1. Interactions in Communities ES Holt Ch. 8.2

2. Community  All populations interacting in a particular ecosystem

3. Predation  One organism (predator) killing another (prey) for food

4. Coevolution  Two species develop adaptations in response to one another Disea nivea Orchid and fly  Two species develop adaptations in response to one another Disea nivea Orchid and fly

5. Symbiosis  The relationship in which two different species live in close association with each other.  Symbiotic relationship  Three types:  The relationship in which two different species live in close association with each other.  Symbiotic relationship  Three types:

6. Parasitism  One organism (Parasite) feeds on another organism (host) Braconid wasp cocoons on tomato hornworm  One organism (Parasite) feeds on another organism (host) Braconid wasp cocoons on tomato hornworm Body Invaders

7. Mutualism  Relationship between two or more species in which both species benefit ant, butterfly caterpillar, and acacia Ant and Caterpillar

8. Commensalism  A relationship between two species in which one benefits and the other is not harmed or helped Barnacle and whale  A relationship between two species in which one benefits and the other is not harmed or helped Barnacle and whale whaleshark and remora