Ecological Pyramids, Food Chain and Food Web

Ecological Pyramids, Food Chain and Food Web

• 1.
  Ecological Pyramids, FoodChain and Food Web by: Liwayway Memije-Cruz
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  What is anecological pyramid? • a graphical representation designed to show the biomass or productivity at each trophic level in a particular ecosystem.
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  Number Pyramid • showsthe number of organisms in each trophic level and does not take into consideration the size of the organisms and over-emphasizes the importance of small organisms. In a pyramid of numbers the higher up one move, so each consecutive layer or level contains fewer organisms than the level below it.
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  Biomass Pyramid • showsthe total mass of the organisms in each trophic level.
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  Energy pyramid. • showsthe total amount of energy present in each trophic level. • indicates the loss of energy from one trophic level to the next. • clearly illustrates that the energy transfer from one trophic level to the next is accompanied by a decrease due to waste and the conversion of potential energy into kinetic energy and heat energy.
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  Food Chain • thefeeding of one organism upon another in a sequence of food transfers . • the chain of transfer of energy from one organism to another. • the passage of energy from one tropic level to the next as a result of one organism consuming another. • simply who eats whom.
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  GRAZING FOOD CHAIN •one which goes from green plants to grazing herbivores and finally to carnivores.
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  DETRITUS FOOD CHAIN •one, which goes from dead organic matter to microorganisms and then to detritus feeding organisms.
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  Food Web • aninterlinked food chains.
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  Food Web • aninterlinked food chains.