1. Paradigm Shift

2. Observe and Infer

3. The Silence of the Frogs
Goal: to understand how frogs make a good indicator species.

4. Frogs K W L

5. Frogs- A History Been around for 400 million years
Survived global extinction 250 million years ago (most plant/ animal life)
and 64 million years ago (dinosaurs)
Adapted to ice age
Global Warming (periods)
Withstand drought, flood, winter
Found in most ecosystems that have water

6. Frog populations

7. Stop and think!
From our KWL chart, what could be happening to frogs that are causing their populations to crash when they have survived for millions of years.
Video

8. Why are scientists concerned?
Summarize the main points from the video.
Great indicator species because:
Live in two ecosystems (tadpoles/ water) (frog/ forest and grasslands)
Exposed to hazards in both ecosystems
Two different food chains

9. Vocab- match herbivore, carnivore, omnivore producers, consumers

10. Frogs wiped out- What next ?
Tadpole food chain
Frog food chain
How would it effect the rest food chain ?

11. Human Impact Bangladesh Frog populations wiped out for restaurants
Mosquitos increased
Mosquitos carrying malaria increased (blood transmitted disease)
More human infected with and died from malaria

13. Why are frogs disappearing?
Loss of habitat
Habitat ‘cut off’ between ponds and woods (roads)
Tree cutting= exposing to predators
Pollution
Frog skin is thin
Have lungs but also breath through their skin
Pollutants can pass through too
Acidic water – reduces chances of eggs being fertilized
Slows down embryo development, deformed limbs etc

15. Exit slip- Check for Understanding
Explain why the life cycle and skin of a frog make it a good indicator species if you want to determine the health of a local ecosystem.
Construct a concept map that links the decline in the number of frogs to factors that may cause the decline.
Choose one of the possible causes and using your own words, explain how it affects frogs.
Are there any other organisms that would make a good indicator species? Explain.
Frog Declining