Black-throated Green Warbler
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Alberta lies near the western and northern limits of the breeding distribution of the
Black-throated Green Warbler. The species breeds in the forested portion of Alberta outside of the mountains. The limits of the
Black-throated Green Warbler's breeding range roughly coincide with the limits of the
Boreal, Mixedwood and Boreal Foothills Ecoregions.
The Black-throated Green Warbler is known from the Peace River area of Alberta and is found across the provincial border into British Columbia. The species is reasonably common in the La Crete
- Fort Vermilion area, and is regularly detected along the Peace River. The
Black-throated Green Warbler has also been found at low density in the Rocky Mountain
Foothills, although most published range maps exclude this natural subregion. Site records include Coal Valley, and southeast to Medicine Lake and Brewster Creek.
Black-throated Green Warblers are not known from the Rocky Mountains except as an extremely rare vagrant or migrant. East of the foothills, the southern limit of the
Black-throated Green Warbler's range in Alberta is coincident with the limit of the Boreal Mixedwood
Ecoregion across a line from roughly Mayerthorpe to Cold Lake, where it is found in abundance. The absence of the species in this region suggests a slight northward contraction of its breeding range over the past few decades.