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Metal transfer along aquatic food chains

Show simple item record Hare, Landis 2010-04-21T19:45:13Z 2010-04-21T19:45:13Z 2010-04-21T19:45:13Z
dc.description A5. Principal Investigator: Landis Hare en
dc.description.abstract We are studying processes involved in the transfer of Cd, Ni, Se, and Tl and along aquatic food chains to understand how these trace elements reach upper trophic levels, where they can be consumed by top predators (including humans). We are investigating metal speciation in the field to determine the relative importance of various metal species (e.g., Cd, Ni, and Tl) in nature. Such field measurements also allow us to choose realistic trace element concentrations for use in experiments. In the laboratory, we expose several types of organisms (from algae to insects and oligochaete worms) to Cd, Ni, Se, or Tl to determine the forms (protein-bound, granular, etc.) in which these elements are present in their cells. We also determine how storage and detoxification patterns in prey influence the efficiency of contaminant transfer to consumers (invertebrates and fish). In the case of fish, both the relative importance of food and water as contaminant sources and toxicity are being measured. Lastly, field data are being collected on prey taxa to verify the realism of the trace element concentrations that we measure in the laboratory and to assess the extent of variation among congeners in nature. Our data will allow us to model trace element transfer along food chains, especially for the lesser-studied elements Ni and Tl, as well as to estimate the toxic effects that might occur on upper-level consumers such as fish. en
dc.description.sponsorship Metals in the Human Environment Strategic Network en
dc.language.iso en en
dc.relation.ispartofseries A;5
dc.subject Water en
dc.subject Sediment en
dc.subject Mortality en
dc.subject Metal bioaccumulation en
dc.subject Detoxification en
dc.subject Concentrations en
dc.subject Tl en
dc.subject Se en
dc.subject Ni en
dc.subject Cd en
dc.subject Food chains en
dc.subject Acquatic en
dc.title Metal transfer along aquatic food chains en
dc.type Other en
dc.contributor.affiliation School of Environmental Sciences
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