FN Archimer Export Format
PT J
TI Microbial interactions in marine water amended by eroded benthic biofilm: A case study from an intertidal mudflat
BT 
AF MONTANIE, Helene
   ORY, Pascaline
   ORVAIN, Francis
   DELMAS, Daniel
   DUPUY, Christine
   HARTMANN, Hans J.
AS 1:1;2:1;3:2;4:3;5:1;6:1;
FF 1:;2:;3:;4:PDG-ODE-DYNECO-PELAGOS;5:;6:;
C1 Univ La Rochelle, Littoral Environm & Soc LIENSs, UMR CNRS ULR 7266, F-17000 La Rochelle, France.
   Univ Caen Basse Normandie, BioMEA CNRS FRE3484, F-14032 Caen, France.
   IFREMER, Dyneco, Lab Pelagos, F-29280 Plouzane, France.
C2 UNIV LA ROCHELLE, FRANCE
   UNIV CAEN, FRANCE
   IFREMER, FRANCE
SI BREST
   AUTRE
SE PDG-ODE-DYNECO-PELAGOS
   AUTRE
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.99
TC 11
UR https://archimer.ifremer.fr/doc/00166/27691/25883.pdf
LA English
DT Article
DE ;Mudflats;Virus;Bacteria;HNF;Coastal water
AB In shallow macrotidal ecosystems with large intertidal mudflats, the sediment-water coupling plays a crucial role in structuring the pelagic microbial food web functioning, since inorganic and organic matter and microbial components (viruses and microbes) of the microphytobenthic biofilm can be suspended toward the water column. Two experimental bioassays were conducted in March and July 2008 to investigate the importance of biofilm input for the pelagic Microbial and Viral Loops. Pelagic inocula (< 0.6 μ- and < 10 μ filtrates) were diluted either with < 30 kDa-ultrafiltered seawater or with this ultrafiltrate enriched with the respective size-fractionated benthic biofilm or with < 30 kDa-benthic compounds (BC). The kinetics of heterotrophic nanoflagellates (HNF), bacteria and viruses were assessed together with bacterial and viral genomic fingerprints, bacterial enzymatic activities and viral life strategies. The experimental design allowed us to evaluate the effect of BC modulated by those of benthic size-fractionated microorganisms (virus + bacteria, + HNF). BC presented (1) in March, a positive effect on viruses and bacteria weakened by pelagic HNF. Benthic microorganisms consolidated this negative effect and sustained the viral production together with a relatively diverse and uneven bacterial assemblage structure; (2) in July, no direct impact on viruses but a positive effect on bacteria modulated by HNF, which indirectly enhanced viral multiplication. Both effects were intensified by benthic microorganisms and bacterial assemblage structure became more even. HNF indirectly profited from BC more in March than in July. The Microbial Loop would be stimulated by biofilm during periods of high resources (March) and the Viral Loop during periods of depleted resources (July).
PY 2014
PD SEP
SO Journal Of Sea Research
SN 1385-1101
PU Elsevier Science Bv
VL 92
UT 000342478100010
BP 74
EP 85
DI 10.1016/j.seares.2013.11.011
ID 27691
ER

EF