{"thcode":2,"term":{"code":903,"name":"plankton","parent":841,"scope":"Floating aquatic plants (phytoplankton) and animals (zooplankton) which are often microscopic and drift with the current in lakes, rivers, and oceans."},"uf":[{"name":"planktonic ecosystems","usewith":{"code":54,"name":"aquatic ecosystems","parent":319,"scope":"Communities of interdependent organisms living primarily in or on water."}},{"name":"zooplankton","usewith":false}],"bt":[{"code":841,"name":"organism groupings (non-taxonomic)","parent":1174,"scope":"Used for categories of living organisms that are not taxonomic and that include species from more than one taxonomic group."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[{"code":1372,"name":"phytoplankton","parent":903,"scope":"Small, mostly microscopic aquatic plants such as algae and bacteria suspended in water."}],"rt":[{"code":53,"name":"aquatic biology","parent":650,"scope":"The scientific study of organisms living in or near water.  This term is to be used for the science of 'aquatic biology' and for  biological studies in fresh and brackish water. For marine biological studies, use 'marine biology'."},{"code":138,"name":"calcareous nannoplankton","parent":29,"scope":"Organisms of the kingdom Protista that normally produce coccoliths, microscopic structures of calcite (calcium carbonate), during some phase of their life cycle."},{"code":735,"name":"microbiology","parent":650,"scope":"Branch of biology dealing with organisms too small to be seen without the use of a microscope."},{"code":890,"name":"phycology","parent":127,"scope":"Branch of biology concerned with the study of algae."}]}