Today

1
Todays Agenda

• Biomes Quiz
• Notes on Interactions of Living Organisms
• Study Pack 9

2
Populations in an Environment

• Study Pack 9

3
Todays Goals

• I can identify the characteristics that describe
  populations.
• I can determine the habitat and niche of a
  species in a community.

4
Population

• Population Size
• Number of individuals in a population
• Can be counted or estimated
• Changes frequently
• Births
• Deaths
• Page 539 the human population

5
Population

• Population Density
• Number of individuals that occupy a certain area
• Example If 100 mice live in an area of one
  square kilometer the population density is 100
  mice per square kilometer
• The more individuals in an area the more dense
  the population is

6
Population

• Population Spacing
• How organisms are arranged in an area
• Evenly spaced
• Randomly spaced
• Clumped together

7
Limiting Factors

• Any biotic or abiotic factor that limits the
  population size
• All ecosystems have limited food, water, and
  living space

8
Carrying Capacity

• The greatest population size that an area can
  support

9
Habitats and Niches

• The job or role of an organism in the ecosystem
  is called its niche
• What it eats
• How it gets its food
• How it interacts with others
• The place where an organism lives is called its
  habitat