1. Biotic factors 10th grade SOL:BIO. 9a

2. Key Concepts
Coevolution
Predation
Mutualism
Commensalism
Parisitism
Herbivory
Relationships are key…

3. Coevolution
Back-and-forth evolutionary adjustment between two species that interact
Example:predator-prey relationship
Adaptations are made in response to the other animal

4. Predation
What makes them a predator?
-killing another for food
Characteristics:
Usually larger animals but sometimes small
Ex: microscopic organisms

5. Predation continued
Most animals are both predators & prey
Few species are
not considered
prey
Ex.: killer whales

6. Can’t we all just get along? Yes!
Mutualism
Can’t we all just get along? Yes!
A relationship between two species - both species benefit
Ex. Clown fish is protected & attracts food for the sea anemone

7. commensalism
Two species relationship:
one species benefits and
the other is neither harmed
nor helped

8. One organism feeds a host Usually larger live on or in their host
Parisitism
One organism feeds a host
Usually larger
live on or in their host
Can harm the host
Hosts defend by immune systems or behaviors

9. only consume plant material do not necessarily kill plant
Herbivory
only consume plant material
do not necessarily kill plant
Some plants have defense mechanisms that prevent the animal from feeding on them.

10. Summary
What could these pictures represent?