Answer :
Because light is required for photosynthesis, phytoplankton and other primary producers are restricted to the ocean's uppermost layers, where light is abundant sufficiently to sustain the reaction.
What is aquatic ecosystem?
Oceans, lakes, rivers, streams, estuaries, and wetlands are all examples of aquatic ecosystems. Aquatic ecosystems contain living things that rely on water for survival, such as fish, plants, and microorganisms.
Increased light, while generally beneficial to primary production, is not always beneficial to aquatic organisms.
UV-A and UV-B radiation can damage genetic material, acting as a stressor by putting intracellular repair mechanisms under strain.
Thus, this way, wavelengths of light are absorbed differently in aquatic ecosystems and how this pattern influences primary productivity.
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