@article{fdi:010081119,
  title = {{B}acterial diversity and lipid biomarkers in sea ice and sinking particulate organic material during the melt season in the {C}anadian {A}rctic},
  author = {{A}miraux, {R}. and {R}ontani, {J}. {F}. and {A}rmougom, {F}abrice and {F}rouin, {E}. and {B}abin, {M}. and {A}rtigue, {L}. and {B}onin, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he estimation of important carbon fluxes in a changing {A}rctic environment remains a challenge, one that could benefit from the development of biomarkers that distinguish between sympagic (ice-associated) and pelagic organic material. {P}roducts of 10{S}-{DOX}-like lipoxygenase and fatty acid cis-trans isomerase ({CTI}) activity of bacteria attached to sympagic particulate organic matter ({POM}) were proposed previously as potential biomarkers of the contribution of sympagic biota to carbon fluxes to the seafloor. {T}o date, neither the bacteria involved in such enzymatic activities nor the detection of these potential biomarkers at their presumed source (i.e., sea ice) has been investigated. {H}ere, we determined and compared the diversity of prokaryotic communities (based on operational taxonomic units) attached to sea ice {POM} and under-ice sinking particles during an early stage of ice melt (brine drainage) in {B}affin {B}ay ({C}anadian {A}rctic). {B}ased on a time series of biodiversity analyses and the quantification of lipid tracers of these two bacterial enzymatic activities, we suggest that {CTI}-active bacteria, exposed to hypersaline stress, are attached to algal {POM} just above bottom sea ice and released into the water column following brine drainage. {I}n contrast, bacteria attached to sinking particles and exhibiting 10{S}-{DOX}-like lipoxygenase activity are suggested to come from the bottommost layer of sea ice, where they may play a role in the detoxification of algae-produce free fatty acids. {T}hese results provide a refined view of the potential use of products of {CTI} activity as specific biomarkers of sympagic organic matter.},
  keywords = {{B}acterial community ; {B}acterial stress ; {B}iomarkers ; {C}is/trans isomerase ; 10{S}-{DOX}-like lipoxygenase ; {I}ce biota ; {A}rctic environment ; {CANADA} ; {ARCTIQUE} ; {BAFFIN} {BAIE}},
  booktitle = {},
  journal = {{E}lementa : {S}cience of the {A}nthropocene},
  volume = {9},
  numero = {1},
  pages = {[18 ]},
  ISSN = {2325-1026},
  year = {2021},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081119},
}