FN Archimer Export Format
PT J
TI Seasonal habitat and length influence on the trophic niche of co-occurring tropical tunas in the eastern Atlantic Ocean
BT 
AF SARDENNE, Fany
   DIAHA, N'Guessan Constance
   AMANDE, Monin Justin
   ZUDAIRE, Iker
   COUTURIER, Lydie
   METRAL, Luisa
   LE GRAND, Fabienne
   BODIN, Nathalie
AS 1:1,2;2:3;3:3;4:1,4;5:2;6:5;7:2;8:1,6;
FF 1:PDG-RBE-MARBEC-LHM;2:;3:;4:;5:;6:PDG-RBE-MARBEC-LHM;7:;8:;
C1 UM, Res Inst Sustainable Dev, Ctr Rech Halieut, UMR MARBEC,IRD,CNRS,Ifremer, Sete, France.
   Univ Western Brittany, UMR LEMAR, CNRS, UBO,IRD,Ifremer, Brest, France.
   Ctr Rech Oceanol, Abidjan, Cote Ivoire.
   Basque Fdn Sci, Ikerbasque, Bilbao, Spain.
   UM, UMR MARBEC, IFREMER, IRD,CNRS,Ctr Rech Halieut, Sete, France.
   Seychelles Fishing Author, Victoria, Seychelles.
C2 IRD, FRANCE
   UBO, FRANCE
   CRO, COTE IVOIRE
   IKERBASQUE, SPAIN
   IFREMER, FRANCE
   SEYCHELLES FISHING AUTHOR, SEYCHELLES
SI SETE
SE PDG-RBE-MARBEC-LHM
UM LEMAR
   MARBEC
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-p187
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 2.849
TC 5
UR https://archimer.ifremer.fr/doc/00436/54796/56254.pdf
LA English
DT Article
AB In the Gulf of Guinea, bigeye Thunnus obesus (BET) and yellowfin tuna Thunnus albacares (YFT) are important for commercial fisheries and play a prominent ecological role as top predators. Using fatty acid profiles and carbon and nitrogen stable isotopes we examined their niche partitioning in this understudied region. Niche overlap was high (>70%), similar to percentages in other ocean basins. BET occupied a higher trophic position than YFT and fed on deeper prey (high δ15N values and high proportions of mono-unsaturated fatty acids). The trophic position of YFT decreased slightly in the last 15 years (δ15N values decrease ~0.5 ‰) suggesting a change in epipelagic communities, as observed in the eastern Pacific Ocean. Ontogenic changes were limited to BET. For both species, the dietary proportion of the diatoms marker (20:5n-3) increased in the seasonal upwelling area, highlighting the seasonal habitat influence on tunas diet. The relatively lipid-rich muscle (~6 % dry weight) of Atlantic tropical tunas suggested a richer diet in this region than for Indian Ocean tropical tunas and/or differences in energy allocation strategies. 
PY 2019
PD JAN
SO Canadian Journal Of Fisheries And Aquatic Sciences
SN 0706-652X
PU Canadian Science Publishing, Nrc Research Press
VL 76
IS 1
UT 000454939000007
BP 69
EP 80
DI 10.1139/cjfas-2017-0368
ID 54796
ER

EF