The Cassin's Vireo was recognised as a distinct species in 1997 when the "Solitary Vireo" complex was split into Cassin's, Blue-headed, and Plumbeous Vireos (American Ornithologists' Union 1997). In Canada, the Cassin's Vireo is largely restricted to the southern half of British Columbia. The species is monitored well by the Breeding Bird Survey. The Canadian population has shown little overall change since the early 1970s, despite fluctuating widely among years. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.
The Cassin's Vireo breeds in coniferous and mixed woodlands, usually those with an open character (Campbell et al. 1997). Since this species tolerates a variety of silvicultural practices, responding neutrally or favourably to thinning and selective logging, there are few management concerns over much of its range (Goguen and Curson 2002). Recent climatic changes and drier winters in the species' breeding range may be contributing to better conditions for the species (Ray et al. 2017).
Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:
Select any of the sub-regions below to view the BCR strategy for additional details.
