The importance of benthos in weight of evidence sediment assessments — A case study

• Published in: The Science of the total environment Vol. 394; no. 2; pp. 252 - 264
• Main Authors: McPherson, Cathy, Chapman, Peter M., deBruyn, Adrian M.H., Cooper, Leah
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier B.V 15.05.2008; [Amsterdam; New York]: Elsevier Science; Elsevier Science
• Subjects: Amphipoda; Amphipoda - drug effects; Amphipoda - growth & development; analysis; Animal, plant and microbial ecology; Animals; Applied ecology; benthic organisms; Benthos; Biological and medical sciences; chemical analysis; Chemical contamination; Chironomidae; Chironomidae - drug effects; Chironomidae - growth & development; community structure; drug effects; ecotoxicology; Ecotoxicology, biological effects of pollution; Environmental Monitoring; Environmental Monitoring - methods; Fresh Water; Freshwater; Fundamental and applied biological sciences. Psychology; General aspects; Geologic Sediments; Geologic Sediments - analysis; growth & development; heavy metals; Metals; Metals - analysis; Metals - toxicity; methods; Pesticides; Pesticides - analysis; Pesticides - toxicity; Phthalic Acids; Phthalic Acids - analysis; Phthalic Acids - toxicity; Polychlorinated Biphenyls; Polychlorinated Biphenyls - analysis; Polychlorinated Biphenyls - toxicity; Polycyclic Aromatic Hydrocarbons; Polycyclic Aromatic Hydrocarbons - analysis; Polycyclic Aromatic Hydrocarbons - toxicity; reservoirs; sediment contamination; Sediment Quality Triad; Sediment toxicity; Texas; toxicity; toxicity testing; Water Pollutants, Chemical; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - toxicity; Weight of evidence; Texas; USA, Texas; Benthos; Sediment toxicity; Sediment Quality Triad; Weight of evidence; Chemical contamination; Case study; Ecotoxicology; Toxicity; Quality; Triad; Sediments
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2008.01.027

Sediment quality in a Texas reservoir subject to point and non-point sources of contaminants was assessed using the Sediment Quality Triad weight of evidence approach. Fifteen stations were sampled plus a reference station which, unfortunately, comprised a different habitat type than the other 15 stations. Accordingly, standard comparisons between reference and exposed stations were inappropriate. Interpretation of potential relationships between benthic community structure and sediment-associated contaminants was also confounded by differences in habitat-related characteristics (e.g., water depth and total organic carbon) within the reservoir. Multivariate analyses of the benthic community identified two station groupings separated primarily by habitat-related differences rather than contaminant-related toxicity. Laboratory toxicity tests and chemical analyses, including measures of bioavailability, did not differ consistently between the two community-based station groupings, indicating that toxicity resulting from chemical contamination was not the primary factor in observed community structure in the reservoir, although alterations to the benthos due to chemical contamination could not be ruled out in the absence of an appropriate reference comparison. Appropriately giving highest weight to resident benthic community structure, followed by the results of laboratory toxicity tests, then chemical analyses, provided the best possible assessment of chemical pollution in the absence of a suitable reference comparison. The alternative approach of relying on only sediment toxicity and chemistry data, without considering the full weight of evidence, would have provided misleading information.