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Get Answers to all your Questions
8. Define ecological pyramids and describe with examples, pyramids of number and biomass.
Answers (1)
Ecological pyramid- The graphical representation of an ecological parameter such as number, biomass or energy, sequence-wise in various trophic levels of a food chain in which producers are at the base, herbivores in the middle and carnivores at the top level. Ecological pyramids can be upright, inverted, or spindle-shaped. The three common types of ecological pyramids include the pyramid of numbers, the pyramid of biomass and the pyramid of energy.
1. Pyramids of number- It is the number of individuals per unit area at various trophic levels. It is generally upright, however, the pyramid of numbers in the area of a big tree is generally inverted because the number of insects that feed on the tree generally exceeds in number. Eg.- Grassland ecosystem.
2. Pyramids of biomass- These represent the biomass in various trophic levels. A pyramid of biomass is upright except in an aquatic food chain. A pyramid of biomass in the sea is generally inverted because the biomass of fish is generally more than that of phytoplankton. Eg.- Forest ecosystem.
3. Pyramids of energy- It is the graphic representation of the amount of energy trapped at different trophic levels per unit area. The pyramid of energy is always upright. Eg.- Forest ecosystem.
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