FN Archimer Export Format
PT J
TI Plankton community structure in response to hydrothermal iron inputs along the Tonga-Kermadec arc
BT 
AF Mériguet, Zoé
   Vilain, Marion
   Baudena, Alberto
   Tilliette, Chloé
   Habasque, Jeremie
   Lebourges-Dhaussy, Anne
   Bhairy, Nagib
   Guieu, Cécile
   Bonnet, Sophie
   Lombard, Fabien
AS 1:1;2:2;3:1;4:1;5:3;6:3;7:4;8:1;9:4;10:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Laboratoire d’Océanographie de Villefranche, Sorbonne Université, CNRS, Villefranche sur mer, France
   Unité Biologie des Organismes et Ecosystèmes Aquatiques, Muséum National d’Histoire Naturelle, Sorbonne Université, CNRS, IRD, Paris, France
   LEMAR, UBO, CNRS, IRD, Ifremer, Plouzané, France
   Mediterranean Institute of Oceanography, Aix Marseille Univ., Université de Toulon, CNRS, IRD, Marseille, France
C2 UNIV SORBONNE, FRANCE
   MNHN, FRANCE
   IRD, FRANCE
   IRD, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-univ-france
IF 3.7
TC 1
UR https://archimer.ifremer.fr/doc/00855/96737/105284.pdf
   https://archimer.ifremer.fr/doc/00855/96737/105285.zip
LA English
DT Article
CR TONGA 2019
BO L'Atalante
DE ;plankton imaging;diazotrophic cyanobacteria;iron fertilization;nutrient limitation;WTSP
AB The Western Tropical South Pacific (WTSP) basin has been identified as a hotspot of atmospheric dinitrogen fixation due to the high dissolved iron ([DFe]) concentrations (up to 66 nM) in the photic layer linked with the release of shallow hydrothermal fluids along the Tonga-Kermadec arc. Yet, the effect of such hydrothermal fluids in structuring the plankton community remains poorly studied. During the TONGA cruise (November-December 2019), we collected micro- (20-200 μm) and meso-plankton (>200 μm) samples in the photic layer (0-200 m) along a west to east zonal transect crossing the Tonga volcanic arc, in particular two volcanoes associated with shallow hydrothermal vents (< 500 m) in the Lau Basin, and both sides of the arc represented by Melanesian waters and the South Pacific Gyre. Samples were analyzed by quantitative imaging (FlowCam and ZooScan) and then coupled with acoustic observations, allowing us to study the potential transfer of phytoplankton blooms to higher planktonic trophic levels. We show that micro- and meso-plankton exhibit high abundances and biomasses in the Lau Basin and, to some extent, in Melanesian waters, suggesting that shallow hydrothermal inputs sustain the planktonic food web, creating productive waters in this otherwise oligotrophic region. In terms of planktonic community structure, we identified major changes with high [DFe] inputs, promoting the development of a low diversity planktonic community dominated by diazotrophic cyanobacteria. Furthermore, in order to quantify the effect of the shallow hydrothermal vents on chlorophyll a concentrations, we used Lagrangian dispersal models. We show that chlorophyll a concentrations were significantly higher inside the Lagrangian plume, which came into contact with the two hydrothermal sites, confirming the profound impact of shallow hydrothermal vents on plankton production. 
PY 2023
PD OCT
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 10
UT 001086198500001
DI 10.3389/fmars.2023.1232923
ID 96737
ER

EF