Presentation on theme: "Bellringer You are trying to stop world hunger. On your quest to do so, you choose to provide food for a third world country. Which would be ideal to provide:"— Presentation transcript:
Bellringer You are trying to stop world hunger. On your quest to do so, you choose to provide food for a third world country. Which would be ideal to provide: grains or meat? Why?
What is an ecosystem? An ecosystem consists of –all the organisms in a community and –the abiotic environment with which the organisms interact. In an ecosystem, energy flow moves through the components of an ecosystem and chemical cycling is the transfer of materials within the ecosystem.
A Terrarium A terrarium represents the components of an ecosystem and illustrates the fundamentals of energy flow. Light energy Chemical energy Energy flow Chemical elements Heat energy Bacteria, protists, and fungi
In real time… http://www.youtube.com/watch?v=09iy-H9-coU
Figure 37.15 Open ocean Estuary Algal beds and coral reefs Desert and semidesert scrub Tundra Temperate grassland Cultivated land Boreal forest (taiga) Savanna Temperate deciduous forest Tropical rain forest 05001,0001,5002,0002,500 Average net primary productivity (g/m 2 /yr)
Figure 37.16A Plant material eaten by caterpillar 100 kilocalories (kcal) 50 kcal 35 kcal 15 kcal Feces Cellular respiration Growth 50% is eliminated in feces, 35% is used in cellular respiration 15% is used for growth.
Why do food chains and webs typically have only three to five levels?