1. Do now activity What is the difference between abiotic and biotic?
Give 5 examples of abiotic factors that can be found in the ocean.
Give 5 examples of biotic factors that can be found in the desert.
What is the niche of decomposers in a food chain?

2. Section 8-1: niche & symbiosis
Essential Question:
Why is one organism’s niche important to the entire community?
Learning Target
Determine the importance of an organism’s niches in maintaining the stability of a community.
Evaluate the group behavior of organisms and how these behaviors impact their chance of survival as individuals and species’.
Section 8-1: niche & symbiosis

3. Check the class calendar!
announcements
Check the class calendar!

4. announcements Available Extra Credit:
Tissue Box = 10 Points CP
Rulers/Colored Pencils = 10 Points CP
Plastic Pencil Boxes = 30 Points CP

5. Don’t forget to chunk your notes!

6. Biotic: living things in an ecosystem that can influence an organism
Example: Plankton
Algae (what Plankton eats)
Shrimp (what eats Plankton)
Other fish that live in the same ecosystem
overview

7. Abiotic: non-living factors of an environment
overview
Abiotic: non-living factors of an environment
Example: Plankton
Water
Sand
Rocks
Climate

8. overview
Habitat (ecosystem): an area where an organism lives that includes both abiotic and biotic factors.

9. Don’t forget to chunk your notes!

10. A niche is a role or job of an organism in the ecosystem.
Examples
What the organism eats
What eats the organism
How the organism reproduces
The abiotic factors the organism needs
niche

11. Competition happens when niches overlap

12. niche
Competition Exclusion Principle: no two species can occupy the same niche in the same habitat at the same time.

13. Don’t forget to chunk your notes!

14. When 2 different species live closely together
symbiosis
When 2 different species live closely together

15. There are 3 types of symbiosis interactions

16. Mutualism: both species benefit from the relationship
symbiosis
Mutualism: both species benefit from the relationship

17. symbiosis
Commensalism: One species benefits the other is neither helped or harmed.

18. symbiosis
Parasitism: One species gets all or most of its nutrients from another species.

19. Ectoparasites – live on the outside
symbiosis
Ectoparasites – live on the outside

20. Endoparasites – live on the inside
symbiosis
Endoparasites – live on the inside

21. Don’t forget to chunk your notes!

22. Human interference Altering habitats
Human activities that reduce biodiversity:
Altering habitats
Introducing foreign species into established food webs
Polluting ecosystems
Hunting species to extinction
habitats altered for housing, agriculture, or industry
habitat fragmentation: splitting a habitat into small fragments
the smaller the habitat fragment, the fewer the number of species
Biomagnification
Endangered Species
Bioaccumulation
Invasive Species
Habitat Fragmentation
Extinction-1681

23. Human interference
DECREASES
Conservation: management and preservation of natural resources.

24. Don’t forget to chunk your notes!

25. Section 9-1: niche & symbiosis
Essential Question:
Why is one organism’s niche important to the entire community?
Learning Target
Determine the importance of an organism’s niches in maintaining the stability of a community.
Evaluate the group behavior of organisms and how these behaviors impact their chance of survival as individuals and species’.
Section 9-1: niche & symbiosis

26. Do now activity
Choose a symbiotic relationship and explain how it is a positive/negative relationship?
Explain how an organism’s niche relates to its trophic level (placement in the food chain).
What is the difference between biotic and abiotic?
What is the Competition Exclusion Principle?