13.2 biotic and abiotic factors -...
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13.2 Biotic and Abiotic Factors
KEY CONCEPT Every ecosystem includes both living and nonliving factors.
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13.2 Biotic and Abiotic Factors
! An ecosystem includes both biotic and abiotic factors.
• Biotic factors are living things. – plants – animals – fungi – bacteria
plants
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13.2 Biotic and Abiotic Factors
• Abiotic factors are nonliving things. – moisture – temperature – wind – sunlight – soil
moisture
sunlight
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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.
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13.2 Biotic and Abiotic Factors
• A keystone species is a species that has an unusually large effect on its ecosystem.
keystone
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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