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The Fading Chorus

Over the past 50 years scientists have recorded major declines in frog populations around the world. A few species have vanished completely. Many frog die-offs are the result of local human activity, but the epidemic has also reached remote areas. Is there a global cause? Scientists continue to search for answers.

American toad with throat pouch inflated
Bufo americanus
© James Harding, MSU

Major causes of frog declines:

Frogs with extra or missing legs, eyes, and toes have been found in 44 states since 1996. Possible causes include parasites, pollution, and ultraviolet radiation.

In a laboratory study in 1997, nearly half of the frog eggs exposed to ultraviolet light grew into malformed adults, while eggs with no exposure developed into normal adults.

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