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An approach for identifying the causes of benthic degradation in Chesapeake Bay
Authors:Christman Cory S  Dauer Daniel M
Affiliation:(1) Department of Biological Sciences, Old Dominion University, Norfolk, VA, 23529
Abstract:We developed an index to differentiate between low dissolved oxygen effects and sediment contamination effects for sites classified as degraded by the Chesapeake Bay Benthic Index of Biotic Integrity (B-IBI), using discriminant analysis. We tested 126 metrics for differences between sites with low dissolved oxygen and sites with contaminated sediments. A total of 16 benthic community metrics met the variable selection criteria and were used to develop a discriminant function that classified degraded sites into one of two stress groups. The resulting discriminant function correctly classified 77% of the low dissolved oxygen sites and 80% of the contaminated sites in the validation data.
Keywords:discriminant analysis  index of biotic integrity  Chesapeake Bay  sediment contamination  low dissolved oxygen  macrobenthos
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