Stress factors resulting from the Arctic vernal sea-ice melt
Bibliographic Data
| ID | 19568960 |
|---|---|
| Authors | Rémi Amiraux (0000-0002-1369-3614, Centre National de la Recherche Scientifique), Christopher Burot (Centre National de la Recherche Scientifique), Patricia Bonin (0000-0002-4194-7343, Centre National de la Recherche Scientifique), Guillaume Massé (Université Laval), Sophie Guasco (Centre National de la Recherche Scientifique), Marcel Babin (0000-0001-9233-2253, Université Laval), Frédéric Vaultier (Centre National de la Recherche Scientifique), Jean-François Rontani (Centre National de la Recherche Scientifique) |
| Year | 2020 |
| Volume | 8 |
| Issue | 1 |
| Publication date | 2020-11-20 |
| Peer Reviewed | Yes |
| Open Access | Yes |
| Type | ARTICLE |
| Venue | Elementa Science of the Anthropocene (JOURNAL) |
| Journal identifiers | ISSN: 2325-1026 • E-ISSN: 2325-1026 |
| Publisher | University of California Press (PUBLISHER • US) |
| DOI | 10.1525/elementa.076 |
| OpenAlex | W3107962788 |
| Language | EN |
| Citations received | 1 |
| References cited | 106 |
During sea-ice melt in the Arctic, primary production by sympagic (sea-ice) algae can be exported efficiently to the seabed if sinking rates are rapid and activities of associated heterotrophic bacteria are limited. Salinity stress due to melting ice has been suggested to account for such low bacterial activity. We further tested this hypothesis by analyzing samples of sea ice and sinking particles collected from May 18 to June 29, 2016, in western Baffin Bay as part of the Green Edge project. We applied a method not previously used in polar regions—quantitative PCR coupled to the propidium monoazide DNA-binding method—to evaluate the viability of bacteria associated with sympagic and sinking algae. We also measured cis-trans isomerase activity, known to indicate rapid bacterial response to salinity stress in culture studies, as well as free fatty acids known to be produced by algae as bactericidal compounds. The viability of sympagic-associated bacteria was strong in May (only approximately 10% mortality of total bacteria) and weaker in June (average mortality of 43%; maximum of 75%), with instances of elevated mortality in sinking particle samples across the time series (up to 72%). Short-term stress reflected by cis-trans isomerase activity was observed only in samples of sinking particles collected early in the time series. Following snow melt, however, and saturating levels of photosynthetically active radiation in June, we observed enhanced ice-algal production of bactericidal compounds (free palmitoleic acid; up to 4.8 mg L–1). We thus suggest that protection of sinking sympagic material from bacterial degradation early in a melt season results from low bacterial activity due to salinity stress, while later in the season, algal production of bactericidal compounds induces bacterial mortality. A succession of bacterial stressors during Arctic ice melt helps to explain the efficient export of sea-ice algal material to the seabed
Algae · Arctic · Arctic ice pack · Bacteria · Biology · Botany · Salinity · Sea ice · Arctic and Antarctic ice dynamics · Marine and coastal ecosystems · Methane Hydrates and Related Phenomena · Ecology · Geology · Oceanography
Ice in the Ocean, by Peter Wadhams
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Methods for biogeochemical studies of sea ice
Temporal evolution of IP25 and other highly branched isoprenoid lipids in sea ice and the underlying water column during an Arctic melting season
Bacterial use of choline to tolerate salinity shifts in sea-ice brines
Relative Contributions of Ice Algae, Phytoplankton, and Benthic Microalgae to Primary Production in Nearshore Regions of the Beaufort Sea
| Unique citing works | 1 |
|---|---|
| Citations per year | 0.2 |
| Citation span | 2021 - 2021 (1) |
| Citation velocity | historical |
| Highly cited | No |
| Citation types | Neutral: 1 |