1. GROWTH MODELS pp

2. birth rate: # of births occurring in a given amount of time
death rate: # of deaths occurring in a given amount of time
Population growth: # of births is greater than the # of deaths
Zero population growth:
# of births is equal to # of deaths

3. REGULATING POPULATION SIZE AND GROWTH
Limiting factors: restrains population growth
Density-independent factors: no regard for population density
EX. Weather, seasons, natural disasters
Density-dependent factors: increase or become more prominent when the population density increases
EX. predation, pollution, food shortage

4. EXPONENTIAL MODEL

5. EXPONENTIAL MODEL:
Increase on the y axis (population size) much faster than on the x axis (time)
The larger the population, the faster it grows
birth and death rates are constant (b > d)
limited by density-independent factors

6. LOGISTIC MODEL

7. Starts off exponential (b> d)
Levels off as it reaches carrying capacity (K = maximum number of individuals an environment can sustain)
This is when b = d rates (zero population growth)
Limited by density-dependent factors