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The RMP Mercury Strategy: Studies
Underway
![Page 2: The RMP Mercury Strategy: Studies Underway. Talk Presents Multiple Data Sets Katie Harrold, Aroon Melwani, Andy Jahn, Jay Davis, John Oram, Shira Bezalel,](https://reader030.vdocuments.net/reader030/viewer/2022032805/56649eef5503460f94bff9d6/html5/thumbnails/2.jpg)
Talk Presents Multiple Data SetsKatie Harrold, Aroon Melwani, Andy Jahn, Jay Davis, John Oram, Shira Bezalel, Jen Hunt, Sarah Lowe, Karen TaberskiRegional Monitoring Program
Joel Blum, Gretchen Gehrke University of Michigan
Holger Hintelmann, Brian DimockTrent University
Mark Marvin-DiPasquale, David Krabbenhoft, Collin Eagles-Smith, Josh AckermanUS Geological Survey
Mark Stephenson, Wes HeimMoss Landing Marine Laboratories
Darell Slotton, Shaun AyersUniversity of California - Davis
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What is being done to answer the questions in the Mercury Strategy?
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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
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Answering the Mercury Strategy Questions Question 2: Which processes, sources, and
pathways contribute disproportionately to food web accumulation?
• RMP Studies– Methylmercur
y Model – DGTs– Mercury
Isotopes– Small fish
• Other Studies– WERF– Effluent
Monitoring
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Answering the Mercury Strategy Questions Question 3: What are the best opportunities for
management intervention for the most important pollutant sources, pathways, and processes?
• RMP Studies– Methylmercury
Model Development
• Other Studies– Prop 13:
Control Options in Tidal Wetlands
– Props 40/50: Control Options in Suisun Marsh
– Prop 13: Urban stormwater BMPs
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Answering the Mercury Strategy Questions
Question 1: Where is mercury entering the food web?
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Coyot
e Ck
Redwoo
d Ck
Yerba
Bue
na Is
Pinole
Pt
Grizzly
Bay
Sacra
men
to R
San Jo
aquin
R
Me
thyl
me
rcu
ry (
ng
g-1
)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Se
dim
en
t
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MeHg in sediments – probabilistic stations
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Mississippisilverside
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0.00 0.05 0.10 0.15 0.20 0.25 0.30
Benicia State ParkSan Quentin
Paradise BeachBerkeley Frontage
TiburonTreasure Island
Point IsabelOakland Middle Harbor
Candlestick ParkEden Landing
Newark SloughBird Island
Alviso SloughPond A16Pond A13Pond A12
Pond A5Pond A2W
Pond A1
San Francisco Bay
South Bay Salt Ponds
Mercury (g g-1 wet weight)
Topsmelt
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White sturgeon
Mer
cury
Con
cent
ratio
n (p
pm)
0.0
0.2
0.4
0.6
0.8
1.0
So
uth
Ba
y
Sa
n P
ablo
Ba
y
So
uth
Ba
y
So
uth
Ba
y
So
uth
Ba
y
Sa
n P
ablo
Ba
y
Sa
n P
ablo
Ba
y
Sa
n P
ablo
Ba
y
1997 2000 2003 2006
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Sediments - RMP and other studies
Land Within 2 Km Buffer0.0 0.2 0.4 0.6 0.8 1.0
0.01
0.1
1
10
THg (ng g-1
)10 100 1000 10000
MeH
g (n
g g-1
)
0.01
0.1
1
10
TOC (%)0.1 1 10
0.01
0.1
1
10
Latitude37.4 37.6 37.8 38.0 38.2
0.01
0.1
1
10
a b
c d
MeH
g (n
g g-1
)
Land Within 2 Km Buffer0.0 0.2 0.4 0.6 0.8 1.0
0.01
0.1
1
10
THg (ng g-1
)10 100 1000 10000
MeH
g (n
g g-1
) 0.01
0.1
1
10
TOC (%)0.1 1 10
0.01
0.1
1
10
Latitude37.4 37.6 37.8 38.0 38.2
0.01
0.1
1
10
a b
c d
MeH
g (n
g g-1
)
Open Enclosed
![Page 14: The RMP Mercury Strategy: Studies Underway. Talk Presents Multiple Data Sets Katie Harrold, Aroon Melwani, Andy Jahn, Jay Davis, John Oram, Shira Bezalel,](https://reader030.vdocuments.net/reader030/viewer/2022032805/56649eef5503460f94bff9d6/html5/thumbnails/14.jpg)
• Nearshore and enclosed sites higher
Land Within 2 Km Buffer0.0 0.2 0.4 0.6 0.8 1.0
0.01
0.1
1
10
THg (ng g-1
