Respuesta :

Plant like Protists - also called algae - autotrophs 
Fungus like Protists - heterotrophs, decomposers, external digestion 

From the above their role in the aquatic food chain is clear . 

They perform their role as 
1) producers = example = Plant like Protists - also called algae - autotrophs 

2 ) consumers = example =Animal like Protists - also called protozoa (means "first animal") - heterotrophs 
and 
3) Decomosers = example ==Fungus like Protists - heterotrophs, decomposers, external digestion

Protists that play an important role in aquatic food webs are called protozoa.

All protozoans are single celled organism means made up of one cell. Protozoa is plant-like protists that are found in all aquatic habitats. Protozoa play a key role in maintaining the balance of ecosystems. These protozoa provides food to the other aquatic animals that are present in that ecosystem. Without these protozoans, the aquatic ecosystem can't survive due to no food availability.

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