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Lipid dynamics and trophic patterns in Pleuragramma antarctica life stages

Published online by Cambridge University Press:  18 March 2015

Carolina Giraldo ,
Patrick Mayzaud ,
Eric Tavernier ,
Marc Boutoute ,
Florian Penot  and
Philippe Koubbi
Carolina Giraldo
Affiliation:
l'Université Pierre et Marie Curie Université Paris 06, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France
Patrick Mayzaud*
Affiliation:
Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France
Eric Tavernier
Affiliation:
Université Lille Nord de France, F-59000 Lille, France Université du littoral Côte d'Opale, Laboratoire d’Océanologie et de Géosciences, 32 avenue Foch, F-62930 Wimereux, France
Marc Boutoute
Affiliation:
Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France
Florian Penot
Affiliation:
l'Université Pierre et Marie Curie Université Paris 06, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France
Philippe Koubbi
Affiliation:
l'Université Pierre et Marie Curie Université Paris 06, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7093, Laboratoire d'Océanographie de Villefranche, BP28, 06234 Villefranche-sur-Mer, France
*
*corresponding author: mayzaud@obs-vlfr.fr
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Abstract

The aim of this study was to clarify the trophic patterns of the key species Pleuragramma antarctica in the Dumont d’Urville Sea, through its development and possible changes according to sampling locations. Variability in diet composition of larvae, juvenile and adult P. antarctica was analysed using fatty acid markers. Analysis of lipid class in P. antarctica reflected lipid accumulation with increasing size at all sampling stations. The fatty acid composition of triacylglycerol highlighted ontogenetic changes in the diet. Phytoplankton markers, such as C16PUFA:C16 and EPA:DHA ratios >1, and carnivorous markers in larvae suggested an omnivorous diet. Comparison between the fatty acid signature of P. antarctica older stages (juveniles and adults) and zooplankton species using OPLS-discriminant analysis indicated that juveniles fed mainly on euphausiid larvae and to a minor extent on copepods, and confirmed that non-herbivorous copepods were the main prey for adults. Our results suggest that different feeding patterns and a generalist strategy in P. antarctica with juveniles feeding on bigger prey than adults, probably as a result of prey availability according to their vertical segregation pattern.

Keywords

fatty acidsfeeding patternsontogenetic changes

Information

Type
Biological Sciences
Information
Antarctic Science , Volume 27 , Issue 5 , October 2015 , pp. 429 - 438
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Copyright
© Antarctic Science Ltd 2015 

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