Eubuliminella tenuata as a new proxy for quantifying past bottom water oxygenation

Tetard, Martin; Ovsepyan, E. A.; Licari, Laëtitia

doi:10.1016/j.marmicro.2021.102016

Cited by 8 publications

(4 citation statements)

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“…5D). The proliferation of E. exilis at station 16 seems to be fostered by temperature, as this species prefers warmer waters (Caralp, 1989;Kaiho, 1994;McKay et al, 2015McKay et al, , 2016Tetard et al, 2021a). The abundance of B. marginata and P. neocarinata, two other warmer-water species (Murray, 1991;Sen Gupta & Aharon, 1994;Platon, 2001), also increases towards the top of the sequence before disappearing between the late 1990s and the early 2000s at station 16, while the abundance of the colderwater species N. labradorica, P. osloensis, E. clavatum, and V. arctica (Vilks, 1969;Schafer & Cole, 1986;Knudsen et al, 1996;Polyak et al, 2002;Rytter et al, 2002) decreases (Fig.…”

Section: Benthic Foraminiferal Response To Changes In Bottom-water Co...mentioning

confidence: 99%

“…Regardless of the causes of oxygen depletion, the decrease in bottom-water oxygenation in the LC over the past century resulted in variations in the benthic foraminiferal assemblages preserved in the sediment (Thibodeau et al, 2006;Genovesi et al, 2011). As benthic foraminifera are sensitive to oxygenation (Sen Gupta & Machain-Castillo, 1993;Bernhard et al, 1997;Osterman, 2003;Platon et al, 2005), the abundance and diversity of species can be used to qualitatively and quantitatively (Ohkushi et al, 2013;Tetard et al, 2017Tetard et al, , 2021aHoogakker et al, 2018;Erdem et al, 2020) assess the level of bottom-water DO concentrations. Temperature, primary production, organic carbon fluxes, and water mass distribution may also modulate the distribution of assemblages (e.g., Jorissen et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Benthic Foraminiferal Assemblages from the Laurentian Channel in the Lower Estuary and Gulf of ST. Lawrence, Eastern Canada: Tracers of Bottom-Water Hypoxia

Audet

Vernal

Mucci

et al. 2023

Journal of Foraminiferal Research

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Over the past century, an increase in temperatures and a decrease in dissolved oxygen concentrations have been observed in the bottom waters of the Laurentian Channel (LC), throughout the Lower St. Lawrence Estuary (LSLE) and the Gulf of St. Lawrence (GSL), eastern Canada. To document the impact of these changes, we analyzed the benthic foraminiferal assemblages and geochemical signatures of four sediment cores taken in the LC. Radiometric measurements (210Pb, 226Ra, 137Cs) indicate that the studied cores encompass the last 50 years of sedimentation in the LSLE and the last ∼160 years in the GSL. The sedimentary record shows a 60 to 65% decrease in benthic foraminiferal taxonomic diversity in the LC since the 1960s. An accelerated change in the foraminiferal assemblages is observed at approximately the same time at all studied sites, around the late 1990s and the early 2000s, towards populations dominated by the hypoxia-tolerant indicator taxa Brizalina subaenariensis, Eubuliminella exilis, and Globobulimina auriculata. This evolution of assemblages reflects incursions of the hypoxic zone into the western GSL over the last decades. The results of our multivariate analyses highlight the potential of benthic foraminiferal assemblages as a proxy of bottom-water hypoxia.

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Section: Benthic Foraminiferal Response To Changes In Bottom-water Co...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Benthic Foraminiferal Assemblages from the Laurentian Channel in the Lower Estuary and Gulf of ST. Lawrence, Eastern Canada: Tracers of Bottom-Water Hypoxia

Audet

Vernal

Mucci

et al. 2023

Journal of Foraminiferal Research

View full text Add to dashboard Cite

show abstract

Section: Benthic Foraminiferal Response To Changes In Bottom-water Co...mentioning

confidence: 99%

Benthic Foraminiferal Assemblages From the Laurentian Channel in the Lower Estuary and Gulf of St. Lawrence, Eastern Canada: Tracers of Bottom-Water Hypoxia

