[TN-Bird] Re: Odd Blue-winged Warbler song

From: "Boves, Than James" <tboves@xxxxxxx>
To: <bb551@xxxxxxxxxxxxx>, Tennessee Birds <tn-bird@xxxxxxxxxxxxx>
Date: Wed, 15 Jun 2011 18:19:47 -0400
About 10% of phenotypically normal GWWA and BWWA are "cryptic" hybrids, meaning 
they show no noticeable hybrid plumage but do show evidence of introgression 
when genetic tests are performed. Therefore, this individual you recorded could 
have been a cryptic hybrid. I don't think anyone has investigated the songs of 
the cryptic hybrids - would be interesting to examine that aspect! I don't 
think I can attach the paper here, but if anyone is interested, let me know and 
I can send it to you.      

Than Boves
Knoxville, TN


-----Original Message-----
From: tn-bird-bounce@xxxxxxxxxxxxx on behalf of Bill Pulliam
Sent: Wed 6/15/2011 4:54 PM
To: Tennessee Birds
Subject: [TN-Bird] Odd Blue-winged Warbler song
 
I finally got around to posting the recordings I made of the aberrant  
Blue-winged Warbler song I recorded last week (6/9/11) right on the  
Lewis/Hickman County line.  As I mentioned before, I saw the bird and  
it looked like a normal Blue-wing, not a hybrid.  I posted a video  
recording, even though most of the video track is useless (blurry  
wiggly trees with no bird).  I did append two sonograms of sample  
songs at the end; you can pause for a longer look at them:

http://s368.photobucket.com/albums/oo125/wmpulliam/? 
action=view&current=Bluewing.mp4

This is not an alternate "B" song.  It is an unusual primary "A"  
song.  I transcribed it as "seeeee-biz-biz."  To my ear it sounded  
like a normal Blue-wing introductory note, but followed by two short  
Golden-wing like notes rather than the usual slow "raspberry" trill.   
There are many good examples on the tape I posted; the loudest and  
clearest ones are near the end.  The sonograms more or less agree  
with my audio impression, with a few details differing.  The  
introductory note is a typical Blue-wing "seeee".  The subsequent  
notes are spectrographically  more like the first note (but higher  
pitched) than they are like the typical Golden-wing song, but the  
difference is subtle.  What is the oddest to me is the extremely  
"hard" abrupt beginning of these notes; it almost looks like they  
were artificially constructed with a "cut" in the tape at that  
point.  This is also characteristic of the terminal notes of a Golden- 
wing song, but especially at the END of the note, not the beginning.

Evidently, a Vermivora does not have to have mixed parentage to come  
up with his own unique mixed-up song!

Bill Pulliam
Hohenwald TN
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References:
- [TN-Bird] Odd Blue-winged Warbler song
  - From: Bill Pulliam
[TN-Bird] Re: Odd Blue-winged Warbler song

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