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Measured and predicted fluxes of biogenic silica in Lake Michigan 1
Author(s) -
Schelske Claire L.,
Eadie Brian J.,
Krausse Gerald L.
Publication year - 1984
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1984.29.1.0099
Subject(s) - biogenic silica , diatom , sediment trap , water column , submarine pipeline , dissolved silica , sediment , shore , oceanography , environmental science , tributary , hydrology (agriculture) , flux (metallurgy) , photic zone , geology , phytoplankton , chemistry , geomorphology , nutrient , cartography , geotechnical engineering , organic chemistry , geography , dissolution
Diatom production in the offshore waters of Lake Michigan is limited by silica supplies in late summer and can be predicted from the seasonal disappearance of silica from the trophogenic zone. Biogenic silica fluxes obtained from sediment trap collections were compared with fluxes predicted from the silica disappearance model. Measured and predicted fluxes were in good agreement for offshore stations, but at stations closer to shore measured fluxes were 2–3 times greater than predicted fluxes. Sediment trap and water chemistry data show that little of the diatom production is dissolved in the water column. Therefore, greater than predicted fluxes at nearshore locations were attributed to new silica supplied from upwellings, tributary inputs, and recycling and resuspension in nearshore sediments. The good agreement between measured and predicted fluxes in offshore waters shows that biogenic silica fluxes may be useful in determining the collecting efficiency of sediment traps.