What are planktonic algae?

Planktonic algae are indeed characterized as single-celled or small colonies that float freely in the water. This means they are not attached to any substrate and can move with the water currents. They play a crucial role in aquatic ecosystems as primary producers, utilizing sunlight for photosynthesis to produce oxygen and organic materials that serve as food for other aquatic organisms.

In contrast to planktonic algae, multi-celled organisms that grow attached to surfaces contribute to benthic ecosystems and are important in different ecological roles. Large, rooted plants are distinctly different from planktonic algae, as they are anchored to the substrate and have structures designed for water and nutrient uptake. Microorganisms that survive exclusively in saltwater do not encompass the full diversity of planktonic algae, which can be found in both freshwater and marine environments. Understanding these distinctions helps clarify the unique characteristics and ecological significance of planktonic algae in aquatic systems.