FN Archimer Export Format PT J TI Spatial variation in stable isotopes and fatty acid trophic markers in albacore tuna (Thunnus alalunga) from the western Indian Ocean BT AF Dhurmeea, Zahirah Pethybridge, Heidi Langlais, Clothilde Somes, Christopher J. Nikolic, Natacha Bourjea, Jerome Appadoo, Chandani Bodin, Nathalie AS 1:1,2,3;2:3;3:3;4:4;5:5,6;6:7;7:1;8:2,8; FF 1:;2:;3:;4:;5:PDG-RBE-DOI;6:PDG-RBE-MARBEC-LHM;7:;8:; C1 Department of Biosciences and Ocean Studies, Faculty of Science, University of Mauritius, Réduit, Mauritius IRD - Research Unit MARine Biodiversity, Exploitation & Conservation, Victoria, Mahé, Seychelles CSIRO Oceans and Atmosphere, Hobart, Australia GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105, Kiel, Germany Ifremer, DOI La Réunion, Le Port, Reunion Island, France IRD, UMR MARBEC, Sainte-Clotilde, Reunion Island, France IRD, UMR MARBEC, Sainte-Clotilde, Reunion Island, France Seychelles Fishing Authority, Victoria, Mahé, Seychelles C2 UNIV MAURITIUS, MAURITIUS IRD, FRANCE CSIRO OCEANS AND ATMOSPHERE, AUSTRALIA IFM GEOMAR, GERMANY IFREMER, FRANCE IRD, FRANCE IFREMER, FRANCE SEYCHELLES FISHING AUTHOR, SEYCHELLES SI LA REUNION SETE SE PDG-RBE-DOI PDG-RBE-MARBEC-LHM UM MARBEC IN WOS Ifremer UPR WOS Ifremer UMR WOS Cotutelle UMR copubli-france copubli-p187 copubli-europe copubli-int-hors-europe copubli-sud IF 2.955 TC 5 UR https://archimer.ifremer.fr/doc/00623/73497/72787.pdf LA English DT Article DE ;Trophodynamics;Phytoplankton;Environmental parameters;Climate change AB Albacore tuna (Thunnus alalunga) is a highly economically important species in the western Indian Ocean. However, knowledge of its ecological and nutritional characteristics, essential for proper management of the species, is lacking in the region. The trophodynamics of the Indian Ocean albacore was thus examined using known fatty acid trophic markers (FATMs) of primary producers, nutritional condition indices (NCIs) (omega-3/omega-6 ratio and total fatty acid content (TFA)), and baseline and lipid corrected stable isotope of carbon (δ13Ccorr) and nitrogen (δ15Ncorr), measured in the muscle tissue. We applied generalized additive mixed models to understand the spatiotemporal patterns and drivers of these tracers, taking into consideration several intrinsic and extrinsic variables: fish size, fishing position, month, chlorophyll-a and sea surface temperature (SST). Both chlorophyll-a and SST were significant as single explanatory variables for all tracers with SST being the best predictor for docosahexaenoic acid/eicosapentaenoic acid ratio, the omega-6 protists FATM, omega-3/omega-6 ratio and δ15Ncorr. TFA was best predicted by fish size only. The best model for δ13Ccorr for males included fishing position only while that for females included fish size, fishing position and month. Higher primary productivity, as inferred by high δ13Ccorr values and diatom contribution, nutritional condition and trophic position, as inferred by high δ15Ncorr values, were observed in albacore from the temperate southern waters than in the northern tropical regions. Relationships between environmental variables and corrected stable isotopes, FATMs confirm that ocean warming and changes in primary productivity will impact nutrient flow and energy transfer in the marine food web which may have negative nutritional outcomes for albacore. This knowledge is particularly crucial in areas where oceanographic conditions and seawater temperatures are changing at a fast rate and should also be taken into consideration by fisheries managers. PY 2020 PD JUN SO Deep-sea Research Part I-oceanographic Research Papers SN 0967-0637 PU Elsevier BV VL 161 UT 000540839500007 DI 10.1016/j.dsr.2020.103286 ID 73497 ER EF