energy and ecosystems
- Created by: Maddy Glasbey
- Created on: 09-01-13 21:54
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- Energy and Ecosystems
- Not all light energy available from the Sun is absorbed by the producer
- Not all wavelengths can be absorbed
- Some light energy may miss the chlorophyll molecule
- Another factor may be limiting the rate of photosynthesis
- Why is energy lost between trophic levels?
- Some material, e.g cellulose or bones, will be indigestable so lost in faeces
- Heat energy in respiration for muscle contractions
- Excetory materials such as urine
- PRODUCTIVITY
- Can be increased wth use of fertilisers
- Provide nitrates for absorption by plants to build up proteins and amino acids for growth
- Net productivity= Gross productivity- respiratory losses
- INTENSIVE FARMING
- little space, so restricted movement and less energy lost as heat in respiration for muscle contractions
- Controlled food with little indigestable material, and energy efficient
- slaughtered when young- majority of energy used for growth
- Temperatures kept wam to reduce respiration for constant body temp
- Can be increased wth use of fertilisers
- Pest control
- PESTICIDES
- Not always specific to target species- may harm others or accumulate in the tissue of animals in food chain
- Pests can develop resistance- have to be reapplied
- BIOLOGICAL
- Very specific and once implemented reproduce itself
- May themselves become pests
- PESTICIDES
- Untitled
- Not all light energy available from the Sun is absorbed by the producer
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