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Symbiotic Relationships
Table of Contents
Date
Title
2/25/13
Symbiotic Relationships
Page
Goal: Students will identify and
explain the three types of
symbiotic relationships that exist in
nature.
Predator? Prey?
• Predator- The organism that does the killing in
a predation interaction
• Prey- An organism that is killed and eaten by
another organism in a predation interaction
Predator? Prey?
Predator? Prey?
Symbiosis
• Symbiosis-any relationship in which two
species live closely together and at least one
of the species benefits.
– There are 3 main types of symbiosis
• Mutualism
• Commensalism
• Parasitism
Mutualism (+,+)
• Mutualism (+,+) is a
relationship where both
species benefit.
ex. An oxpecker rides
and snacks aboard an
impala. The oxpecker eat
ticks living on the impala’s
ears. This interaction is an
example of mutualism
because both organisms
benefit.
Commensalism (+,0)
• Commensalism- a
relationship in which
one species benefits ant
the other species is
neither helped nor
harmed
– This is not very common
in nature because two
species are usually
helped or harmed a little
by any interaction
Parasitism (+, -)
• Parasitism (+,-) A
relationship that
involves one organism
living with, on, or inside
another organism and
harming it.
– Ex. Fleas and ticks on a
dog
Parasitism
• Parasite- The organism
that benefits from
parasitism
– Usually smaller than the
host
– The parasite does not
usually kill the organism
it feeds on. If the host
dies, the parasite could
lose its source of food or
shelter
• Host- The organism that
the parasite lives on or
in
Apply It! Classify each interaction as mutualism,
commensalism, or parasitism.
• Interaction 1: A remora fish attaches itself to
the underside of a shark without harming the
shark, and eats leftover bits of food from the
shark’s meals.
• Interaction 2: A vampire bat drinks the blood
of horses.
• Interaction 3: A bee pollinates a flower.
Identify the type of symbiosis:
• http://www.bbc.co.uk/
nature/adaptations/Sy
mbiosis#p00n06sr
http://youtu.be/90exkFR2
iSM
Got it?
• I get it! I know now that the three types of
symbiosis differ in the following ways:
• I need extra help with _________________.