地球科学最新文献

{"title":"Future Decline of Ice-Algal Primary Productivity in the Arctic Ocean: Model Intercomparison","authors":"Yuanxin Zhang,&nbsp;Eiji Watanabe,&nbsp;Hakase Hayashida,&nbsp;Tessa Sou,&nbsp;Nadja Steiner","doi":"10.1029/2026JC024067","DOIUrl":"https://doi.org/10.1029/2026JC024067","url":null,"abstract":"<p>A potential future evolution of ice-algal primary productivity (ice-PP) in the Arctic Ocean is investigated through an intercomparison of three sea ice-ocean coupled models: JAM (Japan), IOS (Canada), and UTAS (Australia). Ice-PP and related environmental variables are analyzed for three time periods: 1979–2018 (Phase 1), 2021–2060 (Phase 2), and 2061–2100 (Phase 3), assuming the high greenhouse-gas emission scenario (SSP5-8.5). All three models show pronounced regional contrasts, with higher ice-PP in shelf regions such as the Chukchi and Laptev Seas, and lower ice-PP in the central Arctic and Atlantic gateway. The JAM and UTAS models simulate ice-PP decline across regions due to reductions in sea ice and nutrients that overwhelm the enhanced light condition until Phase 2 (Phase 3) in the JAM (UTAS) model. The IOS model also simulates ice-PP decline in Atlantic-side regions, while projecting a temporary ice-PP increase in Phase 2 in Pacific–central Arctic regions, where improved light conditions temporarily dominate the impact over sea ice loss and nutrient reduction. Sensitivity experiments using the JAM model show that changing the light parameterization can reproduce ice-PP increase in Phase 2, while other changes related to ice-algal growth rate do not alter the ice-PP inter-phase pattern (decline during Phase 1–3). Results show that both decreasing nutrient availability and shrinking sea ice drive a potential future Arctic ice-PP decline, but the choices of ice-algal formulation and parameter values, especially for light conditions, produce various inter-model spreads. Observational data and laboratory experiments are needed to better parameterize ice-algal processes and constrain future projections.</p>","PeriodicalId":54340,"journal":{"name":"Journal of Geophysical Research-Oceans","volume":"131 10","pages":""},"PeriodicalIF":3.3,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JC024067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149259198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Global rainfall erosivity: A comprehensive review and appropriate applications of empirical erosivity models","authors":"Renjie Zong, Nufang Fang, Yi Zeng, Nejc Bezak, Pasquale Borrelli, Wei Dai, Subhankar Das, Panos Panagos, Zhihua Shi","doi":"10.1016/j.earscirev.2026.105733","DOIUrl":"https://doi.org/10.1016/j.earscirev.2026.105733","url":null,"abstract":"Increasing extreme rainfall requires reliable rainfall erosivity assessments, but empirical model applicability and performance remain poorly resolved. We reviewed historical model applications to identify recurring issues, then screened available models and compiled eligible regional equations into a multi-model ensemble. The ensemble and five previous global models were evaluated against station-based observations from the Global Rainfall Erosivity Database (GloREDa). We identified 19 issues involving input data, units, equations, applicable regions, and spatial scales. From 264 published model families, 78 families comprising 162 condition-specific equations were retained for ensemble construction and future application. Against in-situ GloREDa observations, the ensemble achieved an R<ce:sup loc=\"post\">2</ce:sup> of 0.69 and an RMSE of 1471 MJ·mm·ha<ce:sup loc=\"post\">−1</ce:sup>·h<ce:sup loc=\"post\">−1</ce:sup>·yr<ce:sup loc=\"post\">−1</ce:sup>, compared with R<ce:sup loc=\"post\">2</ce:sup> values of 0.30–0.47 and RMSE values of 2557–10,868 MJ·mm·ha<ce:sup loc=\"post\">−1</ce:sup>·h<ce:sup loc=\"post\">−1</ce:sup>·yr<ce:sup loc=\"post\">−1</ce:sup> for the previous models. The ensemble estimated a global mean erosivity of 2928 MJ·mm·ha<ce:sup loc=\"post\">−1</ce:sup>·h<ce:sup loc=\"post\">−1</ce:sup>·yr<ce:sup loc=\"post\">−1</ce:sup>. Temporal analysis demonstrated a slight growth of global rainfall erosivity since 1982, mainly reflecting a significantly increasing trend during 1991–2008. Trends ranged from −10 to 10 MJ·mm·ha<ce:sup loc=\"post\">−1</ce:sup>·h<ce:sup loc=\"post\">−1</ce:sup>·yr<ce:sup loc=\"post\">−1</ce:sup> across 74% of the assessed regions, while 6% showed trends below −50 or above 50 MJ·mm·ha<ce:sup loc=\"post\">−1</ce:sup>·h<ce:sup loc=\"post\">−1</ce:sup>·yr<ce:sup loc=\"post\">−1</ce:sup>. The ensemble leverages established