footnote 1 Annual trend Table 2 - footnote 2 Limits
LowerUpper
Canada Select to view graph of the geographic area: Canada 1974-2016; Breeding Bird Survey (BBS) - Canadian analysis1974-20165.7-0.212.7
North America Select to view graph of the geographic area: North America 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20162.31.73
 

References