1. 18.3 Types of Interactions

2. Limiting Factors & Carrying Capacity
Limiting Factor – something that limits the size of a population
Ex: Food, Water, Space
Carrying Capacity – the largest population that an environment can support.
Limiting factors influence the carrying capacity.

3. Competition
Competition occurs when two organisms try to use the same resources.
Can be within a population or a community

4. Predation Prey – organism that is killed & eaten by another
Predator – organism that kills another for food.
Predators have adaptations that help them capture their prey (i.e. speed, sharp teeth, claws).
Prey also have adaptations to protect themselves (i.e. camouflage, poison).

5. Symbiosis
Symbiosis is the long term association or relationship between organisms that benefits at least 1 organism.
3 Types: Mutualism, Commensalism, Parasitism

6.   Mutualism Symbiotic relationship in which both organisms benefit.
Example:

7. Commensalism
Symbiotic relationship in which one organism benefits and the other is unaffected.
 
Example:

8. Parasitism
Symbiotic relationship in which one organism benefits and the other is harmed.
 
Example:

9. Video Time

10. Comprehension Check
How do limiting factors affect the carrying capacity?
How are the three types of symbiosis different?
How are predation and parasitism different?