FN Archimer Export Format
PT J
TI Macrozooplankton and micronekton diversity and associated carbon vertical patterns and fluxes under distinct productive conditions around the Kerguelen Islands
BT 
AF Cotté, Cedric
   Ariza, A.
   Berne, Adrien
   Habasque, Jeremie
   LEBOURGES-DHAUSSY, Anne
   ROUDAUT, Gildas
   Espinasse, B.
   Hunt, B.P.V.
   Pakhomov, E.A.
   Henschke, N.
   Péron, C.
   Conchon, A.
   Koedooder, C.
   Izard, L.
   Cherel, Y.
AS 1:1,2;2:3;3:1,2;4:2;5:2;6:2;7:4;8:5,6,7;9:5,6,7;10:5;11:8;12:1,2;13:9,10;14:1;15:11;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;
C1 Sorbonne Université, CNRS, IRD, MNHN, Laboratoire d'Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL), Paris, France
   LEMAR, UBO-CNRS-IRD-Ifremer IUEM, Plouzané, France c MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Sète, France
   MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Sète, France
   Department of Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway
   Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia, Canada
   Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, British Columbia, Canada
   Hakai Institute, PO Box 309, Heriot Bay, BC, Canada
   BOREA, MNHN- CNRS-UPMC-IRD-UCBN-UAG, Paris, France
   Sorbonne Université, UPMC Univ Paris 06, CNRS, Laboratoire d'Océanographie Microbienne (LOMIC), Observatoire Océanologique, Banyuls/mer, France
   The Fredy and Nadine Herrmann Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel
   Centre d'Etudes Biologiques de Chizé (CEBC), UMR 7372 du CNRS-La Rochelle Université, 79360 Villiers-en-Bois, France
C2 MNHN, FRANCE
   IRD, FRANCE
   UNIV MONTPELLIER, FRANCE
   UNIV ARCTIC UIT NORWAY, NORWAY
   UNIV BRITISH COLUMBIA, CANADA
   MPO, CANADA
   HAKAI INST, CANADA
   MNHN, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV HEBREW JERUSALEM, ISRAEL
   CNRS, FRANCE
UM LEMAR
   MARBEC
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 2.8
TC 7
UR https://archimer.ifremer.fr/doc/00729/84089/89010.pdf
LA English
DT Article
CR MD 145 / KEOPS
   MD 188 / KEOPS 2
   MOBYDICK-THEMISTO
BO Marion Dufresne
DE ;Macrozooplankton;Micronekton;Vertical patterns;Active carbon flux;Spatio-temporal variability;Scattering layers;Kerguelen Plateau;Southern Ocean
AB Mesopelagic communities are characterized by a large biomass of diverse macrozooplankton and micronekton (MM) performing diel vertical migration (DVM) connecting the surface to the deeper ocean and contributing to biogeochemical fluxes. In the Southern Ocean, a prominent High Nutrient Low Chlorophyll (HNLC) and low carbon export region, the contribution of MM to the vertical carbon flux of the biological pump remains largely unknown. Furthermore, few studies have investigated MM communities and vertical flux in naturally iron fertilized areas associated with shallow bathymetry. In this study, we assessed the MM community diversity, abundance and biomass in the Kerguelen Island region, including two stations in the HNLC region upstream of the islands, and two stations in naturally iron fertilized areas, one on the Plateau, and one downstream of the Plateau. The MM community was examined using a combination of trawl sampling and acoustic measurements at 18 and 38 kHz from the surface to 800 m. A conspicuous three-layer vertical system was observed in all areas - a shallow scattering layer, SSL, between 10 and 200 m; mid-depth scattering layer, MSL, between 200 and 500 m; deep scattering layer, DSL, between 500 and 800 m - but communities differing among stations. While salps (Salpa thompsoni) dominated the biomass at the productive Kerguelen Plateau and the downstream station, they were scarce in the HNLC upstream area. In addition, crustaceans (mainly Euphausia vallentini and Themisto gaudichaudii) were particularly abundant over the Plateau, representing a large, although varying, carbon stock in the 0–500 m water layer. Mesopelagic fish were prominent below 400 m where they formed permanent or migrant layers accounting for the main source of carbon biomass. Through these spatial and temporal sources of variability, complex patterns of the MM vertical distribution and associated carbon content were identified. The total carbon flux mediated by migratory myctophids at the four stations was quantified. While this flux was likely underestimated, this study identified the main components and mechanisms of active carbon export in the region and how they are modulated by complex topography and land mass effects. 
PY 2022
PD FEB
SO Journal Of Marine Systems
SN 0924-7963
PU Elsevier BV
VL 226
UT 000714510000003
DI 10.1016/j.jmarsys.2021.103650
ID 84089
ER

EF