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An estuarine benthic index of biotic integrity for the Mid-Atlantic region of the United States. II. Index development

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Abstract

A benthic index of biotic integrity was developed for use in estuaries of the mid-Atlantic region of the United States (Delaware Bay estuary through Albemarle-Pamlico Sound). The index was developed for the Mid-Atlantic Integrated Assessment Program (MAIA) of the U.S. Environmental Protection Agency using procedures similar to those applied previously in Chesapeake Bay and southeastern estuaries, and was based on sampling in July through early October. Data from seven federal and state sampling programs were used to categorize sites as degraded or non-degraded based on dissolved oxygen, sediment contaminant, and sediment toxicity criteria. Various metrics of benthic community structure and function that distinguished between degraded and reference (non-degraded) sites were selected for each of five major habitat types defined by classification analysis of assemblages. Each metric was scored according to thresholds established on the distribution of values at reference sites, so that sites with low scoring metrics would be expected to show signs of degradation. For each habitat, metrics that correctly classified at least 50% of the degraded sites in the calibration data set were selected whenever possible to derive the index. The final index integrated the average score of the combination of metrics that performed best according to several criteria. Selected metrics included measures of productivity (abundance), diversity (number of taxa, Shannon-Wiener diversity, percent dominance), species composition and life history (percent abundance of pollution-indicative taxa, percent abundance of pollution-sensitive taxa, percent abundance of Bivalvia, Tanypodinae-Chironomidae abundance ratio), and trophic composition (percent abundance of deep-deposit feeders). The index correctly classified 82% of all sites in an independent data set. Classification efficiencies of sites were higher in the mesohaline and polyhaline habitats (81–92%) than in the oligohaline (71%) and the tidal freshwater (61%). Although application of the index to low salinity habitats should be done with caution, the MAIA index appeared to be quite reliable with a high likelihood of correctly identifying both degraded and non-degraded conditions. The index is expected to be of great utility in regional assessments as a tool for evaluating the integrity of benthic assemblages and tracking their condition over time.

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Authors and Affiliations

  1. Versar, Inc., 9200 Rumsey Road, 21045-1934, Columbia, Maryland

    Roberto J. Llansó & Lisa C. Scott

  2. National Oceanic and Atmospheric Administration, National Ocean Service, 219 Fort Johnson Road, 29412-9110, Charleston, South Carolina

    Jeffrey L. Hyland

  3. Department of Biological Sciences, Old Dominion University, 23529, Norfolk, Virginia

    Daniel M. Dauer

  4. Environmental Science Center, U.S. Environmental Protection Agency, Region III, 701 Mapes Road, 20755-5350, Ft. Meade, Maryland

    David E. Russell & Frederick W. Kutz

Authors
  1. Roberto J. Llansó
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  2. Lisa C. Scott
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  3. Jeffrey L. Hyland
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  4. Daniel M. Dauer
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  5. David E. Russell
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  6. Frederick W. Kutz
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Correspondence to Roberto J. Llansó.

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Llansó, R.J., Scott, L.C., Hyland, J.L. et al. An estuarine benthic index of biotic integrity for the Mid-Atlantic region of the United States. II. Index development. Estuaries 25, 1231–1242 (2002). https://doi.org/10.1007/BF02692220

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