1. Community Interactions

2. Community group of different populations living in the same ecosystem. includes all of the living things in an ecosystem.

3. Symbiosis a relationship between two (2) species that live closely together.

4. Mutualism both organisms will benefit (are helped) from the relationship. Examples: - Flowers and pollinators - Oxpecker and hippo - humans and gut bacteria (+, +)

5. Commensalism one organism gets a benefit (is helped) and one organism gets no benefit AND is not harmed (no effect) Examples: -clownfish and anemone -Cattle egret and buffalo -Barnacle and whale -Sharks and remora (+, 0)

6. Parasitism one organism will benefit AND one organism is harmed Parasite lives in or on the host Examples: - Humans and tapeworms - Snails and parasitic worm (+, - )

7. Organism AOrganism B Mutualism Commensalism Parasitism Draw a ‘+’ if the organism benefits. Draw a ‘–’ if the organism is harmed Draw a ‘0’ if the organism does not benefit AND is not harmed + – 0 + + +

8. Predator - Prey Predation: when one organism kills and eats another Predator – kills and eats other organisms Prey – gets eaten by predators http://www.youtube.com/watch?v=0NcJ_63z- mA

9. Predators rely on prey for food and energy. Predators eat the weakest prey members and it makes the prey population stronger overall.

10. When population of prey rises, predator population increases after. When population of prey falls, predator population decreases after.

11. Competition Occurs when two organisms try to use the same resource at the same time and place

12. Interspecific Competition Occurs between members of different species

13. Intraspecific Competition Occurs between members of the same species

14. Niche A niche describes an organism’s way of life and role in an ecosystem. Includes the biological (biotic) and physical (abiotic) conditions needed to live

15. Biotic / Biological conditions Place in food web What it eats how it gets its food when, where, how it reproduces Abiotic / Physical conditions Where it lives Climate it prefers Biome its found in Amount of water it needs

16. Fundamental Niche full range of conditions an organism can live in Realized Niche niche that a species ACTUALLY occupies Smaller than fundamental niche due to competition

17. Competitive Exclusion Principle No two species can occupy the same exact niche in the same habitat. They will compete and one will win (survive) and one will lose (die).