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What do you know about frogs?

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.

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What do you know about frogs?

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

  2. 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.

  3. Missing back left leg Northern Leopard Frog (Rana pipiens) All pictures taken from MPCA in Minnesota during the summer of 1996

  4. Missing back right leg

  5. Extra foot growing out of back left leg

  6. Extra back right leg

  7. Deformed back left leg

  8. Tadpole tail that never absorbed

  9. Deformed back left leg

  10. One-eyed frog

  11. Extra left leg

  12. Extra and deformed left leg

  13. Deformed left leg

  14. Missing left leg

  15. Deformed tail

  16. Tail not absorbed

  17. Extra legs

  18. What is causing these deformities?

  19. 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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