Riou Virginie, Ndiaye A., Budzinski H., Dugué Rémi, Le Menach K., Combes Y., Bossus M., Durand Jean-Dominique, Charmantier G., Lorin-Nebel C. (2012). Impact of environmental DDT concentrations on gill adaptation to increased salinity in the tilapia Sarotherodon melanotheron. Comparative Biochemistry and Physiology C : Toxicology and Pharmacology, 156 (1), p. 7-16. ISSN 1532-0456.
Titre du document
Impact of environmental DDT concentrations on gill adaptation to increased salinity in the tilapia Sarotherodon melanotheron
Année de publication
2012
Auteurs
Riou Virginie, Ndiaye A., Budzinski H., Dugué Rémi, Le Menach K., Combes Y., Bossus M., Durand Jean-Dominique, Charmantier G., Lorin-Nebel C.
Source
Comparative Biochemistry and Physiology C : Toxicology and Pharmacology, 2012,
156 (1), p. 7-16 ISSN 1532-0456
Estuaries of tropical developing countries suffering from severe droughts induced by climate change are habitats to fish, which face drastic salinity variations and the contact with pollutants. The Western Africa tilapia Sarotherodon melanotheron is highly resistant to hypersalinity, but the effect of human-released xenobiotics on its adaptation is barely known. Controlled experiments were conducted to observe S. melanotheron gill adaptation to abrupt salinity variations in the presence of waterborne DDT, at concentrations detected in their natural habitat. The gills appeared as an important site of DDT conversion to DDD and/or depuration. A 12-days DDT exposure resulted in decreased gill epithelium thickness at all salinities (from fresh- to hypersaline-water), and the structure of gills from freshwater fish was particularly altered, relative to controls. No unbalance in tilapia blood osmolality was observed following DDT exposure, which however caused a decrease in branchial Na+-K+-ATPase (NKA) activity. Gill cellular NKA expression was reduced in salt-water, together with the expression of the CFTR chloride channel in hypersaline water. Although S. melanotheron seems very resistant (especially in seawater) to short-term waterborne DDT contamination, the resulting alterations of the gill tissue, cells and enzymes might affect longer term respiration, toxicant depuration and/or osmoregulation in highly fluctuating salinities.
Plan de classement
Limnologie biologique / Océanographie biologique [034]
;
Pollution [038]
Localisation
Fonds IRD [F B010055935]
Identifiant IRD
PAR00009008
