| Abstract from DBPedia | Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a crucial source of food to many small and large aquatic organisms, such as bivalves, fish and whales. Marine plankton include bacteria, archaea, algae, protozoa and drifting or floating animals that inhabit the saltwater of oceans and the brackish waters of estuaries. Freshwater plankton are similar to marine plankton, but are found in the freshwaters of lakes and rivers. 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. 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. Though many planktonic species are microscopic in size, plankton includes organisms over a wide range of sizes, including large organisms such as jellyfish. Plankton are defined by their ecological niche and level of motility rather than by any phylogenetic or taxonomic classification. Technically the term does not include organisms on the surface of the water, which are called neuston—or those that swim actively in the water, which are called nekton.プランクトン（Plankton、浮遊生物）とは、水中や水面といったを漂って生活する（）のうち、水流に逆えるに足る遊泳能力を持たない生物の総称である。様々な分類群に属する生物を含む。微小なものが多く、生態系において生態ピラミッドの下層を構成する重要なものである。例としてミジンコやミドリムシ、アオミドロなどが挙げられる。 (Source: http://dbpedia.org/resource/Plankton) |