)10 100 1000 10000
MeH
g (n
g g-1
)
0.01
0.1
1
10
TOC (%)0.1 1 10
0.01
0.1
1
10
Latitude37.4 37.6 37.8 38.0 38.2
0.01
0.1
1
10
a b
c d
MeH
g (n
g g-1
)
Land Within 2 Km Buffer0.0 0.2 0.4 0.6 0.8 1.0
0.01
0.1
1
10
THg (ng g-1
)10 100 1000 10000
MeH
g (n
g g-1
) 0.01
0.1
1
10
TOC (%)0.1 1 10
0.01
0.1
1
10
Latitude37.4 37.6 37.8 38.0 38.2
0.01
0.1
1
10
a b
c d
MeH
g (n
g g-1
)
Open Enclosed
Sediments - RMP and other studies
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Total Length (mm)
0 20 40 60 80 100 120
Hg
(g/
g w
et)
0.01
0.1 ARROW GOBYCHEEKSPOT GOBYMISSISSIPPI SILVERSIDESHIMOFURI GOBYTOPSMELTYELLOWFIN GOBYBAY GOBYSTRIPED BASSNORTHERN ANCHOVYPACIFIC HERRING
0.4
0.003
Wetland/margin species
Open water species
Small fish also show nearshore/offshore pattern
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Sed
imen
t
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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)
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Answering the Mercury Strategy Questions Question 2: Which processes, sources, and
pathways contribute disproportionately to food web accumulation?
![Page 19: The RMP Mercury Strategy: Studies Underway. Talk Presents Multiple Data Sets Katie Harrold, Aroon Melwani, Andy Jahn, Jay Davis, John Oram, Shira Bezalel,](https://reader030.vdocuments.net/reader030/viewer/2022032805/56649eef5503460f94bff9d6/html5/thumbnails/19.jpg)
• What kinds of sites are higher in fish Hg
• Stratified probabilistic sampling
• Sampling 108 unique locations
Expanded small fish
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• What kinds of sites are higher in fish Hg– Wetlands?
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• What kinds of sites are higher in fish Hg– Wetlands?– Enclosed
sloughs?
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• What kinds of sites are higher in fish Hg– Wetlands?– Enclosed
sloughs?– Industrial
watershed drainages?
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• What kinds of sites are higher in fish Hg– Wetlands?– Enclosed
sloughs?– Industrial
watershed drainages?
– WWTPs?
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• What kinds of sites are higher in fish Hg– Wetlands?– Enclosed
sloughs?– Industrial
watershed drainages?
– WWTPs?– Contaminated
sediments
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• What kinds of sites are higher in fish Hg– Wetlands?– Enclosed
sloughs?– Industrial
watershed drainages?
– WWTPs?– Contaminated
sediments– Hg mine
drainages?
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• 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
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DGT = Diffusive Gradient in Thinfilm
• Surrogate for biotic MeHg exposure
• Integrates water or sediments longer duration than grab samples
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DGTs in the field
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Can be placed in any aquatic location
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Goals of the San Francisco Bay Hg Isotope Study
Determine the Hg isotopic composition of BedrockMine tailingsGold miningHg 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
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Answering the Mercury Strategy Questions Question 3: What are the best opportunities for
management intervention for the most important pollutant sources, pathways, and processes?
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AcknowledgementsKatie Harrold, Aroon Melwani, Andy Jahn, Jay Davis, John Oram, Shira Bezalel, Jen Hunt, Sarah Lowe, Karen TaberskiRegional Monitoring Program
Joel Blum, Gretchen Gehrke University of Michigan
Holger Hintelmann, Brian DimockTrent University
Mark Marvin-DiPasquale, David Krabbenhoft, Collin Eagles-Smith, Josh AckermanUS Geological Survey
Mark Stephenson, Wes HeimMoss Landing Marine Laboratories
Darell Slotton, Shaun AyersUniversity of California - Davis