1. Food Webs

2. Community All organisms inhabiting a particular area

3. Autotrophs Producers – self feeding Produce their own organic material Green plants Called primary producers

4. Heterotrophs Consumers Organisms which must consumer organic material to obtain energy

5. Consumers Primary Consumers Secondary Consumers

6. Primary Producers Control the rate at which producers convert sunlight to chemical energy in organic matter, or biomass Determines the energy budget for ecosystems

7. Decomposers Also called detritivores Acquire energy from all trophic levels waste products and dead material

8. Food Chain Pathway of food within a community Links energy and nutrients between producers, consumers and decomposers Divided into trophic levels

9. Trophic Structure Every community has a trophic structure Trophic levels increase as you go up the food chain

10. Energy levels decrease as you go up the food chain

11. Only approximately 10% of the energy stored at each trophic level is available at to the next level

12. Food Web A series of interconnected food chains

13. Biomass A measure of the dry weight of an organism is a rough measure of the energy it contains A measure of the population multiplied by the weight of an average individual in it