title: Comparison of porewater and elutriate bivalve larval development toxicity testing in a sediment quality triad framework.
abstract: Concurrent porewater (PW) and elutriate (ELU) toxicity testing using newly fertilized larvae of the bivalve Mytilus galloprovincialis was conducted as part of sediment quality triad (SQT) investigations for urban harbor locations. PW samples were consistently more toxic to bivalve larvae than the corresponding ELU sample, including samples collected from uncontaminated reference locations. Ammonia was identified as the most likely toxic agent. EC(20) and EC(50) values of 0.028 and 0.036mg/L un-ionized N, respectively, were determined for M. galloprovincialis. The limitations of incorporating PW bivalve larval development toxicity tests using M. galloprovincialis for routine SQT investigations, as well as possible alternative methods, are discussed.
authors.affiliation: Golder Associates Ltd., 195 Pemberton Avenue, North Vancouver, BC, Canada V7P 2R4. bgmcdonald@golder.com
authors.forename: Blair G
authors.initials: BG
authors.lastname: McDonald
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000633:toxicity; D000818:Animals; D005260:Female; D019015:Geologic Sediments / Q000737:chemistry; D007814:Larva / Q000187:drug effects / Q000254:growth & development; D008297:Male; D008670:Metals / Q000032:analysis / Q000633:toxicity; D049878:Mytilus / Q000187:drug effects* / Q000254:growth & development; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000633:toxicity; D016062:Porosity; D012623:Seawater; D018675:Toxicity Tests / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*
chemical_list: D008670:Metals; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D000641:Ammonia