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The Effects of Varying Salinity on Ammonium Exchange in Estuarine Sediments of the Parker River, Massachusetts

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Abstract

We examined the effects of seasonal salinity changes on sediment ammonium (NH4 +) adsorption and exchange across the sediment–water interface in the Parker River Estuary, by means of seasonal field sampling, laboratory adsorption experiments, and modeling. The fraction of dissolved NH4 + relative to adsorbed NH4 + in oligohaline sediments rose significantly with increased pore water salinity over the season. Laboratory experiments demonstrated that small (∼3) increases in salinity from freshwater conditions had the greatest effect on NH4 + adsorption by reducing the exchangeable pool from 69% to 14% of the total NH4 + in the upper estuary sediments that experience large (0–20) seasonal salinity shifts. NH4 + dynamics did not appear to be significantly affected by salinity in sediments of the lower estuary where salinities under 10 were not measured. We further assessed the importance of salinity-mediated desorption by constructing a simple mechanistic numerical model for pore water chloride and NH4 + diffusion for sediments of the upper estuary. The model predicted pore water salinity and NH4 + profiles that fit measured profiles very well and described a seasonal pattern of NH4 + flux from the sediment that was significantly affected by salinity. The model demonstrated that changes in salinity on several timescales (tidally, seasonally, and annually) can significantly alter the magnitude and timing of NH4 + release from the sediments. Salinity-mediated desorption and fluxes of NH4 + from sediments in the upper estuary can be of similar magnitude to rates of organic nitrogen mineralization and may therefore be important in supporting estuarine productivity when watershed inputs of N are low.

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Acknowledgments

We gratefully acknowledge the help of David Vasiliou, Thomas Mondrup, and Greg Peterson with field collection and laboratory analyses. We also thank Christof Meile for comments on the manuscript. The research was supported by the PIE-LTER (National Science Foundation Division of Ocean Sciences grant number 9726921; National Science Foundation—Division of Ocean Sciences grant number 0423565) and the National Oceanic and Atmospheric Administration (NOAA), Department of Commerce under grant number NA16RG2273, Woods Hole Oceanographic Institutions Sea Grant project R/M-50 and R/M-53. The views expressed here are those of the authors and do not necessarily reflect the views of NOAA or any of its subagencies.

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Authors and Affiliations

  1. Department of Geography and the Environment, Villanova University, Villanova, PA, USA

    Nathaniel B. Weston

  2. The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA, USA

    Anne E. Giblin & Jane Tucker

  3. Department of Environmental, Social, and Spatial Change, Roskilde University, Roskilde, Denmark

    Gary T. Banta

  4. Department of Marine Sciences, University of Georgia, Athens, GA, USA

    Charles S. Hopkinson

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  1. Nathaniel B. Weston
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  2. Anne E. Giblin
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  4. Charles S. Hopkinson
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  5. Jane Tucker
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Correspondence to Nathaniel B. Weston.

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Weston, N.B., Giblin, A.E., Banta, G.T. et al. The Effects of Varying Salinity on Ammonium Exchange in Estuarine Sediments of the Parker River, Massachusetts. Estuaries and Coasts 33, 985–1003 (2010). https://doi.org/10.1007/s12237-010-9282-5

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