Abstract
Coastal lagoons of the Delmarva Peninsula receive varying annual nitrogen loads because of differing land uses. Extensive development and agriculture contribute to elevated nutrient loads in Maryland and Delaware. Agriculture and forests dominate Virginia’s landscape, suggesting these systems receive lower loads. We used a watershed model to achieve three objectives: (1) quantify loads to Virginia lagoons; (2) determine the sources of the loads; and (3) project changes in annual loads under different development scenarios. Model simulations indicated that some Virginia lagoons receive relatively high annual nutrient loads (kg N year−1) due to intensive agriculture and a high watershed/lagoon areal ratio. Model projections also suggested that increased agricultural and residential development in Virginia could lead to annual loads (kg N year−1) typical of impacted Maryland systems. A comparison of Maryland and Virginia water quality responses to nutrient loading suggested that Virginia’s lagoons exhibit a different response to nutrient loading, though the exact mechanism for this difference is unclear.
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Acknowledgements
We thank Jennifer Stanhope for her contribution of GIS data and extensive assistance and advice on the modeling/watershed component of this project, and Beth Condon, Benjamin Lawson, Heather Wiseman, Sean Fate, and Hunter Walker for their assistance in the field and lab. We also thank Karen McGlathery and Carl Friedrichs for their guidance and contribution throughout this project. Partial support for this research was provided by National Science Foundation (DEB Ecosystems 0542645) and through the Virginia Coast Reserve LTER project (DEB 0080381 and DEB 0621014), a VIMS Eastern Shore Laboratory student research grant, and a Marlatt Foundation student research grant. This publication represents contribution number 3115 of the Virginia Institute of Marine Science, College of William and Mary.
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Giordano, J.C.P., Brush, M.J. & Anderson, I.C. Quantifying Annual Nitrogen Loads to Virginia’s Coastal Lagoons: Sources and Water Quality Response. Estuaries and Coasts 34, 297–309 (2011). https://doi.org/10.1007/s12237-010-9345-7
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DOI: https://doi.org/10.1007/s12237-010-9345-7