Audet,

de Vernal,

Seidenkrantz

et al. 2023

Geological Society of America Abstracts With Programs

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Over the past century, an increase in temperatures and a decrease in dissolved oxygen concentrations have been observed in the bottom waters of the Laurentian Channel (LC), throughout the Lower St. Lawrence Estuary (LSLE) and the Gulf of St. Lawrence (GSL), eastern Canada. To document the impact of these changes, we analyzed the benthic foraminiferal assemblages and geochemical signatures of four sediment cores taken in the LC. Radiometric measurements ( 210 Pb, 226 Ra, 137 Cs) indicate that the studied cores encompass the last 50 years of sedimentation in the LSLE and the last ∼160 years in the GSL. The sedimentary record shows a 60 to 65% decrease in benthic foraminiferal taxonomic diversity in the LC since the 1960s. An accelerated change in the foraminiferal assemblages is observed at approximately the same time at all studied sites, around the late 1990s and the early 2000s, towards populations dominated by the hypoxia-tolerant indicator taxa Brizalina subaenariensis, Eubuliminella exilis, and Globobulimina auriculata. This evolution of assemblages reflects incursions of the hypoxic zone into the western GSL over the last decades. The results of our multivariate analyses highlight the potential of benthic foraminiferal assemblages as a proxy of bottom-water hypoxia.

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“…In these areas, a slight enhancement of bottom-water oxygenation was reported for the Younger Dryas (YD, 12.9-11.7 ka BP, Veres et al, 2013). The records of benthic foraminiferal (BF) assemblages and geochemical data have been discussed as proxies to quantitatively assess the past oxygen variations at the intermediate and deep water levels (e.g., Gooday, 2003;Jorissen et al, 2007;Tetard et al, 2017;Tetard et al, 2021a, Tetard et al, 2021bHoogakker et al, 2015;Hoogakker et al, 2018;Erdem et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period

et al. 2021

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Deglacial dissolved oxygen concentrations were semiquantitatively estimated for intermediate and deep waters in the western Bering Sea using the benthic foraminiferal-based transfer function developed by Tetard et al. (2017), Tetard et al. (2021a). Benthic foraminiferal assemblages were analyzed from two sediment cores, SO201-2-85KL (963 m below sea level (mbsl), the intermediate-water core) and SO201-2-77KL (2,163 mbsl, the deep-water core), collected from the Shirshov Ridge in the western Bering Sea. Intermediate waters were characterized by an oxygen content of ∼2.0 ml L−1 or more during the Last Glacial Maximum (LGM)–Heinrich 1 (H1), around 0.15 ml L−1 during the middle Bølling/Allerød (B/A)–Early Holocene (EH), and a slight increase in [O2] (∼0.20 ml L−1) at the beginning of the Younger Dryas (YD) mbsl. Deep-water oxygen concentrations ranged from 0.9 to 2.5 ml L−1 during the LGM–H1, hovered around 0.08 ml L−1 at the onset of B/A, and were within the 0.30–0.85 ml L−1 range from the middle B/A to the first half of YD and the 1.0–1.7 ml L−1 range from the middle to late Holocene. The [O2] variations remind the δ18O NGRIP record thereby providing evidence for a link between the Bering Sea oxygenation at intermediate depths and the deglacial North Atlantic climate. Changes in the deep-water oxygen concentrations mostly resemble the deglacial dynamics of the Southern Ocean upwelling intensity which is supposed to be closely coupled with the Antarctic climate variability. This coherence suggests that deglacial deep-water [O2] variations were primarily controlled by changes in the circulation of southern-sourced waters. Nevertheless, the signal from the south at the deeper site might be amplified by the Northern Hemisphere climate warming via an increase in sea-surface bioproductivity during the B/A and EH. A semi-enclosed position of the Bering Sea and sea-level oscillations might significantly contribute to the magnitude of oxygenation changes in the study area during the last deglaciation. Interregional correlation of different proxy data from a wide range of water depths indicates that deglacial oxygenation changes were more pronounced in the Bering and Okhotsk marginal seas than along the open-ocean continental margin and abyssal settings of the North Pacific.

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Eubuliminella tenuata as a new proxy for quantifying past bottom water oxygenation

Cited by 8 publications

References 75 publications

Benthic Foraminiferal Assemblages from the Laurentian Channel in the Lower Estuary and Gulf of ST. Lawrence, Eastern Canada: Tracers of Bottom-Water Hypoxia

Benthic Foraminiferal Assemblages from the Laurentian Channel in the Lower Estuary and Gulf of ST. Lawrence, Eastern Canada: Tracers of Bottom-Water Hypoxia

Benthic Foraminiferal Assemblages From the Laurentian Channel in the Lower Estuary and Gulf of St. Lawrence, Eastern Canada: Tracers of Bottom-Water Hypoxia

Intermediate- and Deep-Water Oxygenation History in the Subarctic North Pacific During the Last Deglacial Period

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