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.

6H 2 O + 6CO > C 6 H 12 O 6 + 6O 2 6CO 2 + 6H 2 O + 3H 2 S > C 6 H 12 O 6 + 3H 2 SO 4 Sulfide Sulfuric Acid 13.2 Life in an ecosystem requires energy light energy