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Coastal Studies in Maine

Tools to predict and monitor effects of nutrient enrichment of estuaries at Acadia National Park

Many estuaries in the northeast are threatened by nutrient over-enrichment and consequent eutrophication, with resulting losses of biological diversity and habitat value. At Acadia National Park, excessive nutrient loading of coastal systems is one of the most significant resource management challenges. Baseline investigations have highlighted the susceptibility of Park estuaries to nutrient inputs and the threats posed by rapidly increasing residential development outside the Park boundary. Protecting estuarine resources from continued nutrient inputs requires the ability to predict responses to potential increases in nutrient loading resulting from changing land-use patterns and to detect early changes in estuarine status.

This project is focusing on a small, Ruppia (widgeon grass) dominated system at Acadia National Park, the Northeast Creek Estuary, using an interdisciplinary approach at a variety of temporal and spatial scales. Overall project goals are to link land use to nutrient loading and ecological responses and to adept a scientifically based estuarine monitoring program to local conditions. The following specific objectives are being addressed in 2000-2003:

  • Determine magnitudes of nutrient loading to the Northeast Creek system from surface water, ground water, tidal, and atmospheric sources;
  • Measure landscape characteristics within the watershed and relate them to nutrient flux;
  • Use in situ enrichment experiments to determine critical thresholds of nutrient loading that result in changes in estuarine structure and function;
  • Test the sensitivity and variability of various indicators for detecting early signs of ecosystem degradation.
  • This project will develop tools that resource managers can use to assess and predict changes in estuarine status related to nutrient loads.   Specific products include the following:

  • A GIS-based decision support system linking estuarine ecosystem responses to changes in nutrient loads associated with changes in land use within the watershed.   This system will enable managers to predict likely estuarine responses to changing patterns of residential development.
  • A suite of indicators of eutrophication and a recommended sampling program for incorporation in an estuarine monitoring program.
  • Northeast Creek Estuary, Acadia National Park
    Northeast Creek Estuary, Acadia National Park

    U.S. Department of the Interior, U.S. Geological Survey
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    Last modified: Thursday, 27-Mar-2003 13:40:37 EST
    URL: http://me.water.usgs.gov./monitoranp.html
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