Water, Air, & Soil Pollution

, 227:390

Waterfowl Impoundments as Sources of Nitrogen Pollution

  • R. Scott Winton
  • Michelle Moorman
  • Curtis J. Richardson
Article

DOI: 10.1007/s11270-016-3082-x

Cite this article as:
Winton, R.S., Moorman, M. & Richardson, C.J. Water Air Soil Pollut (2016) 227: 390. doi:10.1007/s11270-016-3082-x

Abstract

Hydrologically controlled moist-soil impoundment wetlands provide critical habitat for high densities of migratory bird populations. Nutrients exported from heavily used impoundments by prescribed seasonal drawdown of surface water may contribute to the eutrophication of aquatic ecosystems. To investigate the relative importance of nutrient export from managed impoundment habitats, we conducted a field study at Mattamuskeet National Wildlife Refuge in North Carolina, USA, which contains 1545 ha of impoundments that drain into hypereutrophic Lake Mattamuskeet. We found that prescribed hydrologic drawdowns of an impoundment exported roughly the same amount of nitrogen (N) as adjacent fertilized agricultural fields on a per-area basis and contributed approximately one fifth of total N load to Lake Mattamuskeet. The prescribed drawdown regime, designed to maximize waterfowl production in impoundments, may be exacerbating the degradation of habitat quality in the downstream lake as an unintended consequence. Few studies of wetland N dynamics have targeted impoundments managed to provide wildlife habitat, but a similar phenomenon may occur in some of the 36,000 ha of similarly managed moist-soil impoundments on National Wildlife Refuges in the southeastern USA, especially those hosting dense concentrations of waterfowl. We suggest an earlier seasonal drawdown could potentially mitigate impoundment N pollution and estimate it could reduce N export from our study impoundment by more than 70 %.

Keywords

Wetlands Wildlife management Biogeochemistry Denitrification 

Supplementary material

11270_2016_3082_MOESM1_ESM.docx (555 kb)
ESM 1(DOCX 554 kb)

Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • R. Scott Winton
    • 1
  • Michelle Moorman
    • 2
  • Curtis J. Richardson
    • 1
  1. 1.Duke University Wetland Center, Nicholas School of the EnvironmentDurhamUSA
  2. 2.U.S. Fish and Wildlife Service, Mattamuskeet National Wildlife Refuge OfficeFairfieldUSA