Subject: Re: migrant nonwave
Date: Aug 24 12:02:46 1995
From: Don Baccus - donb at Rational.COM


Alvaro:
> Don's comments on hawks are interesting. Here in the county, people are
>seeing Sharpies and Cooper's Hawks daily at different sites. There does not
>seem to be a lack of hawks when you get down here, so perhaps northern
>California had a good year. Many of the birds being seen are juveniles.

>From the limited recovery information we have, nearly all of the
birds passing over the Goshutes site breed east of the Cascades.
Though we do have one spring recovery (of a by-then adult sharpie
or Coop, I forget which) due north of Seattle!

The last time I looked - a couple of years ago - 100% of the winter
band recoveries of sharpies and Coops banded at the Golden Gate project
in the Marin Headlands which were far enough south had come from
Baja, not the mainland. Our Goshutes sharpies/Coops mostly come
from Sinaloa and Sonora, so the populations seem to take different
routes with different end-points for the most part.

Regarding production, I know Salt Lake City had something like a
foot of snow fall in May or possibly even June (anyone remember?),
the result of a storm system that dumped on much of the Intermountain
West. I mean in the city, not just the Rockies just to the east!
Such an event can be pretty disrupting...

Apparently they've had a couple of fronts pass through the Goshutes
already, but not bringing birds (we get our biggest movements just
in front of fronts coming from the northwest, often just about the time
the front's bashing the PNW).

- Don Baccus, Portland OR <donb at rational.com>