TY  - JOUR
AU  - Mayzaud P, Chevallier J.
PY  - 2011//
TI  - Lipid composition of the Antarctic fish Pleuragramma antarcticum. Influence of age class
JO  - Polar Science
SP  - 264
EP  - 271
VL  - 5
IS  - 2
KW  - Pleuragramma antarcticum
KW  - Age class
KW  - Lipid composition
KW  - Fatty acid trophic markers
KW  -
N2  - Larvae and juvenile stages of Pleuragramma antarcticum have been collected in the Dumont DUrville Sea (East Antarctica) during summer 2008 on board the TRV Umitaka Maru during the CEAMARC survey. Detailed analyses of their lipid class and fatty acid compositions were carried out. P. antarcticum showed a pronounced ontogenic lipid accumulation with increasing size. Larvae displayed a dominance of polar lipids (83% of total lipids) and low percentage of triglycerides (7%). Conversely juveniles showed an increasing accumulation of triglycerides (up to 72.4%). The fatty acid composition of polar lipids remained rather stable between stages with 22:6n3 and 20:5n3 as dominant contributors. The relatively minor ontogenic changes, e.g. increase of monounsaturated and decrease of C18 polyunsaturated fatty acids, may reflect the influence of differences in diet. Triglycerides showed that all three age classes are well segregated in term of fatty acid composition. Larvae triglycerides are characterized by significant percentages of 16:0, 20:5n3, 20:6n3 and to a minor extent 18:4n3, which suggest a prymnesiophyte based diet. Juveniles are characterized by larger percentages of C20:1 and C22:1 acids, considered as markers of Calanus type copepods. The increasing contribution of 18:1n9 in the triglycerides of the older juveniles suggests a gradual and increasing shift from a copepod dominant diet to an euphausiid dominant diet. Fatty acid trophic markers pattern suggests a shift from a phytophagous and omnivorous diet for larvae to a carnivorous diet for juveniles.
SN  - 1873-9652
UR  - http://dx.doi.org/10.1016/j.polar.2010.12.003
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=3332), last updated on Tue, 09 Jul 2024 07:23:30 +0200
ID  - MayzaudP2011
ER  -