title: Use of the juvenile clam, Mercenaria mercenaria, as a sensitive indicator of aqueous and sediment toxicity.
abstract: The hard clam is an economically important bivalve and is abundant along the East Coast of the US. The goal of this research was to evaluate the sensitivity of this test species as compared to that of other benthic and epibenthic organisms. Toxic effects of cadmium (inorganic metal), DDT (organochlorine pesticide), and fluoranthene (polycyclic aromatic hydrocarbon) exposure in sediments (10-day) and seawater (24-h) on juvenile (212-350-microm) hard clams Mercenaria mercenaria were determined. The aqueous 24-h LC(50) values were 0.42 mg/L cadmium (95% CL=0.35-0.45 mg/L), 0.61 mg/L DDT (95% CL=0.40-0.95 mg/L), and 0.65 mg/L fluoranthene (95% CL=0.44-1.23 mg/L). Results of sediment toxicity tests indicated that the 10-day LC(50) values were 1.66 mg/kg cadmium (95% CL=1.21-2.28 mg/kg), 5.8 mg/kg DDT (95% CL=4.8-8.3mg/kg), and 1.75 mg/kg fluoranthene (95% CL=1.38-2.09 mg/kg). Based on comparisons to toxicity data for other marine species, these findings suggest that the juvenile clam is one of the more sensitive species to a variety of contaminants and may be a valuable indicator for potential sediment toxicity.
authors.affiliation: National Oceanic Atmospheric Administration/National Ocean Service/Center for Environmental Health and Biomolecular Research, 219 Fort Johnson Road, Charleston, SC 29412-9110, USA. katy.chung@noaa.gov
authors.forename: Katy W
authors.initials: KW
authors.lastname: Chung
authors.forename: Michael H
authors.initials: MH
authors.lastname: Fulton
authors.forename: Geoffrey I
authors.initials: GI
authors.lastname: Scott
mesh_terms: D000818:Animals; D001681:Biological Assay / Q000379:methods*; D002104:Cadmium / Q000493:pharmacokinetics / Q000633:toxicity; D003634:DDT / Q000493:pharmacokinetics / Q000633:toxicity; D004781:Environmental Exposure; D005449:Fluorenes / Q000493:pharmacokinetics / Q000633:toxicity; D019015:Geologic Sediments / Q000737:chemistry*; D007928:Lethal Dose 50; D049891:Mercenaria / Q000187:drug effects* / Q000502:physiology; D010575:Pesticides / Q000493:pharmacokinetics / Q000633:toxicity; D011084:Polycyclic Aromatic Hydrocarbons / Q000493:pharmacokinetics / Q000633:toxicity; D012623:Seawater; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000633:toxicity
chemical_list: D005449:Fluorenes; D010575:Pesticides; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D002104:Cadmium; D003634:DDT