Ecological Pyramids graphs which illustrate the trophic levels
- Slides: 12
Ecological Pyramids: graphs which illustrate the trophic levels in a community.
Most ecological pyramids are large at the base and narrow at the top. This is because every time that an organism is eaten by the next trophic level, some of the energy is lost as heat. Less Energy More Energy
3 TYPES OF PYRAMIDS: 1. Pyramid of Biomass 2. Pyramid of Energy 3. Pyramid of Numbers
Pyramid of Biomass: • Illustrates the amount of biomass in each trophic level – Biomass weight is determined after dehydration • Shows the amount of matter lost between trophic levels. • Measured in Kg, grams or pounds
Pyramid of Biomass
Pyramid of Energy: • Shows the energy available at each trophic level. – The size of the blocks represents the proportion of productivity – Measured in Joules or Calories
Pyramid of Energy: • Most of the energy available to the community is in the 1 st trophic level. • Only 10 -20% of the energy is available to the next trophic level (≈ 90% lost)
Pyramid of Numbers: • Illustration of the number of organisms at each level
What kind of Pyramid is this? Energy, the trophic levels are measured in Kilocalories
Human Population Growth How can more people be supported on Earth when there is a limited supply of resources? It depends on what they are eating…
The End or is it just the beginning…
Energy pyramid
Food chains, food webs and ecological pyramids
Which ecosystem is this nutrient cycle from?
Biozone unit 1 and 2
End behaviour chart
Primary consumers
Energy in trophic levels
The position an organism occupies on the food web
Lowest trophic level
Food webs and energy transfer
Lion belongs to what trophic levels
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How does energy flow in an ecosystem
