{"thcode":2,"term":{"code":419,"name":"freshwater ecosystems","parent":54,"scope":"Biological communities and habitats that exist in lakes, rivers, ponds, and other bodies of water that are not salty."},"uf":[{"name":"lake ecosystems","usewith":false},{"name":"pond ecosystems","usewith":false},{"name":"river ecosystems","usewith":{"code":1002,"name":"river systems","parent":1124,"scope":"Long water courses including main streams and tributaries."}},{"name":"spring ecosystems","usewith":false},{"name":"stream ecosystems","usewith":false}],"bt":[{"code":54,"name":"aquatic ecosystems","parent":319,"scope":"Communities of interdependent organisms living primarily in or on water."},{"code":319,"name":"ecosystems","parent":921,"scope":"The interacting populations of plants, animals, and  microorganisms occupying a certain area, and their relationship to the environment."},{"code":921,"name":"population and community ecology","parent":1174,"scope":"Interactions of a single species (population) or an association of different species (community) occupying a particular region, including their biotic and abiotic environments."},{"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":[],"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":311,"name":"ecology","parent":650,"scope":"Study of the relations between living plants and animals and their environment."},{"code":513,"name":"groundwater","parent":1308,"scope":"All water that exists beneath the land surface, but more commonly applied to water in fully saturated soils and geologic formations."},{"code":657,"name":"limnology","parent":291,"scope":"Scientific study of the physical and biological characteristics of inland bodies of water such as lakes and ponds."},{"code":1124,"name":"surface water (non-marine)","parent":1308,"scope":"Open bodies of water, such as lakes, rivers, or streams.  All non-marine waters on the  surface of the earth, including fresh, brackish, and salt water."}]}