Using Multi-Homologue Plant-Wax Carbon Isotope Signatures to Reconstruct Tropical Vegetation Types DOI Open Access
Christoph Häggi, Dailson José Bertassoli, Thomas Kenji Akabane

et al.

Authorea (Authorea), Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 21, 2023

The stable carbon isotope composition (δ13C) of plant components such as wax biomarkers is an important tool for reconstructing past vegetation. Plant δ13C mainly controlled by photosynthetic pathways, allowing the differentiation C4 tropical grasses and C3 forests. Proxy interpretations are however complicated additional factors aridity, vegetation density, elevation, considerable variability found among species. Moreover, studies on in soils plants have focused Africa, while structurally different South American savannas, shrublands forests remain understudied. Here, we analyze long-chain n-alkanes fatty acids from leaf litter to assess isotopic each type investigate influence climatic features δ13C. Rainforests open types show distinct values, with rainforests having a narrow range low values (n-C29 n-alkane: -34.5 +0.9/-0.6 ‰ ; Suess-effect corrected) detection even minor incursions savanna into (13C-enriched). While Cerrado savannas semi-arid Caatinga grow under distinctly climates, they can yield indistinct most compounds. pronounced spreads between n-C33 n-C29 alkanes, consistent across two homologues, thereby enabling these types. same multi-homologue analysis be extended differentiate African savannas.

Language: Английский

Emerging Trends in Food Process Engineering: Integrating Sensing Technologies for Health, Sustainability, and Consumer Preferences DOI Creative Commons
Mir Waqas Alam, Jothi Vinoth Kumar, Mohammed Awad

et al.

Journal of Food Process Engineering, Journal Year: 2025, Volume and Issue: 48(1)

Published: Jan. 1, 2025

ABSTRACT The food processing industry, a significant global economic driver, encompasses diverse sectors ranging from agriculture to service and is currently undergoing transformative changes fueled by engineering innovations, evolving consumer preferences, regulatory demands. Cutting‐edge advancements in technology, such as precision agriculture, intelligent packaging, advanced methods like high‐pressure 3D printing, are revolutionizing efficiency sustainability. These innovations reducing waste, improving safety, enhancing traceability throughout the supply chain. Simultaneously, demands for healthier, sustainable, ethically produced reshaping product offerings. Emerging trends include functional foods, clean labels, plant‐based diets, personalized nutrition, allergen‐free products, all reflecting focus on health wellness. Sustainability remains critical priority, with emphasis eco‐friendly farming practices, waste reduction, biodegradable or recyclable packaging solutions. Digital technologies IoT, blockchain, artificial intelligence, robotics operational transparency. Intelligent featuring embedded sensors monitoring freshness quality further bolstering confidence chain efficiency. position industry address challenges, ensuring security, sustainability while adapting dynamic market

Language: Английский

Citations

4
New global lacustrine brGDGTs temperature calibrations based on machine learning DOI Creative Commons
Zeyang Zhu, Jing Wu, Guoqiang Chu

et al.

Quaternary Science Reviews, Journal Year: 2025, Volume and Issue: 357, P. 109319 - 109319

Published: March 26, 2025

Language: Английский

Citations

0
A novel method to advance the brGDGTs-based paleoclimate reconstruction applicable to different terrestrial environments DOI

Liping Tian,

Mengyuan Wang, Cong Chen

et al.

Quaternary Science Reviews, Journal Year: 2024, Volume and Issue: 328, P. 108540 - 108540

Published: Feb. 14, 2024

Language: Английский

Citations

3
Interlaboratory Comparison of Branched GDGT Temperature and pH Proxies Using Soils and Lipid Extracts DOI Creative Commons
Cindy De Jonge, Francien Peterse, Klaas G.J. Nierop

et al.

Geochemistry Geophysics Geosystems, Journal Year: 2024, Volume and Issue: 25(7)

Published: July 1, 2024

Abstract Ratios of glycerol dialkyl tetraethers (GDGT), which are membrane lipids bacteria and archaea, at the base several paleoenvironmental proxies. They frequently applied to soils as well lake‐ marine sediments generate records past temperature soil pH. To derive meaningful environmental information from these reconstructions, high analytical reproducibility is required. Based on submitted results by 39 laboratories across world, employ a diverse range quantification methods, we explored brGDGT‐based proxies (MBT′ 5ME , IR, #rings tetra ) measured four samples lipid extracts. Correct identification integration 5‐ 6‐methyl brGDGTs prerequisite for robust calculation proxy values, but this can be challenging indicated large inter‐interlaboratory variation. The exclusion statistical outliers improves reproducibility, where remaining uncertainty translates into offset median values 0.3–0.9°C pH 0.05–0.3. There no apparent systematic impact extraction method sample preparation steps brGDGT ratios. Although reported GDGT concentrations generally consistent within laboratories, they vary greatly between laboratories. This variability in may relate variations ionization efficiency or specific mass spectrometer settings possibly impacting response masses relative that internal standard used. While ratio comparable, quantities currently not compared

