FN Archimer Export Format PT J TI Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem: An elemental and isotopic study at the ecosystem space scale BT AF DUBOIS, S. SAVOYE, N. GREMARE, Antoine PLUS, Martin CHARLIER, K. BELTOISE, A. BLANCHET, Hugues AS 1:1;2:1;3:1;4:2;5:3;6:1;7:1; FF 1:;2:;3:;4:PDG-ODE-LER-LERAR;5:;6:;7:; C1 Univ Bordeaux 1, CNRS, UMR EPOC 5805, Stn Marine Arcachon, F-33120 Arcachon, France. IFREMER, LER AR, F-33120 Arcachon, France. Univ Bordeaux 1, CNRS, UMR EPOC 5805, F-33405 Talence, France. C2 UNIV BORDEAUX, FRANCE IFREMER, FRANCE UNIV BORDEAUX, FRANCE SI ARCACHON SE PDG-ODE-LER-LERAR IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france IF 2.66 TC 72 UR https://archimer.ifremer.fr/doc/00073/18426/15984.pdf https://archimer.ifremer.fr/doc/00073/18426/16059.pdf LA English DT Article BO Planula IV DE ;Sediment organic matter;Primary producers;C and N stable isotopes;Zostera noltii;Arcachon Bay AB The origin and composition of sediment organic matter (SOM) were investigated together with its spatial distribution in the Arcachon Bay - a macrotidal lagoon that shelters the largest Zostera noltii meadow in Europe - using elemental and isotopic ratios. Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to SOM were estimated using a mixing model. The SOM composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, SOM was composed of 25% of decayed phanerogams, 19% of microphytobenthos, 20% of phytoplankton, 19% of river SPOM and 17% of macroalgae. There was no evidence of anthropogenic N-sources and SOM was mainly of autochthonous origin. None of the tested environmental parameters - salinity, current speed, emersion, granulometry and chlorophyll a - nor a combination of them explained the low spatial variability of SOM composition and characteristics. Resuspension, mixing and redistribution of the different particulate organic matters by wind-induced and tidal currents in combination with shallow depth probably explain the observed homogeneity at the whole bay scale. (C) 2011 Elsevier B.V. All rights reserved. PY 2012 PD JUL SO Journal Of Marine Systems SN 0924-7963 PU Elsevier Science Bv VL 94 UT 000300748500006 BP 64 EP 73 DI 10.1016/j.jmarsys.2011.10.009 ID 18426 ER EF