Bottom-water deoxygenation at the Peruvian Margin during the last deglaciation recorded by benthic foraminifera

Erdem, Zeynep; Schönfeld, Joachim; Rathburn, Anthony E.; Pérez, M. Elena; Cardich, Jorge; Glock, Nicolaas

doi:10.5194/bg-2019-112

Cited by 8 publications

(3 citation statements)

References 83 publications

(165 reference statements)

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“…Additionally, seasonal or annual variability in oxygenation of the upper margin of the OMZ causing a variable oxygenation regime at 528 m may drive selection for species that can tolerate a range of environmental conditions rather than a specific threshold of oxygenation. Further, environmental and ecological factors may combine to drive assemblage diversity; the interactive effects of competition and environmental adaptation may promote habitat specialization at this water depth (Fine et al, 2004). While the sites measured here document changes in the upper margin of the OMZ (528 m site), they may exclude the lower margin of the OMZ due to sampling depths of coring sites.…”

Section: Benthic Foraminiferal Assemblages Across a Modern Environmenmentioning

confidence: 82%

Southern California margin benthic foraminiferal assemblages record recent centennial-scale changes in oxygen minimum zone

et al. 2020

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Abstract. Microfossil assemblages provide valuable records to investigate variability in continental margin biogeochemical cycles, including dynamics of the oxygen minimum zone (OMZ). Analyses of modern assemblages across environmental gradients are necessary to understand relationships between assemblage characteristics and environmental factors. Five cores were analyzed from the San Diego margin (32∘42′00′′ N, 117∘30′00′′ W; 300–1175 m water depth) for core top benthic foraminiferal assemblages to understand relationships between community assemblages and spatial hydrographic gradients as well as for down-core benthic foraminiferal assemblages to identify changes in the OMZ through time. Comparisons of benthic foraminiferal assemblages from two size fractions (63–150 and >150 µm) exhibit similar trends across the spatial and environmental gradient or in some cases exhibit more pronounced spatial trends in the >150 µm fraction. A range of species diversity exists within the modern OMZ (1.910–2.586 H, Shannon index), suggesting that diversity is not driven by oxygenation alone. We identify two hypoxic-associated species (B. spissa and U. peregrina), one oxic-associated species (G. subglobosa) and one OMZ edge-associated species (B. argentea). Down-core analysis of indicator species reveals variability in the upper margin of the OMZ (528 m water depth) while the core of the OMZ (800 m) and below the OMZ (1175 m) remained stable in the last 1.5 kyr. We document expansion of the upper margin of the OMZ beginning 400 BP on the San Diego margin that is synchronous with other regional records of oxygenation.

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Section: Benthic Foraminiferal Assemblages Across a Modern Environmenmentioning

confidence: 82%

Southern California margin benthic foraminiferal assemblages record recent centennial-scale changes in oxygen minimum zone

et al. 2020

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“…There are various proxies that have been used to capture low oxygen waters of OMZs: presence/absence of sedimentary laminations, benthic foraminifera assemblages and morphology, redox sensitive metals, and nitrogen isotopes (Moffitt et al, 2015;Rathburn et al, 2018;Erdem et al, 2020;Studer et al, 2021). Application of most of these proxies are however limited to sediment cores that are immersed in low oxygen waters , limiting the areal extent of assessments of past OMZs to the upper continental slope.…”

Section: Comparison Of Plankton Tow Derived Planktic Foraminifera I/c...mentioning

confidence: 99%

The Marine Iodine Cycle, Past, Present and Future

2024

Frontiers Research Topics

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Frontiers is more than just an open access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers journal seriesThe Frontiers journal series is a multi-tier and interdisciplinary set of openaccess, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers journal series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to qualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation. What are Frontiers Research Topics?Frontiers Research Topics are very popular trademarks of the Frontiers journals series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area.

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“…There are various proxies that have been used to capture low oxygen waters of OMZs: presence/absence of sedimentary laminations, benthic foraminifera assemblages and morphology, redox sensitive metals, and nitrogen isotopes (Moffitt et al, 2015;Rathburn et al, 2018;Erdem et al, 2020;Studer et al, 2021). Application of most of these proxies are however limited to sediment cores that are immersed in low oxygen waters (Winkelbauer et al, 2021), limiting the areal extent of assessments of past OMZs to the upper continental slope.…”

Section: Comparison Of Plankton Tow Derived Planktic Foraminifera I/c...mentioning

confidence: 99%

Planktic foraminifera iodine/calcium ratios from plankton tows

et al. 2023

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Planktic foraminifera test iodine to calcium ratios represent an emerging proxy method to assess subsurface seawater oxygenation states. Several core-top studies show lower planktic foraminifera I/Ca in locations with oxygen depleted subsurface waters compared to well oxygenated environments. The reasoning behind this trend is that only the oxidized species of iodine, iodate, is incorporated in foraminiferal calcite. The I/Ca of foraminiferal calcite is thought to reflect iodate contents in seawater. To test this hypothesis, we compare planktic foraminifera I/Ca ratios, obtained from plankton tows, with published and new seawater iodate concentrations from 1) the Eastern North Pacific with extensive oxygen depletion, 2) the Benguela Current System with moderately depleted oxygen concentrations, and 3) the well oxygenated North and South Atlantic. We find the lowest I/Ca ratios (0.07 µmol/mol) in planktic foraminifera retrieved from the Eastern North Pacific, and higher values for samples (up to 0.72 µmol/mol) obtained from the Benguela Current System and North and South Atlantic. The I/Ca ratios of plankton tow foraminifera from environments with well oxygenated subsurface waters, however, are an order of magnitude lower compared to core-tops from similarly well-oxygenated regions. This would suggest that planktic foraminifera gain iodine post-mortem, either when sinking through the water column, or during burial.

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Bottom-water deoxygenation at the Peruvian Margin during the last deglaciation recorded by benthic foraminifera

Cited by 8 publications

References 83 publications

Southern California margin benthic foraminiferal assemblages record recent centennial-scale changes in oxygen minimum zone

Southern California margin benthic foraminiferal assemblages record recent centennial-scale changes in oxygen minimum zone

The Marine Iodine Cycle, Past, Present and Future

Planktic foraminifera iodine/calcium ratios from plankton tows

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