Hector, I think that papers of Henry Fitch about taxocenosis of snakes (over 40 years of studies) from Kansas could helps you.

Best regards.

This paper by Chris Reading and colleagues might be of use:

http://rsbl.royalsocietypublishing.org/content/early/2010/06/03/rsbl.2010.0373

Cheers,

Angelo 

http://rsbl.royalsocietypublishing.org/content/early/2010/06/03/rsbl.2010.0373

While I don't know of any papers on this topic, I would certainly look at the papers of Professor Rick Shine, Sydney University. He is an outstanding researcher in herpetology (among Australia's best) and he is likely to have touched on the topic.

Regards, Shelley

Dear hector 

I had done a short study about effect of cyclone phailin on pediatric age groups in my hospital. The cyclone did hit my area with maximum devastation. In my study the increase in snakebite was  insignificant with comparison to the control. So my impression is the environmental hazards don't alter the incidence of snake envenomation. 

Regards 

Dr.mishra