1. IDENTIFY SYMBIOSIS, INCLUDING COMMENSALISM, MUTUALISM, AND PARASITISM
Shaping an Ecosystem
BIOLOGY
OBJECTIVE:
IDENTIFY SYMBIOSIS, INCLUDING COMMENSALISM, MUTUALISM, AND PARASITISM

2. Vocabulary
Commensalism Competition Competitive Exclusion Principle Habitat Mutualism Niche Parasitism Predation Symbiosis

3. What is a Niche? AN ORGANISM’S NICHE INCLUDES:
A NICHE IS THE ROLE OF AN ORGANISM IN ITS ENVIRONMENT.
AN ORGANISM’S NICHE INCLUDES:
• WHAT IT EATS
• WHAT EATS IT / HOW IT DEFENDS ITSELF
• HOW AND WHEN IT REPRODUCES
• HOW IT INTERACTS WITH OTHER ORGANISMS

4. HOW IS A NICHE DIFFERENT FROM A HABITAT?
What is a Niche?
HOW IS A NICHE DIFFERENT FROM A HABITAT?
A HABITAT IS JUST THE PLACE AN ORGANISM LIVES, BUT A NICHE INCLUDES THE ORGANISM’S INTERACTION WITH OTHERS.

5. What is competition?
TWO OR MORE ORGANISMS THAT TRY TO USE THE SAME RESOURCE AT THE SAME TIME.

6. What is the competitive exclusion principle?
NO TWO SPECIES CAN HAVE THE SAME NICHE AT THE SAME TIME

7. ONE ORGANISM (PREDATOR) CATCHES AND EATS ANOTHER ORGANISM (PREY)
What is predation?
ONE ORGANISM (PREDATOR) CATCHES AND EATS ANOTHER ORGANISM (PREY)

8. A RELATIONSHIP IN WHICH TWO ORGANISMS LIVE CLOSELY TOGETHER.
What is symbiosis?
A RELATIONSHIP IN WHICH TWO ORGANISMS LIVE CLOSELY TOGETHER.

9. What is mutualism? A. MUTUALISM: BOTH SPECIES BENEFIT
EXAMPLE: AN INSECT POLLINATING A FLOWER

10. What is commensalism?
B. COMMENSALISM: ONE ORGANISM BENEFITS AND THE OTHER IS NOT AFFECTED.
EXAMPLE: BARNACLE LIVING ON A WHALE.

11. EXAMPLE: FLEAS LIVING ON A DOG
What is parasitism?
C. PARASITISM: ONE SPECIES (PARASITE) LIVES IN OR ON ANOTHER SPECIES (HOST)
EXAMPLE: FLEAS LIVING ON A DOG