... relative risks per subarea to the aquatic fauna are presented in Figure 9.8and Figure 9.9. The Betari catchment area (B) has a greater risk of being adversely 184 REGIONAL SCALE ECOLOGICAL RISK ASSESSMENT ... stressor–response relationships for prospective risk analysis, Environ. Toxicol. Chem ., 19, 1106–1112.Graham, R. et al. 1991. Ecological risk assessment at the regional scale, Ecol. Appl ., 1, 196–206.Hartwell, ... used for a wide range of sub-stances with distinct toxicological properties. Additionally, the study was forced torely on out-of-date maps. Gathering site-specific, up-to-date data can reduce thiskind...