Ocean acidification and global warming may favor blue carbon service in a Cymodocea nodosa community by modifying carbon metabolism and dissolved organic carbon fluxes

Marine Pollution Bulletin, Journal Year: 2025, Volume and Issue: 212, P. 117501 - 117501

Published: Jan. 4, 2025

Language: Английский

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Long-term sediment organic carbon remineralization in different seagrass and macroalgae habitats: implication for blue carbon storage

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: March 25, 2024

Seagrass and macroalgae beds are key blue carbon ecosystems in the ocean. However, coastal development climate change sparking a growing concern about vulnerability of sediment organic (OC) to remineralization after macrophyte perturbation. Thus, aim this study was assess potential long-term OC stocks (1 year) vegetated habitats (i.e., seagrasses Zostera noltei Cymodocea nodosa , Caulerpa prolifera unvegetated sediment) complete disturbance meadows under conducive conditions microorganisms growth oxygen saturated, non-nutrient limitation, turbulence dark). Leached dissolved (DOC) from particulate (POC) remineralization, carbonate dissolution photo-reactivity persistent DOC were also evaluated. Our results evidenced that, Z. entirely remineralized CO 2 . C. communities exhibited significant fraction recalcitrant OC, therefore, 42 46% still remained 1 year culture, respectively. POC released relevant amounts both labile DOC, which showed low photo-reactivity. Finally, we discuss that main argument promote management, monitoring, restoration programs for macrophytes is usually based on their deposit, favor larger species. The presented here adds arguments include small species, since may be highly once these disturbed.

Language: Английский

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Selective herbivory on necrotic tissue can promote tolerance to abiotic disturbances in the seagrass Cymodocea nodosa

Marine Environmental Research, Journal Year: 2025, Volume and Issue: 207, P. 107064 - 107064

Published: March 6, 2025

Language: Английский

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Dissolved organic carbon leaching from microplastics and bioavailability in coastal ecosystems

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 909, P. 168673 - 168673

Published: Nov. 18, 2023

The dissolved organic carbon (DOC) leached from two types of microplastics (polyethylene and polypropylene) frequently found in coastal areas were evaluated situ. Subsequently, the bioavailability DOC was assessed for microbial inocula different communities (i.e., estuarine open-coastal waters, river-mouth waters seagrass beds). Leached largely biodegradable (as much as 85 %). However, beds exhibited lower utilization efficiency than probably because differences their communities. labile/recalcitrant ratio plastic similar under illuminated dark conditions, whereas polyethylene, rather polypropylene, preferentially used by We estimated that many 21,000 metric tons plastics may be released into ocean annually. Our results support need to consider potential impacts pollution on communities, including consideration trophic webs cycle.

Language: Английский

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Seagrass decline weakens sediment organic carbon stability

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 937, P. 173523 - 173523

Published: May 25, 2024

Language: Английский

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Nutrient enrichment and herbivory alter carbon balance in temperate seagrass communities

Marine Pollution Bulletin, Journal Year: 2024, Volume and Issue: 206, P. 116784 - 116784

Published: July 30, 2024

Large nutrient levels and herbivory stress, particularly when acting together, drive a variety of responses in seagrass communities that ultimately may weaken their carbon balance. An situ three-months experiment was carried out two contrasting seasons to address the effects load three artificial clipping on Cymodocea nodosa plants. Nutrient enrichment shifted community from autotrophic heterotrophic reduced DOC fluxes winter, whereas enhanced metabolism summer. Herbivory stress decreased net primary production both seasons, release increased winter but A reduction food-web structure observed under disturbances evidencing impacts ecosystems services by altering transfer process loss superficial OC, which finally blue storage capacity these communities.

