Ecosystems and Conservation Biology Chapter 36 Part 2.

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Presentation transcript:

Ecosystems and Conservation Biology Chapter 36 Part 2

36.2 Energy flows through ecosystems

Productivity of Ecosystems Only about 1% of the sun’s energy is harnessed by photosynthesis Still enough to produce Earth’s biomass –Organic material

Productivity of Ecosystems Primary productivity –Rate at which producers in an ecosystem build biomass

Ecological Pyramids Follows transfer of energy through ecosystem

Energy Pyramids Emphasizes energy loss from one trophic level to the next In general, only 10% transferred each time

Biomass Pyramid Represents actual biomass (dry mass of all organisms) in each trophic level

Pyramid of Numbers Number of individual organisms in each trophic levels