Sites were scored 1, 2, 3, or 4 (from 1, pristine, to 4, highly disturbed) in each of three stressor categories: local habitat modifications (i.e. riparian quality, presence of waste effluents, presence of weirs), landscape use intensity (i.e. urban, deforestation and/or agriculture obtained from land use maps) and mining activities (presence of effluents from mining activities)