Use of Stress Signals of Their Attached Bacteria to Monitor Sympagic Algae Preservation in Canadian Arctic Sediments
| Type | Article | ||||||||||||
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| Date | 2021-12 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Amiraux Rémi 1, 2, 3, Bonin Patricia1, Burot Christopher1, Rontani Jean-François1 |
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| Affiliation(s) | 1 : CNRS/INSU/IRD, Mediterranean Institute of Oceanography (MIO), UM 110, Aix-Marseille University, Université de Toulon, 13288 Marseille, France 2 : UMR 6539 Laboratoire des Sciences de l’Environnement Marin, (CNRS, UBO, IRD, Ifremer) Institut, Universitaire Européen de la Mer (IUEM), 29280 Plouzané, France 3 : Takuvik Joint International Laboratory, Département de Biologie, Laval University (Canada)—CNRS, Université Laval, Québec, QC G1V 0A6, Canada |
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| Source | Microorganisms (2076-2607) (MDPI AG), 2021-12 , Vol. 9 , N. 12 , P. 2626 (15p.) | ||||||||||||
| DOI | 10.3390/microorganisms9122626 | ||||||||||||
| WOS© Times Cited | 3 | ||||||||||||
| Note | This article belongs to the Special Issue Polar Microbes | ||||||||||||
| Keyword(s) | sympagic algae, Arctic, bacterial stress, lipid tracers, sediments, preservation | ||||||||||||
| Abstract | 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 |
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