What do you know about frogs?

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What do you know about frogs? N. Leopard frog Spring Peeper Gray Frog Wood Frog

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What do you know about frogs?. N. Leopard frog. Spring Peeper. Wood Frog. Gray Frog. History. Since 1992, scientists have been finding more and more frogs that are deformed. During the summer of 1995, middle school students at the Minnesota New Country School went on a field trip. - PowerPoint PPT Presentation

Transcript of What do you know about frogs?

Page 1: What do you know about frogs?

What do you know about frogs?

N. Leopard frog Spring Peeper

Gray Frog Wood Frog

Page 2: What do you know about frogs?
Page 3: What do you know about frogs?

History• Since 1992, scientists have been finding more

and more frogs that are deformed. • During the summer of 1995, middle school

students at the Minnesota New Country School went on a field trip.

• As they hiked they saw many frogs hopping about. The students looked closer and noticed that many of the frogs were deformed.

• For some reason the frogs were not developing correctly.

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Missing back left leg

All pictures taken from MPCA in Minnesota during the summer of 1996

Northern Leopard Frog (Rana pipiens)

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Missing back right leg

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Extra foot growing out of back left leg

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Extra back right leg

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Deformed back left leg

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Tadpole tail that never absorbed

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Deformed back left leg

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One-eyed frog

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Extra left leg

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Extra and deformed left leg

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Deformed left leg

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Missing left leg

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Deformed tail

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Tail not absorbed

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Extra legs

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What is causing these deformities?

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Hypotheses

• UV Radiation• Environmental Chemical

– Hormones– Pesticides (weakening of immune system)

• Parasite Hypothesis– A trematode burrows into a tadpole near where the

legs will develop. This parasite gets in the way and causes legs to develop incorrectly.

• Retinoids– class of chemical compounds that are related

chemically to vitamin A.


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