energy transfer within ecosystems apes~mr. plowman
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How Do Organisms Grow?TRANSCRIPT
Energy Transfer Within EcosystemsAPES~Mr. Plowman
How do organisms grow?
What determines the productivity of an ecosystem?
Food chains, food webs, and trophic level pyramids
How Do Organisms Grow?
Photosynthesis builds biomass
Biomass: the dry weight of an organism.• No water weight
Energy flow and nutrient cycling
Primary Productivity Gross Primary Production (GPP)
Rate at which an ecosystem’s producers convert solar energy into biomass.
Rate of photosynthesis
Net Primary Production (NPP) NPP = GPP - R
Primary Productivity
Food Chains
Primary Producer
Primary Consumer
Secondary Consumer
Tertiary Consumer
Food Webs
Trophic Levels
Energy transfer is inefficient
Pyramid of Numbers• Shows the number of organisms at each trophic level in a food chain.
Pyramids of Biomass
Final Thought If humans have a limited amount of land and
resources, what do you think is more sustainable: Eating plants Eating animals