Dear Stephen and others,
The early history of our San Francisco Bay feral birds has been published as:
Lidicker, W. Z., Jr., and F. C.
McCollum. 1979. Canada Goose established as a
breeding species in San Francisco Bay. West. Birds 10:159162.
This is accessible on SORA. I think the best
discussion of local introductions is by David
Shuford in the Marin County breeding bird atlas (now out of print).
Shuford, W. D. 1993. Canada Goose (Branta
canadensis). Marin County Breeding Bird Atlas,
pp. 104105. Bushtit Books, Bolinas, CA.
David suggests that these birds were purposely
introduced to the S. F. Bay area, although the
reasons are unclear. I have also discussed the
expansion of these feral geese into South Bay (about 1986) in:
Bousman, W. G. 2007. Canada Goose (Branta
canadensis). Breeding Bird Atlas of Santa Clara
County, California, pp. 102103. Santa Clara
Valley Audubon Society, Cupertino, CA.
A copy of the atlas can be ordered from the Santa
Clara Valley Audubon website. Non-migratory (or
feral) Canada Geese have been widely introduced
south of their historic range throughout the
United States. Everywhere they have been
introduced they have become a nuisance.
At 12:48 PM 7/14/2008, Stephen M.H. Braitman wrote:
>I apologize if this is off-topic, but it would be nice to get some
>illumination on a subject that has puzzled me for a few years. When I
>first arrived in the Bay Area in 1969, and throughout the '70s, a
>Canada Goose was a pretty rare siting in San Francisco and Berkeley.
>Now, of course, they're everywhere, close to being a nuisance in some
>places! What I'd like to know is when did the Bay Area start becoming
>a home base for either a migrating or resident population of Canada
>geese? This must have happened in the 1980s (?). Have there been any
>studies on this subject? Any research into understanding why this
>situation changed so dramatically? Thanks very much!
>Stephen M.H. Braitman
>San Rafael, CA