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INtent
INtent
To be able to read and understand pyramids of numbers and biomass when looking at data on communities.
Setting the scene : babies?
Setting the scene : babies?
What difference can you see in the numbers of offspring? Why might there be such a difference?
Quantifying comminities: Pryamids of numbers
Quantifying comminities: Pryamids of numbers
We can cound each individual at each trophic level
1 lion
for every 7 Giraffes
For evey thousand trees
With the producers at the bottom, this looks like a pryamid.
They don't always look like pryamids though.......
One sparrowhawk
5 Bluetits
100 Caterpillars
1 Oak tree
Pyramids of biomass
Pyramids of biomass
Bio - meaning alive
Mass - an amount of something
Biomass - The amount of living stuff.
A pyramid of biomass is a chart, drawn to scale, showing the biomass at each stage in a food chain. The bars become narrower as you reach the top. This pyramid of biomass is for the food chain:
oak tree → caterpillar → blue tit → sparrowhawk
Note that you do not need to draw the organisms. But you must draw your pyramid of biomass to scale. Each bar should be labelled with the name of the organism.
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