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11-28-07 - BIO 311D Trophic levels in prairie 4th level...

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BIO 311D 28/11/2007 10:05:00 Trophic levels in prairie 4 th  level consumers o top carnivors, parasites, detritovres, decomposers 3 rd  level consumers o same 2 nd  level cosumers o same 1 st  level consumers o herbivores, parasites, detritivores, decomposers primary producers (autotrophs) o photoautotrophs, chemoautotrophs Said difference between decomposers and detritovores at some  point above Food chain and webs nutrient cycle and energy flows through ecosystem food chain comosed of  . . food chain is just a straight line association while  a food web is a linked one  with multiple arrows going in many different directions Energy losses energy transfers are never 100% efficient .
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. Pyramids each trophic level has less biomass, fewer organisms and less energy than  the one bleow it energfy is ost as each step to: o heat o organism’s activities o growth and repoduction different kinds of pyramids: o
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