Abundance and Distribution of Organisms Within a Habitiat
- Created by: catrinbevan
- Created on: 09-01-17 23:12
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Energy Flow Through the Ecosystem
Energy source -
- Ultimate source for most ecosystems is the sun - energy is released in the form of electromagnetic waves (other than chemosynthesis).
- Lot sof energy reaches the atmosphere but does not penetrate it - is reflected or absorbed instead.
- 90% reaching surface of earth is reflected or absorbed as heat.
- Only 10% is used by plants, 1-5% is utilised, the rest is lost - by reflection or water loss.
Food Chains and Food Webs
- Autotrophes are the source of food for heterotrophes
- Energy is transferred through a sequence of organisms - food chain
- Each stage is called a trophic level
1 - Grazing Food Chain
- 1st trophic level - primary producers…
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