FN Archimer Export Format
PT J
TI Seasonal microbial food web dynamics in contrasting Southern Ocean productivity regimes
BT 
AF Christaki, Urania
   Gueneugues, Audrey
   Liu, Yan
   Blain, Stéphane
   Catala, Philippe
   Colombet, Jonathan
   Debeljak, Pavla
   Jardillier, Ludwig
   Irion, Solène
   PLANCHON, Frederic
   Sassenhagen, Ingrid
   Sime Ngando, Telesphore
   Obernosterer, Ingrid
AS 1:1;2:2;3:2;4:2;5:2;6:3;7:2;8:4;9:1;10:5;11:1;12:3;13:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;
C1 Univ. Littoral Côte d’Opale ULCO, CNRS, Univ. Lille, UMR 8187, LOG, Laboratoire d’Océanologie et de Géosciences, F-Code postal Ville, France
   Sorbonne Université, CNRS, Laboratoire d’Océanographie Microbienne (LOMIC), Banyuls-sur-Mer, France
   Laboratoire Microorganismes: Génome et Environnement (LMGE), UMR CNRS 6023, Clermont Université Blaise Pascal, Aubière Cedex, France
   Unité d’Ecologie, Systématique et Evolution, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, Orsay Cedex, France
   University of Brest, Laboratoire des Sciences de l’Environnement (LEMAR), UMR6539 CNRS/UBO/IFREMER/IRD, Technopôle Brest Iroise, Plouzané, France
C2 UNIV LITTORAL COTE D'OPALE, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV CLERMONT FERRAND, FRANCE
   UNIV PARIS SUD, FRANCE
   UBO, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 5.019
TC 20
UR https://archimer.ifremer.fr/doc/00649/76109/77064.pdf
   https://archimer.ifremer.fr/doc/00649/76109/77065.tiff
   https://archimer.ifremer.fr/doc/00649/76109/77066.tif
   https://archimer.ifremer.fr/doc/00649/76109/77067.tif
   https://archimer.ifremer.fr/doc/00649/76109/77068.tif
   https://archimer.ifremer.fr/doc/00649/76109/77069.docx
LA English
DT Article
CR MD 145 / KEOPS
   MD 188 / KEOPS 2
   MOBYDICK-THEMISTO
BO Marion Dufresne
AB Spatial and seasonal dynamics of microbial loop fluxes were investigated in contrasting productivity regimes in the Indian sector of the Southern Ocean. Observations carried out in late summer (February–March 2018; project MOBYDICK) revealed higher microbial biomasses and fluxes in the naturally iron‐fertilized surface waters of Kerguelen island in comparison to surrounding off‐plateau waters. Differences were most pronounced for bacterial heterotrophic production (2.3‐fold), the abundance of heterotrophic nanoflagellates (HNF; 2.7‐fold). Independent of site, grazing by HNF was the main loss process of bacterial production (80–100%), while virus‐induced mortality was low (< 9%). Combining these results with observations from previous investigations during early spring and summer allowed us to describe seasonal patterns in microbial food web fluxes and to compare these to carbon export in the iron‐fertilized and high‐nutrient, low‐chlorophyll (HNLC) Southern Ocean. Our data suggest an overall less efficient microbial food web during spring and summer, when respiration and viral lysis, respectively, represent important loss terms of bacterially‐mediated carbon. In late summer, primary production is more efficiently transferred to bacterial biomass and HNF and thus available for higher trophic levels. These results provide a new insight into the seasonal variability and the quantitative importance of microbial food web processes for the fate of primary production in the Southern Ocean 
PY 2021
PD JAN
SO Limnology And Oceanography
SN 0024-3590
PU ASLO
VL 66
IS 1
UT 000569169700001
BP 108
EP 122
DI 10.1002/lno.11591
ID 76109
ER

EF