1. Objective: Students will know that an ecosystem includes both biotic and abiotic factors AND that changing one factor in an ecosystem can affect many other factors.

2. 13.2 Biotic and Abiotic Factors
Set up Cornell Notes on pg. 89
Topic: 13.2 Biotic and Abiotic Factors
Essential Question(s):
What role might an abiotic factor such as temperature play in the evolution of a species?
13.2 Biotic and Abiotic Factors
2.1 Atoms, Ions, and Molecules
KEY CONCEPT Every ecosystem includes both living (biotic) and nonliving (abiotic) factors.

3. KEY CONCEPT Every ecosystem includes both living (biotic) and nonliving (abiotic) factors.

4. Biotic factors are living things.
plants
animals
fungi
bacteria
plants

5. Abiotic factors are nonliving things.
moisture
temperature
wind
sunlight
soil
moisture
sunlight

6. Every ecosystem contains biotic and abiotic factors
List the biotic and abiotic factors in this picture
Share with your neighbors

7. Biotic and Abiotic Factors (2m40s)

8. Levels of Organization
Please look at your L.O.O. poster
Please go back and label ALL of your living and non-living parts with either biotic or abiotic
Pine trees: biotic
Bird: biotic
Water: abiotic
Reindeer: biotic
Rabbit: biotic
Bear: biotic
Reindeer: biotic
Soil: abiotic

9. Abiotic Factors and Plant Growth (Top 2/3 Pg 88)
Problem: How do abiotic factors affect plant growth
Procedure:
Choose an abiotic factor to test on the growth of radish seedlings. Possible factors include: amount of sunlight, amount of water, soil type, or amount of fertilizer…etc
Determine a way to vary the factor you have chosen. Be sure to include at least three different settings of your variable and to keep all other factors constant. Write about a procedure for your investigation.
Hypothesize what you think your experimental results might be. Draw a picture to illustrate your possible findings.

10. Biodiversity is the assortment, or variety, of living things in an ecosystem.
Rain forests have more biodiversity than other locations in the world, but are threatened by human activities. (50% of the world’s plant and animals species are here)

11. Number of species NOT Population number
Biodiversity has to do with:
Number of species NOT Population number

12. Extinctions lower biodiversity!!!

13. Biodiversity: “The Wild Classroom” (6m11s)

14. Bill Nye: Biodiversity (22 mins)

15. A keystone species is a species that has an unusually large effect on its ecosystem. Ex: A beaver
Their removal from the ecosystem may cause a ripple effect felt across an entire ecosystem
keystone
Arch collapses without it

16. Sea Stars
Eat sea urchins/ mussels/ shell fish which have no other predators
What will happen if star fish disappear?
The mussel population will “explode”
This explosion will drive out other species

17. Sea Otters
Sea otters protect the kelp forest from the destruction of sea urchins
Sea otters eat sea urchins
What will happen if sea otters disappear?
Urchins will sever kelp forests at the base destroying them

18. Keystone Species (3m58s)

19. Keystone Species: Prairie Dog

20. REVIEW Pg. 88 (Bottom 1/3 of pg. 88)
1. How would the removal of a keystone species affect an ecosystem’s biodiversity?
2. Analyze: Humans are sometimes described as being a keystone species. Does this label fit? Why or why not?

21. REVIEW
1. How would the removal of a keystone species affect an ecosystem’s biodiversity?
The removal of a keystone species would decrease the ecosystem’s biodiversity.
2. Analyze: Humans are sometimes described as being a keystone species. Does this label fit? Why or why not?
Keystone species are those that help to establish and maintain a complex web of life. Humans do not fit this label because human activities often decrease, rather than increase, biodiversity.