Abstract
In the Northeastern USA, multiple anthropogenic stressors, including changing nutrient loads, accelerated sea level rise, and altered climatic patterns, are co-occurring and are likely to influence salt marsh nitrogen (N) dynamics. We conducted a multiple-stressor mesocosm experiment to assess impacts of climate change and nutrient load on N uptake by the ecosystem dominant species. The New England salt marsh plant Spartina alterniflora was planted at mean high water (MHW) and 15 cm above and below MHW in tanks plumbed to mimic tides. The experiment consisted of two nutrient treatments (enriched, unenriched), three precipitation treatments (rain, storm, and no precipitation or control), and three elevations (low, mean, and high), with four replicate pots for each. A quarter of the way into the experiment (1 month), an N stable isotope tracer was added to a portion of the precipitation events received by the rain and storm treatments to assess how N is retained by the different components of each treatment. At the completion of the experiment, Spartina pots in the rain treatments retained far more tracer than the pots receiving the twice monthly storms, with the most tracer recovered at the highest elevation in all precipitation treatments as these pots received direct tracer input to stems and sediment surface. Experimental results suggest that the elevation of the marsh as well as the timing and delivery of rainfall may be important factors in how salt marshes intercept, retain, and transform N.
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References
Anisfeld, S.C., and T.D. Hill. 2012. Fertilization effects on elevation change and belowground carbon balance in a Long Island sound tidal marsh. Estuaries and Coasts 35: 201–211.
Benotti, M.J., M. Abbene, and S.A. Terracciano. 2007. Nitrogen loading in Jamaica Bay, Long Island, New York: predevelopment to 2005. U.S. Geological Survey Scientific Investigations Report 2007–5051, 17 p., online only, http://pubs.usgs.gov/sir/2007/5051/. Accessed 12 September 2014.
Bernot, M.J., R.J. Bernot, and J.T. Morris. 2009. Nutrient cycling relative to δ15N and δ13C natural abundance in a coastal wetland with long-term nutrient additions. Aquatic Ecology 43: 803–813.
Bintz, J.C., S.W. Nixon, B.A. Buckley, and S.L. Granger. 2003. Impacts of temperature and nutrients on coastal lagoon plant communities. Estuaries 26: 765–776.
Boon, J.D. 2012. Evidence of sea level acceleration at U.S. and Canadian tide stations, Atlantic Coast, North America. Journal of Coastal Research 28: 1437–1445.
Brin, L.D., I. Valiela, D. Goehringer, and B. Howes. 2010. Nitrogen interception and export by experimental salt marsh plots exposed to chronic nutrient addition. Marine Ecology Progress Series 400: 3–17.
Cahoon, D.R., and G.R. Guntenspergen. 2010. Climate change, sea-level rise, and coastal wetlands. National Wetlands Newsletter 32: 8–12.
Charles, H., and J.S. Dukes. 2009. Effects of warming and altered precipitation on plant and nutrient dynamics of a New England salt marsh. Ecological Applications 19: 1758–1773.
Deegan, L.A. 2002. Lessons learned: the effects of nutrient enrichment on the support of nekton by seagrass and salt marsh ecosystems. Estuaries 25: 727–742.
Deegan, L.A., A. Wright, S.G. Ayvazian, J.T. Finn, H. Golden, R.R. Merson, and J. Harrison. 2002. Nitrogen loading alters seagrass ecosystem structure and support of higher trophic levels. Aquatic Conservation: Marine and Freshwater Ecosystems 12: 193–212.
Deegan, L.A., D.S. Johnson, R.S. Warren, B.J. Peterson, J.W. Fleeger, S. Fagherazzi, and W.M. Wollheim. 2012. Coastal eutrophication as a driver of salt marsh loss. Nature 490: 388–392.
Donnelly, J.P., and M.D. Bertness. 2001. Rapid shoreward encroachment of salt marsh cordgrass in response to accelerated sea-level rise. Proceedings of the National Academy of Science 98: 14218–14223.
Duarte, C.M., I.E. Hendriks, T.S. Moore, Y.S. Olsen, A. Steckbauer, L. Ramajo, J. Carstensen, J.A. Trotter, and M. McCulloch. 2013. Is ocean acidification an open-ocean syndrome? Understanding anthropogenic impacts on seawater pH. Estuaries and Coasts 36: 221–236.
