Lisa Thiebaud Nicoli & Letitia Logan Passarella KEY FINDINGS
Exposure and Effects Pilot Study Small Fish Mercury Project Ben Greenfield 1, Letitia Grenier 1,...
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Transcript of Exposure and Effects Pilot Study Small Fish Mercury Project Ben Greenfield 1, Letitia Grenier 1,...
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, Joy Andrews, Joy Andrews44,,
Jay DavisJay Davis11
1. SFEI; 2. 1000 Riverside Drive, Ukiah, CA; 3. River Studies Center, University of 1. SFEI; 2. 1000 Riverside Drive, Ukiah, CA; 3. River Studies Center, University of Wisconsin – La Crosse; 4. California State University – East BayWisconsin – La Crosse; 4. California State University – East Bay
EEPS ― Small Fish Hg EEPS ― Small Fish Hg ProjectProject
GoalsGoals Characterize food-web mercury at finer Characterize food-web mercury at finer
spatial and temporal scales than sport spatial and temporal scales than sport fish studiesfish studies
Detect regional trends in bioaccumulation Detect regional trends in bioaccumulation of Hg related to wetland restorationof Hg related to wetland restoration
Identify differences in pattern between Identify differences in pattern between benthic and pelagic food websbenthic and pelagic food webs
EEPS ― Small Fish Hg EEPS ― Small Fish Hg ProjectProject
DesignDesign 8 sites from South Bay to Suisun Bay8 sites from South Bay to Suisun Bay
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
EEPS ― Small Fish Hg EEPS ― Small Fish Hg ProjectProject
Collaboration and leverageCollaboration and leverage Analytical lab - UW LaCrosse River Studies Analytical lab - UW LaCrosse River Studies
CenterCenter Additional samples for individual Hg Additional samples for individual Hg
analysis by CSU - East Bay (Joy Andrews)analysis by CSU - East Bay (Joy Andrews) Extra samples collected using clean Extra samples collected using clean
techniques for trace organics analysistechniques for trace organics analysis Looking for funding for analysisLooking for funding for analysis
Bay Gobies from IEP trawl surveysBay Gobies from IEP trawl surveys
EEPS ― Small Fish Hg EEPS ― Small Fish Hg ProjectProject
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
possible across regionpossible across region
EEPS ― Small Fish Hg EEPS ― Small Fish Hg ProjectProject
Station Sal
inity
Tops
mel
t
Silv
ersi
de
Bay
Gob
y
Che
eksp
ot G
oby
Arr
ow G
oby
Shi
mof
uri G
oby
Alviso Slough 23 4 4China Camp 26 4 4Newark Slough 27 2 4 4Eden Landing 29 1 4 4Birds Island 29 2 3 4Oakland Harbor 32 4 4
IEP Treasure Island 4IEP Candlestick 4
EEPS ― Small Fish Hg EEPS ― Small Fish Hg ProjectProject
3
EEPS ― Small Fish Hg EEPS ― Small Fish Hg ProjectProject
TreatmentReferenceBay Goby
Preliminary ResultsPreliminary Results
72 Composite samples analyzed 72 Composite samples analyzed Data received last weekData received last week QA was goodQA was good
94% recovery of spiked samples94% recovery of spiked samples 5% relative standard deviation of 5% relative standard deviation of
triplicate samplestriplicate samples
Pelagic Species Higher
Spatial PatternsSpatial Patterns
Alviso Slough
Newark SloughBird Island
Eden Landing
Oakland Middle Harbor
China Camp
Benicia Park
Comparison to Fish/WildlifeComparison to Fish/WildlifeRisk ThresholdsRisk Thresholds
* Tissue concentration dry weight
Source1. Johnson and Looker 20042. Beckvar et al. 20063. Calculated from BTAG Toxicity Reference Values
Threshold Endpoint # Above % Above0.030 TMDL Target for wildlife (1) 37 41%0.200 Fish growth, reproduction, development, behavior (2) 3 3%0.130* NOAEL for small sized piscivorous birds (3) 72 80%1.440* LOAEL for medium sized piscivorous birds (3) 1 1%
SummarySummary
Variation among speciesVariation among species Mississippi Silverside > Topsmelt > Mississippi Silverside > Topsmelt >
Arrow/Cheekspot Gobies > Bay GobyArrow/Cheekspot Gobies > Bay Goby Variation among stationsVariation among stations
Alviso Slough generally elevatedAlviso Slough generally elevated Southern stations elevated in silversides Southern stations elevated in silversides
(Alviso, Newark, Bird Island)(Alviso, Newark, Bird Island)
Future StepsFuture Steps
Evaluate species selectionEvaluate species selection Are we on the right track with chosen Are we on the right track with chosen
species?species? Evaluate sample sizes and study Evaluate sample sizes and study
designdesign Power analysisPower analysis
Estimate wildlife riskEstimate wildlife risk Long-term trend evaluationLong-term trend evaluation
Thanks to…
April RobinsonBridget MooneyCindy PattyDarell SlottenMarco SigalaDave CraneSarah CohenMeg SedlakJoel BakerArthur FongSF Bay National Wildife RefugeCalifornia State ParksCA Department Fish & Game