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Draft data - do not cite or quote Spatial and temporal patterns in food web accumulation of Hg Project Update RMP Exposure and Effects Work Group May 12,

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Presentation on theme: "Draft data - do not cite or quote Spatial and temporal patterns in food web accumulation of Hg Project Update RMP Exposure and Effects Work Group May 12,"— Presentation transcript:

1 Draft data - do not cite or quote Spatial and temporal patterns in food web accumulation of Hg Project Update RMP Exposure and Effects Work Group May 12, 2008

2 Draft data - do not cite or quote Workplan: Specific questions to address 1.Where is mercury entering the Bay food web? 2.What habitats, conditions, or factors help to identify hotspots of food web accumulation in Bay margins? 3.Are there interannual trends in MeHg bioaccumulation resulting from wetland and margin restoration activities? 4.What are the best biomonitoring tools for characterizing hotspots of MeHg bioaccumulation?

3 Draft data - do not cite or quote General approach Spatial analysis –Stratified random design –Identify hotspots based on conceptual model Seasonal trend evaluation Interannual trend detection Field sampling for Hg isotopes and for DGT study

4 Draft data - do not cite or quote Allocation of effort Total of 62 sampling events per year to evaluate spatial, seasonal, and interannual patterns TypeSites Events per Year Total Events per Year Total Events Over 3 Years % Sampling Budget Spatial361 10873% Interannual8182417% Seasonal29185410% 62186

5 Spatial survey design - hypothesis testing Hydrology: Site Type Open Shoreline EnclosedTotal Number High Hg WetlandNA 6/yr Low Hg WetlandNA 6/yr Hg Source Area6/yr 12/yr Other6/yr 12/yr Total number sites36/yr Draft data – do not cite or quote

6 Spatial survey sites chosen probabilistically Same GRTS method as Status and Trends Program What types of conditions Bay-wide higher Hg Stratified sampling scheme Even if all our hypotheses are wrong, we are still characterizing conditions and identifying hotspots Bay-wide Draft data – do not cite or quote

7 Draft data - do not cite or quote How separating different site types? Hydrology: Site Type Open Shoreline EnclosedTotal Number High Hg WetlandNA 6/yr Low Hg WetlandNA 6/yr Hg Source Area6/yr 12/yr Other6/yr 12/yr Total number sites36/yr

8 Map of areas to be sampled GIS based on morphology, size, depth -Strata 1: Open Shorelines -Strata 2: Enclosed areas and creeks Draft data – do not cite or quote

9 Draft data - do not cite or quote Identifying Hg source areas Hydrology: Site Type Open Shoreline EnclosedTotal Number High Hg WetlandNA 6/yr Low Hg WetlandNA 6/yr Hg Source Area6/yr 12/yr Other6/yr 12/yr Total number sites36/yr

10 Draft data - do not cite or quote Source site selection Mining sources –Creeks draining probable source mines POTW discharges –Feedback from RB NPDES Permitting Staff Creeks draining urban/industrial areas –Feedback from BASMAA Industrial areas with high sediment THg Total of about 50 sites

11 Draft data - do not cite or quote Hydrology: Site Type Open WaterEmbaymentTotal Number High Hg WetlandNA 6/yr Low Hg WetlandNA 6/yr Hg Source Area6/yr 12/yr Other6/yr 12/yr Total number sites36/yr Wetland site selection

12 Oversight by Josh Collins and Letitia Grenier Based on GRTS sampling performed for SBMP and CRAM Stratified based on: relative wetland elevation and age Is wetland hypothesized to be high or low in bioavailable Hg Wetland site selection Draft data – do not cite or quote

13 Draft data - do not cite or quote Results of site selection

14 Non-wetland site selection Years 1 - 3 Draft data – do not cite or quote

15 Wetland site selection Years 1-3 Draft data – do not cite or quote

16 Source site selection Years 1-3 Draft data – do not cite or quote

17 All sites Year One Draft data – do not cite or quote

18 Source Sites Year One Draft data – do not cite or quote

19 Enclosed vs. Open shoreline Year One Draft data – do not cite or quote

20 All sites Year Two (does not include wetlands) Draft data – do not cite or quote

21 Draft data - do not cite or quote Coordination and Collaboration University of Michigan – RMP Hg stable isotope study (Joel Blum, Gretchen Gehrke) –Hg isotope sites characterize specific sources Urban runoff, mining, waste water, atmospheric deposition Sites will be chosen from small fish source sites after probabilistic site selection is complete Sediment Hg and isotope analysis

22 Draft data - do not cite or quote Coordination and Collaboration Trent University – Diffusive Gradient in Thinfilm devices (Holger Hintelmann) –Just completing analyses of the pilot study data (2007) –Year 1 - validation 15 small fish sites varying in chemistry and expected bioaccumulation Will overlap with mercury isotope sites –Year 2 – process studies Source sites of interest including fishless locations Gradient studies Likely include SPL sites (e.g., Z4LA) Report available February 2010 –Addition of water column DOC as correlate

23 Draft data - do not cite or quote Discussion points How select sites for DGT and Hg isotope in year one

24 Draft data - do not cite or quote END OF TALK REST IS ANCILLARY MATERIAL IN EVENT OF DISCUSSION

25 Draft data – do not cite or quote

26 Draft data - do not cite or quote Draft data – do not cite or quote

27 Draft data - do not cite or quote Sediment MeHg may be correlated with topsmelt Hg Topsmelt 2006 data RMP and Calfed sediment data within 1.5 km disk of fish R 2 = 0.61

28 Trend analysis – a multiple station BACI design Draft data – do not cite or quote

29 Trend Sampling Locations Alviso Slough Newark Slough Bird Island/ Steinberger Slough Eden Landing China Camp Benicia Park Control Impact (Restoration) Point Isabel Candlestick Point Hamilton Oakland Middle Harbor Draft data – do not cite or quote

30 Trend Sampling Locations Alviso Slough Newark Slough Bird Island/ Steinberger Slough Eden Landing China Camp Benicia Park Control Impact (Restoration) Point Isabel Candlestick Point Hamilton Oakland Middle Harbor Draft data – do not cite or quote

31 Monthly sampling locations Martin Luther King Shoreline Additional North Bay Station Sampled by USFWS Draft data – do not cite or quote

32 MLK Shoreline Location Draft data – do not cite or quote

33 Draft data - do not cite or quote Collection of additional parameters Aimed at better understanding mechanisms for spatial variation in bioavailable Hg GIS spatial parameters Sediment parameters

34 Draft data - do not cite or quote Sediment parameters Sediment parameters: redox, TON, grain size, total and methyl Hg Samples at subset of 20 Sites

35 Draft data - do not cite or quote Sediment MeHg: < 1 ng/g 1 – 2 ng/g > 2 ng/g

36 Annual monitoring of trend stations

37 Draft data - do not cite or quote

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