Populations

1
Populations

• Chapter 5
• Unit 2

2
Characteristics of Populations

• Geographic Distribution
• Population Density
• Growth Rate

3
Factors that affect Population Growth

• Births
• Deaths
• Individuals that enter or leave the population
• Immigration
• Emigration

4
Exponential Growth

• reproduce at a constant rate
• with unlimited resources, a population will grow
  exponentially

5
Logistic Growth

• Growth slows or stops
• resources become less available
• Carrying capacity

6
Limiting Factors

• causes population growth to decrease
• Density Dependent Factors
• Become limiting only when the population density
  reaches a certain level

7

• Density Independent Factors
• Affects all populations in similar ways,
  regardless of the population size