Phytoplankton is primarily consumed by zooplankton, small fish, and crustaceans. These in turn are consumed by fish, small sharks, corals, and baleen whales.
They also provide an essential ecological function for all aquatic life.
For more relevant articles refer to the links given below:
- UPSC Environment and Ecology Questions
- International Union for Conservation of Nature (IUCN)
- UPSC Environment and Ecology