[Tweeters] Re: Question About Site Fidelity in Tropical Kingbirds

Jason Hernandez jason.hernandez74 at yahoo.com
Tue Nov 17 22:03:07 PST 2015

As an ecologist, I can see correlations between this and so many other trends. For many years now, the International Palm Society has been documenting increasing winter hardiness in cultivated palms, i.e. palms can survive the winter further north than in the past. And surely we have all seen headlines about strange perturbations in weather patterns or marine food chains. We will recall that last July made the news as the hottest month ever recorded since temperature records began. The only argument left about climate change is not whether it is occurring (clearly it is), but whether or not it is human caused (I believe the preponderance of the evidence is that it is).
Jason Hernandez
jason.hernandez74 at yahoo.com

Date: Mon, 16 Nov 2015 21:33:00 -0800
From: "Jeff Kozma" <jcr_5105 at charter.net>
Subject: RE: [Tweeters] Re: Question About Site Fidelity in Tropical
To: "'Mike Patterson'" <celata at pacifier.com>,    "'Tweeters'"
    <tweeters at u.washington.edu>
Message-ID: <026a01d120f9$6ca17080$45e45180$@charter.net>
Content-Type: text/plain;    charset="utf-8"

To further this thought, migration is hereditary in songbirds, not learned...unlike in geese, cranes and swans where young follow adults on migration paths.  Thus, if a bird survives wintering in an area and returns to its normal breeding grounds and is successful breeding, there is a good chance that migration routes will be passed on genetically to its offspring.  This is believed to be the case with the increasing number of Rufous Hummingbirds now wintering in the southeastern United States instead of making their more traditional fall migrations to Mexico. 

Jeff Kozma

J c r underscore 5105 at charter dot net


-----Original Message-----
From: tweeters-bounces at mailman1.u.washington.edu [mailto:tweeters-bounces at mailman1.u.washington.edu] On Behalf Of Mike Patterson
Sent: Monday, November 16, 2015 7:09 AM
To: Tweeters <tweeters at u.washington.edu>
Subject: [Tweeters] Re: Question About Site Fidelity in Tropical Kingbirds

One might postulate that, if all northward ranging Tropical Kingbirds are doomed to death before reproduction, then the behavior would be non-adaptive and should be either remain rare or eventually extinguish itself.  There is, however, pretty convincing trend data that suggests Tropical Kingbird occurrences in the fall are increasing and that individuals are remaining later.  This would be the opposite of rare or eventually extinguished...

I have seen 6 different Tropical Kingbirds this season on the lower Columbia.  Back in the 90's, they were not even annual in this area.

I explored some of the data last season at:

Mike Patterson
Astoria, OR
The history of photons

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