[Odonata-l] color change in female E. geminatum

[Thomas Schultz]

Dear All,

I tried to send this message before but it didn't come back to me so  
I concluded that it didn't go through.  I apologize if this is  
redundant.

Has anyone else noticed that females of Enallagma geminatum change  
their color during copulation?  I am aware of "voluntary" color  
change in male Argia apicalis, but not in any female Enallagma.

In the three photos, the top two are of the same tandem before and  
during copulation.  The lower photo is of a different tandem after  
copulation.  I have also seen many ovipositing females that have lost  
their andromorphic coloration.


Tom





Tom D. Schultz, Ph.D.
Professor of Biology
Denison University
Granville, OH 43023
740-587-6218
schultz at denison.edu

"It’s the sides of the mountain that sustain life, not the top.   
Here’s where things grow." - R. Pirsig


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