Brewer’s Sparrows (Spizella breweri breweri) are Red-listed in B.C. due to their restricted breeding range in the southern Okanagan Valley and to their threatened shrubsteppe breeding habitat. North American Breeding Bird Survey data indicate that this species has declined significantly throughout its range, extending through the shrubsteppe regions of the western U.S., by 3.9% per year for the last 30 years. The spatial pattern of this decline indicates that it may be most severe in the core of the range with more stable populations around the range periphery. This patterns shows that British Columbia’s population, at the northern range edge, may not only be provincially significant, but, if stable or increasing, could be an important conservation refuge for this species. We are studying the reproductive ecology and population viability of Brewer’s sparrows at 4 sites in B.C.’s south Okanagan to determine if these populations are stable and to examine how reproductive success is related to...
Mahony, N.A., Krannitz, P.G.. 1999. Reproductive Ecology and Population Viability of British Columbia's Endangered Brewer's Sparrow (Spizella breweri breweri) (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks; University College of the Cariboo. Conference Biology & ManagementProceedings
Topic: Species and Ecosystems at Risk
Keywords: brewer's sparrows, red-listed, breeding bird survey, species at risk
Scientific Name: Spizella breweri
English Name: Brewer's Sparrow
Other Identifier: University College of the Cariboo
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