Populations

1
Populations

• Studied through
• Size-number of individuals
• Density-how many are in a certain area
• Distribution-arrangement of individuals within a
  given amount of space
• Clumped
• Random
• Even
• Clumped Random
  Even

2
Population Size

• Growth rate birth rate death rate
• 2 types of growth
• 1. Exponential growth
• J shaped curve
• Any population
  has the potential to
  increase with
  unlimited resources

3
Types of Growth Cont.

• 2. Logistic growth
• S curve
• As population grows, resources become limited and
  growth of population stabilizes
• Carrying Capacity-the number of individuals that
  can be supported by an ecosystem

4
Ways Populations Can Be Limited

• Density-dependent factors-tends to be biotic
  factors
• Ex. Food competition, living space
• Density-independent factors-tends to be abiotic
  factors
• Ex. Climate, natural disasters