Capacity of the potentially toxic diatoms Pseudo-nitzschia mannii and Pseudo-nitzschia hasleana to tolerate polycyclic aromatic hydrocarbons
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Author
Melliti Ben Garali, Sondes
Sahraoui, Inès
Ben Othman, Hiba
Kouki, Abdessalem
de la Iglesia, Pablo
Lafabrie, Céline
Andree, Karl B.
Mejri, Kaouther
Meddeb, Marouan
Pringault, Olivier
Hlaili, Asma Sakka
Publication date
2021-03-12ISSN
0147-6513
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.
Document Type
Article
Document version
Published version
Language
English
Subject (CDU)
574 - General ecology and biodiversity
Pages
10
Publisher
Elsevier
Is part of
Ecotoxicology and Environmental Safety
Citation
Melliti Ben Garali, Sondes, Inès Sahraoui, Hiba Ben Othman, Abdessalem Kouki, Pablo de la Iglesia, Jorge Diogène, and Céline Lafabrie et al. 2021. "Capacity Of The Potentially Toxic Diatoms Pseudo-Nitzschia Mannii And Pseudo-Nitzschia Hasleana To Tolerate Polycyclic Aromatic Hydrocarbons". Ecotoxicology And Environmental Safety 214: 112082. doi:10.1016/j.ecoenv.2021.112082.
Program
Aigües Marines i Continentals
Aqüicultura
This item appears in the following Collection(s)
- ARTICLES CIENTÍFICS [2802]
Except where otherwise noted, this item's license is described as http://creativecommons.org/licenses/by-nc-nd/4.0/