FN Archimer Export Format
PT J
TI Influence of shallow hydrothermal fluid release on the functioning of phytoplankton communities
BT 
AF Tilliette, Chloé
   Gazeau, Frédéric
   Portlock, Gemma
   Benavides, Mar
   Bonnet, Sophie
   Guigue, Catherine
   Leblond, Nathalie
   Lory, Caroline
   Marie, Dominique
   Montanes, Maryline
   Pulido-Villena, Elvira
   SARTHOU, Geraldine
   Tedetti, Marc
   Vorrath, Maria-Elena
   Whitby, Hannah
   Guieu, Cécile
AS 1:1;2:1;3:2;4:3;5:3;6:3;7:1;8:3;9:4;10:1;11:3;12:5;13:3;14:6;15:2;16:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;
C1 Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, Villefranche-sur-Mer, France
   Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
   Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO, Marseille, France
   CNRS, Sorbonne Université, UMR7144, Team ECOMAP, Station Biologique de Roscoff, Roscoff, France
   University of Brest, CNRS, IRD, Ifremer, LEMAR, Plouzané, France
   Intitut für Geologie, University Hamburg, Hamburg, Germany
C2 UNIV SORBONNE, FRANCE
   UNIV LIVERPOOL, UK
   UNIV AIX MARSEILLE, FRANCE
   CNRS, FRANCE
   CNRS, FRANCE
   UNIV HAMBURG, GERMANY
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3.7
TC 3
UR https://archimer.ifremer.fr/doc/00836/94818/102334.pdf
   https://archimer.ifremer.fr/doc/00836/94818/102335.pdf
LA English
DT Article
CR TONGA 2019
BO L'Atalante
DE ;hydrothermal fluids;phytoplankton communities;trace metal;fertilizing effect;toxic effect;Western Tropical South Pacific;community functioning;thiol compounds
AB In the Western Tropical South Pacific (WTSP) Ocean, a hotspot of dinitrogen fixation has been identified. The survival of diazotrophs depends, among others, on the availability of dissolved iron (DFe) largely originating, as recently revealed, from shallow hydrothermal sources located along the Tonga-Kermadec arc that fertilize the Lau Basin with this element. On the opposite, these fluids, released directly close to the photic layer, can introduce numerous trace metals at concentrations that can be toxic to surface communities. Here, we performed an innovative 9-day experiment in 300 L reactors onboard the TONGA expedition, to examine the effects of hydrothermal fluids on natural plankton communities in the WTSP Ocean. Different volumes of fluids were mixed with non-hydrothermally influenced surface waters (mixing ratio from 0 to 14.5%) and the response of the communities was studied by monitoring numerous stocks and fluxes (phytoplankton biomass, community composition, net community production, N2 fixation, thiol production, organic carbon and metal concentrations in exported material). Despite an initial toxic effect of hydrothermal fluids on phytoplankton communities, these inputs led to higher net community production and N2 fixation rates, as well as elevated export of organic matter relative to control. This fertilizing effect was achieved through detoxification of the environment, rich in potentially toxic elements (e.g., Cu, Cd, Hg), likely by resistant Synechococcus ecotypes able to produce strong binding ligands, especially thiols (thioacetamide-like and glutathione-like compounds). The striking increase of thiols quickly after fluid addition likely detoxified the environment, rendering it more favorable for phytoplankton growth. Indeed, phytoplankton groups stressed by the addition of fluids were then able to recover important growth rates, probably favored by the supply of numerous fertilizing trace metals (notably Fe) from hydrothermal fluids and new nitrogen provided by N2 fixation. These experimental results are in good agreement with in-situ observations, proving the causal link between the supply of hydrothermal fluids emitted at shallow depth into the surface layer and the intense biological productivity largely supported by diazotrophs in the WTSP Ocean. This study highlights the importance of considering shallow hydrothermal systems for a better understanding of the biological carbon pump. 
PY 2023
PD MAY
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media
VL 10
UT 000993440800001
DI 10.3389/fmars.2023.1082077
ID 94818
ER

EF