Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Recent progress in the application of organic isotopes in environmental geochemistry of the Anthropocene Naturally occurring stable and radioactive isotopes in organic compounds are extensively utilized in terrestrial, atmospheric, and aquatic environment…

Recent progress in the application of organic isotopes in environmental geochemistry of the Anthropocene #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Dino Diets Revealed by Isotopes What did dinosaurs such as ‘Spinosaurus’ eat? Analytical techniques settle some decades-long debates.

Dino Diets Revealed by Isotopes | ACS Central Science pubs.acs.org/doi/10.1021/... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

A mineralisation-based method for estimating soil microbial carbon use efficiency Microbial carbon use efficiency (CUE) reflects how microorganisms allocate carbon between mineralisation and biosynthesis, with consequences for soil …

A mineralisation-based method for estimating soil microbial carbon use efficiency #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Mixotrophy emerges as an optimal strategy in mature waters of the Amazon River plume - Communications Biology There is a transition between four distinct microalgae communities through a mosaic of habitats with different physicochemical conditions associated with the aging of the Amazon River plume, progressi...

Fernández-Carrera, A., Choisnard, N., Wodarg, D. et al. Mixotrophy emerges as an optimal strategy in mature waters of the Amazon River plume. #stableisotopes Commun Biol 9, 434 (2026). doi.org/10.1038/s420...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Drought‐driven lipid deficits in overwintering monarch butterflies revealed by δ2H and fatty acid analysis Eastern populations of monarch butterflies (Danaus plexippus) overwinter in the central trans-volcanic belt of Mexico, relying primarily on lipids accumulated during migration to sustain this several....

Drought‐driven lipid deficits in overwintering monarch butterflies revealed by δ2H and fatty acid analysis - Anparasan - 2026 - Ecosphere #stableisotopes esajournals.onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Frontiers | Microbial efficiency enhancement drives carbon sequestration in long-term organic farming systems: linking taxonomic succession to carbon use efficiency Organic farming enhances soil carbon sequestration, which is a critical strategy for climate change mitigation and sustainable agriculture. However, the micr...

Microbial efficiency enhancement drives carbon sequestration in long-term organic farming systems: linking taxonomic succession to carbon use efficiency, doi.org/10.3389/fmicb.2026.1770908, #stableisotopes, Frontiers in Microbiology

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Frontiers | Assimilatory N2O reduction by Nostoc sp. strain MS1 isolated from a river: insights from genome and 15N tracer analysis Direct evidence for the assimilation of nitrous oxide (N₂O), a potent greenhouse gas, by freshwater cyanobacteria has been lacking. Here, we report a cyanoba...

Assimilatory N2O reduction by Nostoc sp. strain MS1 isolated from a river: insights from genome and 15N tracer analysis. www.frontiersin.org/journals/mic... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Biocrusts enhance nitrogen fixation and mineralization, increasing soil nitrogen availability and uptake by dryland shrubs Biocrusts are key components of dryland ecosystems that strongly influence soil nitrogen (N) cycling. In semiarid regions, they often coexist with xer…

Biocrusts enhance nitrogen fixation and mineralization, increasing soil nitrogen availability and uptake by dryland shrubs #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Application of Isotopic Method to Identify the Sources of Nitrate in Freshwater: Principles, Biases, and Optimizations This review systematically examines the principles and systematic errors of isotope-Bayesian model coupling for nitrate source tracing in aquatic environments, proposes advanced optimization strategi....

Application of Isotopic Method to Identify the Sources of Nitrate in Freshwater: Principles, Biases, and Optimizations - Liu - 2026 - Water Environment Research #stableisotopes onlinelibrary.wiley.com/doi/abs/10.1...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Isotopic Signature of Organic Nitrogen in Authigenic Carbonates: Implications for Dynamic Nitrogen Cycling at Submarine Cold Seeps Organic nitrogen (ON) in seep carbonates records low δ15NON values at both methane and brine seeps δ15NON is largely decoupled from δ13CTOC of organic carbon, indicating variable nitrogen sources...

Isotopic Signature of Organic Nitrogen in Authigenic Carbonates: Implications for Dynamic Nitrogen Cycling at Submarine Cold Seeps - Zhang - 2026 - Journal of Geophysical Research: Oceans #stableisotopes agupubs.onlinelibrary.wiley.com/doi/abs/10.1...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Porewater‐Surface Water Interface Mediates Methanogenesis, Oxidation, and Large Methane Emissions in Mixed Seagrass‐Macroalgae Ecosystems Tidal pumping and seasonal bioturbation jointly regulate CH4 fluxes from porewater exchange Methylotrophic pathway dominates CH4 production, with negligible anaerobic oxidation of CH4 Macroalgae...

