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Assessing past changes in bioavailable zinc from a terrestrial (Zn/Si)opal record |
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| Authors: | Thomas Jaccard Daniel Ariztegui Kevin J Wilkinson |
| Institution: | 1. Department of Pharmacology & Toxicology, Georgia Health Sciences University, Augusta, GA, USA;2. Department of Physiology, Georgia Health Sciences University, Augusta, GA, USA;3. Department of Cell Biology and Anatomy, Georgia Health Sciences University, Augusta, GA, USA;4. Vascular Biology Center, Georgia Health Sciences University, Augusta, GA, USA;5. Department of Cardiology, University of Chicago Medicine, Chicago, IL, USA;1. U.S. Geological Survey, 345 Middlefield Road, Mailstop 480, Menlo Park, CA 94025, USA;2. U.S. Geological Survey, Placer Hall, 6000 J St., Sacramento, CA 95819, USA;3. U.S. Geological Survey, Fort Collins Science Center, Building 21, Mailstop 963, Denver, CO 80225, USA |
| Abstract: | Historical changes in bioavailable Zn concentrations of the surface waters of Lake Geneva were assessed by analyzing the zinc content of fossil diatoms. The measured ratios of Zn to Si in the opal ((Zn/Si)opal) were consistent with both data obtained for cultured freshwater diatoms that were representative of lake Geneva and with field data. Reconstructed variations suggested that increased Zn uptake by phytoplankton occurred in the period from 1960–1980 resulting from an increased loading of Zn to the lake. Nonetheless, observed concentrations were sufficiently low that no adverse effects were expected on the pelagic community. The data presented here suggest that (Zn/Si)opal records may become a valuable tool to assess past changes in bioavailable Zn concentrations in freshwater systems. |
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