Vesper sparrow (Pooecetes gramineus affinis) COSEWIC assessment and status report: chapter 9
Special Significance of the Species
The distribution of Coastal Vesper Sparrows is extremely restricted and populations in all jurisdictions are declining. This subspecies is separated from interior Vesper Sparrows by the coastal mountain ranges. As such, the subspecies forms a disjunct population. Disjunct populations contribute to the genetic diversity of the species and are important for the evolution of species (Hunter and Hutchinson 1994).
In Canada, Coastal Vesper Sparrows occur only in southwestern British Columbia where it is one of the few vertebrates that is associated with the rare Garry oak and associated ecosystems. Suitable habitat in the region is very limited and development pressures continue at the remaining potential habitat. The Coastal Vesper Sparrow has been identified by GOERT as a priority vertebrate species for recovery efforts. Any success in maintaining and restoring habitat for Vesper Sparrows within the Garry oak and associated ecosystems will also benefit other, less well known species.
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