Fatty acid and stable isotope characteristics of sea ice and pelagic particulate organic matter in the Bering Sea: tools for estimating sea ice algal contribution to Arctic food web production

Wang, Shiway W.; Budge, Suzanne M.; Gradinger, Rolf; Iken, Katrin; Wooller, Matthew J.

doi:10.1007/s00442-013-2832-3

Cited by 61 publications

(63 citation statements)

References 63 publications

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“…This is the first study showing that the spatial variability in ice-algal standing stock could be potentially tracked in benthic consumer tissues by the use of carbon stable isotope composition. Further investigations, using fatty acid profiles and compound-specific carbon stable isotope composition of individual fatty acids (Wang et al, 2014) and/or using the ice-algal biomarker IP 25 (Brown and Belt, 2012) and/or the novel H-Print approach , are needed to complement the present study and to confirm the importance of high ice-algal standing stock in the overall diet of the Canadian Arctic benthic consumers.…”

Section: Summary and Implicationsmentioning

confidence: 71%

“…We currently lack the information to establish if and how inter-annual and spatial variability of ice-algal biomass may influence benthic faunal δ 13 C values, especially at varying water depths. Future work including concurrent sampling of sea-ice algae and benthic consumers or the use of ice-algal specific biomarkers (e.g., δ 13 C of essential fatty acids; Wang et al, 2014) could test the importance of sea-ice algae for benthic consumers in the Canadian Arctic more specifically.…”

Section: Benthic Faunal Assimilation Pathwaysmentioning

confidence: 99%

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Benthic faunal assimilation pathways and depth-related changes in food-web structure across the Canadian Arctic

Roy

Iken

Gosselin

et al. 2015

Deep Sea Research Part I: Oceanographic Research Papers

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Section: Summary and Implicationsmentioning

confidence: 71%

Section: Benthic Faunal Assimilation Pathwaysmentioning

confidence: 99%

Benthic faunal assimilation pathways and depth-related changes in food-web structure across the Canadian Arctic

Roy

Iken

Gosselin

et al. 2015

Deep Sea Research Part I: Oceanographic Research Papers

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“…Another microbial process that may have led to the discrepancies between IC1 and IC2 could be methane production from ice algae-derived organic carbon in IC1. With typical carbon isotopic signatures of −20 to −30 ‰ for icederived carbon (e.g., Wang et al, 2014), methane produced from this substrate would be enriched in 13 C (more positive) compared to the initial pool of methane (about −60 ‰, Figs. 2 and 6).…”

Section: Particulate Methane Monooxygenase (Pmoa) Sequencesmentioning

confidence: 96%

Methane-oxidizing seawater microbial communities from an Arctic shelf

et al. 2018

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Abstract. Marine microbial communities can consume dissolved methane before it can escape to the atmosphere and contribute to global warming. Seawater over the shallow Arctic shelf is characterized by excess methane compared to atmospheric equilibrium. This methane originates in sediment, permafrost, and hydrate. Particularly high concentrations are found beneath sea ice. We studied the structure and methane oxidation potential of the microbial communities from seawater collected close to Utqiagvik, Alaska, in April 2016. The in situ methane concentrations were 16.3 ± 7.2 nmol L −1 , approximately 4.8 times oversaturated relative to atmospheric equilibrium. The group of methaneoxidizing bacteria (MOB) in the natural seawater and incubated seawater was > 97 % dominated by Methylococcales (γ -Proteobacteria). Incubations of seawater under a range of methane concentrations led to loss of diversity in the bacterial community. The abundance of MOB was low with maximal fractions of 2.5 % at 200 times elevated methane concentration, while sequence reads of non-MOB methylotrophs were 4 times more abundant than MOB in most incubations. The abundances of MOB as well as non-MOB methylotroph sequences correlated tightly with the rate constant (k ox ) for methane oxidation, indicating that non-MOB methylotrophs might be coupled to MOB and involved in community methane oxidation. In sea ice, where methane concentrations of 82 ± 35.8 nmol kg −1 were found, Methylobacterium (α-Proteobacteria) was the dominant MOB with a relative abundance of 80 %. Total MOB abundances were very low in sea ice, with maximal fractions found at the icesnow interface (0.1 %), while non-MOB methylotrophs were present in abundances similar to natural seawater communities. The dissimilarities in MOB taxa, methane concentrations, and stable isotope ratios between the sea ice and water column point toward different methane dynamics in the two environments.

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“…Ice algae derived organic carbon, which has a carbon isotopic signature of about -20‰ to -30‰ (e.g. Wang et al, 2014), could serve as substrate for methane production. Methane produced from this substrate would be enriched in 13 C (more positive) compared to the initial pool of methane (about -60‰ in IC2) and could explain the shift of the bulk methane isotopic signatures towards more positive values for IC1 (Figure 2, Figure 6).…”

Section: Methane Concentration and Stable Isotope Ratios In Seawater mentioning

confidence: 99%

Methane oxidizing seawater microbial communities from an Arctic shelf

Uhlig¹,

Kirkpatrick²,

Dhondt³

et al. 2017

Preprint

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Abstract. Microbial communities of the ocean can consume methane dissolved in seawater before it has a chance to escape to the atmosphere and contribute to greenhouse warming. Seawater over the shallow Arctic shelf is characterized by excess methane compared to the atmospheric equilibrium originating in sediments, permafrost and hydrates. Particularly high 10 concentrations are found beneath sea ice. We studied the structure and methane oxidation potential of the microbial communities from seawater collected close to Utqiagvik, Alaska, in April 2016. The in situ methane concentrations were 16.3 ± 7.2 nmol L -1 , approximately 4.8 times oversaturated compared to the atmospheric equilibrium. The group of methane oxidizing bacteria (MOB) in the natural seawater and seawater incubations was >97% dominated by Methylococcacales (γ-Proteobacteria). Incubations of seawater under a range of methane concentrations led to a loss of 15 diversity in the bacterial community. The abundance of MOB was low with maximal fractions of 2.5% at 200 times elevated methane concentration, while sequence reads of non-MOB methylotrophs were four times more abundant than MOB in most incubations. The abundances of MOB as well as non-MOB methylotrophs correlated tightly with the rate constant (k ox ) for methane oxidation, indicating that non-MOB methylotrophs might be coupled to MOB and involved in community methane oxidation. In sea ice, where methane concentrations of 82 ± 35.8 nmol kg -1 were found, Methylobacterium (α-Proteobacteria) 20 was the dominant MOB with a relative abundance of 80%. MOB abundances were very low in sea ice, with maximal fractions found at the ice-snow interface (0.1%), while non-MOB-methlylotrophs were present in abundances compared to natural seawater communities. The differences in MOB taxa and an offset in methane concentration and stable isotope ratios between the ice and the water column point toward different methane cycling processes in both habitats.

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Fatty acid and stable isotope characteristics of sea ice and pelagic particulate organic matter in the Bering Sea: tools for estimating sea ice algal contribution to Arctic food web production

Cited by 61 publications

References 63 publications

Benthic faunal assimilation pathways and depth-related changes in food-web structure across the Canadian Arctic

Benthic faunal assimilation pathways and depth-related changes in food-web structure across the Canadian Arctic

Methane-oxidizing seawater microbial communities from an Arctic shelf

Methane oxidizing seawater microbial communities from an Arctic shelf

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