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au=wei

HR: 09:30h
AN: OS31L-05
TI: Cadmium as a Nutrient in the Modern and Paleo-ocean: What Controls its Uptake by Phytoplankton?
AU: * Wei, L
EM: wei@imcs.rutgers.edu
AF: Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901-8521 United States
AU: Sherrell, R M
EM: sherrell@imcs.rutgers.edu
AF: Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901-8521 United States
AB: Cadmium has been one of the most interesting and useful metals for tracing physical and biogeochemical processes in the past ocean. The nutrient role of Cd is still not well understood, however, and the Cd content of phytoplankton appears to depend more strongly on environmental conditions than does the content of other nutrient metals. Recent studies indicate a general interaction of Cd uptake with bioavailable Zn and Mn, with an independent control by dissolved CO2 in diatoms, while quantitative and biochemical aspects appear to be under taxonomic control. Greater understanding of the complicated interactions that drive removal of Cd by primary producers is important to ecological and paleoproductivity reconstructions. To elucidate the mechanisms of the dependency of Cd uptake on availability of other metals, CO2(aq) and taxonomic differences, we have initiated a study of uptake of Cd, as well as full suite of additional bioactive trace metals (Fe, Mn, Zn, Cu, Ni, Co, V, Mo), relative to quotas for P, N and C, with metal content determined by HR-ICP-MS. We present initial results of culturing studies on 12 phytoplankton species representing four major phylogenetic taxa, grown under different pCO2 conditions in metal-buffered growth media. Results will be interpreted in the context of modeling dissolved metal/nutrient ratios in surface waters as a function of the important controlling variables in the modern and ancient ocean.
DE: 0330 Geochemical cycles
DE: 0400 Biogeosciences
DE: 1065 Trace elements (3670)
DE: 4857 Pollution
SC: OS
MN: 2004 Ocean Sciences Meeting