Efficiency of sympagic-benthic coupling revealed by analyses of n-3 fatty acids, IP25 and other highly branched isoprenoids in two filter-feeding Arctic benthic molluscs: Mya truncata and Serripes groenlandicus

Amiraux, Rémi; Archambault, Philippe; Moriceau, Brivaëla; Lemire, Mélanie; Babin, Marcel; Mémery, Laurent; Massé, Guillaume; Tremblay, Jean‐Éric

doi:10.1016/j.orggeochem.2020.104160

Cited by 16 publications

(17 citation statements)

References 96 publications

(130 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…HBI‐III production is thus consistent with open water conditions (Belt, 2018, 2019; Köseoğlu et al., 2018; Smik, Cabedo‐Sanz, & Belt, 2016) although recently Amiraux et al. (2021) reported the occurrence of this HBI in sea ice in southwest Baffin Bay.…”

Section: Discussionsupporting

confidence: 69%

“…Intermediate values were found in the MIZ where brassicasterol and sympagic HBIs were abundant in accordance with our present knowledge on these biomarkers. HBI-III production is thus consistent with open water conditions (Belt, 2018(Belt, , 2019Köseoğlu et al, 2018;Smik, Cabedo-Sanz, & Belt, 2016) although recently Amiraux et al (2021) reported the occurrence of this HBI in sea ice in southwest Baffin Bay.…”

Section: Phytoplankton Biomarkerssupporting

confidence: 77%

See 1 more Smart Citation

HBIs and Sterols in Surface Sediments Across the East Siberian Sea: Implications for Palaeo Sea‐Ice Reconstructions

Ren

Sicre

et al. 2022

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Since the beginning of the twentieth century, the global ocean has undergone unprecedented changes caused by global warming (Gillett et al., 2021;Stocker et al., 2013). These changes are notably pronounced in the Arctic region due to polar amplification with major consequences for sea-ice cover and the thermohaline circulation (Cavalieri et al., 1997;Shindell & Faluvegi, 2009). The Arctic Ocean and its marginal seas are characterized by large seasonal sea-ice changes. Melting in summer and sea-ice formation in winter, including coastal polynyas, through the production of cold and saline waters, alter deep-water formation and subsequently the Arctic Ocean circulation (Arrigo, 2014;Cai et al., 2010;Overland & Wang, 2013;Xiao et al., 2013). At the current rate of decline (0.42% year −1 ), the Arctic Ocean may be ice-free in summer season in the next 50 or even 30 years (Comiso, 2012;Wang et al., 2019), which will profoundly impact the global climate and carbon cycle and further accelerate global warming causing damages to the polar ecosystems (Moline et al., 2008). In Arctic marginal seas changes in sea-ice cover and thickness involve different thermodynamic and dynamic factors (Polyakov et al., 2003). In the case of the East Siberian Sea (ESS), land run-off and atmospheric circulation are controlling factors of the sea-ice distribution (Park et al., 2020;Rigor & Wallace, 2004).Our knowledge on natural variability of Arctic sea ice and on-going changes are limited by the lack of long time series observations. Information on past sea-ice distribution can be obtained from micropaleontological fossils (

show abstract

Section: Discussionsupporting

confidence: 69%

Section: Phytoplankton Biomarkerssupporting

confidence: 77%

HBIs and Sterols in Surface Sediments Across the East Siberian Sea: Implications for Palaeo Sea‐Ice Reconstructions

Ren

Sicre

et al. 2022

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…3.2) can also be used as the phytoplankton biomarker in lieu of HBI III (e.g., Müller et al, 2011). Although in some regions high concentrations of HBI III have also been associated with highly productive marginal ice zones (Barents Sea, Belt et al, 2019), marine fronts (North Iceland Shelf, Harning et al, 2021), and sea ice (Amiraux et al, 2019(Amiraux et al, , 2021Koch et al, 2020) that may complicate PIP 25 -derived indices, recent compilations of Arctic surface sediments show that PIP 25 -based indices broadly correlate with spring and autumn sea ice concentrations (Xiao et al, 2015;Kolling et al, 2020).…”

Section: Hbismentioning

confidence: 99%

Biomarker characterization of the North Water Polynya, Baffin Bay: implications for local sea ice and temperature proxies

