Why are protozoans know as the important link for aquatic food chain ?

Dear student 
Please find your answer below to the asked query 

Protozoans are found in large number in aquatic system like ocean. They stabilises the food chain and maintain an adequate level of energy in the food chain.
They eat and digest algae thereby decreasing the chance of Eutrophication.
(Eutrophication leads to increased nutrient content of the water body and causes excess growth of algae. This algal bloom covers the water surface, secrete toxins and reduce oxygen content of water). 
 Protozoans thus  act as a prime source for the completion of aquatic food chain.
 
For example: plankton is eaten by larger zooplankton and it is eaten by crustaceans.
Hence they are referred to as important connecting link for aquatic food chain. 

Regards 

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