1. Capacity of the potentially toxic diatoms Pseudo-nitzschia mannii and Pseudo-nitzschia hasleana to tolerate polycyclic aromatic hydrocarbons
- Author
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Asma Sakka Hlaili, Inès Sahraoui, Pablo de la Iglesia, Olivier Pringault, Hiba Ben Othman, Sondes Melliti Ben Garali, Kaouther Mejri, Karl B. Andree, Céline Lafabrie, Margarita Fernández-Tejedor, Abdessalem Kouki, Marouan Meddeb, Jorge Diogène, Université de Tunis El Manar (UTM), MARine Biodiversity Exploitation and Conservation (UMR MARBEC), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut méditerranéen d'océanologie (MIO), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Producció Animal, Aigües Marines i Continentals, and Aqüicultura
- Subjects
Health, Toxicology and Mutagenesis ,0211 other engineering and technologies ,02 engineering and technology ,010501 environmental sciences ,Photosynthesis ,01 natural sciences ,Environmental pollution ,Diatoms, Pseudo-nitzschia ,chemistry.chemical_compound ,GE1-350 ,14. Life underwater ,Polycyclic Aromatic Hydrocarbons ,Incubation ,Eco-toxicology ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Diatoms ,Pollutant ,021110 strategic, defence & security studies ,Kainic Acid ,Bacteria ,biology ,Public Health, Environmental and Occupational Health ,Domoic acid ,PAHs mixtures ,General Medicine ,Contamination ,Biodegradation ,biology.organism_classification ,Adaptation, Physiological ,Pollution ,Environmental sciences ,Biodegradation, Environmental ,TD172-193.5 ,chemistry ,13. Climate action ,Environmental chemistry ,Pseudo-nitzschia ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,Water Pollutants, Chemical - Abstract
This study investigates the effects of polycyclic aromatic hydrocarbons (PAHs) on two potentially toxic Pseudo-nitzschia hasleana and P. mannii, isolated from a PAH contaminated marine environment. Both species, maintained in non-axenic cultures, have been exposed during 144 h to increasing concentrations of a 15 PAHs mixture. Analysis of the domoic acid, showed very low concentrations. Dose–response curves for growth and photosynthesis inhibition were determined. Both species have maintained their growth until the end of incubation even at the highest concentration tested (120 µg l-1), Nevertheless, P mannii showed faster growth and seemed to be more tolerant than P. hasleana. To reduce PAH toxicity, both species have enhanced their biovolume, with a higher increase for P. mannii relative to P hasleana. Both species were also capable of bio-concentrating PAHs and were able to degrade them probably in synergy with their associated bacteria. The highest biodegradation was observed for P. mannii, which could harbored more efficient hydrocarbon-degrading bacteria. This study provides the first evidence that PAHs can control the growth and physiology of potentially toxic diatoms. Future studies should investigate the bacterial community associated with Pseudo-nitzschia species, as responses to pollutants or to other environmental stressors could be strongly influence by associated bacteria. info:eu-repo/semantics/publishedVersion
- Published
- 2021