[Isotopic composition of the delta-18O--delta-13C from the otoliths of reef fish from Taiaro (Tuamotu, French Polynesia): isotopic and biological implications].
Nuclei (larval stage) and outer parts (adult stage) of fish otoliths from the Taiaro closed lagoon (French Polynesia) and adjacent ocean have been analysed for the C-O isotopic compositions. delta 18O values of the nuclei of both populations indicate that isotopic equilibrium is reached. This implies that the lagoonal fish population has done its complete biological cycle in the lagoon and represents an adaptation in a closed system. delta 18O values of the outer parts show a slight isotopic disequilibrium (< 0.2@1000) interpreted in term of vital effect. All the delta 13C values exhibit a strong isotopic disequilibrium related to metabolic activity.
Blamart
Dominique
D
Laboratoire des sciences du climat et de l'environnement, unité mixte CEA-CNRS, Bât. 12, av. de la Terrasse, 91198 Gif-sur-Yvette, France. Dominique.Blamart@lsce.cnrs-gif.fr
Escoubeyrou
Karine
K
Juillet-Leclerc
Anne
A
Ouahdi
Rabia
R
Lecomte-Finiger
Raymonde
R
D000818:Animals; D002119:Calcium Carbonate / Q000737:chemistry*; D002247:Carbon Isotopes / Q000032:analysis*; D004032:Diet; D004423:Ear / Q000254:growth & development; D005399:Fishes / Q000254:growth & development / Q000378:metabolism*; D005618:Fresh Water; D007814:Larva; D008018:Life Cycle Stages; D010037:Otolithic Membrane / Q000737:chemistry*; D010103:Oxygen Isotopes / Q000032:analysis*; D010473:Perciformes / Q000254:growth & development / Q000378:metabolism; D011114:Polynesia; D012623:Seawater; D013045:Species Specificity; D013696:Temperature
D002247:Carbon Isotopes; D010103:Oxygen Isotopes; D002119:Calcium Carbonate