Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

21 hours 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

1 day 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

4 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

4 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

4 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

4 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

4 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

6 days 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...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

6 days ago

High nitrogen fixation and Braarudosphaera presence in the North Sea Nitrogen fixation, the microbial conversion of dinitrogen gas to ammonia, is a key nitrogen source and critical for sustaining marine productivity. We investigated the diversity and activity of nitro....

High nitrogen fixation and Braarudosphaera presence in the North Sea　Kendra Turk-Kubo, Claire Mahaffey, Jo Hopkins, Ruth Hawley, Louisa Norman, Lewis Wrightson, Ben Fisher, Stefanie Rynders, Clive Neil, Maryam Ilyas, Maeve C. Lohan　doi.org/10.1002/lno.... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Preparation and Calibration of 17O-Enriched Nitrite Isotope Standards The oxygen-17 isotope anomaly (Δ17O) serves as a powerful tool to elucidate the chemical transformation mechanisms of atmospheric reactive nitrogen species such as NO2 and HONO. Current studies employ...

Preparation and Calibration of 17 O-Enriched Nitrite Isotope Standards, doi.org/10.1021/acsearthspacechem.5c00399, #stableisotopes, ACS Earth and Space Chemistry

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Trace metal and carbon isotope composition of amorphous calcium carbonate-derived CaCO3 minerals as a function of temperature and time, doi.org/10.1016/j.chemgeo.2026.123303, #stableisotopes, Chemical Geology

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Global ocean heat content over the past 3 million years - Nature Estimates of mean ocean temperature based on noble gas (Xe/Kr) measurements in shallow ice cores from the Allan Hills blue ice area, Antarctica, indicate enhanced cooling around the Plio-Pleistoc...

Global ocean heat content over the past 3 million years, doi.org/10.1038/s41586-026-10116-3, #stableisotopes, Nature

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

A model study of sulfur mass-independent fractionation formation produced in a chamber photochemical experiment under reducing conditions, doi.org/10.1016/j.epsl.2026.119965, #stableisotopes, Earth and Planetary Science Letters

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Precise kinetic parameters for thermal resetting of clumped isotope signatures in biogenic and abiogenic calcites, doi.org/10.1016/j.epsl.2026.119955, #stableisotopes, Earth and Planetary Science Letters

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Molecular-isotope perspectives on the fates of millennial-aged terrestrial organic carbon in a river-dominated estuary-marginal sea system, doi.org/10.1016/j.epsl.2026.119956, #stableisotopes, Earth and Planetary Science Letters

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Broadly stable atmospheric CO2 and CH4 levels over the past 3 million years - Nature Blue ice records from Antarctica are used to determine methane and carbon dioxide concentrations over the past 3 million years.

Marks-Peterson, J., Shackleton, S., Higgins, J. et al. Broadly stable atmospheric CO2 and CH4 levels over the past 3 million years. #stableisotopes Nature 651, 647–652 (2026). doi.org/10.1038/s415...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Soil Management Effects on Grapevine Water Uptake Depth in a Mediterranean Vineyard Stable isotope evidence of vine water uptake depth under spontaneous cover crop and tillage.

Soil Management Effects on Grapevine Water Uptake Depth in a Mediterranean Vineyard - Ruiz - 2026 - European Journal of Soil Science - Wiley Online Library bsssjournals.onlinelibrary.wiley.com/doi/full/10.... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Microbially enhanced dissolution of calcite in sinking marine particles | PNAS Evidence for the shallow cycling of calcium carbonate in the global ocean is mounting, but the mechanisms driving the dissolution of thermodynamica...

Microbially enhanced dissolution of calcite in sinking marine particles | PNAS www.pnas.org/doi/10.1073/... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

The distribution and isotopomeric characterization of nitrous oxide in the Eastern Gotland Basin (central Baltic Sea) Abstract. Nitrous oxide (N2O) is a greenhouse gas with a global warming potential ∼ 300 times that of carbon dioxide. Coastal areas are important sources of N2O to the atmosphere but the biogeochemica...

