Arsenic speciation and susceptibility to oxidative stress in the fanworm Sabella spallanzanii (Gmelin) (Annelida, Sabellidae) under naturally acidified conditions: An in situ transplant experiment in a Mediterranean CO2 vent system

The fanworm Sabella spallanzanii (Gmelin, 1791) (Annelida, Sabellidae) is considered tolerant to several types of stressors but is generally absent from the CO2 vents. A peculiar characteristic of this species is the elevated content of arsenic in the gills, particularly dimethylarsinic acid (DMA),...

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Bibliographic Details
Published in:Science of The Total Environment
Main Authors: Ricevuto, E, Gambi, M. C., LANZONI, ILARIA, FATTORINI, DANIELE, REGOLI, Francesco
Other Authors: Lanzoni, Ilaria, Fattorini, Daniele, Regoli, Francesco
Format: Article in Journal/Newspaper
Language:English
Published: 2016
Subjects:
Antioxidant activity
Ocean acidification
Oxidative stre
Polychaete
Trace metal
Environmental Chemistry
Pollution
Waste Management and Disposal
Environmental Engineering
Online Access:http://hdl.handle.net/11566/234742
https://doi.org/10.1016/j.scitotenv.2015.11.154
Description
Summary:The fanworm Sabella spallanzanii (Gmelin, 1791) (Annelida, Sabellidae) is considered tolerant to several types of stressors but is generally absent from the CO2 vents. A peculiar characteristic of this species is the elevated content of arsenic in the gills, particularly dimethylarsinic acid (DMA), stored as an anti-predatory compound. In this study, modulation of trace metal levels, chemical speciation of arsenic and oxidative stress biomarkers were quantified in S. spallanzanii after a 30 days transplant experiment into naturally acidified conditions in a Mediterranean vent system. No significant bioaccumulation of metals was observed in the thoracic tissues and branchial crowns after the translocation period, whereas variations occurred in the relative abundance of different arsenic compounds with the appearance of inorganic forms. The antioxidant system of translocated polychaetes exhibited a significant decrease of enzymatic activities of both catalase and glutathione peroxidases, and the impairment of the overall capability to neutralize hydroxyl radicals (OH). This highlighted an oxidative challenge primarily on the detoxification pathway of hydrogen peroxide. Overall low pH-elevated pCO2 may have detrimental effects on arsenic metabolism and oxidative status of S. spallanzanii, supporting the hypothesis of species-specific differences in vulnerability to ocean acidification.

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