Data/hora: 07/06/2024 05:09:08

Provedor de dados: | 5
País: | France
Título: | Capacity of the potentially toxic diatoms Pseudo-nitzschia mannii and Pseudo-nitzschia hasleana to tolerate polycyclic aromatic hydrocarbons
Autores: | Ben Garali, Sondes Melliti; Sahraoui, Ines; Ben Othman, Hiba; Kouki, Abdessalem; De La Iglesia, Pablo; Diogene, Jorge; Lafabrie, Celine; Andree, Karl B.; Fernandez-tejedor, Margarita; Mejri, Kaouther; Meddeb, Marouan; Pringault, Olivier; Hlaili, Asma Sakka.
Data: | 2021-05
Ano: | 2021
Palavras-chave: | Diatoms; Pseudo-nitzschia; PAHs mixtures; Biodegradation; Eco-toxicology.
Resumo: | 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00690/80215/83300.pdf

DOI:10.1016/j.ecoenv.2021.112082

https://archimer.ifremer.fr/doc/00690/80215/

Editor: | Academic Press Inc Elsevier Science
Formato: | application/pdf
Fonte: | Ecotoxicology And Environmental Safety (0147-6513) (Academic Press Inc Elsevier Science), 2021-05 , Vol. 214 , P. 112082 (10p.)

Fonte:

info:eu-repo/semantics/openAccess

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