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