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Exposure and Effects Pilot Study Small Fish Mercury Project

Exposure and Effects Pilot Study Small Fish Mercury Project. Ben Greenfield 1 , Letitia Grenier 1 , Andrew Jahn 2 , Seth Shonkoff 1 , Mark Sandheinrich 3 , Joy Andrews 4 , Jay Davis 1

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Exposure and Effects Pilot Study Small Fish Mercury Project

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  1. Exposure and Effects Pilot Study Small Fish Mercury Project Ben Greenfield1, Letitia Grenier1, Andrew Jahn2, Seth Shonkoff1, Mark Sandheinrich3, Joy Andrews4, Jay Davis1 1. SFEI; 2. 1000 Riverside Drive, Ukiah, CA; 3. River Studies Center, University of Wisconsin – La Crosse; 4. California State University – East Bay

  2. EEPS ― Small Fish Hg Project • Goals • Characterize food-web mercury at finer spatial and temporal scales than sport fish studies • Detect regional trends in bioaccumulation of Hg related to wetland restoration • Identify differences in pattern between benthic and pelagic food webs

  3. EEPS ― Small Fish Hg Project • Design • 8 sites from South Bay to Suisun Bay • 4 sites near restoration projects • 4 index sites near extant marshes • Additional samples in deep water • Sample benthic and pelagic species at each site • Use related types of species to create data sets comparable across a wide range of salinities • Topsmelt/Mississippi (inland) silversides (Atherinopsidae) • Arrow goby, cheekspot, and Shimofuri goby (Tridentiger) • Bay goby from deep water

  4. EEPS ― Small Fish Hg Project • Design • Four composites per species per site - allow statistical comparison • 5-10 individuals/composite • Minimize covariates by using consistent sizes

  5. EEPS ― Small Fish Hg Project • Collaboration and leverage • Analytical lab - UW LaCrosse River Studies Center • Additional samples for individual Hg analysis by CSU - East Bay (Joy Andrews) • Extra samples collected using clean techniques for trace organics analysis • Looking for funding for analysis • Bay Gobies from IEP trawl surveys

  6. EEPS ― Small Fish Hg Project • Coordination with other monitoring • Geographic • EEPS samples bay edge - South, Central and North Bay • South Bay Salt Pond Hg project samples inside marshes, ponds, and sloughs • CBDA Fish Mercury Project - North Bay, more freshwater focus • Species • Intent to produce data set as comparable as possible across region

  7. EEPS ― Small Fish Hg Project 3

  8. EEPS ― Small Fish Hg Project Treatment Reference Bay Goby

  9. Preliminary Results • 72 Composite samples analyzed • Data received last week • QA was good • 94% recovery of spiked samples • 5% relative standard deviation of triplicate samples

  10. Pelagic Species Higher

  11. Spatial Patterns Benicia Park China Camp Oakland Middle Harbor Eden Landing Bird Island Newark Slough Alviso Slough

  12. Comparison to Fish/WildlifeRisk Thresholds * Tissue concentration dry weight

  13. Summary • Variation among species • Mississippi Silverside > Topsmelt > Arrow/Cheekspot Gobies > Bay Goby • Variation among stations • Alviso Slough generally elevated • Southern stations elevated in silversides (Alviso, Newark, Bird Island)

  14. Future Steps • Evaluate species selection • Are we on the right track with chosen species? • Evaluate sample sizes and study design • Power analysis • Estimate wildlife risk • Long-term trend evaluation

  15. Thanks to… April Robinson Bridget Mooney Cindy Patty Darell Slotten Marco Sigala Dave Crane Sarah Cohen Meg Sedlak Joel Baker Arthur Fong SF Bay National Wildife Refuge California State Parks CA Department Fish & Game

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