Exposure and Effects Pilot Exposure and Effects Pilot Study Study Small Fish Mercury Project Small Fish Mercury Project Ben Greenfield Ben Greenfield 1 , Letitia Grenier , Letitia Grenier 1 , Andrew Jahn , Andrew Jahn 2 , , Seth Shonkoff Seth Shonkoff 1 , Mark Sandheinrich , Mark Sandheinrich 3 , Jay Davis , Jay Davis 1 1. San Francisco Estuary Institute 1. San Francisco Estuary Institute 2. 1000 Riverside Drive, Ukiah, CA 2. 1000 Riverside Drive, Ukiah, CA 3. River Studies Center, University of Wisconsin – La Crosse 3. River Studies Center, University of Wisconsin – La Crosse
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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 , Jay Davis 1 1. San Francisco Estuary Institute 2. 1000 Riverside Drive, Ukiah, CA - PowerPoint PPT Presentation
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Exposure and Effects Pilot Exposure and Effects Pilot StudyStudy
Small Fish Mercury Project Small Fish Mercury Project
Ben GreenfieldBen Greenfield11, Letitia Grenier, Letitia Grenier11, Andrew Jahn, Andrew Jahn22, ,
Seth ShonkoffSeth Shonkoff11, Mark Sandheinrich, Mark Sandheinrich33, Jay Davis, Jay Davis11
1. San Francisco Estuary Institute1. San Francisco Estuary Institute2. 1000 Riverside Drive, Ukiah, CA2. 1000 Riverside Drive, Ukiah, CA
3. River Studies Center, University of Wisconsin – La Crosse3. River Studies Center, University of Wisconsin – La Crosse
Small Fish Hg ProjectSmall Fish Hg Project
BackgroundBackground Mercury (Hg) in N. California waters a Mercury (Hg) in N. California waters a
longstanding management concern due longstanding management concern due to historic miningto historic mining
Elevated concentrations in sport fishElevated concentrations in sport fish San Francisco Estuary site of extensive San Francisco Estuary site of extensive
wetland restoration activitywetland restoration activity Sensitive wildlife in regionSensitive wildlife in region
Striped bass Hg concentrations Striped bass Hg concentrations in SF Estuary over timein SF Estuary over time
Year
1970 1971 1972 1994 1997 1999 2000 2003
Mer
cury
Con
cent
ratio
n (
g/g)
0.1
0.2
0.3
0.4
0.5
0.60.70.80.9
1
1.8
1.2
2
1.41.6
For more information on sport fish monitoring, see poster # 27
Small Fish Hg ProjectSmall Fish Hg Project
GoalsGoals Characterize food-web mercury at fine Characterize food-web mercury at fine
spatial and temporal scalesspatial and temporal scales Collect data for wildlife risk evaluationsCollect data for wildlife risk evaluations Detect regional trends in Detect regional trends in
bioaccumulation of Hg related to bioaccumulation of Hg related to wetland restorationwetland restoration
Identify differences in pattern between Identify differences in pattern between benthic and pelagic food websbenthic and pelagic food webs
DesignDesign 8 sites within San Francisco Estuary8 sites within San Francisco Estuary
4 sites near restoration projects4 sites near restoration projects 4 index sites near extant marshes4 index sites near extant marshes
Additional samples in deep waterAdditional samples in deep water Sample benthic and pelagic species at each siteSample benthic and pelagic species at each site
Use related types of species to create data sets Use related types of species to create data sets comparable across a wide range of salinitiescomparable across a wide range of salinities
Topsmelt/Mississippi (inland) silversides (Atherinopsidae)Topsmelt/Mississippi (inland) silversides (Atherinopsidae) Arrow goby, cheekspot, and Shimofuri goby (Arrow goby, cheekspot, and Shimofuri goby (TridentigerTridentiger)) Bay goby from deep waterBay goby from deep water
DesignDesign Four composites per species per site - Four composites per species per site -
allow statistical comparisonallow statistical comparison 5-10 individuals/composite5-10 individuals/composite Minimize covariates by using consistent Minimize covariates by using consistent
sizessizes
Coordination with other monitoringCoordination with other monitoring GeographicGeographic
EEPS samples bay edge - South, Central and EEPS samples bay edge - South, Central and North BayNorth Bay
South Bay Salt Pond Hg project samples South Bay Salt Pond Hg project samples inside marshes, ponds, and sloughs inside marshes, ponds, and sloughs
CBDA Fish Mercury Project - North Bay, more CBDA Fish Mercury Project - North Bay, more freshwater focusfreshwater focus
SpeciesSpecies Intent to produce data set as comparable as Intent to produce data set as comparable as
April RobinsonBridget MooneyCindy PattyDarell SlottenMarco SigalaDave CraneSarah CohenMeg SedlakJoel BakerArthur FongSF Bay National Wildife RefugeCalifornia State ParksCA Department Fish & Game