Language: Английский

Citations

3
Using Multi‐Homolog Plant‐Wax Carbon Isotope Compositions to Reconstruct Tropical Vegetation Types DOI Creative Commons
Christoph Häggi, Dailson José Bertassoli,

T. Akabane

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2024, Volume and Issue: 129(4)

Published: April 1, 2024

Abstract The stable carbon isotope composition (δ 13 C) of plant components such as wax biomarkers is an important tool for reconstructing past vegetation. Plant δ C mainly controlled by photosynthetic pathways, allowing the differentiation 4 tropical grasses and 3 forests. Proxy interpretations are however complicated additional factors aridity, vegetation density, elevation, considerable variability found among species. Moreover, studies on in soils plants have focused Africa, while structurally different South American savannas, shrublands rainforests remain understudied. Here, we analyze long‐chain n‐ alkanes fatty acids from leaf litter to assess isotopic each type investigate influence climatic features C. Rainforests open types show distinct values, with having a narrow range low values ( 29 alkane: ‰ ; Suess‐effect corrected). This allows detection even minor incursions savanna alkane ‰) into rainforests. While Cerrado savannas semi‐arid Caatinga grow under distinctly climates, they can yield indistinct most compounds. pronounced spreads between 33 alkanes, consistent across two homologs, thereby enabling these types. same multi‐homolog analysis be extended differentiate African savannas.

Language: Английский

Citations

2
Soil chemistry effect on GDGT abundances and their proxies in soils of the Okavango Delta DOI Creative Commons
Julie Lattaud, Mangaliso J. Gondwe, Marco Griepentrog

et al.

Organic Geochemistry, Journal Year: 2024, Volume and Issue: 195, P. 104847 - 104847

Published: July 31, 2024

Branched and isoprenoid glycerol dialkyl tetraethers (brGDGTs, isoGDGTs) are two families of membrane lipids commonly used to reconstruct paleo-environmental parameters. Their use as a quantitative proxy for past temperatures has been hindered by the discovery other environmental controls on their distribution in soils, such changes bacterial community composition, chemistry aridity. To test impact aridity-driven soil changes, GDGT concentrations derived proxies were measured 43 soils along chemical gradient Okavango Delta. All brGDGT increase with decreasing pH. Alkalinity-promoted (6-methyl cyclopentane-containing) brGDGTs show secondary concentration arid characterized high pH>8 cation exchange capacity (CEC>30 cmolc kg−1). The 5-methyl increases faster that 6-methyl compared non-arid soils. Although limited variability temperature is present (∼2 °C), significant variation MBT′5ME values observed (0.63–0.96) likely driven CEC. IsoGDGTs lower than brGDGTs, Ri/b values, potential paleohydrological reconstruction, correlating water content (r = 0.45, p < 0.01). TEX86 (0.57–0.97) correlate pH across aridity transect. In this region, where accurate paleostudies scarce, GDGT-proxies shown, i.e., overall controlled CEC, but correlates negatively IR6ME alkaline Furthermore, we propose GDGT-based exchangeable calcium, hydrological

Language: Английский

Citations

2
Peatland warming influences the abundance and distribution of branched tetraether lipids: Implications for temperature reconstruction DOI Creative Commons
Nicholas O. E. Ofiti, Arnaud Huguet, Paul J. Hanson

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 924, P. 171666 - 171666

Published: March 13, 2024

Branched glycerol dialkyl tetraethers (brGDGTs) are bacterial membrane lipids whose distribution in peatland soils serves as an important proxy for past climate changes due to strong linear correlations with temperature modern environments. However, commonly used brGDGT-based models characterized by high uncertainty (ca. 4 °C) and these calibrations can show implausible when applied at ecosystem level. This lack of accuracy is often attributed our limited understanding the exact mechanisms behind relationship between brGDGTs potential effect temperature-independent factors on brGDGT distribution. Here, we examine abundance a boreal after four years in-situ warming (+0, +2.25, +4.5, +6.75 +9 °C). We observed that warming, concentrations total increased. Furthermore, determined shift surface aerobic layers acrotelm (0–30 cm depth), whereas no detectable change was deeper anaerobic depths (>40 cm), possibly microbial activity. The response also reflected increase methylation index 5-methyl (MBT′5Me), classically proxy. Further, MBT′5Me soil differed 0 10, 10–20 20–30 depth, highlighting depth-specific which should be considered paleoenvironmental paleoecological studies. As community composition generally unaltered, rapid argue physiological adaptation microorganisms producing lipids. Finally, water table depth were better predictors concentration distribution, drivers impact proxies. To summarize, results provide insights source underscore viable proxies climatic perturbation peatlands.