empirical knowledge while prioritizing the application of equations within their development regions, thereby reducing errors from cross-regional transfer. It complements gridded products such as GloREDa by providing locally interpretable rainfall erosivity relationships that can be reproduced with relatively simple inputs. Remaining limitations include evaluation that is not fully independent, uneven model and observational coverage, and historical calibration relationships. Future assessments require independent evaluation, updated regional models, and improved precipitation inputs.","PeriodicalId":11483,"journal":{"name":"Earth-Science Reviews","volume":"6 1","pages":""},"PeriodicalIF":12.1,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149274836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic contribution by aquatic metabolism to carbon dioxide emissions from a low-land mixed land-use catchment","authors":"Hannah D. Conroy,&nbsp;David Butman,&nbsp;Jens Fölster,&nbsp;Emma E. Lannergård,&nbsp;Marcus B. Wallin","doi":"10.1002/lno.70531","DOIUrl":"https://doi.org/10.1002/lno.70531","url":null,"abstract":"<p>Carbon dioxide (CO₂) emissions from streams are globally significant despite their limited areal extent and rival those from terrestrial ecosystems. Agricultural land represents 40% of the world's landmass; still, the magnitude and source dynamics of CO₂ emissions from streams draining agricultural-influenced landscapes are poorly understood. We used high-frequency measurements of CO₂ and dissolved oxygen in a temperate low-land mixed land-use catchment (21% agricultural) to estimate emissions and the contribution of in-stream metabolism. Although CO₂ concentrations were high (median 3520 <i>μ</i>atm), emissions were relatively low (median 4.0 g C m² day⁻¹) due to consistently low gas transfer velocities (<i>k</i>₆₀₀). In-stream metabolism accounted for 46% of the emissions on average, which was higher than expected for a third-order stream. Emissions peaked during late summer despite low <i>k</i>₆₀₀. Emissions were instead driven by high CO₂ concentrations, highlighting the importance of CO₂ supply over physical drivers. We show that low-elevation human-impacted streams exhibit distinct emission dynamics, underscoring the need to account for biological drivers in carbon budgets for these landscapes.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 10","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70531","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149259390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blind Spots in Our Understanding of the Tropical Nitrogen Cycle","authors":"Kate M. Nelson,&nbsp;Samti Luk,&nbsp;Sian Kou-Giesbrecht,&nbsp;Michelle Y. Wong,&nbsp;Cara Flynn,&nbsp;Jacob Van Oorschot,&nbsp;Carla R. Reis Ely,&nbsp;Steven S. Perakis,&nbsp;Sarah A. Batterman,&nbsp;Cory C. Cleveland,&nbsp;Timothy Crews,&nbsp;Katherine A. Dynarski,&nbsp;Maria G. Gei,&nbsp;Michael J. Gundale,&nbsp;Duncan N. L. Menge,&nbsp;Mark B. Peoples,&nbsp;Sasha C. Reed,&nbsp;Emilio Rodríguez-Caballero,&nbsp;Anika P. Staccone,&nbsp;Benton N. Taylor,&nbsp;Bettina Weber,&nbsp;Nina Wurzburger,&nbsp;Fiona M. Soper","doi":"10.1029/2026GB009418","DOIUrl":"https://doi.org/10.1029/2026GB009418","url":null,"abstract":"<p>Understanding environmental controls on tropical nitrogen (N) cycling is critical for projecting flux rates and modeling ecosystem responses to rising CO₂. Here, we ask whether geographic bias in field sampling may shape our understanding of N cycling by failing to capture the breadth of environmental heterogeneity within the tropics. We mapped empirical sampling locations of two major ecosystem N inputs and outputs—biological nitrogen fixation and denitrification—paired with a wide range of variables thought to influence N cycling. Both single and multi-variate analyses revealed that sampling density is greater in productive, wet, fertile, warmer tropical ecosystems with low seasonality—areas expected to have higher process rates—but biased away from spatially extensive biomes which may have high process rate variability and thus higher uncertainty. Even within tropical broadleaf forests, sampling is biased toward sites with unusually high soil fertility (N and phosphorus), potentially skewing biome-wide averages. Although some geographically undersampled regions share environmental characteristics with well-studied sites, others are unique, compromising inference from existing data. Finally, we find that while sampled field locations capture the range of N cycle process means/variances predicted by an ensemble of terrestrial biosphere models, this may be the result of circularity in model parameters and driving data rather than true coverage, including overrepresentation of forest plant functional types that may be parameterized from a small subset of sites. Data coverage expansion into areas with novel environmental conditions and higher uncertainty could be used to assess and improve model parameterization, as well as test general hypotheses.