Macrophytes as indicators of land‐derived wastewater: Application of a δ15N method in aquatic systems

Water Resources Research - Tập 41 Số 1 - 2005
Marci L. Cole1,2, K. D. Kroeger1,3, J. W. McClelland1,4, Iván Valiela1
1Boston University Marine Program, Marine Biological Laboratory, Woods Hole, Massachusetts, USA
2Now at Save the Bay, Providence, Rhode Island, USA.
3Now at Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA.
4Now at Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts, USA.

Tóm tắt

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.

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Water Resources Research

Tập 41 Số 1

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