An official website of the United States government.

We've made some changes to If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

EPA EcoBox

EPA EcoBox Tools by Receptors

A receptor is defined as the ecological entity exposed to the stressor. This term may refer to plants and animals (including endangered and threatened species), habitats, or ecosystems. “Ecological component” (U.S. EPA, 1992) is an alternative term used; however, “receptor” is usually clearer in discussions of exposure where the emphasis is on the stressor-receptor relationship (U.S. EPA, 1998). This tool set is presented as 4 modules:


See information and tools related to biota


Endangered SpeciesEndangered Species

See information and tools related to endangered species


Habitat and EcosystemsHabitats and Ecosystems

See information and tools related to habitats and ecosystems