</p>","PeriodicalId":12729,"journal":{"name":"Global Biogeochemical Cycles","volume":"40 10","pages":""},"PeriodicalIF":6.9,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026GB009418","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149259455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elastic Wave Stratigraphic Imaging Method for Impedance Relative Perturbation","authors":"Ruxun Dou,&nbsp;Shengchang Chen,&nbsp;Xinyue Gong,&nbsp;Wenhao Luo,&nbsp;Yawen Zhang,&nbsp;Haowen Xiao","doi":"10.1111/1365-2478.70277","DOIUrl":"https://doi.org/10.1111/1365-2478.70277","url":null,"abstract":"<div>\u0000 \u0000 <p>Elastic seismic data record the wavefield response to perturbations of subsurface elastic properties relative to a background medium. Imaging the corresponding responses can reveal the location, polarity and continuity of subsurface anomalies, providing physically interpretable attributes for stratigraphic characterization and anomaly delineation. However, conventional migration primarily emphasizes structural reflectivity, whereas fully iterative elastic inversion is computationally demanding and affected by multiparameter coupling. We therefore develop an elastic stratigraphic imaging (ESI) method based on reconstruction of the perturbation-induced virtual source. Under the Born approximation and a local plane-wave representation in a smooth isotropic background, modal projection yields a relative-perturbation matrix parameterized by P- and S-wave impedance and density, whose radiation coefficients describe the angle-dependent material sensitivities of the elastic modes. Compensation of the temporal factor in virtual-source generation increases the relative contribution of recorded low frequencies, favouring the broader-scale components of the impedance relative-perturbation response. Without explicit angle-domain decomposition, the resulting PP and PS images represent an approximate reconstruction of finite-band and acquisition-weighted elastic modal responses. Numerical experiments demonstrate the capability of ESI for elastic-impedance relative-perturbation imaging without iteration, with physically interpretable stratigraphic attributes for anomaly characterization.</p></div>","PeriodicalId":12793,"journal":{"name":"Geophysical Prospecting","volume":"74 9","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149259277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variability of Bright Deposits in North Polar Residual Ice Cap Craters on Mars","authors":"G. K. Shore,&nbsp;M. E. Landis,&nbsp;V. G. Rangarajan,&nbsp;S. Byrne,&nbsp;C. M. Dundas,&nbsp;S. S. Sutton,&nbsp;A. X. Wilcoski,&nbsp;P. O. Hayne","doi":"10.1029/2026JE009888","DOIUrl":"https://doi.org/10.1029/2026JE009888","url":null,"abstract":"<p>We use nearly a Mars decade of the Mars Reconnaissance Orbiter's High Resolution Imaging Science Experiment (HiRISE) camera observations to track surface changes in 36 small impact craters on Mars' Northern Residual Ice Cap, commonly considered to be the uppermost layer of the North Polar Layered Deposits (NPLD). Understanding the mass balance of the top layer of the NPLD could help decode the climate record buried within its layers, and understanding the mass change of the crater interiors could provide this crucial information. We detect changes in the bright floor deposits within these craters using HiRISE data, adding to the myriad of small temporal changes found on Mars' surface with this data set. We find that 32 sites exhibited changes in their bright deposits over time intervals up to a Mars decade, and four sites did not show any noticeable changes. This variability can be correlated with surrounding frost conditions outside the crater, indicating a connection between the seasonal frost cycle and long-term intra-crater mass balance. This work presents an overview of observational trends from the 32 crater sites and the domination of local seasonal frost in the behavior of these crater interiors.