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SPECIES INTERACTIONS
Community Interactions
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Competition – occurs when organisms of the same
or different species attempt to use an ecological
resource in the same place at the same time.
 Resources:
water, food, light, space.
Community Interactions
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Predation – when an organism feeds on another
organism (predator  prey)
Symbiosis – Any relationship in which two species
live closely.
 Mutualism
 Commensalism
 Parasitism
Mutualism (++)
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When both species benefit from the relationship
Example: Many flowers depend on insects to
pollinate them. Bugs help flowers reproduce and
flowers provide bugs with nectar, pollen, etc.
Commensalism (+0)

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One member benefits and the other is
neither helped nor harmed.
Example: barnacles attach to a whale’s
skin. Barnacles are able to filter feed from
water rushing past them but they do
nothing, good or bad, for the whale.
Parasitism (+-)
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One organism lives on or in another organism and
harms it.
Examples: fleas, ticks, tapeworms, zombie snails….
Zombie Snail Video
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http://www.youtube.com/watch?v=EWB_COSUXM
w&safety_mode=true&persist_safety_mode=1