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

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.

13.2 Biotic and Abiotic Factors

Tropical rainforests have the highest level of biodiversity.

13.2 Biotic and Abiotic Factors

• A keystone species is an organism that links many other species together. This species that has an unusually large effect on its ecosystem

keystone

13.2 Biotic and Abiotic Factors

Salmon are keystone species in the temperate rainforest.

•Critical fall food source for the grizzly bear, wolves, eagles and otters.•Act as fertilizer for the trees.

6H2O + 6CO2 ----------> C6H12O6+ 6O2

6CO2 + 6H2O + 3H2S ----------> C6H12O6+ 3H2SO4

Sulfide SulfuricAcid

13.2 Life in an ecosystem requires energy

light energy