1. SYMBIOTIC RELATIONSHIPS

2. Symbiosis is a relationship in which two different organisms live in close association with each other

3. Here are three types of symbiotic relationships

4. Mutualism ++ both organisms benefit
The small green insects (aphids)use their mouths to suck sugar from the plant. The sugar runs out through their anus providing food for the ants. The ants protect the aphids from insect predators.

5. Parasitism +- one organism benefits and the other one is harmed
The green larvae is harmed by the small white parasites. The parasites use the larvae for food.

6. Commensalism + 0 one organism benefits and the other one is unaffected (neither harmed nor benefits)
The clown fish gets a place to safely live because the stinging tentacles of the sea anemone protects it from predators. The sea anemone is unaffected by the clown fish.

7. Note: It is not necessary for you to know what the organisms are in order to figure out the correct symbiotic relationship. Pay attention to the way the organisms relate to one another.

8. Let’s practice identifying the correct symbiotic relationships of the organisms in the following scenarios.

9. The tick gets food from the deer without killing it
The tick gets food from the deer without killing it. The deer is harmed by losing blood to the tick, and possibly by getting an infected wound.
Parasitism

10. An American Robin benefits by building its nest in a Red Maple tree
An American Robin benefits by building its nest in a Red Maple tree. The tree is unaffected.
Commensalism

11. The honey bee gets to eat the pollen from the flower
The honey bee gets to eat the pollen from the flower. The dandelion uses the bee to spread its pollen to another flower.
Mutualism

12. Individual Practice You have 6 scenarios on your paper
Individual Practice You have 6 scenarios on your paper. On your own correctly identify the symbiotic relationship by placing the letter M for mutualism, P for parasitism and C for commensalism in the blanks.

13. Predation is the act of one organism killing another for food.
What is predation?
Predation is the act of one organism killing another for food.

14. On your paper, write down your own two examples of predation

15. What is the difference between parasitism and predation?
Parasitism harms the organism and usually lives in or on it’s host and may slowly or eventually lead to the host’s death. Predation is immediate conquer and eat. (predator-prey)

16. Identify whether the following scenarios are predation or parasitism

17. Predation

18. Female mosquitoes ingest blood from humans and mammals for the protein to feed their larva. The saliva of the mosquito causes the skin to become irritated and itchy.
Parasitism

19. The Lioness stalks a herd of water buffalo until she finds a young buffalo on its own and she attacks, kills and drags it back to her pride.
Predation