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Trace metals and dissolved organic carbon in an estuary with restricted river flow and a brown tide bloom

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This study was designed to establish the distributions of trace metals (Cd, Co, Cu, Ni, Pb, and Zn), dissolved organic carbon (DOC), and inorganic nutrients (PO4 and H4SiO4) in the water column of the small, relatively pristine Peconic River estuary. We were also able to examine the effects of a harmful microalgal bloom, known as the brown tide, which occurred in the area during our study. Because river inflow to the Peconic estuary is restricted by a small dam at the head of the estuary, direct evaluation of the relative importance of riverine inputs on estuarine metal distributions was possible. The simultaneous analyses of geochemical carrier metals (Al, Fe, and Mn), an indicator of sewage (Ag), and other ancillary parameters (e.g., suspended particulate matter, dissolved O2, chlorophylla) were used to describe the major processes controlling metal concentrations in the dissolved phase. The trace metal distributions indicated two distinct biogeochemical regimes within the estuary: an anthropogenically perturbed region with high metal levels (e.g., Ag, 165 pM; Cu, 51 nM; Zn, 57 nM) at the head (Flanders Bay), and a larger outer region with relatively low metal concentrations. The very similar distributions of some metals (e.g., Mn, Ni) in the Peconic estuary compared to those in estuaries having much higher river flow demonstrated the dominant role of internal processes (e.g., diagenetic remobilization) in controlling these metal patterns. An inverse relationship between dissolved Fe and DOC with cell counts of the brown tide microalgaeAureococcus anophagefferens in our field study suggested a close association with the bloom, although a similar relationship was observed between dissolved Al and brown tide cell counts, implying that removal of Fe could be due to particle scavenging rather than biological uptake.

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  1. Marine Sciences Research Center, State University of New York, 11794-5000, Stony Brook, New York

    Eric Breuer & Sergio A. Sañudo-Wilhelmy

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  1. Eric Breuer
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  2. Sergio A. Sañudo-Wilhelmy
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Correspondence to Sergio A. Sañudo-Wilhelmy.

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Breuer, E., Sañudo-Wilhelmy, S.A. Trace metals and dissolved organic carbon in an estuary with restricted river flow and a brown tide bloom. Estuaries 22, 603–615 (1999). https://doi.org/10.2307/1353048

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