Posted by mary on Sunday, September 9, 2007 at 8:10pm.
Since this is not my area of expertise, I searched Google under the key words "frog health ecosystems" to get these possible sources:
http://www.news.uiuc.edu/NEWS/04/0210frogs.html
http://findarticles.com/p/articles/mi_m1590/is_1_59/ai_95845326
http://members.aol.com/hyla/
http://www.watercare.net/wll_cc/cw_inland_water_copy1.htm
http://www.open.ac.uk/daptf/froglog/froglog-30-4.html
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
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