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Southern California Bight 2003 Regional Monitoring Program: I. Sediment Toxicity

The sediment toxicity assessment program of the Southern California Bight 1998 Regional Monitoring Survey (Bight ’98) was a coordinated effort with seven laboratories sharing the responsibility for conducting 10-d amphipod tests (Eohaustorius estuarius). An interlaboratory comparison exercise was conducted prior to testing Bight ’98 field samples. In order to assess laboratory performance with samples collected in the field, sediments from four stations in Los Angeles/Long Beach Harbor were tested along with the animal collection site control. All laboratories successfully performed the sediment test and associated reference toxicant test. Statistically significant differences in amphipod mean survival were found among some laboratories for the field-collected sediments. However, precision of the results did not appear to be reduced by having multiple laboratories participate in the testing. The laboratories demonstrated excellent concordance (Kendall’s W = 0.91) in ranking the field-collected sediments by toxicity. Agreement on classifying the sediments into the Bight ’98 toxicity categories (not toxic, moderately toxic, highly toxic) was good for sediments with mean survival values that differed sufficiently from the threshold.