Lessons learned about metals in the Estuary: The importance of long term clam accumulation data Cynthia L. Brown, Samuel N. Luoma, Francis Parchaso, Janet.

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Presentation transcript:

Lessons learned about metals in the Estuary: The importance of long term clam accumulation data Cynthia L. Brown, Samuel N. Luoma, Francis Parchaso, Janet K.Thompson and Jeanne DiLeo U.S. Geological Survey

25 mm

What we have learned from Potamocorbula and Macoma

1.Do river inflows affect the bioavailability of different metals? 2.What is the influence of water chemistry (salinity)? 3.Can metal effects be separated from other influences in an environment this complex? 4.How does history affect interpretations of long term data sets?

1.Do river inflows affect the bioavailability of different metals? 2.What is the influence of water chemistry (salinity)? 3.Can metal effects be separated from other influences in an environment this complex? 4.How does history affect interpretations of long term data sets?

Freshwater inflow is a primary influence on metal accumulation

1.Do river inflows affect the bioavailability of different metals? 2.What is the influence of water chemistry (salinity)? 3.Can metal effects be separated from other influences in an environment this complex? 4.How does history affect interpretations of long term data sets?

Water chemistry (salinity) affects cadmium bioaccumulation

1.Do river inflows affect the bioavailability of different metals? 2.What is the influence of water chemistry (salinity)? 3.Can metal effects be separated from other influences in an environment this complex? 4.How does history affect interpretations of long term data sets?

Detecting silver impacts in a complex estuary

Potamocorbula amurensis EggsSperm

1.Do river inflows affect the bioavailability of different metals? 2.What is the influence of water chemistry (salinity)? 3.Can metal effects be separated from other influences in an environment this complex? 4.How does history affect interpretations of long term data sets?

The importance of a long term perspective

Contaminants bioaccumulate differently Metals cause detectable biological signals Integration of hydrodynamics, sediment dynamics, reproduction and geochemistry is essential to understanding processes in this complicated ecosystem.