Date: 6/6/18 10:38 pm From: Joel Geier <joel.geier...> Subject: [obol] Re: Breeding range expansions .... and contractions?
Thanks for your thoughtful contributions to the discussion, as usual
I hadn't thought much about Canyon Wren but now that you mention it ...
I worked moderately hard to find this species in southern Wheeler Co. last week, in canyons where normally it's not hard to find. I can usually call this species in by a whistled imitation (some OFO/OBA field trippers can back me up on that), but I got skunked on this trip. I chalked it up to time of day but I've never run into that problem before, in the same habitat.
On Wed, 2018-06-06 at 20:02 -0700, Wayne Hoffman wrote: > Here are some declining species, not including ones listed as > endangered or threatened. > > > > 1. Common Murre. Total colony failure for years on the north and > central coasts, and declining production on south coast from Bald > Eagle predation and associated egg/chick loss. > > > > 2. Upland Sandpiper. Always rare as a breeder, now apparently > extirpated. > > > 3. Snowy Egret. Seems much less common as a breeder in SE Oregon than > in 1970s. > > > 4. Sage Grouse > > > 5. Yellow-billed Cuckoo > > > 6. Canyon Wren??? A feeling, but without much data. > > > 7. Hermit Warbler > > > Wayne Hoffman > South Beach > > > > > > > On 6/6/2018 5:44:26 PM, Joel Geier <joel.geier...> wrote: > > > > For rapid breeding range expansions into Oregon by species native > > to > > North America, if we measure this in terms of time to go from "rare" > > to > > "ubiquitous," my vote goes to Barred Owl. During the past 20 years, > > this > > species has gone from a "rare" bird that used to produce excited > > reports > > on OBOL, to regular in virtually all Oregon habitats except > > sagebrush > > steppe and alpine. It's now one of the more common road-kill > > species > > along the highway that runs past our house (6 specimens in the past > > 3 > > years). > > > > But what about species going in the other direction? Which native > > bird > > species have gotten noticeably harder to find in that same period? > > I > > have my ideas but I'm interested to hear yours. > > > > > > -- > > Joel Geier > > Camp Adair area north of Corvallis > > > > > > > > POST: Send your post to <obol...> > > JOIN OR QUIT: http://www.freelists.org/list/obol > > OBOL archives: www.freelists.org/archive/obol > > Contact moderator: <obol-moderators...> > > > >