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20.1: Species Interactions (Part III)
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3. Symbiosis- close ecological relationship between two or more organisms of different species that live in direct contact
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MUTUALISM Mutualism: ( +/+) both benefit EX. Clown fish get shelter and anemone gets free cleaning. asset/nat08_vid_travcom/
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B. COMMENSALISM Commensalism: (+/0) one benefits and one neutral EX. Barnacles on Grey Whale
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Parasitism: +/- (but not killed)
C. PARASITISM Parasitism: +/- (but not killed) EX. intestinal worms / humans 1. parasite: small and lives on or in the host organism
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C. PARASITISM Parasitism: +/- (but not killed)
EX. intestinal worms / humans 1. parasite: small and lives on or in the host organism 2. weaken the host 3. evolutionary adaptation kept the host healthy enough to allow parasite reproduction
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