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Transcript 
Symbiotic Relationships
Species interactions
What is symbiosis?
• Long term partnership between
members of different species
Types of symbiosis
• Parasitism
• Mutualism
• Commensalism
• Why not predation?
• Why not competition between
two organisms of the same
species?
Parasitism
• 1 species benefits, 1 is harmed
• +1, -1
Blood Suckers
Lampreys
Mistletoe
Tapeworm
Mutualism
• Both species benefit
• +1, +1
Cleaner fish
Insects and Flowers
Aphids and Ants
Birds and
Livestock
Lichens
Commensalism
• One species benefits, the other
is unaffected
• +1, 0
Barnacles and Whales
Hitch Hiking
Nesting in Trees
Conclusion
• What is symbiosis?
• What are the 3 types of
symbiotic relationships?
• What is Parasitism?
• What is Mutualism?
• What is Commensalism?
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