FN Archimer Export Format
PT J
TI Use of Stress Signals of Their Attached Bacteria to Monitor Sympagic Algae Preservation in Canadian Arctic Sediments
BT 
AF Amiraux, Rémi
   Bonin, Patricia
   Burot, christopher
   Rontani, Jean-François
AS 1:1,2,3;2:1;3:1;4:1;
FF 1:;2:;3:;4:;
C1 CNRS/INSU/IRD, Mediterranean Institute of Oceanography (MIO), UM 110, Aix-Marseille University, Université de Toulon, 13288 Marseille, France
   UMR 6539 Laboratoire des Sciences de l’Environnement Marin, (CNRS, UBO, IRD, Ifremer) Institut, Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France
   Takuvik Joint International Laboratory, Département de Biologie, Laval University (Canada)—CNRS, Université Laval, Québec, QC G1V 0A6, Canada
C2 UNIV AIX MARSEILLE, FRANCE
   UBO, FRANCE
   UNIV LAVAL, CANADA
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 4.926
TC 3
UR https://archimer.ifremer.fr/doc/00741/85343/90382.pdf
   https://archimer.ifremer.fr/doc/00741/85343/90383.zip
LA English
DT Article
DE ;sympagic algae;Arctic;bacterial stress;lipid tracers;sediments;preservation
AB Based on the strong aggregation of sympagic (ice-associated) algae and the high mortality or inactivity of bacteria attached to them, it was previously hypothesized that sympagic algae should be significant contributors to the export of carbon to Arctic sediments. In the present work, the lipid content of 30 sediment samples collected in the Canadian Arctic was investigated to test this hypothesis. The detection of high proportions of trans vaccenic fatty acid (resulting from cis-trans isomerase (CTI) activity of bacteria under hypersaline conditions) and 10S-hydroxyhexadec-8(trans)-enoic acid (resulting from 10S-DOX bacterial detoxification activity in the presence of deleterious free palmitoleic acid) confirmed: (i) the strong contribution of sympagic material to some Arctic sediments, and (ii) the impaired physiological status of its associated bacterial communities. Unlike terrestrial material, sympagic algae that had escaped zooplanktonic grazing appeared relatively preserved from biotic degradation in Arctic sediments. The expected reduction in sea ice cover resulting from global warming should cause a shift in the relative contributions of ice-associated vs. pelagic algae to the seafloor, and thus to a strong modification of the carbon cycle 
PY 2021
PD DEC
SO Microorganisms
SN 2076-2607
PU MDPI AG
VL 9
IS 12
UT 000735940300001
DI 10.3390/microorganisms9122626
ID 85343
ER

EF