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Agenda Item 3 Causes of Toxicity 2007-2008 Amphipod TIE Study. UC Davis - Granite Canyon Marine Pollution Studies Laboratory SFEI. Specific Questions to be Addressed in the Next Five Years. What are the spatial and temporal patterns of impacts of sediment contamination on benthic biota?

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agenda item 3 causes of toxicity 2007 2008 amphipod tie study
Agenda Item 3

Causes of Toxicity

2007-2008 Amphipod TIE Study

UC Davis - Granite Canyon Marine Pollution Studies Laboratory

SFEI

specific questions to be addressed in the next five years
Specific Questions to be Addressed in the Next Five Years
  • What are the spatial and temporal patterns of impacts of sediment contamination on benthic biota?
  • Which pollutants are responsible for observed impacts on benthic biota?
  • Are the toxicity tests, benthic community assessment approaches, and the overall SQO assessment framework we are using reliable indicators of impacts on benthic biota?
specific questions to be addressed in the next five years1
Specific Questions to be Addressed in the Next Five Years
  • .
  • Which pollutants are responsible for observed impacts on benthic biota?
  • .
major elements for the next five years
Major Elements for the Next Five Years
  • Status and Trends Monitoring
  • Causes of Sediment Impacts
  • Understanding and Improving Sediment Assessment Tools
project goals
Project Goals
  • Verify and improve newly-developed sediment TIE methods for the estuarine amphipod Eohausorius estuarius.
slide10

Sediment Chemistry Highlights

  • Ambient sediment chemicals were below threshold limits
  • Sediment contained a complex mixture of chemicals
    • SQGQ = 21.3 (Fairey et al. 2001) – 6.9 without chlordane (toxicity expected at >3.5)
  • Some evidence of PAH toxicity – R. abronius LC50 exceeded and models predict small contribution
slide11

Tox. WG 2009 Proposal

Develop more LC50 data

Continue work on the amphipod TIE methods

Develop a strategy to further address the causes of toxicity in moderately toxic sediments through a workgroup process.

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