Farah Abi-Akar (MDE) - Maryland Department of Natural Resources ...

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Example: Seneca Creek, Impervious Surface Cases Controls Stressor above Stressor below 6 4 9 163 Odds Ratio ≈ ad bc ≈ 6*163 9*4 ≈ 27 6 9 Attributable Risk ≈ % cases - % controls ≈ - ≈ 55% 10 172 Therefore: • Yes, impervious surface is a possible bio stressor in Seneca Creek. • Estimated risk attributable to impervious surface: 55%
Group Stressor AR Sources - Agr High % of agriculture in watershed 29% 29% 96% Sources - Low % of forest in watershed 45% 47% Anthropogenic Low % of forest in 60m buffer 18% Sources - Urban High % of impervious surface in 60m buffer 49% 59% High % of impervious surface in watershed 55% High % of high-intensity developed in watershed 38% High % of low-intensity developed in watershed 57% High % of medium-intensity developed in watershed 58% High % of early-stage residential in watershed 44% High % of residential developed in watershed 57% High % of roads in watershed 52% High % of high-intensity developed in 60m buffer 19% High % of low-intensity developed in 60m buffer 55% High % of medium-intensity developed in 60m buffer 49% High % of early-stage residential in 60m buffer 25% High % of residential developed in 60m buffer 58% High % of roads in 60m buffer 10% Sediment Epifaunal substrate poor 18% 18% 96% Instream Habitat Concrete/gabion present 18% 48% Instream habitat structure poor 10% Riffle/run quality marginal to poor 28% Water Chemistry High chlorides 34% 76% High conductivity 62% High orthophosphate 22% High lab pH 18% High total nitrogen 54%
Page 1 and 2: Biological Stressor Identification
Page 3 and 4: Background
Page 5 and 6: Background • MD Water Quality Sta
Page 7 and 8: Background • WQS not met Watersh
Page 9 and 10: How the BSID works
Page 11 and 12: Data • DNR’s Maryland Biologica
Page 13 and 14: Goal: Compare Bio to Stressors •
Page 15 and 16: Goal: Compare Bio to Stressors Cont
Page 17 and 18: Goal: Compare Bio to Stressors 2. S
Page 19 and 20: Goal: Compare Bio to Stressors Stre
Page 21 and 22: Goal: Compare Bio to Stressors Stre
Page 23 and 24: 1. Do these overlap Yes they are n
Page 25 and 26: Goal: Compare Bio to Stressors
Page 27 and 28: Goal: Compare Bio to Stressors •
Page 29 and 30: Thanks to odds ratios, probable str
Page 31 and 32: Attributable Risk • ARs are also
Page 33: Stressor above Cases 6 Controls 9 E
Page 37 and 38: # Watersheds Impacted per Stressor
Page 39 and 40: BSID Output • Watershed-specific
Page 41 and 42: What’s next • Analysis of resul

Farah Abi-Akar (MDE) - Maryland Department of Natural Resources ...

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