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Re: love in the air



Shantanu - 

I would bet that singing cycles are based on
photoperiod - daily light period length. It's
a much more common and dependable cue than
temperature. Unfortunately I have little direct
information substantiating my claim.


Best,
Jason Sircely


On Wed, 14 Feb 2001, shantanu phukan wrote:

> Date: Wed, 14 Feb 2001 16:20:28 -0500
> From: shantanu phukan <phukan@email.unc.edu>
> To: carolinabirds@duke.edu
> Subject: love in the air
> 
> And speaking of love in the air, just four days ago (February 11) I
> heard my first Pine Warbler of the year singing from a Loblolly Pine.
> I wonder if the last three days hushed it up again. Does anyone know
> if birds will be fooled by warm spells and start singing unseasonally
> early, or if their internal clock makes them difficult to fool?
> 
> Shantanu Phukan
> 
> 

_______________________________________
                                                     
     Jason A. Sircely                         
     Department of Biology               
     Box 90338                                
     Duke University                         
     Durham, North Carolina 27708   
     Tel: 919-684-2267                           
                                               
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