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Biomagnification of Monomethylmercury in Carnegie Lake

Biomagnification of Monomethylmercury in Carnegie Lake. Are there differences in MMHg uptake for different species of phytoplankton? Which characteristics might be related to increased uptake?. Size Fractioning. Flow Cytometry.

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Biomagnification of Monomethylmercury in Carnegie Lake

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  1. Biomagnification of Monomethylmercuryin Carnegie Lake

  2. Are there differences in MMHg uptake for different species of phytoplankton? Which characteristics might be related to increased uptake?

  3. Size Fractioning Flow Cytometry

  4. Within each site: Does the concentration of MMHg increase with increasing trophic level? Clams Amphipods Blood worms Snails

  5. Comparing the 5 sites: Is there a correlation between the density of phytoplankton and the concentration of mercury in the biota? • Phytoplankton density based on fluorescence of chlorophyll (mg of chlorophyll L-1)

  6. High Plankton Densities Reduce Mercury BiomagnificationChen & Folt, 2005

  7. Question: Is there a correlation between the density of phytoplankton and the concentration of MMHg in the biota?

  8. CONTAMINATED FILTER

  9. 312.4 ppb HgT 705.6 ppb HgT Mean Mercury Concentrations in Freshwater Fish Species Mean concentration (ppb) Bottom Feeders Carp 110 White sucker 110 Channel catfish 90 Predator Fish Largemouth bass 460 Smallmouth bass 340 Walleye 520 Brown trout 140 a EPA National Study of Chemical Residues in Fish 1987; b Concentrations are reported on wet weight basis Source: Bahnick et al., 1994.

  10. Biomagnification of Total Mercury X 8 X 2 X 20,000

  11. Thanks to PEI, Dr. Eileen Zerba, Dr. Francois Morel, Frank Black, NejmaPiagentini, and my fellow interns for all your help this summer!

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