Environmental Research Foundation . . P.O. Box 5036, Annapolis, MD 21403 . .
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To subscribe, E-mail the words . . Since 1993, scientists worldwide have been trying to understand why frog populations are reported to be steeply declining in relatively unspoiled environments on several continents. In both cases, the first problem has been to determine whether the observed changes represent natural fluctuations, or whether they represent unusual events that might signal something important about declining environmental quality. Many factors have been identified as contributing to declines in frog populations. Frogs raised in water with a pH of 5.5 had significantly more bacteria in their spleens, and a significantly higher death rate, than frogs raised in waters with a pH of 7.0.