title: Toxicity of selenomethionine- and seleno-contaminated sediment to the amphipod Corophium sp.
abstract: The acute toxicity of four chemical species of selenium to juvenile amphipods (Corophium sp.) was assessed in water-only tests. The seleno-amino acid compounds seleno-L-methionine and seleno-DL-cystine were found to be more toxic (96-h LC(50) values of 1.5 and 12.7 microg Se/L) than the inorganic selenite and selenate (96-h NOEC values of 58 and 116 microg Se/L). New marine sediment testing procedures were developed using juvenile and adult Corophium sp. Both life stages were highly sensitive to seleno-L-methionine-spiked sediment. The juveniles were approximately five times more sensitive, with a 10-day LC(50) of 1.6 microg Se/g (dry weight) compared to 7.6 microg Se/g (dry weight) for the adults. Sediment collected from three sites in Lake Macquarie, a marine barrier lagoon with elevated concentrations of total selenium, had no effect on the survival of adult Corophium over 10 days. The toxicity of seleno-L-methionine to other amphipod species occurring in Lake Macquarie was assessed in water-only tests, with Paracalliope australis being highly sensitive (96-h LC(50) 2.58 microg Se/L).
authors.affiliation: Ecotoxicology Section, Environment Protection Authority, New South Wales, Centre for Ecotoxicology, University of Technology-Sydney, Westbourne Street, Gore Hill, New South Wales 2065, Australia. hyner@epa.nsw.goc.au
authors.forename: Ross V
authors.initials: RV
authors.lastname: Hyne
authors.forename: Alicia C
authors.initials: AC
authors.lastname: Hogan
authors.forename: Fleur
authors.initials: F
authors.lastname: Pablo
authors.forename: Anthony C
authors.initials: AC
authors.lastname: Roach
mesh_terms: D000818:Animals; D003445:Crustacea; D004781:Environmental Exposure; D019015:Geologic Sediments / Q000737:chemistry; D007928:Lethal Dose 50; D012643:Selenium / Q000737:chemistry / Q000633:toxicity*; D012645:Selenomethionine / Q000633:toxicity*; D014873:Water Pollutants / Q000633:toxicity*
chemical_list: D014873:Water Pollutants; D012645:Selenomethionine; D012643:Selenium