Floating Aquatic Macrophytes Decrease the Methane Concentration in the Water Column of a Tropical Coastal Lagoon: Implications for Methane Oxidation and Emission

Fonseca, André Luiz dos Santos; Marinho, Cláudio Cardoso; Esteves, Franscisco de Assis

doi:10.1590/1678-4324-2017160381

Cited by 8 publications

(2 citation statements)

References 62 publications

(52 reference statements)

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“…These results show that co-culturing with PC was more effective in mitigating the GHGI than WS. Previous studies have reported that floating aquatic plants could affect the CH 4 emissions from natural water bodies [23][24][25]. Either reduced or increased CH 4 emissions were observed for the floating aquatic-plants-growing area than the no-plant-growing area, which helped to develop an understanding of the impacts of these plants on O 2 recycling and carbon transformation processes in different aquatic systems [23,24].…”

Section: Nitrogen Utilization Efficiency Gwp Yield and Ghgimentioning

confidence: 96%

Effects of Vegetable–Fish Co-Culture on CH4 and N2O Emissions from an Aquaculture Pond

et al. 2023

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Freshwater aquaculture is an important source of greenhouse gas (GHG) emissions. GHG emissions are expected to lead to global warming and climate change. A reduction in GHG emissions is urgently required for the sustainable development of freshwater aquaculture. In this study, a laboratory-scale experiment was conducted to analyze the effects of a vegetable–fish co-culture on CH4 and N2O emissions from a freshwater aquaculture pond. The results show that the co-culturing of yellow catfish with pak choi (PC-F) or water spinach (WS-F) significantly reduced the N2O emission from the aquaculture pond by 60.20% and 67.71%, respectively, as compared with a yellow catfish monoculture (F). However, the co-culture of these two vegetables did not affect the level of CH4 emissions. The reduction in N2O emissions was primarily attributed to the decrease in the concentration of N2O and NO3− in the water. The overall global warming potential (GWP) of CH4 and N2O was significantly reduced by 19.1% with PC-F compared to F, but it did not significantly differ between WS-F and F. PC and WS cultivation improved the food yield by 1555.52% and 419.95% compared to F, respectively. Consequently, the GHG emissions intensity (GHGI) under PC-F and WS-F decreased by 96.15% and 80.77% compared to F, respectively. Altogether, the results highlight that a vegetable–fish co-culture is likely an efficient system for mitigating GWP per unit of food yield in freshwater aquaculture ponds. These results can provide a reference for the mitigation of GHG emissions from freshwater aquaculture.

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Section: Nitrogen Utilization Efficiency Gwp Yield and Ghgimentioning

confidence: 96%

Effects of Vegetable–Fish Co-Culture on CH4 and N2O Emissions from an Aquaculture Pond

et al. 2023

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“…In a Patagonian bog colonized by cushion plants (Astelia pumila and Donatia fascicularis), intense CH 4 oxidation as a result of ROL suppressed CH 4 emissions completely (Fritz et al, 2011). ROL can also occur in floating plants and adventitious roots, reducing dissolved CH 4 concentrations in the water column (Visser et al, 2000;Kosten et al, 2016;Fonseca et al, 2017).…”

Section: Ch Oxidationmentioning

confidence: 99%

Methane dynamics in vegetated habitats in inland waters: quantification, regulation, and global significance

Bodmer,

Vroom,

Stepina

et al. 2024

Front. Water

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Freshwater ecosystems, including lakes, wetlands, and running waters, are estimated to contribute over half the natural emissions of methane (CH4) globally, yet large uncertainties remain in the inland water CH4 budget. These are related to the highly heterogeneous nature and the complex regulation of the CH4 emission pathways, which involve diffusion, ebullition, and plant-associated transport. The latter, in particular, represents a major source of uncertainty in our understanding of inland water CH4 dynamics. Many freshwater ecosystems harbor habitats colonized by submerged and emergent plants, which transport highly variable amounts of CH4 to the atmosphere but whose presence may also profoundly influence local CH4 dynamics. Yet, CH4 dynamics of vegetated habitats and their potential contribution to emission budgets of inland waters remain understudied and poorly quantified. Here we present a synthesis of literature pertaining CH4 dynamics in vegetated habitats, and we (i) provide an overview of the different ways the presence of aquatic vegetation can influence CH4 dynamics (i.e., production, oxidation, and transport) in freshwater ecosystems, (ii) summarize the methods applied to study CH4 fluxes from vegetated habitats, and (iii) summarize the existing data on CH4 fluxes associated to different types of aquatic vegetation and vegetated habitats in inland waters. Finally, we discuss the implications of CH4 fluxes associated with aquatic vegetated habitats for current estimates of aquatic CH4 emissions at the global scale. The fluxes associated to different plant types and from vegetated areas varied widely, ranging from−8.6 to over 2835.8 mg CH4 m−2 d−1, but were on average high relative to fluxes in non-vegetated habitats. We conclude that, based on average vegetation coverage and average flux intensities of plant-associated fluxes, the exclusion of these habitats in lake CH4 balances may lead to a major underestimation of global lake CH4 emissions. This synthesis highlights the need to incorporate vegetated habitats into CH4 emission budgets from natural freshwater ecosystems and further identifies understudied research aspects and relevant future research directions.

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Dynamics of methane emissions from northwestern Gulf of Mexico subtropical seagrass meadows

Yu,

Coffin,

Organ

2024

Biogeochemistry

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While seagrass meadows are perceived to be pertinent blue carbon reservoirs, they also potentially release methane (CH4) into the atmosphere. Seasonal and diurnal variations in CH4 emissions from a subtropical hypersaline lagoon dominated by Halodule wrightii in southern Texas, USA, on the northwest coast of the Gulf of Mexico were investigated. Dissolved CH4 concentrations decreased in the daytime and increased overnight during the diel observation period, which could be explained by photosynthesis and respiration of seagrasses. Photosynthetic oxygen was found to significantly reduce CH4 emissions from seagrass sediment. Diffusive transport contributed slightly to the release of CH4 from the sediment to the water column, while plant mediation might be the primary mechanism. The diffusive CH4 flux at the sea-air interface was 12.3–816.2 µmol/m2 d, over the range of the sea-air fluxes previously reported from other seagrass meadows. This was related to relatively higher dissolved CH4 concentrations (11.6–258.2 nmol/L) in a mostly closed lagoon with restricted water exchange. This study emphasizes seagrass meadows in the subtropical hypersaline lagoon as a source of atmospheric CH4, providing insights into the interactions between seagrass ecosystems and methane dynamics, with potential implications for seagrass meadow management and conservation efforts.

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Floating Aquatic Macrophytes Decrease the Methane Concentration in the Water Column of a Tropical Coastal Lagoon: Implications for Methane Oxidation and Emission

Abstract: In wetlands, the knowledge accumulated on the role of aquatic plants in the methane

Cited by 8 publications

References 62 publications

Effects of Vegetable–Fish Co-Culture on CH4 and N2O Emissions from an Aquaculture Pond

Effects of Vegetable–Fish Co-Culture on CH4 and N2O Emissions from an Aquaculture Pond

Methane dynamics in vegetated habitats in inland waters: quantification, regulation, and global significance

Dynamics of methane emissions from northwestern Gulf of Mexico subtropical seagrass meadows

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