Ford, M.A., D.R. Cahoon, and J.C. Lynch. 1999. Restoring marsh elevation in a rapidly subsiding salt marsh by thin-layer deposition of dredged material. Ecological Engineering 12: 189–205.
Frumhoff, P.C., J.J. McCarthy, J.M. Melillo, S.C. Moser, D.J. Wuebbles. 2007. Confronting climate change in the northeast: science, impacts, and solutions. Union of Concerned Scientists, Cambridge, http://www.northeastclimateimpacts.org/pdf/confronting-climate-change-in-the-u-s-northeast.pdf. Accessed 12 September 2014.
Fry, B. 2006. Stable isotope ecology. New York: Springer.
Hartig, E.K., V. Gornitz, A. Kolker, F. Mushacke, and D. Fallon. 2002. Anthropogenic and climate-change impacts on salt marshes of Jamaica Bay, New York City. Wetlands 22: 71–89.
Howes, B.L., P.K. Weiskel, D.D. Goehringer, and J.M. Teal. 1996. Interception of freshwater and nitrogen transport from uplands to coastal waters: the role of saltmarshes. In Estuarine shores: hydrological, geomorphological and ecological interactions, ed. K.F. Nordstrom and C.T. Roman, 287–310. Sussex: John Wiley and Sons, Ltd.
JGOFS Protocols. 1994. Chapter 14. Measurement of chlorophyll a and phaeopigments by fluorometric analysis. http://ijgofs.whoi.edu/Publications/Report_Series/JGOFS_19.pdf. Accessed 12 September 2014.
Kirwan, M.L., and J.P. Megonigal. 2013. Tidal wetland stability in the face of human impacts and sea-level rise. Nature 504: 53–60.
Langley, J.A., K.L. McKee, D.R. Cahoon, J.A. Cherry, and J.P. Megonigal. 2009. Elevated CO2 stimulates marsh elevation gain, counterbalancing sea-level rise. Proceedings of the National Academy of Science 106: 6182–6186.
Morris, J.T. 2007. Ecological engineering in intertidal saltmarshes. Hydrobiologia 577: 161–168.
Morris, J.T., P.V. Sundareshwar, C.T. Nietch, B. Kjerfve, and D.R. Cahoon. 2002. Responses of coastal wetlands to rising sea-level. Ecology 83: 2869–2877.
Morris, J.T., K. Sundberg, and C.S. Hopkinson. 2013. Salt marsh primary production and its responses to relative sea-level and nutrients in estuaries at Plum Island, Massachusetts, and North Inlet, South Carolina, USA. Oceanography 26: 78–84.
Newton, C., and C. Thornber. 2012. Abundance and species composition of surveys of macroalgal blooms in Rhode Island salt marshes. Northeastern Naturalist 19: 501–516.
Newton, C., and C. Thornber. 2013. Ecological impacts of macroalgal blooms on salt marsh communities. Estuaries and Coasts 36: 365–376.
Nixon, S.W. 1980. Between coastal marshes and coastal water—a review of twenty years of speculation and research in the role of salt marshes in estuarine productivity and water chemistry. In Wetland processes with emphasis on modeling, ed. P. Hamilton and K.B. MacDonald, 437–525. New York: Plenum Press.
Odum, E.P. 2000. Tidal marshes as outwelling/pulsing systems. In Concepts and controversies in tidal marsh ecology, ed. M.P. Weinstein and D.A. Kreeger, 3–8. Dordrecht: Kluwer Academic Publishers.
Sallenger, A.H., K.S. Doran, and P.A. Howd. 2012. Hotspot of accelerated sea-level rise on the Atlantic coast of North America. Nature Climate Change 2: 884–888.
Sprent, P. 1993. Applied nonparametric statistical methods. Boca Raton: Chapman & Hall.
Stevenson, J.C., M. Kearney, and E. Pendleton. 1985. Sedimentation and erosion in Chesapeake Bay brackish marsh system. Marine Geology 67: 213–235.
Teal, J.M. 1962. Energy flow in the salt marsh ecosystem of Georgia. Ecology 43: 614–624.
Teal, J.M., and B.L. Howes. 2000. Salt marsh values: retrospection from the end of the century. In Concepts and controversies in tidal marsh ecology, ed. M.P. Weinstein and D.A. Kreeger, 9–19. Dordrecht: Kluwer Academic Publishers.
