Abstract
Biogenic silica (BSi), total phosphorus (TP), and biologically available phosphorus (AVP) were measured in short cores from Lake Michigan, Lake Erie, and Lake Ontario. Peaks in BSi concentration and peaks in BSi:TP or BSi:AVP ratios provided stratigraphic signals of water column silica (Si) depletion as a response of increased diatom production to P enrichment and decreased diatom production resulting from silica depletion. By contrast the stratigraphic record of P accumulation provided very weak signals of the historical nutrient enrichment in the water column. These results indicate that system P recycling has a higher rate constant than Si recycling and, as a consequence, that relatively small levels of P enrichment can increase diatom production and sedimentation eventually causing Si depletion and Si-limited diatom production in the water mass.
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© 1987 Dr W. Junk Publishers, Dordrecht
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Schelske, C.L., Conley, D.J., Stoermer, E.F., Newberry, T.L., Campbell, C.D. (1987). Biogenic silica and phosphorus accumulation in sediments as indices of eutrophication in the Laurentian Great Lakes. In: Löffler, H. (eds) Paleolimnology IV. Developments in Hydrobiology, vol 37. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4047-5_12
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DOI: https://doi.org/10.1007/978-94-009-4047-5_12
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