title: Effects of spill-treating agents on growth kinetics of marine microalgae.
abstract: The effects of four spill-treating agents (STAs) (CytoSol, Finasol(®) OSR 51, Agma OSD 569 and OD4000) on the growth kinetics of three marine microalgae (Isochrysis galbana, Chaetoceros gracilis, Phaeodactylum tricornutum) were studied. Chlorophyll a concentration and optical density at 700 nm were assessed to describe the logistic growth of algae in batch cultures. The optical density data were initially analyzed as described for standard algal growth inhibition tests and subsequently modelled by a bivariate model, as a function of time and dose, to assess the toxic effects on growth parameters. Increasing trends in EC50 and EC10 values with time were found with the standard approach. In 8 of the 11 tests, the lag phase (λ) or the time required to achieve half the maximum biomass (τ) was significantly dependent on the STA concentration. A global parameter (EC50,τ) was calculated to summarize the effects of STAs on growth parameters in the bivariate model. The ranking of sensitivity as EC50,τ values was I. galbana>C. gracilis>P. tricornutum. For all species tested, the least toxic agent was Agma OSD 569, followed by CytoSol. The mathematical model allowed successful ecotoxicological evaluation of chemicals on microalgal growth.
authors.affiliation: Grupo de Reciclado y Valorización de Materiales Residuales (REVAL), Instituto de Investigacións Mariñas (CSIC), r/Eduardo Cabello, 6, Vigo 36208, Galicia, Spain. Electronic address: diegorialconde@uvigo.es.
authors.forename: Diego
authors.initials: D
authors.lastname: Rial
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Murado
authors.forename: Araceli
authors.initials: A
authors.lastname: Menduiña
authors.forename: Pablo
authors.initials: P
authors.lastname: Fuciños
authors.forename: Pilar
authors.initials: P
authors.lastname: González
authors.forename: Jesús
authors.initials: J
authors.lastname: Mirón
authors.forename: José A
authors.initials: JA
authors.lastname: Vázquez
mesh_terms: D001673:Biodegradation, Environmental; D001681:Biological Assay; D018533:Biomass; D002734:Chlorophyll / Q000032:analysis*; D000077194:Chlorophyll A; D005648:Fuel Oils / Q000032:analysis*; D058087:Haptophyta / Q000378:metabolism*; D007700:Kinetics; D058086:Microalgae / Q000737:chemistry* / Q000378:metabolism; D008962:Models, Theoretical; D010858:Pigmentation; D015203:Reproducibility of Results; D012623:Seawater; D012822:Silicon Dioxide; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005648:Fuel Oils; D014874:Water Pollutants, Chemical; C007886:granite; D002734:Chlorophyll; D012822:Silicon Dioxide; D000077194:Chlorophyll A
keywords: Algae growth kinetics; EC(50); Spill-treating agents; Toxicological end-points; Weibull and logistic equations