Bardhan, P., Frey, C., Rehder, G., and Bange, H. W.: The distribution and isotopomeric characterization of nitrous oxide in the Eastern Gotland Basin (central Baltic Sea), Biogeosciences, 23, 1987–2002, doi.org/10.5194/bg-2..., 2026. #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Zhu, D., Zhang, W., Balcazar, J.L. et al. The hidden role of rhizospheric viruses in promoting nitrogen fixation in soils. #stableisotopes Nat Commun (2026). doi.org/10.1038/s414...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Kashyap, S., Caro, T.A. & Templeton, A.S. Microbial growth rates captured using Raman-SIP reveal a highly active subsurface biosphere fueled by serpentinization. Nat Commun (2026). doi.org/10.1038/s414... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Quantifying the Trophic Transfer Process and Dietary Source of Legacy and Emerging Per- and Polyfluoroalkyl Substances in the Food Web in Bohai Sea Sea is one of the global final reservoirs of per- and polyfluoroalkyl substances (PFAS), a group of anthropogenic syntheic chemicals of global concern. However, knowledge regarding trophic transfer and biomagnification of PFAS along the marine food web remains poorly understood. Here, to address this gap, a tropical marine food web including 60 species were collected from the Bohai Sea for an analysis of 39 representative PFAS. We found that the emerging PFAS dominated the total PFAS compositions (51.77%), majorly attributed to the significant impacts from the replacement of long-chain legacy PFAS with novel alternatives. Many long-chain legacy PFAS showed trophic magnification factors larger than 1.0, which suggests their considerable biomagnification potential in this food web. A Bayesian MixSIAR model further revealed that conch, shrimp, and crab jointly account for 78.1% and 91.2% of diet proportions for cephalopod and pelagic fish, respectively. The Monte-Carlo-model-simulated maximum perfluorooctanoic acid (PFOA)-equivalent hazard indexes induced by fish consumption were 0.61–0.82 and 1.01–1.33 for adult and children, respectively, and showed an increasing pattern with the rising tropical level. Our findings demonstrate the prevalence of PFAS in the Bohai Sea and highlight the crucial role of diet sources in PFAS bioaccumulation in marine food webs.

Quantifying the Trophic Transfer Process and Dietary Source of Legacy and Emerging Per- and Polyfluoroalkyl Substances in the Food Web in Bohai Sea | Environmental Science & Technology pubs.acs.org/doi/10.1021/... #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Nitrogen input drives carbon flow in desert ecosystems: mechanisms of photosynthetic carbon allocation response to nitrogen deposition - Oecologia Against the backdrop of continuously increasing global nitrogen (N) deposition, the changes in photosynthetic carbon (C) allocation patterns of desert plants and their underlying mechanisms affecting ...

Yang, J., Guo, X., Zhang, L. et al. Nitrogen input drives carbon flow in desert ecosystems: mechanisms of photosynthetic carbon allocation response to nitrogen deposition. #stableisotopes Oecologia 208, 25 (2026). doi.org/10.1007/s004...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Repeated migration informs amino acid nitrogen isotope incorporation in the African elephant Loxodonta africana - Oecologia Accurate interpretation of an organism’s isotopic composition relies heavily on the assumption of steady state, which is often violated owing to limited appreciation for isotope incorporation. We pres...

Shipley, O.N., Cerling, T.E., Wittemyer, G. et al. Repeated migration informs amino acid nitrogen isotope incorporation in the African elephant Loxodonta africana. #stableisotopes Oecologia 208, 27 (2026). doi.org/10.1007/s004...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Frontiers | Niche adaptation of particle-associated ammonia-oxidizing archaea sustains nitrification under marine deoxygenation Marine deoxygenation is restructuring coastal microbial niches and metabolic networks, with cascading effects on biogeochemical cycles, a key component of wh...

Niche adaptation of particle-associated ammonia-oxidizing archaea sustains nitrification under marine deoxygenation. Front. Microbiol. #stableisotopes www.frontiersin.org/journals/mic...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Cerium isotope evidence for rapid redox shifts in shallow marine environments across the end-Permian mass extinction, doi.org/10.1130/g54293.1, #stableisotopes

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Multiple sulfur isotope constraints on sulfur cycling in monomictic Lake Kinneret Sulfur cycling in the water column of Lake Kinneret with emphasis on the triple sulfur isotope (δ32S, δ33S, δ34S) fractionation between sulfate and hydrogen sulfide was investigated. In addition to...

Multiple sulfur isotope constraints on sulfur cycling in monomictic Lake Kinneret: Inland Waters: Vol 0 , No ja - Get Access www.tandfonline.com/doi/full/10.... #stableisotopes

@marinefreshwater.bsky.social

1 week ago

By analysing #stableisotopes, Fontaine et al. showed these species occupy high trophic positions but differ in resource use, migration and habitat exploitation.

Despite overlap in isotope niche space, subtle differences in foraging likely shape how these predators structure pelagic ecosystems.

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Tang, S., Qiao, Y., Xia, J. et al. Joint control of precipitation and CO2 on global long-term patterns of plant nitrogen availability. #stableisotopes Nat Commun (2026). doi.org/10.1038/s414...

Stable Isotope Ecology (CER, Kyoto Univ.)

@stableisotopeecol.bsky.social

1 week ago

Predation threat affects isotope ratios of planktonic consumers - Oecologia The analysis of stable isotopes of carbon and nitrogen is widely used in ecological investigations. However, sources of variation in isotope ratios of animals are far from being identified, which may ...

Brzeziński, T., Bojanowski, M. & Radzikowska, M. Predation threat affects isotope ratios of planktonic consumers. Oecologia 208, 9 (2026). doi.org/10.1007/s004... #stableisotopes