FN Archimer Export Format
PT J
TI Sedimentological imprint on subseafloor microbial communities in Western Mediterranean Sea Quaternary sediments
BT 
AF CIOBANU, Maria Cristina
   RABINEAU, Marina
   DROZ, Laurence
   REVILLON, Sidonie
   GHIGLIONE, J. -F.
   DENNIELOU, Bernard
   JORRY, Stephan
   KALLMEYER, J.
   ETOUBLEAU, Joel
   PIGNET, Patricia
   CRASSOUS, Philippe
   VANDENABEELE-TRAMBOUZE, Odile
   LAUGIER, J.
   GUEGAN, Matthieu
   GODFROY, Anne
   ALAIN, Karine
AS 1:1,2,3,4;2:4;3:4;4:4;5:5;6:;7:;8:6;9:;10:1,2,3;11:7;12:1,2,3;13:1;14:1;15:1,2,3;16:1,2,3;
FF 1:PDG-REM-GM-LES;2:;3:;4:;5:;6:PDG-REM-GM-LES;7:PDG-REM-GM-LES;8:;9:PDG-REM-GM-LGM;10:PDG-REM-EEP-LMEE;11:PDG-REM-EEP-LEP;12:;13:;14:;15:PDG-REM-EEP-LMEE;16:;
C1 Univ Bretagne Occidentale, UEB, IUEM, LMEE,UMR 6197, F-29280 Plouzane, France.
   CNRS, IUEM, UMR 6197, LMEE, F-29280 Plouzane, France.
   IFREMER, UMR6197, LMEE, F-29280 Plouzane, France.
   CNRS, IUEM, UMR 6538, Lab Domaines Ocean, F-29280 Plouzane, France.
   CNRS, Observ Oceanol Banyuls S Mer, UMR 7621, Lab Oceanog Microbienne LOMIC, F-66650 Banyuls Sur Mer, France.
   Univ Potsdam, D-14476 Potsdam, Germany.
   IFREMER, Lab Environm Profonds, F-29280 Plouzane, France.
C2 UBO, FRANCE
   CNRS, FRANCE
   IFREMER, FRANCE
   CNRS, FRANCE
   CNRS, FRANCE
   UNIV POTSDAM, GERMANY
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LES
   PDG-REM-GM-LGM
   PDG-REM-EEP-LMEE
   PDG-REM-EEP-LEP
IN WOS Ifremer jusqu'en 2018
   DOAJ
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3.75
TC 12
TU Centre national de la recherche scientifique
   Institut de recherche pour le développement
   Institut français de recherche pour l'exploitation de la mer
   Service Hydrographique et Océanographique de la Marine
   Université Pierre et Marie Curie
   Université de Bretagne Occidentale
   Université de Bretagne-Sud
UR https://archimer.ifremer.fr/doc/00090/20171/17826.pdf
   https://archimer.ifremer.fr/doc/00090/20171/17827.pdf
LA English
DT Article
CR ESSCAR-9
   IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   RHOSOS
BO Le Suroît
   Marion Dufresne
AB An interdisciplinary study was conducted to evaluate the relationship between geological and paleoenvironmental parameters and the bacterial and archaeal community structure of two contrasting subseafloor sites in the Western Mediterranean Sea (Ligurian Sea and Gulf of Lion). Both depositional environments in this area are well-documented from paleoclimatic and paleooceanographic point of views. Available data sets allowed us to calibrate the investigated cores with reference and dated cores previously collected in the same area, and notably correlated to Quaternary climate variations. DNA-based fingerprints showed that the archaeal diversity was composed by one group, Miscellaneous Crenarchaeotic Group (MCG), within the Gulf of Lion sediments and of nine different lineages (dominated by MCG, South African Gold Mine Euryarchaeotal Group (SAGMEG) and Halobacteria) within the Ligurian Sea sediments. Bacterial molecular diversity at both sites revealed mostly the presence of the classes Alphaproteobacteria, Betaproteobacteria and Gammaproteobacteria within Proteobacteria phylum, and also members of Bacteroidetes phylum. The second most abundant lineages were Actinobacteria and Firmicutes at the Gulf of Lion site and Chloroflexi at the Ligurian Sea site. Various substrates and cultivation conditions allowed us to isolate 75 strains belonging to four lineages: Alpha-, Gammaproteobacteria, Firmicutes and Actinobacteria. In molecular surveys, the Betaproteobacteria group was consistently detected in the Ligurian Sea sediments, characterized by a heterolithic facies with numerous turbidites from a deep-sea levee. Analysis of relative betaproteobacterial abundances and turbidite frequency suggested that the microbial diversity was a result of main climatic changes occurring during the last 20 ka. Statistical direct multivariate canonical correspondence analyses (CCA) showed that the availability of electron acceptors and the quality of electron donors (indicated by age) strongly influenced the community structure. In contrast, within the Gulf of Lion core, characterized by a homogeneous lithological structure of upper-slope environment, most detected groups were Bacteroidetes and, to a lesser extent, Betaproteobacteria. At both site, the detection of Betaproteobacteria coincided with increased terrestrial inputs, as confirmed by the geochemical measurements (Si, Sr, Ti and Ca). In the Gulf of Lion, geochemical parameters were also found to drive microbial community composition. Taken together, our data suggest that the palaeoenvironmental history of erosion and deposition recorded in the Western Mediterranean Sea sediments has left its imprint on the sedimentological context for microbial habitability, and then indirectly on structure and composition of the microbial communities during the late Quaternary.
PY 2012
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 9
IS 9
UT 000310472600001
BP 3491
EP 3512
DI 10.5194/bg-9-3491-2012
ID 20171
ER

EF