2. Density-Dependent Limiting Factor
Limiting Factor that Depends on Population Size

4. Competition
Organisms compete with one another for available food, water, space, sunlight etc…
Example: Puffins compete for limited nesting sites

6. Predation Predator-Prey Relationships
Regulation of a population by predation.
Ex: Sea otters and killer whales regulate each others growth.

8. Parasitism
Organisms that take nourishment at the expense of their host, weakening or killing them

9. Density-Independent Factor
Affect all populations in similar ways, regardless of population size.
Usually are:
Weather
Natural Disasters
Seasonal Cycles
Human Activities