Drivers of Seasonal and Diel Methane Emissions From a Seagrass Ecosystem DOI Creative Commons
Linnea Henriksson, Yvonne Y. Y. Yau, Claudia Majtényi‐Hill

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(11)

Published: Nov. 1, 2024

Abstract Seagrass meadows are effective sinks of atmospheric carbon dioxide (CO 2 ). However, there is little insight on how methane (CH 4 ) emissions may potentially offset sequestration in seagrass meadows. Here, we resolve diel and seasonal dynamics CH CO water‐air fluxes over a cold‐temperate Zostera marina meadow using high‐resolution timeseries observations seawater. was emitted from the seagrass‐dominated coastal bay year‐round to atmosphere with ranging 0.2 2.6 μmol m −2 d −1 . These at lower end earlier estimates based mostly short‐term (i.e., 1 day) observations. The 13‐fold fluctuations were greater than 6‐fold fluctuation. Radon imply that dissolved primarily originated sediment porewater. main fate water outgassing via wind forcing. Oxygen temperature partially controlled dynamics. There an annual average uptake (−0.9 ± 1.5 mmol driven by enhanced photosynthesis spring summer. ‐equivalent (0.5 0.6 g eq yr offsets only 0.8% accumulation this Z. 20‐year time horizon. flux 6% uptake. Hence, acted as minor sequestration.

Language: Английский

Blue carbon assessments of seagrass and mangrove ecosystems in South and Southeast Asia: Current progress and knowledge gaps DOI
Milica Stankovic, Amrit Kumar Mishra, Yusmiana P. Rahayu

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 904, P. 166618 - 166618

Published: Aug. 27, 2023

Language: Английский

Citations

28
Groundwater releases CO 2 to diverse global coastal ecosystems DOI Creative Commons
Aprajita Singh Tomer, Tristan McKenzie, Claudia Majtényi‐Hill

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(2)

Published: Jan. 10, 2025

Coastal ecosystems play a major role in marine carbon budgets, but substantial uncertainties remain the sources and fluxes of coastal dioxide (CO 2 ). Here, we assess when, where, how submarine groundwater discharge (SGD) releases CO to shallow ecosystems. Time-series observations dissolved radon ( 222 Rn, natural tracer) across 40 systems from 14 countries revealed large SGD-derived fluxes. The mean partial pressure was 35 times higher than surface seawater. flux 148 ± 226 millimoles per square meter day (mmol m −2 −1 ), resulting water-air 80 133 mmol . Tidal rather diel cycles drove enrichment most Tidally driven SGD primary source mangroves, salt marshes, tidal flats, estuaries, canals. Overall, expand current knowledge by demonstrating as an important that requires inclusion budgets.

Language: Английский

Citations

1
Recommendations for strengthening blue carbon science DOI Creative Commons
Martin Dahl, Paul S. Lavery, Inés Mazarrasa

et al.

One Earth, Journal Year: 2025, Volume and Issue: unknown, P. 101175 - 101175

Published: Feb. 1, 2025

Language: Английский

Citations

1
High Methane Production and Emission From Tropical Seagrasses Through Methylotrophic Methanogenesis DOI Creative Commons
Guiyuan Dai, Xiaogang Chen, Guangchao Zhuang

et al.

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(5)

Published: Feb. 28, 2025

Abstract Methane (CH 4 ) is a potent greenhouse gas that reduces the carbon sequestration capacity of seagrass meadows. However, our understanding CH production and emission from these important sinks limited. Here we conducted biogeochemical experiments to identify methylotrophic methanogenesis as primary pathway in tropical meadow. The rate constant was 2.2–3.9 d −1 , significantly higher than those temperate meadows (<0.02 ). meadow 835 ± 124 μmol m −2 . A global meta‐analysis further revealed approximately 8 times Global emit 0.3 Tg yr with over 90% resulting an 8.6% reduction burial on 20‐year time horizon. These findings highlight role sources, which can offset benefits sequestration.

Language: Английский

Citations

0
Seagrass Carbon Stocks And Sequestration In Habitat Impacted By Tin Mining Activities In Bangka Belitung, Indonesia DOI Creative Commons
Wahyu Adi, Agus Hartoko,

Pujiono Wahyu Purnomo

et al.

GEOGRAPHY ENVIRONMENT SUSTAINABILITY, Journal Year: 2025, Volume and Issue: 18(1), P. 97 - 104

Published: April 8, 2025

Seagrass meadows are important blue carbon ecosystems. They threatened by various anthropogenic activities, including mining, which affect the ecological health. This study investigates impact of sea-based tin mining activities on storage capabilities seagrass in Bangka Belitung, Indonesia. The objective is to quantify stocks and sequestrations these ecosystems understand how influences critical natural resources. research was conducted at sites with different levels impacts. Carbon sequestration were measured using Loss Ignition method, net primary productivity calculated. Remote sensing data from Landsat 7 Sentinel-2A satellites used monitor changes cover over time. Sedimentation rates total suspended solids assess environmental Statistical analysis, correlation cluster examined relationship between activity findings indicate a significant decrease coverage areas high mining. Specifically, intensive showed higher sedimentation solids, correlated reduced biomass sequestration. compromises role as effective sinks, highlighting destructive

Language: Английский

Citations

0
Seagrass carbon stocks and fluxes in the Marine and Coastal Protected Area of Kerkennah Archipelago, East Tunisia DOI
Rym Zakhama‐Sraieb,

Imen Zribi,

Nada Abdelkader

et al.

