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Western Bluebird, Jess Findlay
Photo © Jess Findlay

Photo: Jess Findlay
Breeding evidence - Western Bluebird
Breeding evidence
Probability of observation - Western Bluebird
Probability of observation
Elevation plot - Western Bluebird
Elevation plot

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Western Bluebird
Sialia mexicana
Landscape associations:

Click on plot to view table of mean abundance
Elevation range:
419 - 1215 m
Conserv. status:
BCRISC: Red (Georgia Depression population)
Global importance
of B.C. population:
7
Number of squares
ConfirmedProbablePossiblePoint counts
49 20 29 20
Long-term BBS trends
RegionYearsTrend (conf. interv.) Reliab.
Brit. Col.1970 - 2012 8.16 (5.47 - 11.5)Medium
Canada1970 - 2012 8.16 (5.47 - 11.5)Medium

Mean abundance by region

Bird Conservation Regions [plot]
NW Interior ForestBoreal Taiga PlainsGreat BasinNorthern RockiesN. Pacific Rainforest
   0.10.25  
Ecoprovinces [plot]
N. Boreal Mountains Taiga Plains Boreal Plains Georgia Depression Sub-Boreal Interior
       
S. Interior Mountains Central Interior Southern Interior S. Alaska Mountains Coast & Mountains
0.25  0.1   

Mean abundance by habitat [plot]

Boreal Altai Fescue AlpineBoreal White and Black SpruceBunchgrassCoastal Douglas-fir
  0.12 
Coastal Mountain-heather AlpineCoastal Western HemlockEngelmann Spruce -- Subalpine FirInterior Cedar -- Hemlock
   0.07
Interior Douglas-firInterior Mountain-heather AlpineMontane SpruceMountain Hemlock
0.08   
Ponderosa PineSpruce -- Willow -- BirchSub-Boreal Pine -- SpruceSub-Boreal Spruce
0.1   

Characteristics and Range Found across open woods and meadows of western North America, Western Bluebirds flash their bright blue and rust-coloured plumage as they swoop from low perches to catch insects in mid-air or on the ground. The species reaches the northern limit of its range in southern British Columbia. Although small numbers can often be found in British Columbia during the winter, most retreat to warmer habitats at lower elevations and migrate further south within their breeding range (Campbell et al. 1997, Guinan et al. 1998). Birders, naturalists, land managers and biologists are working together to reintroduce and restore Western Bluebird populations to their historic breeding range in the Georgia Depression along the Pacific Coast.

Distribution, Abundance, and Habitat Western Bluebird distribution is limited to southern British Columbia, where it is most numerous at elevations below 750 m in the Southern Interior Ecoprovince, primarily in the Okanagan Valley, followed by the East Kootenay Valley in the Southern Interior Mountains Ecoprovince. This pattern is similar to that known when The Birds of British Columbia was published in 1997. Breeding birds are also sparsely scattered throughout these ecoprovinces and in southern parts of the Central Interior and Georgia Depression Ecoprovince.

On the coast, Western Bluebirds prefer open habitats in Garry Oak (Quercus garryana) woodland. In the interior, they prefer Ponderosa Pine (Pinus ponderosa) and Douglas-fir (Psuedotsuga menziesii) habitats with grassy or forb-filled openings interspersed with trees. They nests in cavities excavated by Northern Flickers, and readily use nest boxes (Campbell et al. 1997, Guinan et al. 1998).

Conservation and Recommendations While the Breeding Bird Survey marks population increases in the Great Basin and Northern Rockies Bird Conservation Regions (Environment Canada 2014, Sauer et al. 2014), Western Bluebirds continue to decline along the Pacific Coast, remaining well below historic population and distribution in the Georgia Depression Ecoprovince, which is why this coastal population is on the provincial Red List. The main threats to Western Bluebirds, especially on the coast, continue to be the loss and degradation of lowland open forested habitat due to fire suppression, urbanization, snag removal, logging and changes in agricultural practices, and contaminant loading of the prey base especially on the coast (Guinan et al. 1998). Introduced European Starlings and House Sparrows also compete for nesting cavities. The Garry Oak Ecosystem Recovery Team and partners in the United States continue to translocate pairs of bluebirds from a healthy coastal population in neighbouring Washington. In 2012, the first Western Bluebirds since 1995 hatched on Vancouver Island (GOERT 2015).

Wendy E. Easton

Recommended citation: Easton, W.E. 2015. Western Bluebird in Davidson, P.J.A., R.J. Cannings, A.R. Couturier, D. Lepage, and C.M. Di Corrado (eds.). The Atlas of the Breeding Birds of British Columbia, 2008-2012. Bird Studies Canada. Delta, B.C. http://www.birdatlas.bc.ca/accounts/speciesaccount.jsp?sp=WEBL&lang=en [16 Dec 2018]

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