Ecological Pyramids

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  • Created by: Laura
  • Created on: 05-07-13 16:59

Pyramid Of Numbers

Pyramid Shape

Any (1 Oak Tree, or lots of fleas)

How data is obtained 

Count organisms in a food chain 

Units

-

Advantages

See the amount for each organisms, can compare them

Disadvantages

No account of sizes, hard to represent each category reliably

1 of 3

Pyramid Of Biomass

Pyramid Shape

Usually pyramidal, may have smaller base

How data is obtained 

Need to be killed and dried - dry weight without water

Units

gm-2 (area - grassland) gm-3 (volume - oceans)

Advantages

More reliable and quantitive, so its comparable

Disadvantages

Need to kill organisms so its usually small samples, seasonal differences may occur. Presence of water makes it unreliable

2 of 3

Pyramid Of Energy

Pyramid Shape

Pyramidal

How data is obtained 

Collect samples in a given area over a time period

Units

kJm-2year-1

Advantages

Most accurate and reliable

Disadvantages

Difficult and complex as well as time consuming

3 of 3

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