The document provides an agenda and objectives for a biology class. It includes a PowerPoint presentation on biodiversity and environmental change, as well as classroom activities like a jigsaw on biomes. The lesson teaches students about concepts like biodiversity, ecosystem stability, invasive species, and extinction. It emphasizes that ecosystems with higher biodiversity are more stable and resistant to environmental disturbances.

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
different species 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

11. Low or High

12. Low or High

13. Low or High

14. Low or High

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
Grass
Rabbit
Foxes

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

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

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

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

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

22. Example: Low vs. High

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

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

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

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.