1. Relationships in the Ecosystem

2. Predators and Prey
Predator – consumer that actively hunts other living organisms.
Prey – consumed by predators.
Predator and prey populations are linked.
If prey population increases, predator population increases.

3. Symbiosis Any relationship in which two species live closely together
3 types:
Parasitism
Commensalism
Mutualism

4. Parasitism
Relationship in which one organism feeds on the tissues or body fluids of another.
One organism benefits and one organism is harmed.
Host - parasite feeds on this organism.
Ex. – ticks, lice, fleas, tapeworm.

5. PARASITISM

6. Commensalism
One organism benefits and the other is neither harmed nor helped.
Ex. – Whales & Barnacles – whales are not affect. The barnacles get a free ride & food.

7. COMMENSALISM

8. Mutualism Both organisms benefit.
Some are necessary for the survival of both organisms.
Ex. – yucca plant & yucca moth – cannot survive without one another.

9. MUTUALISM