{"thcode":2,"term":{"code":88,"name":"bioaccumulation","parent":310,"scope":"The biological sequestering of a substance at a higher concentration than that at which it occurs in the surrounding environment or medium.  Also, the process whereby a substance enters an organism through the gills, epithelial tissues, dietary, or other sources."},"uf":[{"name":"bioconcentration","usewith":false}],"bt":[{"code":310,"name":"ecological processes","parent":101,"scope":"Dynamic biogeochemical interactions that occur among and between biotic and abiotic components of the biosphere."},{"code":101,"name":"biological and physical processes","parent":1174,"scope":"All continuing activities, functions, and phenomena associated with organisms and non-living matter."},{"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":311,"name":"ecology","parent":650,"scope":"Study of the relations between living plants and animals and their environment."},{"code":320,"name":"ecotoxicology","parent":650,"scope":"Scientific study of causes, dispersal, and effects of contaminants on the environment."},{"code":2269,"name":"microplastic contamination","parent":769,"scope":"Plastic particles less than 5 millimeters in diameter that come from a wide variety of sources, found in a variety of forms, including fibers, pellets\/beads, foams, films, fragments, and tire particles, and reach aquatic environments through diverse pathways."}]}