![]() Plankton are defined by their ecological niche and level of motility rather than by any phylogenetic or taxonomic classification. Though many planktonic species are microscopic in size, plankton includes organisms over a wide range of sizes, including large organisms such as jellyfish. These include plant spores, pollen and wind-scattered seeds, as well as microorganisms swept into the air from terrestrial dust storms and oceanic plankton swept into the air by sea spray. ![]() Plankton are usually thought of as inhabiting water, but there are also airborne versions, the aeroplankton, that live part of their lives drifting in the atmosphere. ![]() Freshwater plankton are similar to marine plankton, but are found in the freshwaters of lakes and rivers. Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. The individual organisms constituting plankton are called plankters. Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind).
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