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Ecological Pyramids, Food Chain and
Food Web
by: Liwayway Memije-Cruz
What is an ecological pyramid?
• a graphical
representation
designed to
show the
biomass or
productivity at
each trophic
level in a
particular
ecosystem.
Number Pyramid
• shows the 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.
Biomass Pyramid
• shows the total mass of the organisms in each
trophic level.
Energy pyramid.
• shows the 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.
Food Chain
• the feeding 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.
GRAZING FOOD CHAIN
• one which goes from green plants to grazing
herbivores and finally to carnivores.
DETRITUS FOOD CHAIN
• one, which goes from dead organic matter to
microorganisms and then to detritus feeding
organisms.
Food Web
• an interlinked food chains.
Food Web
• an interlinked food chains.

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Ecological Pyramids, Food Chain and Food Web

  • 1. Ecological Pyramids, Food Chain and Food Web by: Liwayway Memije-Cruz
  • 2. What is an ecological pyramid? • a graphical representation designed to show the biomass or productivity at each trophic level in a particular ecosystem.
  • 3. Number Pyramid • shows the 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.
  • 4. Biomass Pyramid • shows the total mass of the organisms in each trophic level.
  • 5. Energy pyramid. • shows the 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.
  • 6. Food Chain • the feeding 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.
  • 7. GRAZING FOOD CHAIN • one which goes from green plants to grazing herbivores and finally to carnivores.
  • 8. DETRITUS FOOD CHAIN • one, which goes from dead organic matter to microorganisms and then to detritus feeding organisms.
  • 9. Food Web • an interlinked food chains.
  • 10. Food Web • an interlinked food chains.