draft data - do not cite or quote spatial and temporal patterns in food web accumulation of hg...
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![Page 1: Draft data - do not cite or quote Spatial and temporal patterns in food web accumulation of Hg Project Update RMP Exposure and Effects Work Group May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,](https://reader038.vdocument.in/reader038/viewer/2022102814/5514da4855034693478b5424/html5/thumbnails/1.jpg)
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Spatial and temporal patterns in food web accumulation of Hg
Project UpdateRMP Exposure and Effects Work Group
May 12, 2008
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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?
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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
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Allocation of effort
• Total of 62 sampling events per year to evaluate spatial, seasonal, and interannual patterns
Type Sites
Events per
Year
Total Events
per Year
Total EventsOver 3 Years
% Sampling Budget
Spatial 36 1 36 108 73%
Interannual 8 1 8 24 17%
Seasonal 2 9 18 54 10%
62 186
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Spatial survey design - hypothesis testing
Hydrology:Site Type
Open Shoreline
Enclosed Total Number
High Hg Wetland NA NA 6/yr
Low Hg Wetland NA NA 6/yr
Hg Source Area 6/yr 6/yr 12/yr
Other 6/yr 6/yr 12/yr
Total number sites 36/yr
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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
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How separating different site types?
Hydrology:Site Type
Open Shoreline
Enclosed Total Number
High Hg Wetland NA NA 6/yr
Low Hg Wetland NA NA 6/yr
Hg Source Area 6/yr 6/yr 12/yr
Other 6/yr 6/yr 12/yr
Total number sites 36/yr
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Map of areas to be sampled
GIS based on morphology, size, depth
-Strata 1:Open Shorelines-Strata 2:Enclosed areas and creeks
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Identifying Hg source areas
Hydrology:Site Type
Open Shoreline
Enclosed Total Number
High Hg Wetland NA NA 6/yr
Low Hg Wetland NA NA 6/yr
Hg Source Area 6/yr 6/yr 12/yr
Other 6/yr 6/yr 12/yr
Total number sites 36/yr
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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
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Hydrology:Site Type
Open Water Embayment Total Number
High Hg Wetland NA NA 6/yr
Low Hg Wetland NA NA 6/yr
Hg Source Area 6/yr 6/yr 12/yr
Other 6/yr 6/yr 12/yr
Total number sites 36/yr
Wetland site selection
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•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
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Results of site selection
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Non-wetland site selectionYears 1 - 3
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Wetland site selectionYears 1-3
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Source site selectionYears 1-3
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All sitesYear One
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Source SitesYear One
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Enclosed vs.Open shorelineYear One
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All sitesYear Two(does not include wetlands)
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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
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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
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Discussion points• How select sites for DGT and Hg
isotope in year one
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END OF TALK
• REST IS ANCILLARY MATERIAL IN EVENT OF DISCUSSION
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THg (ng/g)10 100 1000 10000
MeH
g (n
g/g)
0.01
0.1
1
10
Land Within 2 Km Buffer0.0 0.2 0.4 0.6 0.8 1.0
TOC (%)0.1 1 10
Latitude (Degrees N)37.4 37.6 37.8 38.0 38.2
MeH
g (n
g/g)
0.01
0.1
1
10
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Sediment MeHg may be correlated with topsmelt Hg
0.5 1.0 1.5 2.0 2.53.03.5
MeHg in sediment (ng/g)
0.02
0.03
0.04
0.05
0.06
0.070.08
Hg
in f
ish
(u
g/g
)
•Topsmelt 2006 data
•RMP and Calfed sediment data within 1.5 km disk of fish
•R2 = 0.61
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Trend analysis – a multiple station BACI design
0
0.05
0.1
0.15
0.2
0.25
0.3
1 2 3 4 5 6 7 8 9
Year
Mer
cury
Con
cent
ratio
ns Control 1
Impact 1
Control 2
Impact 2
Control 3
Impact 3
Control 4
Impact 4
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Trend Sampling Locations
Alviso Slough
Newark Slough
Bird Island/Steinberger Slough
Eden Landing
China Camp
Benicia Park
Control
Impact (Restoration)Point Isabel
CandlestickPoint
Hamilton
Oakland Middle Harbor
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Trend Sampling Locations
Alviso Slough
Newark Slough
Bird Island/Steinberger Slough
Eden Landing
China Camp
Benicia Park
Control
Impact (Restoration)Point Isabel
CandlestickPoint
Hamilton
Oakland Middle Harbor
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Monthly sampling locations
Martin Luther King Shoreline
Additional North Bay Station Sampled by USFWS
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MLK Shoreline Location
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Collection of additional parameters
• Aimed at better understanding mechanisms for spatial variation in bioavailable Hg
• GIS spatial parameters
• Sediment parameters
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Sediment parameters
• Sediment parameters: redox, TON, grain size, total and methyl Hg
• Samples at subset of 20 Sites
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-122.6 -122.3 -122.0 -121.7Longitude
37.4
37.5
37.6
37.7
37.8
37.9
38.0
38.1
38.2La
titud
e
-3-2-1012
LOGMEHG
0.00.51.01.52.02.5
MEHG_HIGH1
Sediment MeHg: < 1 ng/g 1 – 2 ng/g > 2 ng/g
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Annual monitoring of trend stations
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0.5 1.0 1.5 2.0 2.53.03.5
SEDIMENT
0.02
0.03
0.04
0.05
0.06
0.070.08
FIS
H
SQ
Pt Isabel
Tiburon
Alviso
Newark
Oakland Harb
Treasure Isl
China Camp