Porewater‐Surface Water Interface Mediates Methanogenesis, Oxidation, and Large Methane Emissions in Mixed Seagrass‐Macroalgae Ecosystems - Dai - 2026 - Journal of Geophysical Research: Oceans #stableisotopes agupubs.onlinelibrary.wiley.com/doi/abs/10.1...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Constraining Greenhouse Gas Cycling and Emissions in Africa's Largest Humic Lake Lake Mai Ndombe is supersaturated in CO2 ${\text{CO}}_{2}$, CH4 ${\text{CH}}_{4}$, and N2O ${\mathrm{N}}_{2}\mathrm{O}$, with outgassing fluxes of 375 ± 32 Gg C yr−1, 623 ± 136 Mg C yr−1, and 223 ...

Constraining Greenhouse Gas Cycling and Emissions in Africa's Largest Humic Lake - Barthel - 2026 - Journal of Geophysical Research: Biogeosciences #stableisotopes agupubs.onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Acidification Stimulates N2O Production by Oceanic Nitrifying Bacteria Nitrosococcus oceani, one of the nitrifying bacteria in coastal regions and estuaries, produces more N2O when pH is decreased Under O2 saturated conditions, the increased N2O production is caused...

Acidification Stimulates N2O Production by Oceanic Nitrifying Bacteria - Toyoda - 2026 - Journal of Geophysical Research: Biogeosciences #stableisotopes agupubs.onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Effects of Meltwater on the Arctic Coastal Microbial Food Web: An Experiment With Isotopic Labeling From Young Sound, NE Greenland We test how sediment-rich river-runoff carrying glacial meltwater affects the microbial food-web in a Greenlandic fjord Meltwater enriches the marine environment with silicon, and low amounts of ...

Effects of Meltwater on the Arctic Coastal Microbial Food Web: An Experiment With Isotopic Labeling From Young Sound, NE Greenland - Puts - 2026 - Journal of Geophysical Research: Biogeosciences #stableisotopes agupubs.onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Vertical hydrological processes act as the primary driver of organic matter dynamics in frontal zones Previous studies of organic matter (OM) dynamics in frontal zones have emphasized biological and chemical controls, whereas the role of vertical physical processes remains insufficiently understood. ...

Vertical hydrological processes act as the primary driver of organic matter dynamics in frontal zones - Liu - 2026 - Limnology and Oceanography #stableisotopes aslopubs.onlinelibrary.wiley.com/doi/abs/10.1...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Nutrient and light availability control food webs and fish larvae in the Peruvian upwelling system Upwelling ecosystems sustain some of the world's most productive fisheries by supplying deep-water nutrients to the sunlit ocean surface. Yet, how spatiotemporal variability in nutrient-upwelling and....

Nutrient and light availability control food webs and fish larvae in the Peruvian upwelling system - Goldenberg - 2026 - Limnology and Oceanography #stableisotopes aslopubs.onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Fecal pellet packaging enhances marine carbon sequestration Fecal pellets produced by marine zooplankton contribute substantially to transporting biologically fixed carbon from the sunlit sea surface into deeper water layers. Their occurrence and composition ...

Fecal pellet packaging enhances marine carbon sequestration - Karthäuser - 2026 - Limnology and Oceanography #stableisotopes aslopubs.onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Microbial activity preserved in 3.4 Ga colloform pyrite: A micro–scale sulfur isotope analyses Microfossil-bearing black cherts from the ca. 3.4 Ga Strelley Pool Formation in the Goldsworthy Greenstone Belt, Pilbara Craton, offer critical insigh…

Microbial activity preserved in 3.4 Ga colloform pyrite: A micro–scale sulfur isotope analyses #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

A New Theoretical Framework for Parameterizing Nonequilibrium Fractionation During Evaporation From the Ocean A new parameterization is developed for nonequilibrium fractionation of water isotopes during evaporation from the ocean The new parameterization predicts a decrease in nonequilibrium fractionati...

A New Theoretical Framework for Parameterizing Nonequilibrium Fractionation During Evaporation From the Ocean - Dütsch - 2026 - Journal of Advances in Modeling Earth Systems #stableisotopes agupubs.onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Methane‐Derived Carbon Contributes to Fish Biomass in a Deep, Eutrophic Reservoir Methanotrophic bacteria oxidise large amounts of biogenic methane produced in freshwater and bind the original methane carbon in their biomass. When these bacteria are consumed by other organisms,...

Methane-Derived Carbon Contributes to Fish Biomass in a Deep, Eutrophic Reservoir #stableisotopes onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

Redistribution of anthropogenic nitrate via artificial snowmaking to mountain aquifers: Isotopic evidence and biogeochemical pathways Artificial snow production is widely used as an adaptation strategy for winter tourism under climate warming, yet its influence on nitrogen (N) redist…

Redistribution of anthropogenic nitrate via artificial snowmaking to mountain aquifers: Isotopic evidence and biogeochemical pathways #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 day ago

An integrated geochemical and isotopic framework for nitrate source apportionment in a shallow coastal aquifer under multiple environmental pressures Nitrate pollution in coastal aquifers poses growing environmental concerns, yet aquifer responses to coupled natural and anthropogenic drivers remain …

An integrated geochemical and isotopic framework for nitrate source apportionment in a shallow coastal aquifer under multiple environmental pressures #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

3 days ago

Mycorrhizal Type Defines Priming Effects in Organic and Mineral Forest Soils As forest composition changes globally, understanding how shifts in mycorrhizal dominance affect soil carbon cycling becomes increasingly important. We found that the dominance of trees associating w....

