Sunday, 22 May 2011

4.5 Food Chains and Food Webs

Understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer.
FOOD CHAIN
Food chain links together the Producer to the Primary Consumer to the Secondary Consumer and then to the Tertiary Consumer.
  • One organism per trophic level.
  • In a food chain you cannot show an animal being an omnivore (eating plants and meat) or having 2 or more trophic levels.
  • It shows the flow of matter and flow of energy.
FOOD WEB
Allows us to provide a better description of the ecosystem
Ecosystem is composed of community of organisms which are interactive in this case the interaction the food web describes is feeding
It shows organisms feeding at different trophic levels.
Organisms can have multiple predators, multiple prey results in food chain becoming linked.
Example of a food Web:
(P=Producer, 1=Primary Consumers, 2=Secondary Consumers, 3=Tertiary Consumers)


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