"Planktonic organisms" refers to tiny living creatures that float or drift in water and are unable to swim against the current. They include small plants called phytoplankton and small animals called zooplankton. Full definition
Over the weeks of residence, they also studied the fluctuations and migrations of planktonic organisms in the water column, still a focus of research today. (discovermagazine.com)
Previously, the ocean's numerous planktonic organisms have largely been uncharacterized. (aaas.org)
«Compared to other planktonic organisms, coccolithophores will find themselves in a disadvantage. (oceanacidification.de)