Date: 1/9/19 9:19 am From: <clearwater...> Subject: [obol] Re: Common birds: Bewick's Wrens and Golden-crowned sparrows
Hi Jeff (& All),
Thanks for your comment. This is exactly the type of response that I was hoping for: observations from reasonably long transects through habitat that normally hosts good numbers of these species.
I took a look at the numbers for Willamette Valley CBCs that have compiled results so far, compared with averages for the past two winters (see attachment, italics indicate preliminary data).
For Bewick's Wren, of three CBCs that averaged more than 50 per count and have reported results for this year (Airlie-Albany, Eugene, and Salem), all showed an increase of 34% or more. The net increase for CBCs that have reported numbers so far is 43%.
For Golden-crowned Sparrow, there are four CBCs that averaged more than 500 per count and have reported results for this year (Eugene, Airlie-Albany, Salem, and Yamhill Valley), all showed a DECREASE of 16% or more. The net decrease for CBCs that have reported numbers so far is 26%.
It will be interesting to see if the big CBCs yet to report bear out this trend.
> Here in the Portland area, I am finding Bewick's Wrens in roughly normal> numbers. Golden-crowned Sparrows seem to be markedly reduced in number. I > covered a 3.2 mile stretch of the Springwater Trail and found ONE > Golden-crowned and ONE White-crowned Sparrow vs. 22 Song Sparrows and six > Bewick's Wrens, in habitat that typically harbors lots of Zonos and > Juncos. Juncos also seem down somewhat. I think the hot, dry summer and > early fall weather wreaked havoc on the weed seed crop these birds depend > upon. Even the blackberry crop was affected, with blackened, shriveled > fruits on the vines by mid September. Robins, however, are abundant - we > haven't had a strong freeze yet and the grass is still green. Overall, we > haven't had winter yet. Yesterday, I saw a rosebush with several fresh > blossoms. > Jeff Hayes > > Portland