Adaptive branchial mechanisms in the sturgeon Acipenser naccarii during acclimation to saltwater.
Identifieur interne : 000D83 ( Main/Curation ); précédent : 000D82; suivant : 000D84Adaptive branchial mechanisms in the sturgeon Acipenser naccarii during acclimation to saltwater.
Auteurs : Rosa M. Martínez-Alvarez [Espagne] ; Ana Sanz ; Manuel García-Gallego ; Alberto Domezain ; Julio Domezain ; Ram N Carmona ; M. Del Valle Ostos-Garrido ; Amalia E. MoralesSource :
- Comparative biochemistry and physiology. Part A, Molecular & integrative physiology [ 1095-6433 ] ; 2005.
English descriptors
- KwdEn :
- Acclimatization (physiology), Animals, Fatty Acids (metabolism), Fishes (blood), Fishes (physiology), Fresh Water, Gills (physiology), Gills (ultrastructure), Microscopy, Electron, Transmission, Osmolar Concentration, Seawater, Sodium-Potassium-Exchanging ATPase (physiology), Water-Electrolyte Balance (physiology).
- MESH :
- chemical , metabolism : Fatty Acids.
- blood : Fishes.
- physiology : Acclimatization, Fishes, Gills, Sodium-Potassium-Exchanging ATPase, Water-Electrolyte Balance.
- ultrastructure : Gills.
- Animals, Fresh Water, Microscopy, Electron, Transmission, Osmolar Concentration, Seawater.
Abstract
Variations of Na(+)/K(+)-ATPase activity and fatty-acid composition in the gills of the sturgeon Acipenser naccarii subjected to progressive acclimation to full seawater (35 ppt) were determined in relation to the hypo-osmoregulatory capacity of this species in the hyperosmotic medium. Blood samples were taken and gills arches were removed at intermediate salinity levels between 0 and 35 ppt and after 20 days at constant salinity (35 ppt). Plasma osmolality and Na(+)/K(+)-ATPase activity increased significantly with growing environmental salinity. Total saturated fatty acids (SFAs) decreased, while total polyunsaturated fatty acids (PUFAs) increased significantly with increasing salinity due mainly to changes in n-3 PUFAs (20:5n-3 and 22:6n-3). The n-3/n-6 ratio increased significantly during the acclimation process. The results show a direct relationship between salinity, increased gill Na(+)/K(+)-ATPase activity and ultrastructural changes of the gill chloride cells. Changes in the fatty-acid composition in gills of A. naccarii during progressive acclimation to full seawater suggest that variations of gill fatty acids may also have a role in osmoregulatory mechanisms.
DOI: 10.1016/j.cbpb.2005.05.003
PubMed: 15955717
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pubmed:15955717Le document en format XML
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<front><div type="abstract" xml:lang="en">Variations of Na(+)/K(+)-ATPase activity and fatty-acid composition in the gills of the sturgeon Acipenser naccarii subjected to progressive acclimation to full seawater (35 ppt) were determined in relation to the hypo-osmoregulatory capacity of this species in the hyperosmotic medium. Blood samples were taken and gills arches were removed at intermediate salinity levels between 0 and 35 ppt and after 20 days at constant salinity (35 ppt). Plasma osmolality and Na(+)/K(+)-ATPase activity increased significantly with growing environmental salinity. Total saturated fatty acids (SFAs) decreased, while total polyunsaturated fatty acids (PUFAs) increased significantly with increasing salinity due mainly to changes in n-3 PUFAs (20:5n-3 and 22:6n-3). The n-3/n-6 ratio increased significantly during the acclimation process. The results show a direct relationship between salinity, increased gill Na(+)/K(+)-ATPase activity and ultrastructural changes of the gill chloride cells. Changes in the fatty-acid composition in gills of A. naccarii during progressive acclimation to full seawater suggest that variations of gill fatty acids may also have a role in osmoregulatory mechanisms.</div>
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