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Interesting hypothesis.
"Ours" remained relatively uncommon till 2000 or so. When I came home on
leave for a month in the summer in the '90's, a sighting was still
noteworthy, but sightings were becoming gradually more frequent. By the
winter of 2003-04, my first real winter home, they were pretty regular at
certain favorite locations.
Winters have been warming gradually over the past couple or three decades.
I'm not sure if the more rapid increase a decade-odd ago had anything to do
with winter temperatures or if it was just part of the exponential phase of
a sigmoid curve. Missed opportunity for an interesting graduate thesis, eh?
-----Original Message-----
From: naturens-owner@chebucto.ns.ca [mailto:naturens-owner@chebucto.ns.ca]
On Behalf Of Fred Schueler
Sent: March-30-13 11:57 AM
To: naturens@chebucto.ns.ca
Subject: Re: [NatureNS] Turkey Vultures
Quoting nancy dowd <nancypdowd@gmail.com>:
> In Bernd Heinrich's newer book (Life Everlasting: The Animal Way of
> Death) the author suggests Turkey Vultures have steadily expanded
> their range northwards because carcasses are no longer frozen
> completely solid during the milder winters in New England allowing a
> large population to remain year round.
* that may work for New England, but it seems to me that there's also very
increased seasonal and breeding migration into Ontario -
http://karstaddailypaintings.blogspot.ca/2012/04/jills-barn-5-x-7-in.html -
but this would have to be measured north of Bernd's "frozen carcass"
isotherm.
fred.
------------------------------------------------------------
Frederick W. Schueler & Aleta Karstad
Bishops Mills Natural History Centre - http://pinicola.ca/bmnhc.htm
Mudpuppy Night in Oxford Mills - http://pinicola.ca/mudpup1.htm
Daily Paintings - http://karstaddailypaintings.blogspot.com/
South Nation Basin Art & Science Book
http://pinicola.ca/books/SNR_book.htm
RR#2 Bishops Mills, Ontario, Canada K0G 1T0
on the Smiths Falls Limestone Plain 44* 52'N 75* 42'W
(613)258-3107 <bckcdb at istar.ca> http://pinicola.ca/
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