Macrofaunal contributions to benthic nutrient fluxes revealed by radium disequilibrium DOI Creative Commons
Isabelle J. Cooper, Jasmin A. Godbold, Amber Annett

et al.

Limnology and Oceanography, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

Abstract The benthic flux of nutrients underpins marine food webs, influences conditions for life in the oceans, and contributes to climatic feedback. Estimates these fluxes' contributions macro‐ micronutrient cycles are, however, highly variable, generating significant uncertainty biogeochemical models. Traditional methodologies have potentially limitations, geochemically framed studies, there is a notable omission from macrofaunal activity. 224 Ra/ 228 Th disequilibrium cutting‐edge geochemical technique quantifying flux; its capacity incorporate influence fauna has not been assessed. Here we present first results using examine four macrobenthic infaunal invertebrate species on macronutrients (, , ) between sediment water column. Overall, estimates were up 15 times greater than those derived commonly used methods, both Ra nutrient fluxes differed presence different macrofauna. greatest efflux influx occurred burrowing actinarian Edwardsia claparedii patterns suggested mechanisms species. Notable variability enhancement was also individuals same species, highlighting complex relationship biodiversity ecosystem functioning. We conclude that powerful tool interdisciplinary ecological if applied widely enough may more holistically represent dynamics natural environment standard approaches.

Language: Английский

Heterotrophic denitrification enhancement via effective organic matter degradation driven by suitable iron dosage in sediment DOI
Pan Yan, Li Tang,

Tongtong Ren

et al.

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 375, P. 124275 - 124275

Published: Jan. 24, 2025

Language: Английский

Citations

3
Direct ocean capture: the emergence of electrochemical processes for oceanic carbon removal DOI
Prince Aleta, Abdelrahman Refaie, Mohsen Afshari

et al.

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(11), P. 4944 - 4967

Published: Jan. 1, 2023

This study explores the emerging development of electrochemical direct ocean capture (eDOC) as an effective negative emission technology; focusing on pH swing mechanisms, we highlight advancements in eDOC and identify key areas for future research.

Language: Английский

Citations

26
Ediacaran–Cambrian bioturbation did not extensively oxygenate sediments in shallow marine ecosystems DOI Creative Commons
Alison Cribb, Sebastiaan van de Velde, William M. Berelson

et al.

Geobiology, Journal Year: 2023, Volume and Issue: 21(4), P. 435 - 453

Published: Feb. 22, 2023

Abstract The radiation of bioturbation during the Ediacaran–Cambrian transition has long been hypothesized to have oxygenated sediments, triggering an expansion habitable benthic zone and promoting increased infaunal tiering in early Paleozoic communities. However, effects on sediment oxygen are underexplored with respect importance biomixing bioirrigation, two processes which can opposite redox chemistry. We categorized trace fossils from Ediacaran Terreneuvian as or bioirrigation integrated sedimentological proxies for intensity biogeochemical modeling simulate penetration depths through transition. Ultimately, we find that despite dramatic increases ichnodiversity Terreneuvian, remains dominant behavior, contrast traditional assumptions, was unlikely resulted extensive oxygenation shallow marine sediments globally.

Language: Английский

Citations

24
Evidence of dark oxygen production at the abyssal seafloor DOI Creative Commons
Andrew K. Sweetman, Alycia J. Smith, Daniëlle de Jonge

et al.

Nature Geoscience, Journal Year: 2024, Volume and Issue: 17(8), P. 737 - 739

Published: July 22, 2024

Abstract Deep-seafloor organisms consume oxygen, which can be measured by in situ benthic chamber experiments. Here we report such experiments at the polymetallic nodule-covered abyssal seafloor Pacific Ocean oxygen increased over two days to more than three times background concentration, from ex incubations attribute nodules. Given high voltage potentials (up 0.95 V) on nodule surfaces, hypothesize that seawater electrolysis may contribute this dark production.

Language: Английский

Citations

15
Impacts of Desalination Brine Discharge on Benthic Ecosystems DOI

Ryan Sirota,

Gidon Winters, Oren Levy

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(13), P. 5631 - 5645

Published: March 22, 2024

Seawater reverse osmosis (SWRO) desalination facilities produce freshwater and, at the same time, discharge hypersaline brine that often includes various chemical additives such as antiscalants and coagulants. This dense can sink to sea bottom creep over seabed, reaching up 5 km from point. Previous reviews have discussed effects of SWRO on marine ecosystems, yet little attention has been paid impacts benthic habitats. review comprehensibly discusses fauna flora. We previous studies indicated a suite by organisms, including bacteria, seagrasses, polychaetes, corals. The within mixing zones range impaired activities morphological deformations changes in community composition. Recent modeling work demonstrated could spread beyond zone, for several tens kilometers impair nutrient fluxes sediment water column. also provide possible perspective brine's impact biogeochemical process zone subsurface. Desalination infiltrate into sandy around area due gravity currents. Accumulation associated additives, polyphosphonate-based ferric-based coagulants porewater, may change redox hence, processes sediments. With demand drinking escalating worldwide, volumes are predicted triple during current century. Future efforts should focus development operation viable technologies minimize discharged environments, along with environmentally friendly additives. However, application these be partly subsidized governmental stakeholders safeguard coastal ecosystems facilities.

