Ecological risk assessment Environmental Management ecological relevance PopulatIon success Populatlon rlywarning structure Reproduction Time scale BioenergetIcs Grow th of response Years Phys lolo gIcal Months HIstopath Days/weeks Biochem ica Hours/days Blom olecular Minutes Sub-organ ismal Individual P。 pulation Environmental Stressors Hierarchial response of organisms to environmental stressors illustrating the more sensitive early warning indicators at the lower levels of biological organization and the slower-responding but more ecologically relevant indicators at the higher levels of organizationHierarchial response of organisms to environmental stressors illustrating the more sensitive early warning indicators at the lower levels of biological organization and the slower-responding but more ecologically relevant indicators at the higher levels of organization