Math, asked by vamshikrishna77, 1 year ago

Explain about ecological pyramids and their types

Answers

Answered by Priyanshi3204

An ecological pyramid (also trophicpyramid, eltonian pyramid, energypyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or bio productivity at each trophic level in a given ecosystem.

1.Pyramid of Number: It depicts the number of individual organisms at different trophic levels of food chain. ..
2.Pyramid of Biomass: The biomass of the members of the food chain present at any one time forms the pyramid of the biomass. ..
3.Pyramid of Energy:

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Answered by vedu21

Answer:

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3 Types of Ecological Pyramids of an Ecosystem: by Charles Elton

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Some of the important types of Ecological Pyramids of an Ecosystem are 1. Pyramids of numbers 2. Pyramids of biomass 3. Pyramid of energy!

The trophic structure and function of successive trophic levels, i.e. producer’s → herbivores → carnivores, may be shown graphically by means of ecological pyramids where the first or producer level constitutes the base of the pyramid and the successive levels, the tiers making the apex. Ecological pyramids were developed by Charles Elton (1927) and are, therefore, also called Eltonian pyramids. Ecological pyramids are of three general types.

1. Pyramids of numbers:

They show the relationship between producers, herbivores and carnivores at successive trophic levels in terms of their number. In a grass land ecosystem the pyramid becomes upright.

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Similarly in a pond ecosystem the pyramid is upright. In a forest ecosystem, however, the pyramid of numbers is somewhat different in shape. The producers, which are mainly large-sized trees, are lesser in number and form the base of the pyramid. The herbivores, which are the fruit- eating birds, elephants etc., are more in number than the producers. Then there is a gradual decrease in the number of successive carnivores, thus making the pyramid again upright. However, in a parasitic food chain, the pyramids are always inverted.

The pyramids of numbers do not give a true picture of the food chain as they are not very functional. They generally vary with different communities with different types of food chains in the same ‘environment.

2. Pyramids of biomass:

The biomass of the members of the food chain present at any one time forms the pyramid of the biomass. They are comparatively more fundamental, as they, instead of geometric factor, show the quantitative relationship of the standing crops. In grassland and forests, there is generally a gradual decrease in, biomass of organisms at successive levels from the producers to the top carnivores. Thus pyramids are upright. However, in a pond the pyramid of biomass is inverted in shape.

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3. Pyramid of energy:

It is a graphic representation of amount of energy trapped per unit time and area in different trophic levels of food chain with producers forming the base and top carnivores the tip. The energy content is expressed as Kcal/m2/yr. Of the three types of ecological pyramids, the energy pyramids give the best picture of overall nature of the ecosystem.

The pyramids of energy indicates not only the amount of energy flow at each level, but more important the actual role the various organisms play in the transfer of energy. In shape it is always upright, as in most of the cases there is always a gradual decrease in the energy content at successive trophic levels from the producers to various consumers. clip_image006