Hutton’s vireo (Vireo huttoni huttoni) and western screech-owl (Otus kennicottii kennicottii) are 2 subspecies at risk occupying lowland coniferous or mixed coniferous-deciduous woodlands in the Greater Vancouver and Sunshine Coast areas of British Columbia. Since 1993, we have conducted 43 intensive censuses of the avifauna of 38 sites in this region, including wooded areas proposed for development (84%), and parks and other protected areas (16%). The sampled sites varied from 1.5 to 190 ha, and were all second or third growth, with stand age estimated between 30 and 100 years. We detected Hutton’s vireos and western screech-owls at 51% and 42% respectively of all sites censused, comprising 43% and 64% respectively at sites in the Fraser Valley, 54% and 25% on the Vancouver North Shore, and 71% and 29% on the Sunshine Coast. Highest occurrence of both species was in coniferous habitats, followed by mixed coniferous-deciduous habitats. They were absent in deciduous woodland.
Robertson, Ian, Gebauer, Martin; Ryder, Glenn; Toochin, Rick. 1999. Observations of Two Species at Risk in Mainland Southwestern British Columbia: Hutton's Vireo and Western Screech-Owl (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks; University College of the Cariboo. Proceedings - Conference Biology & Management
Topic: Species and Ecosystems at Risk
Keywords: Greater Vancouver, habitat selection, Hutton’s vireo, land development, Otus kennicottii kennicottii, Sunshine Coast, Vireo huttoni huttoni, western screech-owl