1. Activity 1
Relationships

2. Directions
Use the information in this PowerPoint presentation to respond to questions in your guided notes.

3. Symbiosis
A close and often long term interaction between two or more different species.
The relationship between these different species may be neutral, negative or positive.
There are 4 types of symbiotic relationships we will explore today
Predation
Mutualism
Commensalism
Parasitism

4. Predation
Predation refers to one organism capturing and feeding on another organism
Organism Roles
Predator: the organism that is doing the killing
Prey: the organism that is being eaten (food)

5. Predation Example Lions eating a buffalo Predator: Lion Prey: buffalo
Snake eating a frog
Predator: snake
Prey: frog

6. Mutualism
Both species in this type of relationship benefit from the interactions that they share
It is a “WIN-WIN” situation

7. Example: Mutualism Insects and flowers
Insect: gets nectar and food from flower
Flower: the insect spreads the pollen or seeds of the flower so it can continue to reproduce

8. Commensalism
One organism in the relationship benefits and the other organism is neither helped nor harmed
It is a “WIN-nothing” situation

9. Example: Commensalism
Barnacles attach to the surface (skin) of whales
Barnacles: get nutrients from the whale that allow it to grow
Whale: the presence of the barnacles neither harms or benefits the whale in any way

10. Parasitism
One organism lives on or inside of another organism and harms it
Parasite: the organism doing the harm
Host: the other organism that is being harmed
The parasite obtains all or part of its nutrition from the host
It is a “WIN-LOSE” situation

11. Example: Parasitism Ticks attach to dogs and suck the blood from them
Ticks: get nutrients from the blood of the dog
Dog: can get sick from diseases the tick may carry or can die from blood loss; discomfort (causing irritation to the skin)