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Parasites Affecting Frog Population The number of healthy frogs in North America is rapidly decreasing due to a small parasite that results in the deformation of the frog population. University of Wisconsin graduate Pieter Johnson is studying the possible threat the parasite poses. Due to the increasing rate of production, man-made ponds are starting to outnumber natural wetlands and are forcing frogs to adapt to these inferior habitats. Ironically, it's lakes like these that the …

…the procedure again. Although, that's not Johnson's interest. It is the worms connection to the snail that has him so intrigued. Without the snails the worm cannot survive and these snails seem to live in ponds with lots of runoff and organic matter. Johnson also found that humans interacted with 91% of parasite-infested ponds. Artificial wetlands have been becoming more and more popular since 1930 and have covered as much as 1.2 million hectares in the U.S.