Language: Английский

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Patch age alters seagrass response mechanisms to herbivory damage

Marine Environmental Research, Journal Year: 2024, Volume and Issue: 197, P. 106443 - 106443

Published: March 15, 2024

Natural disturbances can produce a mosaic of seagrass patches different ages, which may affect the response to herbivory. These pressures have consequences for plant performance. To assess how patch age affects herbivory, we simulated effect herbivory by clipping leaves Halodule wrightii in 2, 4 and 6 years. All clipped plants showed ability compensate increasing leaf growth rate (on average 4.5-fold). The oldest resistance phenolic compounds (1.2-fold). Contrastingly, concentration phenolics decreased youngest (0.26-fold), although they had similar carbon content controls. results suggest that younger facing pressure reallocate their towards primary metabolism. Results confirm H. tolerance damage provides evidence age-dependent compensatory responses, colonization perturbed habitats.

Language: Английский

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Improving Carbon Budgets by Accounting for Inorganic Carbon in Seagrass Ecosystems

Global Change Biology, Journal Year: 2025, Volume and Issue: 31(2)

Published: Feb. 1, 2025

ABSTRACT While seagrass ecosystems are acknowledged for their role as blue carbon sinks, significant uncertainties remain regarding the sequestration of sediment inorganic (SIC) and its broader implications cycling. These knowledge gaps hinder a comprehensive assessment contribution to global budget. To address this gap, drivers sources SIC in nine tropical Indo‐Pacific were analyzed using partial least squares path modeling oxygen isotopes binding Bayesian mixing models. We found that content varies regionally, ranging from 0.03% 10.18%, is positively correlated with biomass, temperature, salinity, coarse‐grained sediment. stocks ranged 1.53 203.17 Mg C ha −1 , confirming pool SIC. stock beneath generally higher than those unvegetated areas due capacity trap particles canopy. affected by runoff mainly terrestrial inputs. Conversely, under regulated seawater primarily derived local production inputs adjacent fish farming wastewater. This study provides robust method enhance accuracy accounting inclusion burial.

Language: Английский

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Carbon and nitrogen stocks in sediment at Península Valdés Biosphere Reserve: novel insights into the potential contribution of large marine vertebrates to carbon sequestration

Frontiers in Marine Science, Journal Year: 2025, Volume and Issue: 12

Published: Feb. 14, 2025

Although policymakers and stakeholders are beginning to acknowledge the importance of marine biosphere in blue carbon services, role large vertebrates nitrogen cycle especially sequestration has not yet been fully understood. Large store only a small percentage total oceanic their bodies, but they can provide important lasting contributions flux. The Península Valdés Biosphere Reserve southwestern Argentina was partially established conserve these vertebrates, including South American sea lion ( Otaria flavescens ) southern right whale Eubalaena australis ). Three locations Peninsula were sampling for proximity vertebrate populations area presence salt marshes assess organic (OC) (TN) stocks top 1 m sediment. Our work provides first quantitative data on OC TN sequestered coastal sediments shows that this protected contributes significantly by storing relevant quantities (140 317 Mg ha -1 (7.3 22.9 Specifically, we found terrestrial plants main C sources each sediment core, non-negligible proportion (from 0.8 6.8% dry weight) showed an isotopic signal from usually inhabit area. Therefore, our results novel hypotheses about potential contribution as vector systems may serve basis further investigation into carbon.

Language: Английский

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Carbon storage of seagrass ecosystems may experience tipping points in response to anthropogenic stress - a modeling perspective

Frontiers in Complex Systems, Journal Year: 2025, Volume and Issue: 3

Published: March 18, 2025

Coastal Blue Carbon ecosystems like seagrass meadows are foundation habitats with a capacity to sequester and store organic carbon in their sediments, protection restoration may thereby support climate change mitigation while also supporting biodiversity many other ecosystem functions. However, being lost due human activities, disease and, some regions, change, which trigger the release of stored into atmosphere. Yet, we do not fully understand how global change-induced loss influences sedimentary dynamics. What is even less clear whether result tipping points, i.e. , abrupt difficult-to-reverse shifts, flux dynamics turning from net sinks sources. Here, propose that conceptual mechanistic models coupled ecological biogeochemical can help study effects major stressors on associated fluxes. We then illustrate one case such model focuses anthropogenic induced mortality by physical stress as an example. Our perspective highlights modeling approach for understanding response fluxes be useful informing coastal management towards actions.

Language: Английский

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