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Changes in dissolved organic matter characteristics in Chincoteague Bay during a bloom of the pelagophyteAureococcus anophagefferens

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Abstract

Aureococcus anophagefferens, the pelagophyte responsible for brown tide blooms, occurs in coastal bays along the northeast coast of the United States. This species was identified in Chincoteague Bay, Maryland, in 1997 and has bloomed there since at least 1998. Time series of dissolved organic matter (DOM) concentrations and characteristics are presented for two sites in Chincoteague Bay: one that experienced a brown tide bloom in 2002 and one that did not. Characteristics of the bulk DOM pool were obtained using dissolved organic carbon (DOC) and ultraviolet-visible (UV-Vis) measurements (spectral slope and specific UV absorbance). High molecular weight DOM (HMW-DOM) was characterized in terms of DOC concentration, carbon: nitrogen (C:N) ratio, isotopic signature, and molecular-level characteristics as determined by direct temperature resolved mass spectrometry (DT-MS). Compositional changes in the DOM pool are associated with brown tide blooms, although a direct relationship between DOM characteristics and bloom development could not be confirmed. DOC measurements suggest that during the brown tide bloom, HMW-DOM was released into the surface water. UV-Vis analysis on the bulk DOM and molecular-level characterization of the HMW-DOM using DT-MS show that this material was optically active and more aromatic in nature. Based upon C:N ratio and HMW-DOC measurements, it appears that this HMW-DOM was more nitrogen enriched. Whether this material was released as exudates or was due to lysis ofA. anophagefferens could not be determined.

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  1. Jean-Paul Simjouw

    Present address: Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, 71 Dudley Road, 08901, New Brunswick, New Jersey

Authors and Affiliations

  1. Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, 4600 Elkhorn Ave, 23529, Norfolk, Virginia

    Jean-Paul Simjouw & Margaret R. Mulholland

  2. Department of Chemistry and Biochemistry, Old Dominion University, 4541 Hampton Boulevard, 23529, Norfolk, Virginia

    Elizabeth C. Minor

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  1. Jean-Paul Simjouw
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  2. Margaret R. Mulholland
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  3. Elizabeth C. Minor
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Correspondence to Jean-Paul Simjouw.

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Simjouw, JP., Mulholland, M.R. & Minor, E.C. Changes in dissolved organic matter characteristics in Chincoteague Bay during a bloom of the pelagophyteAureococcus anophagefferens . Estuaries 27, 986–998 (2004). https://doi.org/10.1007/BF02803425

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