H.1.4.10 Pyramid of Numbers Worksheet - PDST
H.1.4.10 Pyramid of Numbers Worksheet
Extended Study
Use of Pyramid of Numbers
Ecological pyramids are used _____________________________________________________
______________________________________________________________________________
They attempt to ________________________________________________________________ as a chart by counting the number of individuals at each trophic level
Pyramid of Numbers
In general:
The number of organisms ______________________________________________ the pyramid
This is due to the large __________________________ (about 90%) between each trophic level
As a result there is ______________________________________________________________ the pyramid
__________________________________________________ increase as you go up the pyramid
Energy Transfer
This is the flow of energy _______________________________________________ from the sun; and _________________________________________ through the different trophic levels along food chains, and finally __________________________________ into the atmosphere as heat loss due to respiration.
Energy transfer through an ecosystem
Energy Loss in a Food Chain
Energy loss in a Food Chain or Ecosystem
From the previous slide we can see that only about _______________________________________ __________________________________when one member of a food chain is eaten by the next
The large energy loss from one trophic level to the next ___________________________________
________________________________________________________________________________
Each trophic level contains __________________________________________________________
Normal Pyramid of Numbers
A reminder of what a pyramid of numbers looks like
(Name the trophic levels)
[pic]
Limitations of use
The ________________________________________________________ in a pyramid of numbers.
e.g. one rose bush can support thousands of greenfly.
(Complete the trophic levels for this example)
[pic]
A distorted Pyramid of Numbers
A similar problem arises with __________________ – ____________________________________ – resulting in a distorted pyramid
An inverted Pyramid of Numbers
When organism size is not considered very unusual pyramid shapes are likely to occur.
(Complete the trophic levels for this example)
[pic]
Another example
Last example
Need to know
Explain the limitations of use regarding the size of organisms
State two inferences (conclusions) that can be made regarding the shape of the pyramid e.g. large tree or parasites
Explain the energy loss shown in the pyramid
END
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