1. February 4, 2010
WITHOUT LOOKING AT NOTES, put these in order from smallest to largest:
community, organism, biosphere,
ecosystem, population, biome
What is the difference between and ecosystem and a biome?

2. Competition: more than one organism uses one resource at the same time
Q: Let’s turn our focus to communities. What are some interactions within communities?
Competition: more than one organism uses one resource at the same time
Food
Reproduction (competition within population)
Shelter
Water

4. Predation: one organism eats another. Praying Mantis Komodo Dragon
Q: Let’s turn our focus to communities. What are some interactions within communities?
Predation: one organism eats another.
Praying Mantis
Komodo Dragon

5. Q: Let’s turn our focus to communities
Q: Let’s turn our focus to communities. What are some interactions within communities?
Symbiotic relationships: close relationship between two or more species
EXAMPLES OF TYPE 1:
Aphids & Ants
Water Buffalo & Birds
Mutualism: both species benefit from relationship

6. Symbiosis- Mutualism
Ex. Lichen (fungi gives habitat to algae & algae gives food to fungi)

7. Symbiosis- Mutualism
Ex. Pea Plants (nodules on roots have bacteria to make nitrates, plants use nitrates to grow and bacteria get nutrients/shelter)

8. Symbiosis- Commensalism
EXAMPLE OF TYPE 2:
Crocodile & Fish
Commensalism: one organism benefits, one doesn’t care either way

9. Symbiosis- Commensalism
Ex. Barnacles (grow on marine organisms, barnacles get shelter, organism doesn’t care)

10. Symbiosis- Commensalism
Ex. Shark and Pilot Fish (fish get protection, shark doesn’t care)

11. Symbiosis- Parasitism
EXAMPLE OF TYPE 3:
Wasps & Aphids
Cat Parasite
Parasitism: one organism benefits, one is harmed

12. Symbiosis- Parasitism
Ex. Mistletoe (grows on trees and steals water from trees)

13. Symbiosis- Parasitism
Ex. Strangler Fig (grows on trees, strangles it so it cannot survive)

14. Q: Let’s turn our focus to ecosystems
Q: Let’s turn our focus to ecosystems. What are some interactions of ecosystems?
Habitat: where organisms live
Niche: an organism’s role in the ecosystem (shelter, food, reproduction)

15. Q: How does energy flow in an ecosystem?
It always starts with the SUN. (most energy available)

16. Q: How does energy flow in an ecosystem?
Autotroph: makes their own food using sunlight (PLANTS) or chemicals (some bacteria), also called PRODUCERS
“Auto” = self
“troph” = feed

17. Q: How does energy flow in an ecosystem?
Heterotroph: eats other stuff
“hetero” = different/other
“troph” = feed
Can be called consumers

18. Q: How does energy flow in an ecosystem?
Herbivores: eat only plants
Carnivores: eat other heterotrophs (animals)
Omnivores: eat plants and animals
Detritivores: eat dead matter and return nutrients to soil
Decomposers: secrete chemical to break down matter and absorb nutrients, return nutrients to soil