sean p. powers university of south alabama and the dauphin … · 2010-10-08 · sean p. powers...
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Sean P. PowersUniversity of South Alabama and the
Dauphin Island Sea Lab
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NCEAS Ecotoxicology working group (MetDauphin Island Sea Lab - September)
FSU NSF Coastal Rapid Award recipients
NOAA NRDA Trustee Working Groups
10 yrs in Prince William Sound examininglingering effects (Herring)
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60,000 Barrels (2.4 million gallons) ofoil and methane discharged per day
Oil flowed for 86 days following theDeepwater Horizon explosion
~200 million gallons of oil discharged.
Meterological and oceanic conditionsinitially favored an offshoreentrainment.
After 4 -6 weeks oil began impactingnearshore habitats of Louisiana,Mississippi, Alabama and NW Florida.
Flow stopped on July 15, 2010
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NearshoreEstuaryContinental shelf
PelagicOceanicNeritic
Epipelagic
Mesopelagic
0 to 200 m
1000 m
4000 m
Bathypelagic
Photic
APh
otic
Bathyal
Benthic
WindSheensThick Oil
Dispersant
Turbulent Dispersion
Volatilization
Turbulent Dispersion
Surfacing
Current
Adsorption and Adherence to Particulates
Complex Physics and Chemistry
Oceanography of the spillOceanography of the spill
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Despite herculean efforts (dispersants, burning,booming, etc.) to keep oil offshore-oil enterednearshore/estuarine environments
Mitigate nearshore impacts vs. scientificuncertainty offshore (Policy & Science Question)
Observations suggest oil has remained
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11 million gallons of North Slope crudereleased in short period.
Fisheries closed for several years in PWS,Herring has still not recovered after 20 yrs.
30 resources (habitat or species) seriouslyinjured - Four remain injured/unknownrecovery.
Extensive socio-economic and ecologicalinjury.
Habitat injury responsible for many direct,indirect and lingering effects.
Response activities resulted in significantdamage
Socio-ecological damages are linked and stilllinger.
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Contaminant Impacts Oiling
Response Associated Impacts Dispersants Freshwater diversions/atleration Boom deployments Physical disturbance from clean-up
Debris removal Deep beach excavation/cleaning Traffic Human Activity
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Linking Habitat with Fisheries Production
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17. SAV, epiphytes ¯oalgae
16. Phytoplankton µbial loop
18. Benthic microalgalcommunity
21. Detritus
15. Zooplankton
5. Jellyfish
6. Menhaden, Anchovies,Silversides (Pelagic fish)
4. Bluefish & largeflounder
9. Blue Crab
13. Softbodiedbenthos
14. Meio-benthos
12. Molluscs
7. Demersalfishes19. Pelagic carrion 20. Demersal
carrion 10. Brownor pinkshrimp
11. Whiteshrimp
1. Large predators
2. Sea turtles
3. Gulls
8. Reddrum
Model OutlineA
cute
& C
hron
ic Im
pact
C enters foodweb?
Hab
itat D
egra
datio
n
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Myth 1: Now that the well is capped, we no longerneed to be worried about oil on our Gulf shores.
The reality is that much oil persists in theenvironment close to sensitive habitats, and this oilcould be the source of long-term, persistent, low-level exposures to coastal life. We have learnedfrom previous oil spills, such as the Exxon Valdezand Ixtoc I near Mexico, that toxic oil can persist inthe environment for decades.
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Myth 2: Dead animals reflect the most significantnegative impacts from oil contamination. .
Most people are deeply disturbed by images ofoiled birds, turtles, and dolphins that arestruggling to survive the immediate crisis of oilexposure. These effects are highly visible, areclearly appalling, and demand our attention andaction. However, the non-lethal effects on wildlifeare significant sources of injury and can affect thelong-term integrity of populations.
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Myth 3: Since scientists have learned much fromstudying other oil spills, nothing new is to be learnedfrom studying the BP spill.
The Gulf of Mexico harbors many sensitive andcomplex ecosystems that will respond in uniqueways to oil, including seagrass beds, mangroveforests, sub-tropical coral reefs, and salt marshes.All oil spills share some common risks and effects.However, since the chemical nature of crude oilsvary extensively and since each ecosystem isdifferent, major oil spills require uniquely tailoredand focused research programs to document andlearn about their effects.
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The massive response activities may result inlarge areas receiving relatively lowconcentration of contaminants (although someareas did receive heavy oiling). A key questionis what is the effect, if any, of lowconcentrations of contaminants.
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Myth 4: Oil cleanup activities can only help theenvironment
Well-recognized is that some well-intentionedinterventions can have serious unintendedconsequences, and these should be consideredtogether with the risks of oiling.
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What oil and dispersant contamination has beenobserved in different coastal regions?
How can we more effectively monitor and detectcontamination in different environments?Alternatively, what methods and techniques areappropriate for monitoring and detection indifferent coastal environments?
What impacts on ecosystems and ecosystemservices have been observed or can be expectedgiven levels of contamination? What types ofstudies are needed to better characterize theseimpacts?
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What is the effectiveness of different mitigationstrategies? What are potential negative impacts ofresponse and mitigation strategies?
How can coastal monitoring efforts among federaland non-federal programs be better coordinatedand information sharing be promoted?
What are the methodologies being used by thedifferent NRDA Technical Working Groups andwhat are the opportunities for other scientists to beinvolved in NRDA efforts?
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Pathway and risk of exposure high Complex habitat – fills a unique role offshore in
“coastal” systems