Pyramids of numbers in hedgerow ecosystems
Pyramids of numbers show how many organisms can be found at each
feeding level or trophic level in a food chain. How many grass plants, aphids
and hoverflies are there in the hedge bottom community above?
• Grass plants =
• Aphids =
• Ladybirds =
On a piece of graph paper, try drawing your own pyramids of numbers for
the following hedgerow communities. Don’t forget to make sure your scale is
correct and your bars are centred around the same point.
Pyramid 1
Pyramid 2
Are pyramids of numbers for all ecosystems pyramid-shaped?
What could you do instead of counting numbers at each trophic level, to represent
an ecosystem?