Adaptive branchial mechanisms in the sturgeon Acipenser naccarii during acclimation to saltwater.
Identifieur interne : 000E27 ( Main/Merge ); précédent : 000E26; suivant : 000E28Adaptive 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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Martínez-Alvarez</name><affiliation wicri:level="4"><nlm:affiliation>Dpt. de Biología Animal y Ecología, Facultad de Ciencias, Universidad de Granada, Spain.</nlm:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Dpt. de Biología Animal y Ecología, Facultad de Ciencias, Universidad de Granada</wicri:regionArea><placeName><settlement type="city">Grenade (Espagne)</settlement><region nuts="2" type="region">Andalousie</region></placeName><orgName type="university">Université de Grenade</orgName></affiliation></author><author><name sortKey="Sanz, Ana" sort="Sanz, Ana" uniqKey="Sanz A" first="Ana" last="Sanz">Ana Sanz</name></author><author><name sortKey="Garcia Gallego, Manuel" sort="Garcia Gallego, Manuel" uniqKey="Garcia Gallego M" first="Manuel" last="García-Gallego">Manuel García-Gallego</name></author><author><name sortKey="Domezain, Alberto" sort="Domezain, Alberto" uniqKey="Domezain A" first="Alberto" last="Domezain">Alberto Domezain</name></author><author><name sortKey="Domezain, Julio" sort="Domezain, Julio" uniqKey="Domezain J" first="Julio" last="Domezain">Julio Domezain</name></author><author><name sortKey="Carmona, Ram N" sort="Carmona, Ram N" uniqKey="Carmona R" first="Ram N" last="Carmona">Ram N Carmona</name></author><author><name sortKey="Del Valle Ostos Garrido, M" sort="Del Valle Ostos Garrido, M" uniqKey="Del Valle Ostos Garrido M" first="M" last="Del Valle Ostos-Garrido">M. Del Valle Ostos-Garrido</name></author><author><name sortKey="Morales, Amalia E" sort="Morales, Amalia E" uniqKey="Morales A" first="Amalia E" last="Morales">Amalia E. 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Martínez-Alvarez</name><affiliation wicri:level="4"><nlm:affiliation>Dpt. de Biología Animal y Ecología, Facultad de Ciencias, Universidad de Granada, Spain.</nlm:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Dpt. de Biología Animal y Ecología, Facultad de Ciencias, Universidad de Granada</wicri:regionArea><placeName><settlement type="city">Grenade (Espagne)</settlement><region nuts="2" type="region">Andalousie</region></placeName><orgName type="university">Université de Grenade</orgName></affiliation></author><author><name sortKey="Sanz, Ana" sort="Sanz, Ana" uniqKey="Sanz A" first="Ana" last="Sanz">Ana Sanz</name></author><author><name sortKey="Garcia Gallego, Manuel" sort="Garcia Gallego, Manuel" uniqKey="Garcia Gallego M" first="Manuel" last="García-Gallego">Manuel García-Gallego</name></author><author><name sortKey="Domezain, Alberto" sort="Domezain, Alberto" uniqKey="Domezain A" first="Alberto" last="Domezain">Alberto Domezain</name></author><author><name sortKey="Domezain, Julio" sort="Domezain, Julio" uniqKey="Domezain J" first="Julio" last="Domezain">Julio Domezain</name></author><author><name sortKey="Carmona, Ram N" sort="Carmona, Ram N" uniqKey="Carmona R" first="Ram N" last="Carmona">Ram N Carmona</name></author><author><name sortKey="Del Valle Ostos Garrido, M" sort="Del Valle Ostos Garrido, M" uniqKey="Del Valle Ostos Garrido M" first="M" last="Del Valle Ostos-Garrido">M. Del Valle Ostos-Garrido</name></author><author><name sortKey="Morales, Amalia E" sort="Morales, Amalia E" uniqKey="Morales A" first="Amalia E" last="Morales">Amalia E. Morales</name></author></analytic><series><title level="j">Comparative biochemistry and physiology. Part A, Molecular & integrative physiology</title><idno type="ISSN">1095-6433</idno><imprint><date when="2005" type="published">2005</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acclimatization (physiology)</term><term>Animals</term><term>Fatty Acids (metabolism)</term><term>Fishes (blood)</term><term>Fishes (physiology)</term><term>Fresh Water</term><term>Gills (physiology)</term><term>Gills (ultrastructure)</term><term>Microscopy, Electron, Transmission</term><term>Osmolar Concentration</term><term>Seawater</term><term>Sodium-Potassium-Exchanging ATPase (physiology)</term><term>Water-Electrolyte Balance (physiology)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Fatty Acids</term></keywords><keywords scheme="MESH" qualifier="blood" xml:lang="en"><term>Fishes</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Acclimatization</term><term>Fishes</term><term>Gills</term><term>Sodium-Potassium-Exchanging ATPase</term><term>Water-Electrolyte Balance</term></keywords><keywords scheme="MESH" qualifier="ultrastructure" xml:lang="en"><term>Gills</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Animals</term><term>Fresh Water</term><term>Microscopy, Electron, Transmission</term><term>Osmolar Concentration</term><term>Seawater</term></keywords></textClass></profileDesc></teiHeader><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></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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