Language: Английский

Citations

1
Discrepancies in lacustrine bacterial lipid temperature reconstructions explained by microbial ecology DOI Creative Commons
Jie Liang, Manuel Chevalier, Keshao Liu

et al.

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: Dec. 5, 2024

Abstract Bacterial lipid branched glycerol dialkyl tetraethers (brGDGTs) are a valuable tool for reconstructing past temperatures. However, gap remains regarding the influence of bacterial communities on brGDGT profiles. Here, we identified two distinct patterns brGDGTs from surface sediments 38 Tibetan Plateau lakes using an unsupervised clustering technique. Further investigation revealed that salinity and pH significantly change community composition, affecting profiles causing brGDGT-based temperatures to be overestimated by up 2.7 ± 0.7 °C in haloalkaline environments. We subsequently used trained model examine assemblages global lacustrine dataset, confirming applicability our approach. finally applied approach Holocene records Plateau, showing shifts clusters amplified temperature variations over timescales. Our findings demonstrate microbial ecology can robustly diagnose constrain site-specific discrepancies reconstruction.

Language: Английский

Citations

1
Afforestation induced shift in the microbial community explains enhanced decomposition of subsoil organic matter DOI Creative Commons
Tatjana Carina Speckert, Arnaud Huguet, Guido L. B. Wiesenberg

et al.

Published: April 4, 2024

Abstract. Afforestation on former pastures is widely promoted due to its potential increase soil organic carbon sequestration while reducing CO2 emission. The establishment of a forest pasture, however, might affect microbial community structure the alteration in substrate quality and thus impact cycling soils. To date, it still remains an open question if how afforestation may alter related implications for matter stabilization. In addition, majority studies focuses low altitude regions which results uncertainties regarding effects microbiology mountainous regions. this study, we aimed investigate consequences subalpine pasture with Norway spruce (Picea abies L.) following 130 years afforestation. We used multi-proxy biomarker approach, including phospholipid fatty acids (PLFAs) glycerol dialkyl tetraethers (GDGTs), explore shift increasing stand age. found significant bacterial communities (Gram- Gram+ bacteria) age compared pasture. This trend, was reversed when considering GDGT biomarkers. thereby conclude that forests different ages utilize substrates as food resource, direct consequence modification litter input after conversion forests. Our data further suggests decomposition from structure, especially evident subsoil 130-year-old ages.

Language: Английский

Citations

0
The global distribution of Isoprenoidal Glycerol Dialkyl Diethers (isoGDDs) is consistent with a predominant degradation origin DOI Creative Commons
Joe S. Hingley, César C. Martins, Chloe Walker-Trivett

et al.

Organic Geochemistry, Journal Year: 2024, Volume and Issue: 192, P. 104782 - 104782

Published: April 25, 2024

Glycerol dialkyl diethers (GDDs) are membrane lipids and a variation of the more commonly known glycerol tetraethers (GDGTs). GDGTs include both archaeal bacterial that frequently used for paleoclimate reconstruction in range terrestrial aquatic environments. In contrast to GDGTs, GDDs lack one terminal moieties. Although isoprenoidal (iso) branched (br) have been found, this study focuses on isoGDDs. These found few However, origin isoGDDs is debated extent their distribution across surface Earth poorly constrained. Based single site studies, previous authors hypothesised degradation products isoGDGTs, but recent studies isolated from cultured nitrososphaerota (formerly thaumarchaeota) proposed biological source through direct biosynthesis. Here we compiled global dataset isoGDD isoGDGT abundance environmental samples thoroughly investigate correlation with isoGDGTs scale variety environments (peat, mineral soils, lake sediments, marine sediments). We find present most analysed. Their strongly proportional (r2 = 0.85), dominated by GDGT-crenarchaeol/GDD-crenarchaeol ratio 0.94) supported individual compound isoGDGT/isoGDD ratios 0.56–0.94). addition, degree cyclisation isoGDDs, reflected ring index, positively correlated 0.84) all conclude abundant predominantly originate isoGDGTs.

Language: Английский

Citations

0