Identifying and protecting macroalgae detritus sinks toward climate change mitigation

Ecological Applications, Journal Year: 2022, Volume and Issue: 33(3)

Published: Dec. 11, 2022

Harnessing natural solutions to mitigate climate change requires an understanding of carbon fixation, flux, and sequestration across ocean habitats. Recent studies have suggested that exported seaweed particulate organic is stored within soft-sediment systems. However, very little known about how detritus disperses from coastlines, or where it may enter seabed stores, could become the target conservation efforts. Here, focusing on regionally dominant species, we surveyed environmental DNA (eDNA) coastal sediments, studied their connectivity habitats using a particle tracking model parameterized reproduce dispersal behavior based laboratory observations fragment degradation sinking. Experiments showed density changed over time, differently species. This, in turn, modified distances traveled by released fragments until they reached for first during simulations. Dispersal pathways connected shore open but, importantly, also this was reflected field eDNA evidence. Dispersion were affected hydrodynamic conditions, varying space time. Both properties timing detritus, individual each macroalgal population, short-term near-seabed medium-term water-column transport pathways, are thus seemingly important determining between potential sedimentary sinks. Studies such as one, supported further verification rates source partitioning, still needed help quantify role cycle. Such will provide vital evidence inform need develop blue mechanisms, beyond wetlands.

Language: Английский

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Variability in the Net Ecosystem Productivity (NEP) of Seaweed Farms

Frontiers in Marine Science, Journal Year: 2022, Volume and Issue: 9

Published: May 24, 2022

The important role of vegetated ecosystems in the sequestration carbon has gained strong interest across a wide variety disciplines. With evidence growing potential for macroalgae to capture carbon, there is burgeoning applying newfound knowledge rates better understand sequestration. Seaweed farms are expected play significant capture; advocates expansion seaweed increasing many countries. In general, be highly productive, although whether they autotrophic or heterotrophic and hence exporters under debate. Therefore, we present our investigation three farms, two northern Japan one southern Japan. We examine frequency days compare with natural degraded site. estimated by calculating net ecosystem productivity from continuous recordings dissolved oxygen concentrations environmental conditions. production Arikawa Bay Omura were equivalent 0.043 0.054 [g C m -2 d -1 ] , respectively. Whereas, Tainoura Bay, it was -0.01 . reveal that Undaria pinnatifida farm Matsushima experience autotrophy more often than ecosystems, producing U. Hirota Cladospihon okamuranus at Bise Point, less frequently observed. Nevertheless, up 14.1 g (0.110 ) captured 3.6 (0.034 C. total yield during 2021 season these 43,385 kg

Language: Английский

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Macroalgal habitats support a sustained flux of floating biomass but limited carbon export beyond a Greenland fjord

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 872, P. 162224 - 162224

Published: Feb. 15, 2023

Despite growing attention on the contribution of macroalgae to carbon cycling and sequestration (blue carbon), more observational data is needed constrain current estimates. In this study, we estimate floating macroalgal flux within beyond a large sub-Arctic fjord system, Nuup Kangerlua, Greenland, which could potentially reach sinks. Our study estimates 1) fjord-scale area with coverage barrens caused by sea urchin grazing, 2) biomass in fjord, 3) annual export out system. ROV surveys documented that habitats cover 32 % seafloor photic zone (0-30 m) an average 39.6, 22, 7.2 depth intervals 0–10, 10–20, 20-30 m, respectively. 15 suitable for was denuded grazing. Floating were common 55 kg wet weight km−2. Densities species composition varied seasonally highest levels after storms. The composed intertidal (58 %) (Fucus vesiculosus, Fucus distichus, Ascophyllum nodosum) kelps (42 (Saccharina longicruris, S. latissima, Alaria esculenta). We deployed surface GPS drifters simulate trajectories velocity. Data indicated 80 retained where its fate relation long-term unknown. Export limited only 6.92 t C yr−1, equal ~0.02 net primary production. findings suggest support blue potential future research should focus subsurface resolve connectivity between

Language: Английский

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Differential effects of warming on carbon budget, photosynthetic yield and biochemical composition of cold-temperate and Arctic isolates of Laminaria digitata (Phaeophyceae)

Journal of Plant Physiology, Journal Year: 2025, Volume and Issue: 306, P. 154436 - 154436

Published: Jan. 22, 2025

Cold-temperate and Arctic hard bottom coastal ecosystems are dominated by kelp forests, which have a high biomass production provide important ecosystem services, but subject to change due ocean warming. However, the photophysiological response increasing temperature of ecologically relevant species, such as Laminaria digitata, might depend on local thermal environment where population has developed. Therefore, effects growth rate, biochemical composition, maximum quantum yield, photosynthetic quotient carbon budget young cultured sporophytes digitata from at Spitsbergen (SPT; 4, 10 16 °C) cold-temperate North Sea island Helgoland (HLG; 10, 22 were comparatively analyzed. Temperature significantly affected rates L. SPT HLG, with highest occurring °C, did not differ between both isolates neither °C nor °C. Nevertheless, yield fixation rate 4 for digitata. Significantly higher oxygen observed in relative Artic respectively. Neither biogeographic region origin quotient, release dissolved or particulate organic carbon. Total mannitol content compared revealing an increased accumulation storage compounds latitude We conclude that HLG their sensitivity temperatures is likely benefit warming, while temperate will be negatively further increases ambient temperature.

