title: Baseline ecological risk assessment of the Calcasieu Estuary, Louisiana: Part 2. An evaluation of the predictive ability of effects-based sediment-quality guidelines.
abstract: Three sets of effects-based sediment-quality guidelines (SQGs) were evaluated to support the selection of sediment-quality benchmarks for assessing risks to benthic invertebrates in the Calcasieu Estuary, Louisiana. These SQGs included probable effect concentrations (PECs), effects range median values (ERMs), and logistic regression model (LRMs)-based T₅₀ values. The results of this investigation indicate that all three sets of SQGs tend to underestimate sediment toxicity in the Calcasieu Estuary (i.e., relative to the national data sets), as evaluated using the results of 10-day toxicity tests with the amphipod, Hyalella azteca, or Ampelisca abdita, and 28-day whole-sediment toxicity tests with the H. azteca. These results emphasize the importance of deriving site-specific toxicity thresholds for assessing risks to benthic invertebrates.
authors: MacDonald Environmental Sciences Ltd, #24-4800 Island Highway North, Nanaimo, BC V9T1W6, Canada. mesl@shaw.ca
authors: Donald D
authors: DD
authors: MacDonald
authors: Christopher G
authors: CG
authors: Ingersoll
authors: Dawn E
authors: DE
authors: Smorong
authors: Jesse A
authors: JA
authors: Sinclair
authors: Rebekka
authors: R
authors: Lindskoog
authors: Ning
authors: N
authors: Wang
authors: Corrine
authors: C
authors: Severn
authors: Ron
authors: R
authors: Gouguet
authors: John
authors: J
authors: Meyer
authors: Jay
authors: J
authors: Field
mesh_terms: D000818:Animals; D059001:Aquatic Organisms / Q000187:drug effects*; D017753:Ecosystem; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007448:Invertebrates / Q000187:drug effects*; D016015:Logistic Models; D008145:Louisiana; D018570:Risk Assessment; D045483:Rivers / Q000737:chemistry*; D018675:Toxicity Tests; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D014874:Water Pollutants, Chemical