Language: Английский

Citations

11
Hydrodynamics, Diagenesis and Hypoxia Variably Drive Benthic Oxygen Flux in a River‐Reservoir System DOI Creative Commons

Yuanning Zhang,

Xueping Gao,

Bowen Sun

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(1)

Published: Jan. 1, 2024

Abstract Benthic oxygen flux with complex spatiotemporal variations is essential for the global budget of carbon dioxide and regional security water quality ecology, but its dominant driver under different circumstances has yet to be identified. In this study, a parametric scheme was proposed validated aquatic eddy correlation measurements then coupled diagenesis model environment model. The applied river‐reservoir significant environmental gradients in hydrodynamics, diagenesis, hypoxia, which are three factors that competitively drive variation benthic flux. results indicate hydrodynamics dominate riverine thalweg areas, lacustrine bank hypoxia shows dominance only hypolimnetic anoxic area. general, river‐reservoirs, followed by both more prominent than hypoxia. If operated reservoir experiences wet year, tends increase, while decreases. divers exhibit similar stable systems reservoirs, becomes exclusive fluxes systems.

Language: Английский

Citations

8
Kelp carbon sink potential decreases with warming due to accelerating decomposition DOI Creative Commons
Karen Filbee‐Dexter, Colette J. Feehan, Dan A. Smale

et al.

PLoS Biology, Journal Year: 2022, Volume and Issue: 20(8), P. e3001702 - e3001702

Published: Aug. 4, 2022

Cycling of organic carbon in the ocean has potential to mitigate or exacerbate global climate change, but major questions remain about environmental controls on flux coastal zone. Here, we used a field experiment distributed across 28° latitude, and entire range 2 dominant kelp species northern hemisphere, measure decomposition rates detritus seafloor relation local factors. Detritus both were strongly related temperature initial content, with higher biomass loss at lower latitudes warmer temperatures. Our showed slow overall turnover modeling residence times our study sites revealed that significant portion this production can intact long enough reach deep marine sinks. The results suggest these could accelerate warming low-latitude forests experience greatest increase remineralization 9% 42% reduced for transport long-term sinks under short-term (RCP4.5) (RCP8.5) scenarios. However, high latitudes, where abundance is predicted expand, indicates increasing kelp-carbon cooler (northern) regions. findings reveal an important latitudinal gradient ecosystem function provides improved capacity predict implications cycling. Broad-scale patterns here be identify hotspots sequestration resolve relationships between cycling processes scale.

Language: Английский

Citations

35
Sediment Accumulation and Carbon Burial in Four Hadal Trench Systems DOI Creative Commons
K. Oguri, Pere Masqué, Matthias Zabel

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2022, Volume and Issue: 127(10)

Published: Sept. 26, 2022

Abstract Hadal trenches are considered to act as depocenters for organic material, although pathways the material transport and deposition rates poorly constrained. Here we assess focusing, accumulation of carbon in four hadal trench systems underlying different surface ocean productivities; eutrophic Atacama Kuril‐Kamchatka trenches, mesotrophic Kermadec oligotrophic Mariana Trench. The study is based on distributions naturally occurring 210 Pb ex , 137 Cs total from recovered sediment cores by applying previously quantified benthic mineralization rates. Periods steady discreet mass‐wasting deposits were identified profiles latter associated with historic recorded seismic events respective regions. During periods without mass wasting, estimated focusing factors along axes elevated, suggesting more or less continuous downslope toward interior trenches. during these exhibited extensive site‐specific variability, but generally similar values encountered at much shallower settings such continental slopes margins. Organic not mirrored productivity, appeared confounded local bathymetry. inclusion mediated enhanced accumulations past ∼150 years up a factor ∼4. Thus, due intensified infrequent events, important sites sequestration deep sea.

Language: Английский

Citations

31
Respiration Patterns in the Dark Ocean DOI Creative Commons
Olivier Sulpis, David S. Trossman, Mark Holzer

et al.

Global Biogeochemical Cycles, Journal Year: 2023, Volume and Issue: 37(8)

Published: Aug. 1, 2023

Abstract In the dark ocean, respiring organisms are main sink for dissolved oxygen. The respiration rate in a given seawater volume can be quantified through oxygen drawdown or organic matter consumption as function of time. Estimates utilization rates (OUR) abound literature, but typically obtained using proxies questionable accuracy, often with low vertical resolution, and neglecting key regions such Southern Indian oceans. Respiration based on particulate (POC) (DOC) carbon also sparsely observed DOC unavailable many regions. Consequently, relative contributions POC substrate ocean unknown. Here, we use recent datasets true utilization, age, to derive OUR consumption‐rate profiles 10 oceanic We demonstrate that although globally consistent OUR, they underestimate deep, suggesting strong at seafloor. abyss, find negative correlation reactivity decreases along deep branch conveyor circulation. Our results highlight benthic sensitive perturbations surface production large‐scale circulation changes affect its supply abyss.

Language: Английский

Citations

14
Reconstructing ocean oxygenation changes from U/Ca and U/Mn in foraminiferal coatings: Proxy validation and constraints on glacial oxygenation changes DOI
Rong Hu, Helen Bostock, Julia Gottschalk

et al.

Quaternary Science Reviews, Journal Year: 2023, Volume and Issue: 306, P. 108028 - 108028

Published: March 16, 2023

Language: Английский

Citations

13