Taking the example of a lake as a simple aquatic ecosystem, interpret

1.	Taking the example of a lake as a simple aquatic ecosystem, interpret how various functions of this ecosystem are carried out. Make a food chain that is functional in this ecosystem.
Answer» (i) Productivity - conversion of inorganic into organic material with the help of solar energy by the autotrophs (ii) Energy flow - unidirectional movement of energy towards higher trophic level (and its dissipation and loss as heat to the environment) (iii) Decomposition - fragmentation, leaching, catabolism, humification, mineralization by bacteria, fungi and flagellates (abundant at the bottom of lake) (iv) Nutrient cycling - decomposition of dead matter to release the nutrients back to be re-used by the autotrophs Food chain in aquatic ecosystem (lake) Phytoplanktons → Zooplanktons → Small fish → Big fish

Taking the example of a lake as a simple aquatic ecosystem, interpret how various functions of this ecosystem are carried out. Make a food chain that is functional in this ecosystem.

Answer»

(i) Productivity - conversion of inorganic into organic material with the help of solar energy by the autotrophs

(ii) Energy flow - unidirectional movement of energy towards higher trophic level (and its dissipation and loss as heat to the environment)

(iii) Decomposition - fragmentation, leaching, catabolism, humification, mineralization by bacteria, fungi and flagellates (abundant at the bottom of lake)

(iv) Nutrient cycling - decomposition of dead matter to release the nutrients back to be re-used by the autotrophs

Food chain in aquatic ecosystem (lake)

Phytoplanktons → Zooplanktons → Small fish → Big fish

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