Date: 1/29/18 5:51 pm From: Grant Stevenson <pahawkowl...> Subject: window collisions as evidence of sprawl (habitat destruction); climate change resources
I want to thank the woman who was so concerned about birds that when birds are around, she closes her windows/glass doors.
Drawing the shades is particularly effective for preventing bird window-collisions, according to one biologist who has been investigating window-kill for a long time.
Stickers do not work as birds collide with glass partitions in between them. Markers do not work, either. Developing, is a possible solution in the future. A glass with a u-v level seen by birds, but not by humans.
This needs our support, as window-collision may be the second most frequent human-caused bird mortality factor, as real estate sale simply increases the problem.
I've seen Eastern Phoebes in winter. At forty degrees latitude, they have the metabolism to be around this point, but for some reason, not at the forty degrees latitude, even if nest or winter roost boxes are put out there.
Wood Ducks, Olive-sided Flycatchers, American Robins, Red-bellied Woodpeckers, Baltimore Orioles, Red-breasted Nuthatches, and more may have different distributions, possibly because of climate change.
This phenomenon we are witnessing
There was one case of a Ovenbird being recaptured throughout the winter at the Powdermill Nature Preserve of the Carnegie Mus. of Nat. History.
Here is a partial list of of two-three papers and a couple of books on bird biology, ecology, and climate change:
both on Amazon. also, check out alibris.com, harvestbooks.com, ButeoBooks.com, and AbeBooks.com.
http://onlinelibrary.wiley.com/doi/10.2307/1940431/full This paper demonstrates that birders may be surprised at what they get if they have a mist net in winter. Crows and cardinals are the most adaptive passerines in winter, surviving temperatures down to 14 degrees F. Then, they move more south, called "partial migration".
I get the impression that so far kestrel numbers are up slightly, where red-tail numbers are slightly down. Anyone: what do you seen and think?
Oklahoma published little while ago a winter atlas to compliment their breeding atlas .Is there any reason to do this in PA? Winter birding is more simple than that of summer due to a smaller number of species, easily
seen without tree and scrub leaves. More with less experience, perhaps from the cities, can participate. Some birds obviously stay north in winter, coupled with the birds migrating down here. This coupling is called a "metapopulation".
Pennsylvania has the most roads of any other state, thus is the most fragmented. Habitat still extant in a matrix of lots, of wetlands, fields, cropland, etc. This situation has arisen in PA as a result of lack of multi-municipal planning, esp. that to manage wildlife remaining.
Was the Gyr seen today (Mon. 29th)? Did you document copiously as well as take photos and videos? Without it, at least PORC may not accept the record: probably NJBRC may not as well. Right?
There were about 150-200 mobbing humans there, but I counted NO ONE taking notes but me.
Sorry about the long length of this post.
In birds and birding,
Grant Stevenson Fountain Hill, Lehigh County <pahawkowl...>