biomagnification of monomethylmercury in carnegie lake n.
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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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slide2

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

size fractioning
Size Fractioning

Flow Cytometry

within each site does the concentration of mmhg increase with increasing trophic level
Within each site: Does the concentration of MMHg increase with increasing trophic level?

Clams Amphipods Blood worms Snails

slide5
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)
slide8

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

slide12

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.

slide14

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