Turner, R.E., B.L. Howes, J.M. Teal, C.S. Milan, E.M. Swenson, and D.D. Goehringer-Toner. 2009. Salt marshes and eutrophication: an unsustainable outcome. Limnology and Oceanography 54: 1634–1642.
Valiela, I., J.M. Teal, and N.Y. Persson. 1976. Production and dynamics of experimentally enriched salt marsh vegetation: belowground biomass. Limnology and Oceanography 21: 245–252.
Valiela, I., M.L. Cole, J. McClelland, J. Hauxwell, J. Cebrian, and S.B. Joye. 2000. Role of salt marshes as part of coastal landscapes. In Concepts and controversies in tidal marsh ecology, ed. M.P. Weinstein and D.A. Kreeger, 23–38. Dordrecht: Kluwer Academic Publishers.
Warren, R.S., and W.A. Niering. 1993. Vegetation change on a northeast tidal marsh: interaction of sea-level rise and marsh accretion. Ecology 74: 96–103.
Wasmund, N., I. Topp, and D. Schories. 2006. Optimizing the storage and extraction of chlorophyll samples. Oceanologica 48: 125–144.
Watson, E.B., C. Wigand, A.J. Oczkowski, K. Sundberg, D. Vendettuoli, S. Jayaraman, K. Saliba, J.T. Morris (In Review) Ulva amendments alter soil biogeochemistry and negatively impact Spartina alterniflora growth. Marine Ecology Progress Series.
Watson, E.B., A.J. Oczkowski, C. Wigand, A.R. Hanson, E.W. Davey, S.C. Crosby, and R.L. Johnson. 2014. Nutrient enrichment and precipitation changes do not enhance resiliency of salt marshes to sea level rise in the Northeastern U.S. Climate Change Letters 125: 501–509.
Wehner, M.F. 2004. Predicted twenty-first-century changes in seasonal extreme precipitation events in the parallel climate model. Journal of Climate 17: 4281–4290.
Wells, J.T. 1996. Subsidence, sea-level rise and wetland loss in the Lower Mississippi River Delta. In Sea-level rise and coastal subsidence, ed. J.D. Milliman and B.U. Haq, 281–311. Dordrecht: Kluwer.
Wigand, C., C.T. Roman, E.W. Davey, M.H. Stolt, R.L. Johnson, A. Hanson, E.B. Watson, S.B. Moran, D.R. Cahoon, J.C. Lynch, and P. Rafferty. 2014. Below the disappearing marshes of an urban estuary: historic nitrogen trends and soil structure. Ecological Applications 24: 633–649.
Wilsey, B.J., K.L. McKee, and I.A. Mendelssohn. 1992. Effects of increased elevation and macro- and micronutrient additions on Spartina alterniflora transplant success in salt-marsh dieback areas in Louisiana. Environmental Management 16: 505–511.
Yin, J., M.E. Schlesinger, and R.J. Stouffer. 2009. Model projections of rapid sea-level rise on the northeast coast of the United States. Nature Geoscience 2: 262–266.
Acknowledgments
We thank Earl Davey, Beth Watson, Joe Bishop, Gabrielle Sousa, Kirk Silver, Kevin Kelly, John Sardelli, Russ Ahlgren, Kristen Jones, Glen Thursby, and Chitanya Gopu for assistance with experiments. We also thank Patricia DeCastro for help creating Fig. 1. John Kiddon, Elizabeth Watson, and Rick McKinney provided helpful input on an earlier version of the manuscript. This report is contribution number ORD-008008 of the US EPA’s Office of Research and Development, National Health and Environmental Effects Research Laboratory, Atlantic Ecology Division. Although the information in this document has been funded by the US Environmental Protection Agency, it does not necessarily reflect the views of the agency and no official endorsement should be inferred. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
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Communicated by Wayne S. Gardner
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Oczkowski, A., Wigand, C., Hanson, A. et al. Nitrogen Retention in Salt Marsh Systems Across Nutrient-Enrichment, Elevation, and Precipitation Regimes: a Multiple-Stressor Experiment. Estuaries and Coasts 39, 68–81 (2016). https://doi.org/10.1007/s12237-015-9975-x
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DOI: https://doi.org/10.1007/s12237-015-9975-x