Pyramids

# Pyramids - caterpillars. Pyramids of Biomass • Biomass is...

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Food Pyramids 2 nd Year Biology

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Energy loss in a food chain Only 10% of energy is passed along to the next level in a food chain. The rest of the energy is lost through: -waste -heat -movement -respiration
A Pyramid of Numbers Food chains and webs show the flow of materials and energy in habitats , but they do not give you any idea of how many organisms there are in the habitat. A pyramid of numbers is a diagram showing the numbers of organisms present in each level of a food chain

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Let's go back to the grass vole barn owl food chain. Suppose the numbers found in a particular habitat are as follows: 2000 grass plants 25 voles 1 barn owl
The pyramid of numbers would be as shown below.

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Sometimes you do not get a pyramid because one organism in the chain is unusually large, e.g. one large oak tree providing food for many

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Unformatted text preview: caterpillars. Pyramids of Biomass • Biomass is a word used to describe the mass of living material in an area . • If you could collect all of the plants and animals in an area and weigh them, this would be the biomass of that area. A pyramid of biomass is a diagram showing the total weight (mass) of organisms at each level of a food chain . Biomass always gives a pyramid since producers must have the most biomass and consumers must have less Pyramids of biomass are always pyramid-shaped. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching....
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## This note was uploaded on 11/23/2011 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.

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Pyramids - caterpillars. Pyramids of Biomass • Biomass is...

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