FN Archimer Export Format
PT J
TI Trophic ecology of European sardine Sardina pilchardus and European anchovy Engraulis encrasicolus in the Bay of Biscay (north-east Atlantic) inferred from delta C-13 and delta N-15 values of fish and identified mesozooplanktonic organisms
BT 
AF CHOUVELON, Tiphaine
   CHAPPUIS, A.
   BUSTAMANTE, Paco
   LEFEBVRE, Sebastien
   MORNET, Francoise
   GUILLOU, G.
   VIOLAMER, L.
   DUPUY, Christine
AS 1:1;2:1;3:1;4:2;5:3;6:1;7:1;8:1;
FF 1:;2:;3:;4:;5:PDG-RBE-HGS-LRHLR;6:;7:;8:;
C1 Univ La Rochelle, CNRS, Littoral Environm & Soc, UMR 7266, F-17000 La Rochelle, France.
   Univ Lille 1 Sci & Technol, CNRS, Lab Oceanol & Geosci, Stn Marine Wimereux,UMR 8187, F-62930 Wimereux, France.
   IFREMER, Lab Ressources Halieut La Rochelle, F-17087 Lhoumeau, France.
C2 UNIV LA ROCHELLE, FRANCE
   UNIV LILLE, FRANCE
   IFREMER, FRANCE
SI LA ROCHELLE
SE PDG-RBE-HGS-LRHLR
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.99
TC 33
TU Centre national de la recherche scientifique
   Université Lille 1 - Sciences technologies
   Université de La Rochelle
   Université du Littoral Côte d'Opale
UR https://archimer.ifremer.fr/doc/00176/28741/27280.pdf
LA English
DT Article
CR PELGAS 2010
   PELGAS 2012
BO Thalassa
DE ;Plankton preservation;Plankton delipidation;Pelagic fish;Trophic interactions;Spatial variability;Isotopic mixing model
AB European sardine (Sardina pilchardus) and European anchovy (Engraulis encrasicolus) are two species of economical and ecological significance in the Bay of Biscay (north-east Atlantic). However, the trophic ecology of both species is still poorly known in the area, and more generally, few studies have considered the potential trophic overlap between sardines and anchovies worldwide. This study aims to highlight the trophic links between the mesozooplankton and adults of these two pelagic fish in the Bay of Biscay, through carbon and nitrogen stable isotope analysis (SIA). Mesozooplankton and individuals of sardines and anchovies were collected during one season (spring 2010), over spatially contrasted stations within the study area. First, the potential effect of preservation (ethanol vs. freezing) and of delipidation (by cyclohexane) on mesozooplankton delta C-13 and delta N-15 values was assessed. Results demonstrated the necessity to correct for the preservation effect and for lipid contents in mesozooplankton for further analyses of sardines' and anchovies' diet through SIA. Next, this study highlighted the interest of working on identified mesozooplanktonic organisms instead of undetermined assemblages when unravelling food sources of planktivorous fish using stable isotopes. The inter-specific variability of isotope values within a planktonic assemblage was effectively high, probably depending on the various feeding behaviours that can occur among mesozooplankton species. Intra-specific variability was also significant and related to the spatial variations of baseline signatures in the area. To investigate the foraging areas and potential diet overlap of S. pilchardus and E. encrasicolus, mixing models (SIAR) were applied. Both fish species appeared to feed mainly in the neritic waters of the Bay of Biscay in spring and to select mainly small- to medium-sized copepods (e.g. Acartia sp., Temora sp.). However, E. encrasicolus showed a greater trophic plasticity by foraging more offshore and on a wider range of prey sizes, while S. pilchardus seemed more limited to coastal areas and the mesozooplanktonic species of these waters for feeding.
PY 2014
PD JAN
SO Journal Of Sea Research
SN 1385-1101
PU Elsevier Science Bv
VL 85
UT 000329884700027
BP 277
EP 291
DI 10.1016/j.seares.2013.05.011
ID 28741
ER

EF