20.1: species interactions (symbiosis). symbiosis- close ecological relationship between two or more...
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20.1: SPECIES INTERACTIONS (SYMBIOSIS)
Symbiosis- close ecological relationship between two or more organisms of different species that live in direct contact
1. MUTUALISM ( +/+)
• Both benefit
• EX. Clown fish get shelter and anemone gets free cleaning. http://www.pbslearningmedia.org/asset/nat08_vid_travcom/
2. COMMENSALISM (+/0)
• One benefits and one is neither helped nor harmed
• EX. Barnacles on Grey Whale
3. PARASITISM (+/-)….But not instantly killed
• Parasite: small and lives on or in the host organism
• Usually does not result in immediate death
3. PARASITISM (+/-)….But not instantly killed
• Parasite: small and lives on or in the host organism
• Usually does not result in immediate death
• Weaken the host
• Evolutionary adaptation keep the host healthy enough to allow parasite reproduction
EX. intestinal worms / humans
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