Language: Английский

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Blue Carbon in an eastern boundary Upwelling Zone – A case study in Namibia

Deep Sea Research Part II Topical Studies in Oceanography, Journal Year: 2025, Volume and Issue: unknown, P. 105478 - 105478

Published: March 1, 2025

Language: Английский

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Carbon retention in the stipe of kelp Eisenia bicyclis revealed by underwater decomposition experiments

Journal of Applied Phycology, Journal Year: 2025, Volume and Issue: unknown

Published: May 13, 2025

Language: Английский

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Temporal and spatial drivers of the structure of macroinvertebrate assemblages associated with Laminaria hyperborea detritus in the northeast Atlantic

Marine Environmental Research, Journal Year: 2024, Volume and Issue: 198, P. 106518 - 106518

Published: April 16, 2024

Kelp forests occur on more than a quarter of the world's coastlines, serving as foundation species supporting high levels biodiversity. They are also major source organic matter in coastal ecosystems, with majority primary production released and exported detritus. detritus provides food shelter for macroinvertebrates, which comprise important components inshore food-webs. Hitherto, research kelp detritus-associated macroinvertebrate assemblages remains relatively limited. We quantified spatiotemporal variability structure within Laminaria hyperborea evaluated influence putative drivers observed across eight study sites four regions United Kingdom May September 2015. documented 5,167 individuals from 106 taxa Malacostraca, Gastropoda, Isopoda Bivalvia most abundant groups sampled. Assemblage varied months, sites, regions, highest richness compared to May. Many were unique individual few all regions. Finally, key assemblage included tissue nitrogen content, depth, sea surface temperature, light intensity, well L. canopy density biomass. Despite their dynamic composition transient existence, accumulations represent valuable repositories biodiversity an additional forest component influences secondary productivity, potentially food-web dynamics.

Language: Английский

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Seasonal and spatial variability in rates of primary production and detritus release by intertidal stands of Laminaria digitata and Saccharina latissima on wave‐exposed shores in the northeast Atlantic

Ecology and Evolution, Journal Year: 2023, Volume and Issue: 13(6)

Published: June 1, 2023

Coastal habitats are increasingly recognized as fundamentally important components of global carbon cycles, but the rates flow associated with marine macrophytes not well resolved for many species in regions. We quantified density, primary productivity, and detritus production intertidal stands two common kelp species-

Language: Английский

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Quantifying growth, erosion and dislodgement rates of farmed kelp (Saccharina latissima) to examine the carbon sequestration potential of temperate seaweed farming

Journal of Applied Phycology, Journal Year: 2024, Volume and Issue: 36(5), P. 3091 - 3102

Published: July 31, 2024

Abstract Seaweed cultivation, including kelp species, is rapidly expanding in many regions. A widely assumed co-benefit of seaweed farming increased local carbon sequestration rates (thereby contributing to climate change mitigation), although direct field-based measurements assimilation and release are largely lacking. We quantified growth, erosion dislodgement farmed Saccharina latissima Porthallow Bay (Cornwall, UK) throughout a typical cultivation season provide insights into the potential small-scale farms. Blade elongation from ~ 1.3 cm day −1 2.3 March–April, before declining 1.4 by May. Meanwhile, remained low, ranging 0.5 0.8 . Dislodgement decreased 20% plants January–February 5% April–May. Rates accumulation loss January May, related an increase standing stock. Conservative first-order estimates suggest that farm captures 0.14 t C ha y , which up 70% released environment as particulate organic carbon. Based on previous burial storage rates, may sequester 0.05 CO 2 e These values scaling-up European should be motivated other co-benefits, such low-carbon product alternatives, job creation biodiversity gains, not solely driven perceived meaningful sequestration. Importantly, further information needs obtained variety sites develop better understanding dynamics associated with

Language: Английский

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The influence of light and temperature on detritus degradation rates for kelp species with contrasting thermal affinities

Marine Environmental Research, Journal Year: 2021, Volume and Issue: 173, P. 105529 - 105529

Published: Nov. 14, 2021

Language: Английский

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