Coevolution Power Point

Warm Up Activity
Imagine that you are traveling in
Madagascar when you find the plant to the
left. You see that the plant has an
unusually large spur containing nectar in its
tip. You remember learning in science class
that some moths feed on nectar. Draw a
picture of what you think a moth may look
like that feeds on this plant.
How might natural selection bring about the
evolution of this orchid and the moth?
The Star Orchid
and the
Hawk Moth
 Sometimes
organisms that are closely
connected to one another by ecological
interactions evolve together.
 An evolutionary change in one organism
may also be followed by a corresponding
change in another organism.
 The process by which two species evolve in
response to changes in each other over
time is called coevolution.
 Many
relationships formed through coevolution
are symbiotic relationships.
 Symbiosis: relationship in which two species
live closely together.
 Some types of symbiosis are; predator-prey,
mutuality, parasitic, and commensalism
Predator-Prey Relationships
predator is an organism that eats another
organism. The prey is the organism which the
predator eats.
Example: Lion (predator)
and Zebra (prey)
 The
words “predator” and “prey” are almost
always used to represent animals that eat
other animals. However, the same concept
exists for animals
that eat plants.
Example: mouse(predator)
and berry (prey)
mutuality relationship is when two organisms
of different species "work together," each
benefiting from the relationship.
Example: Cleaner fish
and Nassau Grouper
Plants and the animals that
help them pollinate each other
(called pollinators) have coevolved.
Parasitic Relationships
parasitic relationship is one in which
one organism, the parasite, lives off of
another organism, the host, harming it
and possibly causing death. The parasite
lives on or in the body of the host.
Example: The cat (host) and the flea (parasite).
• A commensalism relationship is an
interaction where one organism benefits
from the interaction and the other is not
Example: Zebra (unaffected)
and cattle egret (benefits)
• Mimicry is a type of commensalism that exists
in nature. One organism evolves to look like
the other in order to benefit itself. The
mimic benefits from the situation while the
organism it mimics in unaffected.
Example: Orchid flowers
that mimic female wasps
Warm Up Activity
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