Biology B2 Revision: Energy Flow
Mindmap showing energy flow through food chains and how feeding relationships are represented.
- Created by: mynameonTSR
- Created on: 09-03-14 16:36
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- Energy Flow
- Pyramids of numbers and pyramids of biomass.
- Represent feeding relationships between organisms in a food chain or web.
- Pyramids of biomass.
- Show the dry mass of living material at each stage of a food chain.
- Why might they look different to pyramids of numbers?
- If producers are very large or a small parasite lives on a large animal.
- Measuring dry mass difficult- involves removing all water from organisms- kills organism.
- Why might they look different to pyramids of numbers?
- Show trophic levels better than a pyramid of numbers.
- Difficult to construct
- Dry mass kills organism
- Some organisms may feed on organisms from different trophic levels.
- Show the dry mass of living material at each stage of a food chain.
- As energy flows along food chain, some is used in growth.
- Energy measured in Joules or Kilojoules
- At each trophic level of a food chain, much energy is transferred into not very useful forms.
- Heat from respiration
- Egestion
- Excretion
- Material lost at each stage of the food chain is not wasted.
- Used by decomposers which can then start another food chain.
- 90% of the available energy can be 'lost' at each trophic level.
- Animal at the end of the food chain does not have much food available to it.
- Efficiency of energy transfer between trophic levels.
- Energy used for growth/ energy input. Written as %.
- Pyramids of numbers and pyramids of biomass.
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