Seasonal monitoring of lipid degradation processes in the western English Channel links bacterial 10S-DOX enzyme activity to free fatty acid production by phytoplankton

Rontani, Jean‐François; Smik, Lukas; Vaultier, Frédéric; Widdicombe, Claire E.; Belt, Simon T.

doi:10.1016/j.marchem.2021.103928

Cited by 2 publications

(2 citation statements)

References 94 publications

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“…We note that despite this detoxification strategy a high mortality of attached bacteria could previously be observed in sea ice during the sympagic bloom [14]. It was recently observed that 10S-DOX could also be employed by some pelagic bacteria to detoxify free palmitoleic acid released by wounded diatoms in the presence of copepods [38]. The lack of correlation observed between the percentage of 10Shydroxyhexadec-8(trans)-enoic acid and depth (Spearman's rho = −0.22, p = 0.25) suggests a mixed contribution of sympagic and pelagic bacteria to the sedimentary 10S-DOX signal.…”

Section: Contribution Of Sympagic Materials To Arctic Sedimentsmentioning

confidence: 94%

“…Despite this detoxification strategy, most of the bacteria associated with sinking sympagic algae (up to 70%) at the end of ice melting (when osmotic stress ceased) have disrupted membranes and may thus be considered dead [14]. However, importantly, 10S-DOX may also be utilized by bacteria to detoxify FFAs released by wounded pelagic diatoms in the presence of copepods [38].…”

Section: Introductionmentioning

confidence: 99%

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Use of Stress Signals of Their Attached Bacteria to Monitor Sympagic Algae Preservation in Canadian Arctic Sediments

et al. 2021

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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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Section: Contribution Of Sympagic Materials To Arctic Sedimentsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%