Capacity of the potentially toxic diatoms Pseudo-nitzschia mannii and Pseudo-nitzschia hasleana to tolerate polycyclic aromatic hydrocarbons
|Author(s)||Ben Garali Sondes Melliti1, 2, Sahraoui Ines1, 2, Ben Othman Hiba1, Kouki Abdessalem3, de La Iglesia Pablo4, Diogene Jorge4, Lafabrie Celine5, Andree Karl B.4, Fernandez-Tejedor Margarita4, Mejri Kaouther1, 2, Meddeb Marouan1, 2, Pringault Olivier5, 6, Hlaili Asma Sakka1, 2|
|Affiliation(s)||1 : Univ Carthage, Fac Sci Bizerte, Lab Biol Vegetale & Phytoplanctonol, Bizerte, Tunisia.
2 : Univ Tunis El Manar, Fac Sci Tunis, Sci Environm Biol & Physiol Organismes Aquat LR18, Tunis, Tunisia.
3 : Univ Carthage, Fac Sci Bizerte, Lab Microscopie Elect & Microanal, Bizerte, Tunisia.
4 : Inst Rech & Technol Agroalimentaire IRTA, Ctra Poble Nou,Km 5-5, Tarragona 43540, Spain.
5 : Univ Montpellier, UMR 9190 MARBEC IRD, IFREMER, CNRS, Pl Eugene Bataillon,Case 093, F-34095 Montpellier 5, France.
6 : Univ Aix Marseille, Univ Toulon, CNRS, UMR MOI Inst Mediterraneen Oceanol 110,IRD, Marseille, France.
|Source||Ecotoxicology And Environmental Safety (0147-6513) (Academic Press Inc Elsevier Science), 2021-05 , Vol. 214 , P. 112082 (10p.)|
|WOS© Times Cited||1|
|Keyword(s)||Diatoms, Pseudo-nitzschia, PAHs mixtures, Biodegradation, Eco-toxicology|
This study investigates the effects of polycyclic aromatic hydrocarbons (PAHs) on two potentially toxic Pseudonitzschia 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 ?g 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 bioconcentrating 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.