Marine Pollution Bulletin, Journal Year: 2025, Volume and Issue: 216, P. 118007 - 118007

Published: April 22, 2025

Language: Английский

Citations

0
Dynamics of methane emissions from northwestern Gulf of Mexico subtropical seagrass meadows DOI Creative Commons
Hao Yu, Richard B. Coffin,

Hannah Organ

et al.

Biogeochemistry, Journal Year: 2024, Volume and Issue: 167(5), P. 723 - 741

Published: April 23, 2024

Abstract While seagrass meadows are perceived to be pertinent blue carbon reservoirs, they also potentially release methane (CH 4 ) into the atmosphere. Seasonal and diurnal variations in CH emissions from a subtropical hypersaline lagoon dominated by Halodule wrightii southern Texas, USA, on northwest coast of Gulf Mexico were investigated. Dissolved concentrations decreased daytime increased overnight during diel observation period, which could explained photosynthesis respiration seagrasses. Photosynthetic oxygen was found significantly reduce sediment. Diffusive transport contributed slightly sediment water column, while plant mediation might primary mechanism. The diffusive flux at sea-air interface 12.3–816.2 µmol/m 2 d, over range fluxes previously reported other meadows. This related relatively higher dissolved (11.6–258.2 nmol/L) mostly closed with restricted exchange. study emphasizes as source atmospheric , providing insights interactions between ecosystems dynamics, potential implications for meadow management conservation efforts.

Language: Английский

Citations

2
Efficient oxidation attenuates porewater‐derived methane fluxes in mangrove waters DOI Creative Commons
Yvonne Y. Y. Yau, Alex Cabral, Gloria Reithmaier

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(9), P. 1997 - 2014

Published: Aug. 13, 2024

Abstract Mangroves store significant amounts of carbon in both sediment and water. Methane (CH 4 ) is often produced anoxic, organic‐rich sediments during degradation released to overlying waters via porewater exchange. Yet, a portion CH can be oxidized CO 2 before emission. Here, we investigate whether oxidation impacts its emissions using high‐temporal resolution concentration stable isotope (δ 13 C‐CH observations collected over 14 tidal cycles Brazilian mangrove creeks with no river inputs. We found higher concentrations (~ 150 nM) more depleted C (−75‰) low tide than high at creeks. Similar δ values between surface porewaters further suggest tidally driven exchange as the main source . More C‐enriched deep indicate partial prior atmosphere. A mass balance revealed that 17–58% was rates 3–25 μ mol m −2 d −1 water column larger (45–61%) creek waters. The two had average water–air fluxes 51–109 spring‐neap cycles. These aquatic offset only < 3% mangroves' soil sequestration. Overall, attenuated

Language: Английский

Citations

2
Seagrass population dynamics and biodiversity assemblages indicate negative effects of short-term nutrient enrichment in tropical island ecosystem DOI Creative Commons
Amrit Kumar Mishra,

Raihana Rasheed,

Syed Hilal Farooq

et al.

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 373, P. 123797 - 123797

Published: Dec. 23, 2024

Language: Английский

Citations

1
Seasonal variability and seagrass traits affect methane fluxes in a subtropical meadow DOI Creative Commons
Alexandra L. Bijak, Laura K. Reynolds, Willm Martens‐Habbena

et al.

Journal of Ecology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 23, 2024

Abstract Plant traits which vary both within and between species often drive biogeochemical cycling. Understanding the relative role of within‐ between‐species trait variability in driving carbon cycling is essential to scaling site measurements global budgets. In seagrass meadows, nitrogen mineralization rates associated greenhouse gas emissions are highly variable, impeding our ability reliably predict whether meadows net sinks. Evaluating influence on fluxes will improve understanding local‐scale drivers production consumption meadows. To test effects plant dissolved fluxes, we performed mesocosm incubations with live, intact plants. We compared methane (CH 4 ) nitrous oxide (N 2 O) under dark light conditions from sediments dominated by Halodule wrightii Thalassia testudinum across dormant, early peak growing seasons a subtropical meadow along west coast peninsular Florida. also measured oxygen (O interpret context community metabolism. several traits, such as above‐ below‐ground biomass leaf root area assessed their impact well identity fluxes. found that abiotic factors linked metabolism (i.e. temperature) influenced seasons. addition sampling month, size (a composite variable) was significant predictor O CH conditions, better predicted than individual traits. slightly higher H. ‐dominated sediments, but less important production. N were low not or identity. Synthesis : Our results indicate within‐species more so drives direction magnitude identified trade‐off where enhanced sediment storage, study, promoted production, potentially offsetting benefits long‐term storage.

Language: Английский

Citations

0