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The RMP Mercury Strategy: Studies Underway

This presentation discusses the ongoing studies and research conducted as part of the RMP Mercury Strategy, focusing on the entry points, accumulation processes, and management interventions for mercury in the food web.

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The RMP Mercury Strategy: Studies Underway

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  1. The RMP Mercury Strategy: Studies Underway

  2. Talk Presents Multiple Data Sets Katie Harrold, Aroon Melwani, Andy Jahn, Jay Davis, John Oram, Shira Bezalel, Jen Hunt, Sarah Lowe, Karen Taberski Regional Monitoring Program Joel Blum, Gretchen Gehrke University of Michigan Holger Hintelmann, Brian Dimock Trent University Mark Marvin-DiPasquale, David Krabbenhoft, Collin Eagles-Smith, Josh Ackerman US Geological Survey Mark Stephenson, Wes Heim Moss Landing Marine Laboratories Darell Slotton, Shaun Ayers University of California - Davis

  3. What is being done to answer the questions in the Mercury Strategy?

  4. Answering the Mercury Strategy Questions Question 1: Where is mercury entering the food web? • RMP Studies • Small Fish • Sport Fish • Avian Eggs • Sediment • Water • Other Studies • South Baylands Mercury Project

  5. Answering the Mercury Strategy Questions Question 2: Which processes, sources, and pathways contribute disproportionately to food web accumulation? • RMP Studies • Methylmercury Model • DGTs • Mercury Isotopes • Small fish • Other Studies • WERF • Effluent Monitoring

  6. Answering the Mercury Strategy Questions Question 3: What are the best opportunities for management intervention for the most important pollutant sources, pathways, and processes? • Other Studies • Prop 13: Control Options in Tidal Wetlands • Props 40/50: Control Options in Suisun Marsh • Prop 13: Urban stormwater BMPs • RMP Studies • Methylmercury Model Development

  7. Answering the Mercury Strategy Questions Question 1: Where is mercury entering the food web?

  8. MeHg in sediments – probabilistic stations

  9. Mississippi silverside

  10. Topsmelt

  11. White sturgeon

  12. Sediments - RMP and other studies Open Enclosed

  13. Sediments - RMP and other studies • Nearshore and enclosed sites higher Open Enclosed

  14. Small fish also show nearshore/offshore pattern Wetland/margin species Open water species

  15. Sediment

  16. What do available data suggest? Question 1: Where is mercury entering the food web? • Southern parts of Estuary • South Bay Salt Ponds • Nearshore areas • Enclosed areas • Marsh sloughs and vegetated marsh (sediments)

  17. Answering the Mercury Strategy Questions Question 2: Which processes, sources, and pathways contribute disproportionately to food web accumulation?

  18. Expanded small fish • What kinds of sites are higher in fish Hg • Stratified probabilistic sampling • Sampling 108 unique locations

  19. What kinds of sites are higher in fish Hg • Wetlands?

  20. What kinds of sites are higher in fish Hg • Wetlands? • Enclosed sloughs?

  21. What kinds of sites are higher in fish Hg • Wetlands? • Enclosed sloughs? • Industrial watershed drainages?

  22. What kinds of sites are higher in fish Hg • Wetlands? • Enclosed sloughs? • Industrial watershed drainages? • WWTPs?

  23. What kinds of sites are higher in fish Hg • Wetlands? • Enclosed sloughs? • Industrial watershed drainages? • WWTPs? • Contaminated sediments

  24. What kinds of sites are higher in fish Hg • Wetlands? • Enclosed sloughs? • Industrial watershed drainages? • WWTPs? • Contaminated sediments • Hg mine drainages?

  25. What kinds of sites are higher in fish Hg • Wetlands? • Enclosed sloughs? • Industrial watershed drainages? • WWTPs? • Contaminated sediments • Hg mine drainages? • Compare to ambient bay and long term sites

  26. DGT = Diffusive Gradient in Thinfilm • Surrogate for biotic MeHg exposure • Integrates water or sediments longer duration than grab samples

  27. DGTs in the field

  28. Can be placed in any aquatic location

  29. Goals of the San Francisco Bay Hg Isotope Study Determine the Hg isotopic composition of Bedrock Mine tailings Gold mining Hg from bedrock in the drainage basin • Hg from Hg mine tailings • Hg from placer Au mining • Urban run-off • Municipal waste water • Atmospheric deposition • Determine the spatial distribution of Hg isotopic compositions in Bay sediments (at least 9 sites) to investigate sources of Hg in sediments • Determine the Hg isotopic compositions of fish from the same sites to investigate sources of Hg to fish

  30. Answering the Mercury Strategy Questions Question 3: What are the best opportunities for management intervention for the most important pollutant sources, pathways, and processes?

  31. Acknowledgements Katie Harrold, Aroon Melwani, Andy Jahn, Jay Davis, John Oram, Shira Bezalel, Jen Hunt, Sarah Lowe, Karen Taberski Regional Monitoring Program Joel Blum, Gretchen Gehrke University of Michigan Holger Hintelmann, Brian Dimock Trent University Mark Marvin-DiPasquale, David Krabbenhoft, Collin Eagles-Smith, Josh Ackerman US Geological Survey Mark Stephenson, Wes Heim Moss Landing Marine Laboratories Darell Slotton, Shaun Ayers University of California - Davis

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