Stable Isotope Ecology (CER, Kyoto Univ.)

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Subsurface leaf and root litter enhance soil carbon formation compared to surface litter: Direct evidence from a 13C‐labelled incubation experiment - Zhang - 2026 - Functional Ecology #stableisotopes besjournals.onlinelibrary.wiley.com/doi/full/10....
  

  Subsurface leaf and root litter enhance soil carbon formation compared to surface litter: Direct evidence from a 13C‐labelled incubation experiment

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Plant–plant nitrogen transfer is prevalent in a semi‐arid shrubland and affects the foliar N content of recipient plants - González‐Díaz - 2026 - Functional Ecology #stableisotopes besjournals.onlinelibrary.wiley.com/doi/full/10....
  

  Plant–plant nitrogen transfer is prevalent in a semi‐arid shrubland and affects the foliar N content of recipient plants

  Read the free Plain Language Summary for this article on the Journal blog.

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Inferring bird migration from bone isotopes and histology: A fossil‐friendly methodological framework - Duhamel - 2026 - Methods in Ecology and Evolution #stableisotopes besjournals.onlinelibrary.wiley.com/doi/full/10....
  

  Inferring bird migration from bone isotopes and histology: A fossil‐friendly methodological framework

  Bird seasonal migration is a remarkable biogeographic phenomenon, yet its deep-time origin(s) and evolutionary history remain poorly understood, with the bird fossil record largely overlooked. Thi...

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Plant diversity changes the trophic position of Collembola in temperate grassland #stableisotopes www.sciencedirect.com/science/arti...
  

  Plant diversity changes the trophic position of Collembola in temperate grassland

  Biodiversity loss threatens ecosystem functions, including decomposition and nutrient cycling. We investigated whether Collembola (springtails), key s…

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Exploring the Dietary Preferences of Limnic Supraglacial Consumers: 13C and 15N Isotopic Food Labelling in Tardigrades and Rotifers From Cryoconite Holes #stableisotopes onlinelibrary.wiley.com/doi/full/10....
  

  Exploring the Dietary Preferences of Limnic Supraglacial Consumers: 13C and 15N Isotopic Food Labelling in Tardigrades and Rotifers From Cryoconite Holes

  Cryoconite holes are among the most biologically active and diverse limnic habitats on glacier surfaces. The apex cryoconite consumers, tardigrades and rotifers, are known to contribute significan...

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Deciphering Sulfur-Based Denitrification in Confined Alluvial-Lacustrine Aquifers through Multi-isotope (15N, 34S, 13C, and 18O) and Metagenomic Analyses | Environmental Science & Technology pubs.acs.org/doi/10.1021/... #stableisotopes
  

  Deciphering Sulfur-Based Denitrification in Confined Alluvial-Lacustrine Aquifers through Multi-isotope (15N, 34S, 13C, and 18O) and Metagenomic Analyses

  Sulfur-based denitrification offers unique advantages in nitrogen removal in low-carbon environments. Despite its importance, the prevalence, controlling factors, and microbial mediators of sulfur-based denitrification in aquifers remain largely unknown. By integrating multiple stable isotopes and genome-resolved metagenomics, we investigated the coupling of nitrogen and sulfur cycling along the groundwater flowpath from unconfined to confined alluvial-lacustrine aquifers in the Poyang Lake Plain, China. Isotope (i.e., δ15N–NO3–, δ18O–NO3–, δ34S–SO42–, δ18O–SO42–, δ18O–H2O, δ13C-DIC, and δ13C-DOC) fractionation and hydrogeochemical trends indicated a transition from nitrification-dominated processes in the unconfined aquifer to denitrification, sulfide oxidation, and sulfate reduction in the confined aquifer. A significant negative correlation between δ34S–SO42– and δ15N–NO3–, along with a significant positive correlation between genes involved in sulfide oxidation and nitrate reduction, suggested cryptic coupling between sulfide oxidation and nitrate reduction. Sulfur-autotrophic denitrifying metagenome assembly genomes encoding Calvin–Benson–Bassham carbon fixation and rTCA pathways, such as Burkholderiales, Rhodocyclaceae, and Sulfurimonas, were enriched in the confined aquifer and co-occurred with sulfate reducers (Pseudomonadota and Desulfobacterota). These results highlighted sulfur cycling consortia when sulfate was reduced to facilitate removal of nitrate via sulfur-based denitrification. These findings reveal the role of cryptic sulfur cycling in sustaining denitrification in aquifers, offering new insights into nitrogen–sulfur interactions in subsurface ecosystems.

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Nitrogen Fixation Associated with Microcystis Colonies Promotes Harmful Cyanobacterial Blooms across North American Lakes | Environmental Science & Technology pubs.acs.org/doi/10.1021/... #stableisotopes
  

  Nitrogen Fixation Associated with Microcystis Colonies Promotes Harmful Cyanobacterial Blooms across North American Lakes

  Microcystis forms harmful cyanobacterial algal blooms around the world, including regions with low inorganic nitrogen (N) concentrations. Here, we measured the N2 fixation rates of isolated Microcystis colonies, free-living plankton, and the whole plankton community during dense Microcystis blooms over a three year period in six diverse lakes across eastern North America including Lake Erie. For five of six lakes, rates within the colony fraction were greater than the rates measured for free-living plankton (p < 0.05). N2 fixation rates were inversely correlated with the rates of ammonium uptake by the colony fraction (p < 0.05), and in experiments, ammonium significantly reduced N2 fixation rates within the colony fraction by 50–85% (p < 0.001). In several lakes, the δ15N of isolated colonies was lower (p < 0.05) than that of free-living plankton presumably due to the preferential use of 14N2 by diazotrophic, colony-associated plankton. Cyanobacterial and noncyanobacterial nifH sequences were associated with the Microcystis colonies with the nifH-based diversity of both groups being lower in colonies compared to free-living plankton. Compared to nitrate, ammonium, and urea uptake, N2 fixation rates accounted for 1–76% of total N assimilation by the Microcystis colony fraction and averaged 18% across systems, suggesting this process could support the proliferation of Microcystis blooms.

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Ammonium and N₂O production pathways in quaternary hill–plain groundwater: Evidence from multi-isotope and isotopomer analysis #stableisotopes www.sciencedirect.com/science/arti...
  

  Ammonium and N₂O production pathways in quaternary hill–plain groundwater: Evidence from multi-isotope and isotopomer analysis

  Ammonium (NH₄⁺) and nitrous oxide (N₂O) are key reactive nitrogen species in aquatic systems, with implications for water quality and greenhouse gas e…

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Applications of stable isotopes in lipid metabolic tracing and lipidomics analysis #stableisotopes www.sciencedirect.com/science/arti...
  

  Applications of stable isotopes in lipid metabolic tracing and lipidomics analysis

  Lipids are structurally diverse and functionally critical biomolecules playing key roles in energy storage, signal transduction, and membrane formatio…

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  Stable Isotope Ecology (CER, Kyoto Univ.) stableisotopeecol.bsky.social · Feb 4
  Orbital Variability in Grazing Proportion: New Insights From Sedimentary Amino Acid δ15N Records of the Western Equatorial Pacific - Li - 2026 - AGU Advances #stableisotopes agupubs.onlinelibrary.wiley.com/doi/full/10....
  

  Orbital Variability in Grazing Proportion: New Insights From Sedimentary Amino Acid δ15N Records of the Western Equatorial Pacific

  Well-preserved amino acid δ15N tracks isotopic changes in upper ocean nutrient and the trophic structure of the western equatorial Pacific The grazing proportion exhibits distinct precessional va...

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