13.2 biotic and abiotic factors objective: students will know that an ecosystem includes both biotic...
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13.2 Biotic and Abiotic Factors
Objective: Students will know that an ecosystem includes both biotic and abiotic factors AND that changing one factor in an ecosystem can affect many other factors.
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13.2 Biotic and Abiotic Factors
KEY CONCEPT Every ecosystem includes both living (biotic) and nonliving (abiotic) factors.
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13.2 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
– soilmoisture
sunlight
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13.2 Biotic and Abiotic Factors
• List the biotic and abiotic factors in this picture• Share with your neighbors
Every ecosystem contains biotic and abiotic factors
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13.2 Biotic and Abiotic 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. (50% of the world’s plant and animals species are here)
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13.2 Biotic and Abiotic Factors
• Biodiversity has to do with:
Number of species NOT Population number
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13.2 Biotic and Abiotic Factors
• Extinctions lower biodiversity!!!
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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. Ex: A beaver
keystone
• Their removal from the ecosystem may cause a ripple effect felt across an entire ecosystem
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13.2 Biotic and Abiotic Factors
• By felling trees to construct dams, Beavers:– Change free flowing streams into ponds, wetlands, and
meadows– Lead to an overall increase in biodiversity
creation ofwetlandecosystem
increased waterfowlPopulation
increased fishpopulation
nesting sites for birds
keystone species
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13.2 Biotic and Abiotic Factors
• More variety of fish- Fish attract birds• Insects inhabit pond and dead trees along the shore-
Insects attract birds• Animals that prey on birds are attracted to the pond
creation ofwetlandecosystem
increased waterfowlPopulation
increased fishpopulation
nesting sites for birds
keystone species
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13.2 Biotic and Abiotic Factors
Other keystone species