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Food Webs
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