Catalyst: August 28 th , 2014

1. Catalyst: August 28th , 2014 You need your ActivExpression! Prepare for our Carrying Capacity quiz! Have your DBA #2 on your desk!

2. Agenda • Catalyst (10 minutes) • Biodiversity and Change PowerPoint (10 minutes) • Biodiversity Whiteboards(15 minutes) • Homework: HP 9/26

3. Announcements • Biodiversity quiz on Monday

4. Objectives • SWBAT define biodiversity • SWBAT predict the impact of various environmental changes based on the amount of biodiversity in an ecosystem • SWBAT establish a relationship between the amount of biodiversity in an ecosystem and the likelihood of extinction of a species in that ecosystem SWBAT describe invasive species and their impact on an ecosystem’s biodiversity. SWBAT define and describe extinction. SWBAT predict the effects of certain environmental factors on an ecosystem’s biodiversity.

5. Biodiversity and Change

6. Biodiversity is… • Biodiversity is a measure of how many differentspecies live in an ecosystem.

7. High vs. Low Biodiversity • Ecosystems with high biodiversity have many different species of organisms. • Ecosystems with low biodiversity do not have many different species of organisms.

8. High Biodiversity

9. Low Biodiversity

10. Low or High Biodiversity?

11. Low or High Biodiversity?

12. Low or High Biodiversity?

13. Low or High Biodiversity?

14. Low or High Biodiversity?

15. Ecosystem Stability • The higher the biodiversity, the more stable the ecosystem (stable= stays the same) • An ecosystem with high biodiversity does not change easily; it is stable • An ecosystem with low biodiversity is unstable • One small change could cause many species to die

16. Low Biodiversity Rabbits eat grass. Foxes eat rabbits Foxes Rabbit Grass

17. Low Biodiversity • A disturbance hits… A drought happens and kills all the grass. Foxes Rabbit Grass

18. Low Biodiversity • What happens to the foxes? Foxes How many species do we have left? 0! Rabbit BIG change? Grass

19. Higher Biodiversity Let’s add a few more species to our original ecosystem Foxes Lettuce Rabbit Chickens Grass

20. Higher Biodiversity • A disturbance hits… A drought happens and kills all the grass. Foxes Lettuce Rabbit Chickens Grass

21. Higher Biodiversity • The food web started with high biodiversity • High biodiversity = stable ecosystem • One change didn’t have a major impact! • What happens to the foxes? Population size decreases… a little Foxes Lettuce Rabbit BIG change? Chickens Grass

22. Example: Low vs. High

23. Ecosystem 1 Ecosystem 2 CFU 1: Which ecosystem has higher biodiversity?

24. Ecosystem 1 Ecosystem 2 CFU 2: Which ecosystem would be more affected by a disease that killed all the rats?

25. Ecosystem 1 Ecosystem 2 CFU 3: Which ecosystem is more stable? Why?

26. Ecosystem 1 Ecosystem 2 CFU 4: What might happen to the snakes in Ecosystem 2 if there are not any of that species of snakes anywhere else in the world and most of the rats in the ecosystem die from disease?

27. Biodiversity and Extinction • Environmental change in an ecosystem with low biodiversity can even cause extinction of a species • Can occur if there are no organisms of that species in other ecosystems throughout the world • Species with specialized diets (low surrounding biodiversity) and specific habitats are more likely to become extinct than species with diverse diets and a wide range of habitats

28. Invasive Species • Invasive species are non-native species of organisms in an ecosystem that reproduce quickly and have few natural predators • Native= originally from that ecosystem • Non-native= originally from somewhere else • Invasive species decrease biodiversity in an ecosystem by taking over food and space from native species • Decrease the number of native species • Invasive species are very harmful to ecosystems that already have low biodiversity

29. Invasive Species • Examples: • Zebra mussels • Kudzu plant • Brown tree snake • Wild hogs

30. CFU 5 • Brown tree snakes are a species of snakes that were imported to the island of Guam from South America. Brown tree snakes eat many different types of birds and lizards. They reproduce rapidly and have few natural predators. What will most likely happen to the number of native bird and lizard species on Guam over time?

31. CFU 6 • Does an invasive species normally increase or decrease biodiversity in an ecosystem?

32. Zebra Mussel Reading and Questions • Options for reading: • Whole class • Small groups • Partners • Individually

33. Catalyst: August 29th, 2014 • Introduction to ALA ACT method.

34. Agenda • Catalyst: 10 minutes • Biome Jigsaws: 15 minutes • Biome Presentation: 10 minutes

35. Announcements • DABA #3 due 9/8 • LABOR DAY WEEKEND!!!

36. Objectives • SWBAT analyze the features of major global biomes.

37. Biomes Jigsaws • 7 groups • Each group will be assigned a biome reading. • You must identify the following factors for your biomes: • Presentation: After 15 minutes, each group will present major features of their assigned biome. The rest of the class will fill in their graphic organizers accordingly.