</p>","PeriodicalId":16101,"journal":{"name":"Journal of Geophysical Research: Planets","volume":"131 10","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2026JE009888","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149258746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wave diffraction modifies attenuation in semi-infinite submerged vegetation","authors":"Guanyi Gao,&nbsp;Yufei Wang,&nbsp;Jiarui Lei","doi":"10.1002/lno.70529","DOIUrl":"https://doi.org/10.1002/lno.70529","url":null,"abstract":"<p>Coastal vegetation is increasingly recognized for enhancing coastal resilience against climate change. Studies show that alternating vegetated and unvegetated patches can effectively dissipate wave energy, while emphasizing the need to better characterize wave diffraction in such configurations. In this study, we develop a semi-analytical framework that combines vegetation-induced wave attenuation with diffraction for regions partially covered by submerged vegetation and evaluate it using experiments. The model extends classical semi-infinite breakwater diffraction theory by incorporating Dalrymple-type dissipation due to an array of vegetation elements and an empirical lateral scaling that accounts for the porous nature of the vegetation. Under assumptions of spatially uniform vegetation within the vegetated region, laterally uniform incident waves, and linear wave dynamics, the local velocity potential is expressed as the incident potential multiplied by a modified diffraction coefficient. Twenty-one experiments were conducted in a shallow wave basin under varying wave heights, periods, and water depths for semi-infinite and periodically arranged vegetation patches. Comparisons between analytical predictions and over 15,000 wave-height measurements show that the model captures the dominant attenuation–diffraction patterns under the tested conditions, with a typical normalized RMSE of approximately 13%. The analysis clarifies how to estimate the wave decay coefficient in laterally non-uniform wave fields and demonstrates that, for the geometries tested, Dalrymple's formulation remains applicable when the wave decay coefficient is based on locally attenuated waves. This coupled diffraction–attenuation framework provides a practical tool for analyzing hydrodynamics in partially vegetated regions and for guiding the arrangement of vegetated patches in nature-based coastal-protection systems.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 10","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/lno.70529","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149258922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Root-induced preferential flow in the critical zone: Observations, processes, mechanisms, and modeling","authors":"Xiaohe Qian, Guotao Zhang, Peng Cui, Yao Jiang, L. Adrian Bruijnzeel, Jintao Liu, Haiyan Fang, Xinsen Chen, Jian Guo, Chao Ma, Chaoyue Li, Carlo Gualtieri, Nazir Ahmed Bazai, Dongfeng Li, Jiumao Xu, Guilin Han","doi":"10.1016/j.earscirev.2026.105734","DOIUrl":"https://doi.org/10.1016/j.earscirev.2026.105734","url":null,"abstract":"Root-induced preferential flow (RPF) is an important form of non-equilibrium water transport in vegetated critical zones, but its identification, controls, and hydrological consequences remain difficult to generalize because root-derived pathways coexist with cracks, faunal burrows, soil pipes, and lithological fractures. This review synthesizes 330 studies to clarify the evidence for root-specific preferential flow and its links to root characteristics, pathway properties, soil structure, and hydrological forcing. Four non-exclusive structural expressions of RPF are identified: shallow root network–dominated preferential flow (SRPF), vertical root-controlled preferential flow (VRPF), interface-guided preferential flow (IRPF), and legacy root-biopore–dominated preferential flow (BRPF). Across the reviewed literature, SRPF was reported most frequently (63.0%), followed by VRPF (56.1%), BRPF (35.8%), and IRPF (17.0%); these frequencies represent literature occurrence rather than ecosystem prevalence. Root architecture, abundance, mortality and decomposition influence pathway formation, whereas pathway connectivity, soil heterogeneity, antecedent wetness, and water-input conditions regulate their hydraulic expression. Consequently, RPF can enhance infiltration and subsurface redistribution, but its effects on storage, groundwater recharge, runoff timing, and peak discharge are context dependent. Apparent threshold-like responses are therefore better interpreted as changes in effective pathway connectivity than as universal rainfall or soil-moisture thresholds. Current understanding remains constrained by limited direct