2. Review: Levels of organization ORGANISM POPULATION COMMUNITY ECOSYSTEM BIOME BIOSPHERE

4. Community Interactions Community: Many species interacting in the same environment Three types of interactions: – Competition – Predation – Symbiosis

5. Competition: struggle between individuals for limited resources (water, nutrients, light, food, mates).

6. Competitive exclusion: no two species can occupy the same niche in the same habitat at the same time What’s going to happen?

7. Predation Defined: when an organism captures and feeds on another organism. Predator- hunter Prey- hunted

8. Symbiosis- Long term relationship between species living closely together. Three types: Mutualism Commensalism Parasitism

9. Mutualism Mutualism: both species benefit from a relationship. Ex: Lichens (fungus and Algae) Ex: Clown fish and anemones Ex: Cleaner birds and crocodiles

10. Commensalism Commensalism – One member of a symbiotic relationship benefits and the other is neither helped or harmed Ex: Cattle and Birds – Birds eat insects stirred up by the cattle Ex: Barnacles and whales – Barnacles grow on whale

11. Parasitism Parasitism- One creature benefits and one creature is harmed Ex: Tapeworm feeds in a humans intestines absorbing his/her nutrients

12. Review 1)What is a community? 2)Name the 3 types of community interactions. 3)When do organisms usually compete? 4)How do predators and prey interact? 5)Name the 3 types of symbiosis. 6)How does mutualism, commensalism, and parasitism differ?