I suspect that the apparent range expansion of the Am White Pelican may be
the result of the decline of the effects of DDT in the environment. DDT
decimated Brown Pelicans along the west coast in the 50s and 60s. I
recall Brown Pelican being a hotline bird in the late 70s and early 80s at
Ocean Shores. Of course now they are abundant along the Washington Coast
as post or non-breeders.
Does anyone know of literature describing pre-DDT Am White Pelican
distribution? Were their eggs seriously affected by that chemical? Is
their mode of incubation similar to Brown Pelican which involves standing
on the eggs, securing them beneath the web of the 1st and rear toes, and
thus making them especially susceptible to breakage with DDT-thinned
Scott R a y
PS: I saw a male Mountain Bluebird near my place this morning, 4 miles NE
of Moxee. This is quite unusual.