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    Macrophytes as indicators of land-derived wastewater : application of a δ15N method in aquatic systems

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    2004WR003269.pdf (284.3Kb)
    Date
    2005-01-25
    Author
    Cole, Marci L.  Concept link
    Kroeger, Kevin D.  Concept link
    McClelland, James W.  Concept link
    Valiela, Ivan  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3471
    As published
    https://doi.org/10.1029/2004WR003269
    DOI
    10.1029/2004WR003269
    Keyword
     δ15N; Macrophyte; Stable isotope; Wastewater 
    Abstract
    We measured δ15N signatures of macrophytes and particulate organic matter (POM) in six estuaries and three freshwater ponds of Massachusetts to assess whether the signatures could be used as indicators of the magnitude of land-derived nitrogen loads, concentration of dissolved inorganic nitrogen in the water column, and percentage of N loads contributed by wastewater disposal. The study focused specifically on sites on Cape Cod and Nantucket Island, in the northeastern United States. There was no evidence of seasonal changes in δ15N values of macrophytes or POM. The δ15N values of macrophytes and POM increased as water column dissolved inorganic nitrogen concentrations increased. We found that δ15N of macrophytes, but not of POM, increased as N load increased. The δ15N values of macrophytes and groundwater NO3 tracked the percent of wastewater contribution linearly. This research confirms that δ15N values of macrophytes and NO3 can be excellent indicators of anthropogenic N in aquatic systems.
    Description
    Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Water Resources Research 41 (2005): W01014, doi:10.1029/2004WR003269.
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    • Boston University Marine Program (BUMP)
    Suggested Citation
    Water Resources Research 41 (2005): W01014
     
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