title: The combined effect of dissolved organic carbon and salinity on the bioaccumulation of copper in marine mussel larvae.
abstract: Larvae of Mytilus spp. are among the most Cu sensitive marine species. In this study we assessed the combined effect of salinity and dissolved organic carbon (DOC) on Cu accumulation on mussel larvae. Larvae were exposed for 48 h to three Cu concentrations in each of nine salinity/DOC treatments. Synchrotron radiation X-ray fluorescence was used to determine the Cu concentration in 36 individual larvae with a spatial resolution of 10 × 10 μm. Cu body burden concentrations varied between 1.1 and 27.6 μg/g DW larvae across all treatments and Cu was homogeneously distributed at this spatial resolution level. Our results indicate decreasing Cu accumulation with increasing DOC concentrations which can be explained by an increase in Cu complexation. In contrast, salinity had a nonlinear effect on Cu. This cannot be explained by copper speciation or competition processes and suggests a salinity-induced alteration in physiology.
authors.affiliation: Laboratory of Environmental Toxicology and Aquatic Ecology, Department of Applied Ecology and Environmental Biology, Ghent University , Jozef Plateaustraat 22, B-9000 Gent, Belgium.
authors.forename: David
authors.initials: D
authors.lastname: Deruytter
authors.forename: Jan
authors.initials: J
authors.lastname: Garrevoet
authors.forename: Michiel B
authors.initials: MB
authors.lastname: Vandegehuchte
authors.forename: Eva
authors.initials: E
authors.lastname: Vergucht
authors.forename: Björn
authors.initials: B
authors.lastname: De Samber
authors.forename: Bart
authors.initials: B
authors.lastname: Vekemans
authors.forename: Karen
authors.initials: K
authors.lastname: Appel
authors.forename: Gerald
authors.initials: G
authors.lastname: Falkenberg
authors.forename: Katrien
authors.initials: K
authors.lastname: Delbeke
authors.forename: Ronny
authors.initials: R
authors.lastname: Blust
authors.forename: Karel A C
authors.initials: KA
authors.lastname: De Schamphelaere
authors.forename: Laszlo
authors.initials: L
authors.lastname: Vincze
authors.forename: Colin R
authors.initials: CR
authors.lastname: Janssen
mesh_terms: D000818:Animals; D059001:Aquatic Organisms; D002244:Carbon / Q000032:analysis; D003300:Copper / Q000493:pharmacokinetics*; D004625:Embryo, Nonmammalian / Q000187:drug effects; D007814:Larva / Q000187:drug effects / Q000378:metabolism; D049878:Mytilus / Q000187:drug effects / Q000196:embryology / Q000378:metabolism*; D054712:Salinity; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D017356:Synchrotrons; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics*
chemical_list: D014874:Water Pollutants, Chemical; D002244:Carbon; D003300:Copper