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Effects of copper and butyltin compounds on the growth, photosynthetic activity and toxin production of two HAB dinoflagellates: The planktonic Alexandrium catenella and the benthic Ostreopsis cf. ovata.
- Source :
-
Aquatic toxicology (Amsterdam, Netherlands) [Aquat Toxicol] 2018 Mar; Vol. 196, pp. 154-167. Date of Electronic Publication: 2018 Jan 06. - Publication Year :
- 2018
-
Abstract
- Controlled laboratory experiments were conducted to test the effects of copper (Cu <superscript>2+</superscript> ) and butyltins (BuT) on the growth, photosynthetic activity and toxin content of two HABs (Harmful Algal Blooms) dinoflagellates, the planktonic Alexandrium catenella and the benthic Ostreopsis cf. ovata. Microalgae were exposed to increasing concentrations of Cu <superscript>2+</superscript> (10 <superscript>-4</superscript> to 31 nM) or BuT (0.084 to 84 nM) for seven days. When considering the growth, EC <subscript>50</subscript> values were 0.16 (±0.09) nM and 0.03 (±0.02) nM of Cu <superscript>2+</superscript> for A. catenella and O. cf. ovata, respectively. Regarding BuT, EC <subscript>50</subscript> was 14.2 (±6) nM for O. cf. ovata, while A. catenella growth inhibition appeared at BuT concentrations ≥27 nM. Photosynthetic activity of the studied dinoflagellates decreased with increasing Cu and BuT concentrations. For O. cf. ovata, the response of this physiological parameter to contamination was less sensitive than the biomass. Cu exposure induced the formation of temporary cysts in both organisms that could resist adverse conditions. The ovatoxin-a and -b concentrations in O. cf. ovata cells increased significantly in the presence of Cu. Altogether, the results suggest a better tolerance of the planktonic A. catenella to Cu and BuT. This could result in a differentiated selection pressure exerted by these metals on phytoplankton species in highly polluted waters. The over-production of toxins in response to Cu stress could pose supplementary health and socio-economic threats in the contaminated marine ecosystems where HABs develop.<br /> (Copyright © 2018 Elsevier B.V. All rights reserved.)
- Subjects :
- Biomass
Dinoflagellida growth & development
Dinoflagellida metabolism
Marine Toxins metabolism
Microalgae drug effects
Microalgae metabolism
Plankton drug effects
Plankton metabolism
Water Pollutants, Chemical chemistry
Copper toxicity
Dinoflagellida drug effects
Organotin Compounds toxicity
Photosynthesis drug effects
Water Pollutants, Chemical toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1514
- Volume :
- 196
- Database :
- MEDLINE
- Journal :
- Aquatic toxicology (Amsterdam, Netherlands)
- Publication Type :
- Academic Journal
- Accession number :
- 29407801
- Full Text :
- https://doi.org/10.1016/j.aquatox.2018.01.005