2.  Anchor: BIO.B.4.2 Describe interactions & relationships in an ecosystem ◦ BIO.4.2.2: Describe biotic interactions in an ecosystem

3.  Organisms interact with each other when share same habitat or niche  Types of interactions: ◦ Competition ◦ Predator/prey ◦ Symbiosis: two organisms in close, constant contact  Commensalism  Mutualism  Parasitism

4.  Community Interactions ◦ Competition: organisms attempt to use a resource at the same time in the same place  Resource could be mate, food, territory, etc.

5.  Predation: one organism (predator) captures and kills another organism (prey) ◦ Ex: lion hunts and kills wildebeest http://dsc.discovery.com/tv-shows/life/videos/komodo- dragons-hunt-buffalo.htm

6.  Symbiosis: relationship in which two species live closely together ◦ Mutualism: both species benefit from the relationship  Ex: Flowers depend on bees to pollinate them  Flowers  reproduce  Bees  get food

7.  Symbiosis ◦ Mutualism:  Ex: Birds on back of buffalo  Birds  food  Buffalo  get cleaned/protection from parasites

8.  Symbiosis ◦ Commensalism: one species benefits; one is unaffected  Ex: Barnacles attaching to whale  Barnacle  filters water to get food  Whale  unaffected

9.  Symbiosis ◦ Commensalism:  Ex: Orchids growing up trees in Rain Forest  Orchids  more sunlight  Tree  unaffected

10.  Symbiosis ◦ Parasitism: one species (parasite) feeds on but doesn’t kill another (host)  Ex: tick (parasite) on a deer (host)  Ex: tapeworms (parasite) in animals intestines (host)