Ecological-Pyramids.pdf, Exercises of Biology

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By, Ms. Roja Lecturer Dept. of Botany

 The arrangement of biotic components of the food chain according to their size, metabolic relationship is known as ‘Trophic Structure’.

 This is specific to each ecosystem.

 This relationship between the various trophic levels of a food chain (Producers  herbivores  carnivores) can be shown diagrammatically by ‘Ecological pyramids’.

 Ecological pyramids was first proposed by British Ecologist, Charles Elton (1927), and can also be called as ‘Eltonian pyramids’.

 It shows the relationship between the producers, herbivores and carnivores in terms of their numbers.

 This indicates the number of organisms at every trophic level.

tertiary consumers

secondary consumers

primary consumers

producers

5

5000

500,

producers 5,000,0005,000,

Grassland Ecosystem

Pond Ecosystem

 The amount of living material in an organism

is called biomass.

 Pyramid of biomass shows quantitative

relationship existing at various trophic levels.

Grassland Ecosystem

Forest Ecosystem

Pond Ecosystem (Inverted)