Rationale The Japanese sea lion (Zalophus japonicus), once abundant in Japan, Korea, and Russia, went extinct by the mid-20th century due to hunting and environmental change. This study examines the.....

Rationale The isotopic composition of foods is useful for verifying origin and provides baseline information for interpreting isotopic data from human tissues in dietary and forensic research. Despi...

Rationale The stable carbon isotopic composition (δ13C) of individual lipids is of great value in studying carbon cycling. Among those, microbial lipids in sediments impacted by high methane turnove.....

Accurate source tracking of dissolved organic matter (DOM) in anthropogenically disturbed watersheds is crucial for pollution control. This study took…

Bioconversion is a sustainable method to recycle nutrient-rich aquaculture waste. This study explored waste bioconversion in the context of species co…

The response of fluvial nitrate (NO3–) export to climate warming remains poorly constrained in high-elevation basins. Here, we integrate multi-decadal NO3– flux records with multi-year measurements of...

The Neotropical catfish family Trichomycteridae contains parasitic fishes that include scale and mucus feeders (subfamily Stegophilinae) and blood feeders (i.e., ‘candirus’, subfamily Vandelliinae). ...

Isotopic analysis as a method of assessing diet or geographical origin is now ubiquitous in archaeology, to the point where seemingly no project is co…

Scientific Reports - Trophic dynamics and metabolic pathways in host parasite interactions revealed by nitrogen isotope analysis of amino acids in multiple tissues

Use of nitrogen and oxygen isotopic signatures of nitrate to investigate atmospheric nitrogen fixation by volcanic lightning Evidence for atmospheric nitrate enrichment in volcanic deposits relat...

Substantial quantities of nitrogen (N) and phosphorus (P) released by human activities, enter terrestrial ecosystems, thereby affecting the carbon cyc…

Frequent wildfires worldwide have severely disturbed soil organic carbon (SOC) pools, yet their effects on organic carbon turnover are still under deb…

Arbuscular mycorrhizal (AM) fungi are an important part of the soil microbial community. While their effects on soil properties and nutrient cycles ar…

Abstract. The sulfur cycle is very important in lake sediments, despite the much lower sulfate concentrations in freshwater than seawater. To date, little is known about the formation and preservation...

Topsoil nitrogen stocks declined over a ten-year field warming experiment in a permafrost ecosystem due to enhanced plant nitrogen uptake, nitrogen leaching and gaseous losses, suggesting that permafrost soil nitrogen stocks are vulnerable to warming.

Sulfur isotope excursions in skeletal collagen samples from Eurasia suggest rapidly changing biogeochemical processes across the region from about 30,000 to 15,000 years ago, potentially related to changing permafrost conditions.

An analysis of behavioural, eco-morphological and genomic data in 60 species of Lake Tanganyika cichlids reveals a remarkable diversity of temporal activity patterns across species, suggesting that temporal niche partitioning may have played a role in the adaptive diversification of this group.

Background and aims Belowground carbon (C), nitrogen (N) and phosphorus (P) inputs by plants via roots and rhizodeposition are key drivers of these elements cycling in soils. Tracing and quantification of rhizodeposition using isotope enrichment techniques is based on assumptions that have not simultaneously been tested for C, N and P. Our objectives were: (i) to compare the elemental and isotopic composition (IC) of roots and soluble rhizodeposits for C, N and P; and (ii) to compare the IC of root segments of different ages to assess the homogeneity of root system labeling. Methods The legume Canavalia brasiliensis was grown in sand and labeled with 13C, 15N and 33P by using a novel tri-isotope method in two different experiments lasting two (percolate collection) and three weeks (root observation) after labeling. Results Soluble rhizodeposits were less isotope enriched than roots at each time point, and each element showed a different course over time. The 13C:15N and 13C:33P ratios of rhizodeposits were higher shortly after labeling than at later samplings, highlighting faster transfer of 13C than 15N and 33P into rhizodeposits. Phosphorus fertilizer increased the difference between IC of P in roots and rhizodeposits. Youngest root segments were more isotopically enriched than older segments, again with element specific time course, showing that root segments of different ages differ in IC. Conclusion Assumptions underlying the quantification of rhizodeposition are not met. Temporal and spatial differences in IC of roots and soluble rhizodeposits are element specific, which needs to be considered in stoichiometric studies.

Abstract. To elucidate the origin and seasonality of atmospheric aerosols in forest areas, simultaneous PM2.5 collection was carried out in two typical forest sites: Changbai Mountain (CB, 42.40° N, 1...

Experiments and modelling unravel mechanisms of nitrous oxide production from nitrate, the primary nitrous oxide production pathway in oxygen minimum zones. Results highlight the critical role of microbial interactions in regulating this pathway.

To our knowledge, this study represents the first application of 13C-metabolic flux analysis to a human fungal pathogen, where we identified carbon reservoirs and quantified the metabolic fluxes of pa...

These results confirm that, under soil acidification, less photosynthetic C in roots was converted into rhizodeposit C entering the soil, while proportionally more was invested in root growth, respir....

Vascular epiphytes exhibit a minimal but noteworthy leaf–root 15N fractionation compared with soil-rooted plants, reflecting the more severe N stress in the canopy habitats. The leaf–root 15N fractio...

Rationale Stable isotopes can be useful for tracking diet composition and other physiological processes in ruminants. These techniques rely on the fact that tissues directly reflect the animal's die...