1. Population Dynamics
(Predator-Prey
relationship)

2. Population dynamics = the study of how populations change over time.
Population density: # of individuals per unit area.

3. How population size can change:
Births
Deaths
Emigration (Organisms leaving)
Immigration (Organisms entering)

4. Population Growth 1) Exponential growth
Occurs when a pop. reproduces at a constant rate.
Needs ideal conditions with unlimited resources.

5. 2) Logistic growth
Growth slows as resources become less available.
Carrying capacity (“K”) = the largest number of individuals an environment can support.

6. Limits to growth Density-dependent factors Density-independent factors
Not enough food/water/space,
disease, parasitism, predators
Density-independent factors
Natural disasters, unusual weather,
deforestation, hunting