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13.2 Biotic and Abiotic Factors
KEY CONCEPT
Every ecosystem includes both living and nonliving
factors.
13.2 Biotic and Abiotic Factors
An ecosystem includes both biotic and abiotic factors.
• Biotic factors are living things.
– plants
– animals
– fungi
– bacteria
plants
13.2 Biotic and Abiotic Factors
• Abiotic factors are nonliving things.
– moisture
– temperature
– wind
– sunlight
– soil
moisture
sunlight
13.2 Biotic and Abiotic Factors
Changing one factor in an ecosystem can affect many
other factors.
• Biodiversity is the assortment, or variety, of living things in
an ecosystem.
• Rain forests have more biodiversity than other locations in
the world, but are threatened by human activities.
13.2 Biotic and Abiotic Factors
• A keystone species is a species that has an unusually large
effect on its ecosystem.
keystone
13.2 Biotic and Abiotic Factors
• Keystone species form and maintain a complex web of life.
creation of
wetland
ecosystem
increased waterfowl
Population
increased
fish
population
nesting
sites for
birds
keystone species

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13.2 Biotic and Abiotic Factors.ppt

  • 1. 13.2 Biotic and Abiotic Factors KEY CONCEPT Every ecosystem includes both living and nonliving factors.
  • 2. 13.2 Biotic and Abiotic Factors An ecosystem includes both biotic and abiotic factors. • Biotic factors are living things. – plants – animals – fungi – bacteria plants
  • 3. 13.2 Biotic and Abiotic Factors • Abiotic factors are nonliving things. – moisture – temperature – wind – sunlight – soil moisture sunlight
  • 4. 13.2 Biotic and Abiotic Factors Changing one factor in an ecosystem can affect many other factors. • Biodiversity is the assortment, or variety, of living things in an ecosystem. • Rain forests have more biodiversity than other locations in the world, but are threatened by human activities.
  • 5. 13.2 Biotic and Abiotic Factors • A keystone species is a species that has an unusually large effect on its ecosystem. keystone
  • 6. 13.2 Biotic and Abiotic Factors • Keystone species form and maintain a complex web of life. creation of wetland ecosystem increased waterfowl Population increased fish population nesting sites for birds keystone species