Show simple item record

dc.creatorLuna-Acosta, A.
dc.creatorKanan, R.
dc.creatorLe Floch, S.
dc.creatorHuet, V.
dc.creatorPineau, P.
dc.creatorBustamante, P.
dc.creatorThomas-Guyon, H.
dc.date.accessioned2020-07-02T17:20:44Z
dc.date.available2020-07-02T17:20:44Z
dc.date.created2011
dc.identifier.issn0043-1354spa
dc.identifier.otherhttps://doi.org/10.1016/j.watres.2011.05.011spa
dc.identifier.urihttp://hdl.handle.net/20.500.12010/10268
dc.description.abstractThe aim of this study was to evaluate the effects of chemically dispersed oil on an economically and ecologically important species inhabiting coasts and estuaries, the Pacific oyster Crassostrea gigas. Studies were carried out with juveniles, known to generally be more sensitive to environmental stress than adults. A set of enzyme activities involved in immune defence mechanisms and detoxification processes, i.e. superoxide dismutase (SOD), catalase, glutathione peroxidase (GPx), catecholase-type phenoloxidase (PO), laccase-type PO and lysozyme were analysed in different oyster tissues, i.e. the gills, digestive gland and mantle, and in the plasma and the haemoycte lysate supernatant (HLS) of the haemolymph. Results indicated that total PAH body burdens were 2.7 times higher in the presence than in the absence of the chemical dispersant. After 2 days of exposure to chemically dispersed oil, alkylated naphthalenes accounted for 55% of the total PAH body burden, whereas alkylated fluorenes and alkylated dibenzothiophenes accounted for 80% when the chemical dispersant was absent. Importantly, a higher number of enzyme activities were modified when oil was chemically dispersed, especially in the plasma and gills. Moreover, independently of the presence or absence of chemical dispersant, oil exposure generally inhibited enzyme activities in the gills and plasma, while they were generally activated in the mantle and haemocytes. These results suggest that the gills and plasma constitute sensitive compartments in C. gigas, and that the mantle and haemocytes may play an important role in protection against xenobiotics. Among the six enzyme activities that were analysed in these body compartments, five were modulated in the chemical dispersion (CD) treatment while only half of the enzyme activities were modulated in the mechanical dispersion treatment. Furthermore, CD treatment effects were often observed following exposure, but also during depuration periods. These results suggest that immune and/or detoxification responses are likely to be affected when dispersants are used to treat oil spills in shallow waters.spa
dc.format.extent16 páginasspa
dc.format.mimetypeimage/jepgspa
dc.subjectChemical dispersionspa
dc.subjectOil spillspa
dc.subjectBivalvespa
dc.subjectDefence mechanismsspa
dc.subjectTissue-dependent responsespa
dc.titleEnhanced immunological and detoxification responses in Pacific oysters, Crassostrea gigas, exposed to chemically dispersed oilspa
dc.subject.lembOstras -- Investigacionesspa
dc.subject.lembInmunología -- Investigacionesspa
dc.subject.keywordBivalvespa
dc.identifier.doihttps://doi.org/10.1016/j.watres.2011.05.011spa


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record