et al. 2023

View full text Add to dashboard Cite

Abstract. The North Water Polynya (NOW, Inuktitut: Sarvarjuaq; Kalaallisut: Pikialasorsuaq), Baffin Bay, is the largest polynya and one of the most productive regions in the Arctic. This area of thin to absent sea ice is a critical moisture source for local ice sheet sustenance and, coupled with the inflow of nutrient-rich Arctic Surface Water, supports a diverse community of Arctic fauna and indigenous people. Although paleoceanographic records provide important insight into the NOW's past behavior, it is critical that we better understand the modern functionality of paleoceanographic proxies. In this study, we analyzed lipid biomarkers, including algal highly branched isoprenoids and sterols for sea ice extent and pelagic productivity and archaeal glycerol dibiphytanyl glycerol tetraethers (GDGTs) for ocean temperature, in a set of modern surface sediment samples from within and around the NOW. In conjunction with previously published datasets, our results show that all highly branched isoprenoids exhibit strong correlations with each other and not with sterols, which suggests a spring or autumn sea ice diatom source for all highly branched isoprenoids (HBIs) rather than a combination of sea ice and open-water diatoms as seen elsewhere in the Arctic. Sterols are also highly concentrated in the NOW and exhibit statistically higher concentrations here compared to sites south of the NOW, consistent with the order of magnitude higher primary productivity observed within the NOW relative to surrounding waters in spring and summer months. Finally, our local temperature calibrations for GDGTs and OH-GDGTs reduce the uncertainty present in global temperature calibrations but also identify some additional variables that may be important in controlling their local distribution, such as nitrate availability and dissolved oxygen. Collectively, our analyses provide new insight into the utility of these lipid biomarker proxies in high-latitude settings and will help provide a refined perspective on the past development of the NOW with their application in downcore reconstructions.

show abstract

“…The combined hexane extracts were dried over anhydrous Na 2 SO 4 , filtered and concentrated to obtain the fatty acid fraction and methylated for further detection with gas chromatography-mass spectrometry (GC-MS). GC-MS analysis of fatty acids was carried out using selected ion monitoring (SIM) mode and an Agilent 7890A series gas chromatograph (DB 5MS fused silica column; 50 m x 0.25 mm i.d., 0.25-mm film thickness) coupled to an Agilent 5975C mass spectrometric detector (Amiraux et al, 2020). Quantification of fatty acids was carried out by comparing mass spectral intensities of molecular ions to that of the internal standard and normalizing for volume/mass sampled and differences in mass spectral fragmentation efficiency (e.g., response factors of each fatty acids identified with Supelco1 37 Component FAME Mix, Supelco).…”

Section: Lipid Analysesmentioning

confidence: 99%

Content in fatty acids and carotenoids in phytoplankton blooms during the seasonal sea ice retreat in Hudson Bay complex, Canada

Amiraux

Lavaud

Cameron-Bergeron

et al. 2022

Elementa: Science of the Anthropocene

Self Cite

View full text Add to dashboard Cite

The Hudson Bay complex (HBC) is home to numerous indigenous communities that traditionally have relied heavily on its marine resources. The nutritional quality and stocks of the entire HBC food web depend in large part on the phytoplankton production of bioactive molecules (long chain polyunsaturated fatty acids and carotenoids) and their transfer through trophic levels. The purpose of this study was thus to determine which molecules were produced during spring phytoplankton blooms, as well as the environmental factors driving this production. We investigated 21 stations in 5 sub-regions of the HBC. At the time of sampling, the sub-regions studied had different environmental settings (e.g., ice cover, nutrients, seawater salinity and temperature) conditioning their bloom stages. Pre- and post-bloom stages were associated with relatively low concentrations of bioactive molecules (either fatty acids or carotenoids). In contrast, the highest concentrations of bioactive molecules (dominated by eicosapentaenoic acid and fucoxanthin) were associated with the diatom bloom that typically occurs at the ice edge when silicates remain available. Interestingly, the large riverine inputs in eastern Hudson Bay led to a change in protist composition (larger contribution of Dinophyceae), resulting in lower while more diverse content of bioactive molecules, whether fatty acids (e.g., α-linolenic acid) or carotenoids (e.g., peridinin). As greater stratification of the HBC is expected in the future, we suggest that a mixotrophic/heterotrophic flagellate-based food web would become more prevalent, resulting in a smaller supply of bioactive molecules for the food web.

show abstract

Efficiency of sympagic-benthic coupling revealed by analyses of n-3 fatty acids, IP25 and other highly branched isoprenoids in two filter-feeding Arctic benthic molluscs: Mya truncata and Serripes groenlandicus

Abstract: Efficiency of sympagic-benthic coupling revealed by analyses of n-3 fatty acids, IP 25 and other highly branched isoprenoids in two filter-feeding Arctic benthic molluscs: Mya truncata and Serripes groenlandicus, Organic Geochemistry (2020), doi:

Cited by 16 publications

References 96 publications

HBIs and Sterols in Surface Sediments Across the East Siberian Sea: Implications for Palaeo Sea‐Ice Reconstructions

HBIs and Sterols in Surface Sediments Across the East Siberian Sea: Implications for Palaeo Sea‐Ice Reconstructions

Biomarker characterization of the North Water Polynya, Baffin Bay: implications for local sea ice and temperature proxies

Content in fatty acids and carotenoids in phytoplankton blooms during the seasonal sea ice retreat in Hudson Bay complex, Canada

Contact Info

Product

Resources

About