1. POPULATION ECOLOGY pp

2. Organism Population  Community 
Ecosystem  Biosphere
Population: group of organisms of one kind living together within a community (ex. population of senorita fish)
Populations have specific functions/jobs within the community

3. PROPERTIES Size: # of individuals a population contains Density
how crowded a population is
# of individuals/unit area
Dispersion: spatial distribution

5. Dispersion continued
clumped: individuals clustered because of something favorable
uniform: very evenly spaced due to territory (birds) or competition (desert plants)
random spacing: no pattern due to predation (snakes) or random seed dispersal (flowers)

7. POPULATION MODELS Survivorship Curves
Type III: Most offspring die early in age so they must reproduce many offspring (EX insects, plants, or fish)
Type II: Organisms die at equal rates (EX. Small mammals or birds)
Type I: Organisms nurture offspring which live longer and die later in life (EX. Large mammals like humans or elephants)

8. POPULATION MODELS
Also called growth curves

9. Exponential Model
The larger the population, the faster it grows

10. LOGISTIC MODEL

11. Starts off exponential but levels off as resources become limited
The environment can sustain a maximum number of individuals