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Community All organisms inhabiting a particular area
Autotrophs Producers – self feeding Produce their own organic material Green plants Called primary producers
Heterotrophs Consumers Organisms which must consumer organic material to obtain energy
Consumers Primary Consumers Secondary Consumers
Primary Producers Control the rate at which producers convert sunlight to chemical energy in organic matter, or biomass Determines the energy budget for ecosystems
Decomposers Also called detritivores Acquire energy from all trophic levels waste products and dead material
Food Chain Pathway of food within a community Links energy and nutrients between producers, consumers and decomposers Divided into trophic levels
Trophic Structure Every community has a trophic structure Trophic levels increase as you go up the food chain
Energy levels decrease as you go up the food chain
Only approximately 10% of the energy stored at each trophic level is available at to the next level
Food Web A series of interconnected food chains
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
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Energy Flow Through the Biosphere What is the Biosphere: 1.The part of the earth’s crust, waters and atmosphere that supports life. 2.The ecosystem comprising.
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