Warm Up 10 4/17 The area inhabited by a population # of individuals per unit area When death rate exceeds birthrate, the population will (increase/decrease) (immigration/emigration) causes a decrease in population. Exponential growth or Logistic growth? 5. When resources are unlimited, population grows at a constant rate 6. Characterized by a S-shaped curve. 7. In logistic growth, ______________ is eventually reached, which is the largest # of individuals a population can hold.

5.2 Limits to Growth

Limiting Factors factor that causes population growth to decrease Ex: Competition, predation, parasitism, disease, drought, human disturbances 2 Types: Density-Dependent Factors Density-Independent Factors

1) Density-Dependent Factors Factor that depends on population size Affect large/dense populations, not small/scattered

Density-dependent limiting factors Competition (same or different species)

Density-dependent factors Predation (Predator-prey relationship)

Density-dependent factors Parasitism and Disease- weakens host causing disease/death

2) Density-Independent factors Affect ALL populations regardless of size Unusual weather, natural disasters, seasonal cycle, human activities

3. Density-dependent factors operate most strongly when a population is large and dense. large but sparse. small and sparse. small, but growing.

4. Within a limited area, if the population of a predator increases, the population of its prey is likely to increase. decrease. remain about the same. become extinct.

5. Which of the following is a density- independent factor affecting populations? predation disease a destructive hurricane parasites