Ecology Pyramid: Types & Importance

Ecology pyramid is a graphical depiction of various living organisms at various trophic levels. Raymond Lindman and G. Evelyn Hutchinson first made the Ecology Pyramid. 

• These pyramids are shaped like real pyramids, with broad bases that narrow at the apex. 
• The first trophic level is producers, followed by primary consumers, and so on.
• Ecological pyramids also describe how organisms in ecosystems interact with one another. 
• In these pyramids, energy flows from bottom to top, implying that energy is transferred from autotrophs to primary producers rather than primary consumers, and so on. 
• A species can exist on multiple trophic levels. 
• A sparrow, for example, is a primary consumer of fruits, seeds, and other foods. 
• When it eats worms and insects, it falls into the category of a secondary consumer. 
• Producers outnumber herbivores in both number and biomass. 
• Herbivores outnumber carnivores, and lower trophic level energy is greater than higher trophic level energy.

Read More: What is biomass?

Key terms: Ecological Pyramid, Biomass, Ecosystems, Trophic level, Food chain, Consumer, Carnivores, Sparrow, Energy

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What is Ecological Pyramid?

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An ecological pyramid is a graphical representation of the relationships between various living organisms at various trophic levels.

Ecology Pyramid

• These pyramids have the shape of actual pyramids, with the base being the broadest and being covered by the lowest trophic level, i.e., producers. 
• The next trophic level, i.e., the primary consumers, occupies the next level, and so on. 
• All calculations for the construction of these types of ecological pyramids must take all organisms in a specific trophic level.
• This is because a sample space of a few numbers or a few species will result in a large level of error.

The theory of the ecological pyramid was suggested by Raymond Linderman and G.Evylen Hutchinson. The ecological pyramid is also often known as the energy pyramid.

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Types of Ecological Pyramid

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The many types of Ecological Pyramids include:

Pyramid of Number

It denotes the number of organisms found in each trophic level. 

• The number pyramid is always upright, but in situations such as the detritus food chain, it does not show an upright position. 
• The number of organisms decreases as one moves up the pyramid. 
• Because there are a lot of producers, it's at the bottom.

Pyramid of Biomass

The amount of biomass produced by each trophic level is depicted in this ecological pyramid. 

• Except in the oceans, where large numbers of zooplankton rely on phytoplankton, the biomass pyramid is always upright. 
• In this pyramid, producers have the most biomass, followed by primary consumers, who have less biomass than producers. 
• Similarly, secondary consumers have less biomass than primary consumers, and at the top of the pyramid, biomass is present. 
• The biomass pyramid in a sea is also inverted because fish biomass exceeds phytoplankton biomass.

Pyramid of Energy

The energy pyramid is always upright because energy flow in a food chain is unidirectional and some energy is lost in the environment as trophic levels increase. This energy pyramid depicts the flow of energy from consumers to producers.

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Ecological Pyramid Importance

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The significance of the ecological pyramid can be explained as follows:

• They depict the feeding of various organisms in various ecosystems.
• It demonstrates the effectiveness of energy transfer.
• The state of the ecosystem can be monitored, and further damage can be avoided.

Read Also: Energy Flow in Ecosystem

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Ecological Pyramid Limitations

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Some of the limitations of Ecological Pyramids include:

• As with food web, multiple species may occupy multiple trophic levels. As a result, this system disregards food webs.
• Even though saprophytes are an important part of many ecosystems, they are not included in any of the pyramids.
• These pyramids are only applicable to simple food chains, which rarely occur naturally.
• These pyramids provide no information about seasonal and climatic variations.
• They do not consider the possibility of the same species existing at different levels.

Food Chain Diagram

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Things to Remember

• An ecological pyramid is a graphical representation of the relationship between various living beings at various trophic levels within a food chain. 
• The pyramid is formed on the basis of the number of organisms, energy, and biomass, all of which are shaped in the shape of a pyramid, as the name suggests.
• The bottom of the pyramid, which is also the broadest part, is occupied by the producers, who are at the first trophic level. 
• Primary consumers occupy the next level of the pyramid. This is followed by the pyramid's next level, which represents secondary and tertiary consumers.

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