20.1: species interactions (part iii)
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20.1: SPECIES INTERACTIONS (PART III)
3. Symbiosis- close ecological relationship between two or more organisms of different species that live in direct contact
A. MUTUALISM
Mutualism: ( +/+) both benefit EX. Clown fish get shelter and
anemone gets free cleaning. http://www.pbslearningmedia.org/asset/nat08_vid_travcom/
B. COMMENSALISM
Commensalism: (+/0) one benefits and one neutral
EX. Barnacles on Grey Whale
C. PARASITISMParasitism: +/- (but not killed)
EX. intestinal worms / humans 1. parasite: small and lives on or in the host organism
C. PARASITISMParasitism: +/- (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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