Food Webs & Energy Pyramids

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Trophic Levels

• One layer in the feeding relationship of an ecosystem

http://cleangreenenergyzone.com/wp-content/uploads/2011/03/energy-pyramid-ecosystem.jpg

Energy Pyramids

• Show relative biomass at each trophic level in an ecosystem.

http://www.edquest.ca/notesimages/foodpyramid.gif

Example of an Energy Pyramid

MAN

FOX

RABBIT

100 % of the sun’s energy

10%

1%

0.1%

10%

10%

10%

1 pound MAN

10 pounds FOXES

100 pounds RABBITS

1000pounds ofGRASS

90%

90%

90%

Energy Lost during

conversion to heat, waste….

GRASS

- The decreasing size of the pyramid shows that each level of the pyramid has a smaller and smaller mass of those organisms.