PhytoplanktonDefinition (http://en.wikipedia.org/wiki/Phytoplankton) Phytoplankton are photosynthesizing microscopic organisms that inhabit the upper sunlit layer of almost all oceans and bodies of fresh water. They are agents for "primary production," the creation of organic compounds from carbon dioxide dissolved in the water, a process that sustains the aquatic food web. Phytoplankton obtain energy through the process of photosynthesis and must therefore live in the well-lit surface layer (termed the euphotic zone) of an ocean, sea, lake, or other body of water. (Wikipedia) Preferred Units: N/A Scope Note: N/A This term is used for the following terms: Phytoplankton communities
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