1. Land use and nutrient patterns in upstream watersheds of St. Martin River Kris Beckert, Thomas Fisher, Roman Jesien, Ben Fertig, Judy O’Neil, Tim Carruthers, Bill Dennison

2. Methods Monthly nutrient data obtained for 6 streams in St. Martin River watershed July 2006-Jan 2008 Aerial photography used to re-draw land use polygons in GIS Land use calculation for stream sub-watersheds in St. Martin River region USGS average monthly discharge data for Birch Branch at Showell July 2006- Sept 2007 Total Nitrogen and Total Phosphorus yearly loading Regression analysis of land use vs. Dec-March nutrient concentrations

3. St. Martin River 2005 Aerial Photography

5. Correction of Land Use Polygons 2002 land use files obtained from Maryland Department of Planning Overestimation of land use, especially feeding operations Polygons re-drawn closer to aerial imagery Initial Feeding Operations Polygon

6. Correction of Land Use Polygons 2002 land use files obtained from Maryland Department of Planning Overestimation of land use, especially feeding operations Polygons re-drawn closer to aerial imagery New Feeding Operations Polygon Forest

7. Stream Sites B8 B6 B5 B3 B2 B1 USGS gage

8. B1: Dam Watershed area (ha) 3056 N load (y -1 )30,970 Average TNha -1 yr -1 10.14 P load (y -1 )1,325 Average TPha -1 yr -1 0.43

9. B2: Slab Bridge at Hotel Rd. Watershed area (ha) 131 N load (y -1 )1,455 Average TNha -1 yr -1 12.79 P load (y -1 )47 Average TPha -1 yr -1 0.36

10. B3: Carey Branch at Hotel Rd Watershed area (ha) 1,593 N load (y -1 )14,643 Average TNha -1 yr -1 9.20 P load (y -1 )601 Average TPha -1 yr -1 0.38

11. B5: Bunting Branch at Rt. 54 Watershed area (ha) 907 N load (y -1 )11,537 Average TNha -1 yr -1 12.71 P load (y -1 )316 Average TPha -1 yr -1 0.35

12. B6: Unnamed Tributary Watershed area (ha) 133 N load (y -1 )2,623 Average TNha -1 yr -1 19.67*** P load (y -1 )46 Average TPha -1 yr -1 0.35* *Lowest observed value ***Highest observed value

13. B8: Church Branch Watershed area (ha) 1284 N load (y -1 )11,585 Average TNha -1 yr -1 9.02* P load (y -1 )588 Average TPha -1 yr -1 0.46*** *Lowest observed value ***Highest observed value

14. Regressions: Nitrogen vs. Anthropogenic land use

15. Regressions: Phosphorus vs. Anthropogenic land use

16. Regressions: Nitrogen vs. Feeding Operations

17. Regressions: Phosphorus vs. Feeding Operations

18. Regressions: Nitrogen vs. Natural

19. Regressions: Phosphorus vs. Natural