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:

• Receptors in ERA

Biota

See information and tools related to biota


 

Endangered Species

See information and tools related to endangered species


 

Habitats and Ecosystems

See information and tools related to habitats and ecosystems