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Anchor: BIO.B.4.2 Describe interactions & relationships in an ecosystem ◦ BIO.4.2.2: Describe biotic interactions in an ecosystem 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 Community Interactions ◦ Competition: organisms attempt to use a resource at the same time in the same place Resource could be mate, food, territory, etc. Predation: one organism (predator) captures and kills another organism (prey) ◦ Ex: lion hunts and kills wildebeest http://dsc.discovery.com/tv-shows/life/videos/komododragons-hunt-buffalo.htm 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 Symbiosis ◦ Mutualism: Ex: Birds on back of buffalo Birds food Buffalo get cleaned/protection from parasites Symbiosis ◦ Commensalism: one species benefits; one is unaffected Ex: Barnacles attaching to whale Barnacle filters water to get food Whale unaffected Symbiosis ◦ Commensalism: Ex: Orchids growing up trees in Rain Forest Orchids more sunlight Tree unaffected 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)