Qxi.xli
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whats the difference between trophic levels and food chains and pyrsmaids of biomass?
Tysm! xx
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bfm.mcdermott
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The trophic level is the position of an organism within a food chain.
A food chain is a succession of organisms which eat other organisms and, in turn, may be eaten themselves (i.e. it shows the different trophic levels).
A pyramid of biomass shows the biomass (dry mass) present in each different trophic level.


For example (where < means is eaten by):
A food chain may show: Grass < Mouse < Snake < Fox < Wolf.

The grass is at the first trophic level - it is a producer or 'autotroph' because it photosynthesises.
The mouse is at the second trophic level - it is the primary consumer. ETC. ETC.

A pyramid of biomass would show the biomass of the grass on the bottom, then the biomass of mice above, then the biomass of snakes above that, etc. As energy is passed up trophic levels, energy transfer becomes less efficient, so the biomass of each level decreases, and hence it has a pyramid shape.

Does that make sense?
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Qxi.xli
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(Original post by bfm.mcdermott)
The trophic level is the position of an organism within a food chain.
A food chain is a succession of organisms which eat other organisms and, in turn, may be eaten themselves (i.e. it shows the different trophic levels).
A pyramid of biomass shows the biomass (dry mass) present in each different trophic level.


For example (where < means is eaten by):
A food chain may show: Grass < Mouse < Snake < Fox < Wolf.

The grass is at the first trophic level - it is a producer or 'autotroph' because it photosynthesises.
The mouse is at the second trophic level - it is the primary consumer. ETC. ETC.

A pyramid of biomass would show the biomass of the grass on the bottom, then the biomass of mice above, then the biomass of snakes above that, etc. As energy is passed up trophic levels, energy transfer becomes less efficient, so the biomass of each level decreases, and hence it has a pyramid shape.

Does that make
thank you for your reply, i understand the food chain but isn't that basically the same as the torpich level? xx
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bfm.mcdermott
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(Original post by vix.xvi)
thank you for your reply, i understand the food chain but isn't that basically the same as the torpich level? xx
They are very similar. I guess the easiest way to look at it is to picture this:

This is the food chain:
Snake
|
Mouse
|
Grass

This is a trophic level:
Grass (producer)

So I guess a trophic level is looking at a single organism and it's position in the food chain (producer, primary consumer, secondary consumer, etc.), whereas a food chain shows all the trophic levels put together.

Does that help?
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