anneboby ([email protected])To:you (Bcc) + 1 more Details Slideshow
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!important;border-radius: 2px;}Larry - as you correctly point out,
brown-plumaged Purple Finches can be females or imm. males. A brown bird is
not automatically a female even though field guides give that impression. The
imm. males don't acquire rosy adult male plumage until their molt in Jul-Sep of
the year after they hatched.
Certain species of passerines show sexual variation in the extent of their
migration; males remaining farther north than females to be closer to their
breeding area come spring to claim their territories. I'm not certain if
Purple Finches do this, but from year-round banding work that I've done at at
my Adirondack camp at Jenny Lake near Corinth in Saratoga Co, adult male
finches outnumber and outlive females.
In a 47-yr study conducted 1970-2016 at JL I banded 13,256 Purple Finches
primarily during the breeding season and recaptured 3,240 of them in subsequent
years. Imm. brown birds were 6,017 of the total 13,256. Among birds banded
as adults, males outnumbered females 51.9% to 48.1%; and among the 3,240 return
recaptures of those adult birds, males outnumbered females 61.5% to 38.5%.
Among the 6,017 banded brown imm., which were later recaptured as adults when
their sex could be determined, males outnumbered females 58.9% to 41.1%.
The oldest recaptures by sex were two males at 11yr-01mo and a female at
10yr-0mo. Repeatedly, year after year, return captures 5 yrs old or more were
predominantly male, 65.7% male to 34.3% female. The No. Am. age record is a
male at 12yr-08mo in NC.
I banded another 3007 Purple Finches in my yard in Schenectady, 1964-2008,
primarily as winter visitors. The three largest invasions were 303 banded in
1965, 808 in 1975 and 1323 in 1977. Apr was the month of greatest abundance as
migrants poured north: 1260 banded out of the 3007 total banded.
Sadly, Purple Finches no longer appear in my yard, and they have declined 52%
as breeders at Jenny Lake (elev. 1236 ft.) as a result of climate change, the
local Adirondack forest no longer cool enough to their liking.
Enjoy your visitors,
Bob YunickSchenectady and Jenny Lake
-----Original Message-----
From: Larry Trachtenberg <[email protected]>
To: [email protected] <[email protected]>
Sent: Tue, Oct 20, 2020 10:24 pm
Subject: [nysbirds-l] question Purple F
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