Mycorrhizal Type Defines Priming Effects in Organic and Mineral Forest Soils, GCB, #stableisotopes onlinelibrary.wiley.com/doi/abs/10.1...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

3 days ago

Drought Reduces Formation, but Enhances Persistence, of Mineral‐Associated Organic Matter in a Grassland Soil We used a 13C-CO2 labeling study to track the formation and persistence of mineral-associated soil carbon derived from living root and decaying root inputs under normal moisture and droughted conditi...

Drought Reduces Formation, but Enhances Persistence, of Mineral-Associated Organic Matter in a Grassland Soil、Global Change Biology, #stableisotopes onlinelibrary.wiley.com/doi/full/10....

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

6 days ago

Position-Specific Carbon Isotope Fingerprinting of Fluorinated Organics and Degradation Products Fluorinated organic compounds are of growing environmental and forensic relevance due to their widespread use in pharmaceuticals, agrochemicals, and consumer products, their environmental persistence, and potential ecological and human health impacts. Elucidating their sources and transformation pathways is therefore a major focus of current research. Stable carbon isotope analysis provides a powerful approach for tracing molecular origins and linking parent compounds to degradation products. Recent isotope measurements have largely relied on mass-spectrometry techniques, which provide only an average isotope ratio across a compound. Here, we employ a novel nuclear magnetic resonance (NMR) spectroscopy tool to determine position-specific carbon isotope ratios (13C/12C) in organofluorine compounds and their degradation products. This approach enables isotope measurements without combustion or extensive purification and, crucially, resolves ratios at individual carbon positions rather than bulk averages. The resulting intramolecular isotope fingerprints are unique to a molecule’s source. Applied to selected pharmaceuticals and pesticides, these fingerprints allow discrimination of chemically identical compounds. Moreover, we show that the 13C/12C signature at the fluorinated carbon persists through degradation, demonstrated for lansoprazole and fipronil. The 19F NMR data produced for the 13C/12C analyses are also well suited for impurity profiling, providing an additional dimension for fingerprinting fluorinated organics. These findings suggest that position-specific isotope analysis can serve as part of a broader suite of tools for source characterization of organofluorine compounds and their breakdown derivatives, with potential applications in product validation, forensics, and linking these compounds to their breakdown products.

Position-Specific Carbon Isotope Fingerprinting of Fluorinated Organics and Degradation Products | Analytical Chemistry pubs.acs.org/doi/10.1021/... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

6 days ago

A Unified Method for Triple Oxygen Isotope Analysis of Sulfate, Water, and Organics Triple oxygen isotope analyses of sulfate, water, and organic materials provide vital insights into geochemical processes. Here, we present the fully automated TORCH method (Triple Oxygen isotope anal...

A Unified Method for Triple Oxygen Isotope Analysis of Sulfate, Water, and Organics | Analytical Chemistry pubs.acs.org/doi/10.1021/... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

6 days ago

Advancing the understanding of the trophic ecology of Scyliorhinus canicula in the Mediterranean Sea: Insights from a Tyrrhenian case study and a review of current knowledge Sharks are cartilaginous fishes that serve as both meso- and top predators in marine ecosystems. Globally, they are targeted by commercial and recreat…

Advancing the understanding of the trophic ecology of Scyliorhinus canicula in the Mediterranean Sea: Insights from a Tyrrhenian case study and a review of current knowledge #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

6 days ago

The isotopic niche breadth of aquatic insects increases with elevation in neotropical mountain streams Understanding the ecological dynamics of upland streams along elevational gradients is crucial for conservation and management, particularly for criti…

The isotopic niche breadth of aquatic insects increases with elevation in neotropical mountain streams #stableisotopes www.sciencedirect.com/science/arti...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

6 days ago

Grazing intensity shifts plant–microbe competition for ammonium and nitrate in temperate grasslands - Iqbal - 2026 - Journal of Ecology #stableisotopes besjournals.onlinelibrary.wiley.com/doi/abs/10.1...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Interactive drivers of root decomposition in restored and natural mangroves Root decomposition in mangroves is controlled by interactive local factors rather than global factors, highlighting the need for site-specific management strategies. Our results underscore the import...

Interactive drivers of root decomposition in restored and natural mangroves - Ouyang - 2026 - Journal of Applied Ecology #stableisotopes besjournals.onlinelibrary.wiley.com/doi/abs/10.1...