What defines planktonic algae?

Planktonic algae are characterized as single-celled organisms or small colonies that float freely in the water column. This definition highlights their ability to drift with water currents rather than being anchored to a substrate, distinguishing them from other algae types that may be sessile or attached to surfaces. Planktonic algae play a crucial role in aquatic ecosystems, serving as a primary food source for various aquatic organisms and contributing to the overall productivity of these environments through photosynthesis. Understanding their characteristics is vital in aquatic management and ecological studies.