Reconstructing ocean oxygenation changes from U/Ca and U/Mn in foraminiferal coatings: Proxy validation and constraints on glacial oxygenation changes


"Deep-sea oxygen concentrations reflect combined effects of air-sea exchange in high-latitude surface waters, ventilation through ocean circulation and the organic carbonremineralization at depth. Reconstruction of past bottom water oxygen (BWO) concentrations has been challenging due to limitations of each existing BWO proxy whose fidelity may be complicated by diagenetic or depositional factors. Therefore, evaluations on BWO changes with multi-proxy approach are always preferred. In this study, we exploit the authigenic uranium content on mixed planktonic foraminiferal coatings as a BWO proxy by presenting new foraminiferal [...]".


Source: Science Direct
Authors: Rong Hu et al.

Read the full article here.

Molybdenum isotope evidence from restricted-basin mudstones for an intermediate extent of oxygenation in the late Ediacaran ocean


"The Mo isotope composition of late Ediacaran global seawater and the global extent of ocean oxygenation are still debated due to the complex controls on sedimentary Mo isotope compositions and the rarity with which sediments directly capture global seawater Mo isotope compositions. Deep-water sulfidic sediments from modern severely restricted basins like the Black Sea have the best chance of capturing global seawater Mo isotope compositions. However, few studies have focused on sedimentary Mo isotope variations and their causes in late Ediacaran restricted basins. [...]". 


Source: Science Direct
Authors: Zhaozhao Tan et al.

Read the full article here.

Impacts of Deoxygenation and Hypoxia on Shark Embryos Anti-Predator Behavior and Oxidative Stress


"Climate change is leading to the loss of oxygen content in the oceans and endangering the survival of many marine species. Due to sea surface temperature warming and changing circulation, the ocean has become more stratified and is consequently losing its oxygen content. Oviparous elasmobranchs are particularly vulnerable as they lay their eggs in coastal and shallow areas, where they experience significant oscillations in oxygen levels. Here, we investigated the effects of deoxygenation (93% air saturation) and hypoxia (26% air saturation) during a short-term period (six days) on the anti-predator avoidance behavior and physiology [...]".


Source: MDPI
Authors: Jaquelino Varela et al.

Read the full article here.

Job Offer in Fish Modelling in the Black Sea

Opening of one position for a 4-year Ph.D. or 3-year mobility postdoc for working on Fish Modelling in the Black Sea

"This position is offered in the frame of the recently funded 4-year Horizon-Europe project NECCTON  (New Copernicus Capability for Trophic Ocean Networks) and is available under a joint supervision at the Liège University (MAST-FOCUS group, Department of Astrophysics, Geophysics and Oceanography), the Royal Netherlands Institute for Sea Research (NIOZ) in the Nederland and the University of Maryland Center for Environmental Science (US). The research project aims at modelling the dynamics of selected fish species (e.g. anchovies, horse mackerel, sprat) in the Black Sea to assess the impact of past and projected environmental changes (e.g. deoxygenation, warming, fishing) on fish distribution and stocks." 

You can find more details in this document

Frontiers in Marine Science special issue on ocean deoxygenation: Call for papers closing tomorrow

Call for paper manuscripts closing tomorrow

This is a quick reminder that the call for paper manuscripts for a special issue on "Constraining Uncertainties in Hindcasts and Future Projections of Marine Deoxygenation" in Frontiers in Marine Science ends tomorrow, 7 April 2023. 

Further information

A study of hypoxia and ocean acidification related physico-chemical parameters in selected coastal waters around Mauritius


"Sea water samples were collected at five stations around Mauritius namely Flic-en-Flac, Albion, Mont Choisy, Trou-d’Eau-Douce and La Cambuse over 12 months from July 2021 to June 2022 for the analysis of dissolved oxygen (D.O), pH and Total alkalinity (). Albion was the only open water system whereas the others were lagoons. Summer was from November 2021 to April 2022 while the period from July 2021 to October 2021, May 2022 and June 2022 were considered to be winter. The summer mean values of sea surface temperature (SST) [...]".


Source: Science Direct
Authors: Yadhav Abhilesh Imrit et al.

Read the full article here.


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