measurements linking root provenance, pathway geometry, connectivity, and flux, and by models that rarely represent the biological origin and temporal evolution of preferential pathways. Stronger root-specific experiments, repeated three-dimensional observations, and dynamic root-informed parameterization are needed to improve representation of RPF across scales.","PeriodicalId":11483,"journal":{"name":"Earth-Science Reviews","volume":"19 1","pages":""},"PeriodicalIF":12.1,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149274801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A viscosity model for hydrous andesitic melts: Insights from Sakurajima andesite","authors":"Pedro Valdivia, Jessica Streichert, Dmitry Bondar, Alessio Zandonà, Alexander Kurnosov, Joachim Deubener, Daniele Sonaglioni, Danilo Di Genova","doi":"10.1016/j.chemgeo.2026.123787","DOIUrl":"https://doi.org/10.1016/j.chemgeo.2026.123787","url":null,"abstract":"Magma viscosity governs transport, deformation, and eruptive dynamics. However, accurate predictions of melt viscosity remain challenging for hydrous andesitic systems, which are commonly associated with explosive volcanic activity. Widely used empirical models often fail to reproduce the rheological properties of hydrous volcanic melts because laboratory measurements can be compromised by amorphous nanostructuration, nanocrystallization, and <ce:italic>syn</ce:italic>-experimental water loss. Here, we present a physically based viscosity model for hydrous andesitic melts using both iron-bearing and iron-free analog compositions representative of the Sakurajima volcanic system. By combining differential scanning calorimetry, viscometry, Raman spectroscopy, and Brillouin spectroscopy, we quantify the effects of temperature, water content, and transition metal concentration (e.g., Fe, Ti and Mn) on melt viscosity through their influence on the glass transition temperature and melt fragility. Flash calorimetry shows that the configurational heat-capacity step at the glass transition, relative to the glass heat capacity, increases with water content, consistent with the increase of melt fragility. Our results indicate that the widely used <ce:cross-ref ref>Giordano et al. (2008)</ce:cross-ref> model systematically overestimates melt viscosity under pre-eruptive conditions. For Sakurajima andesitic melt, our model predicts a pre-eruptive viscosity about 9 times lower than the estimate of the <ce:cross-ref ref>Giordano et al. (2008)</ce:cross-ref> model; similar overestimations, by up to a factor of 27, are also identified in other andesitic systems. These lower viscosities may affect estimates of magma ascent rates, viscosity gradients during degassing and fragmentation conditions, which remain to be quantified using conduit flow models.","PeriodicalId":9847,"journal":{"name":"Chemical Geology","volume":"21 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2026-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149274622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phosphorus enrichment enhances planktonic carbon transfer efficiency in warm eutrophic systems dominated by cyanobacteria or chlorophytes by alleviating stoichiometric constraint","authors":"Qiuqi Lin,&nbsp;Pengyu Lin,&nbsp;Lin Li,&nbsp;Fangqiong Lin,&nbsp;Lijuan Xiao,&nbsp;Yali Tang","doi":"10.1002/lno.70530","DOIUrl":"https://doi.org/10.1002/lno.70530","url":null,"abstract":"<p>In eutrophic systems dominated by chlorophytes or cyanobacteria, low carbon transfer efficiency from phytoplankton to zooplankton is typically attributed to biochemical deficiencies. However, under high light and nutrients, these groups can exhibit strong carbon fixation relative to phosphorus acquisition. How this nutrient use efficiency affects herbivore efficiency (HE; zooplankton-to-phytoplankton productivity ratio) in tropical eutrophic systems remains unclear. We conducted two nutrient-manipulation mesocosm experiments using plankton communities from a tropical eutrophic reservoir during the flood (chlorophyte-dominated) and dry (cyanobacteria-dominated) seasons. In both experiments, unamended mesocosms exhibited low HE (&lt; 0.05) and low zooplankton-to-phytoplankton biomass ratio (Z : P; &lt; 0.15), along with substantial C : P, C : N, and n-3 highly unsaturated fatty acids (<i>n</i>-3 HUFA) mismatches between phytoplankton and zooplankton. Phosphorus enrichment improved HE and Z : P by reducing C : P mismatch, despite concurrently increasing C : N and <i>n</i>-3 HUFA mismatches. Notably, P addition triggered transient HE spikes exceeding 0.1, coinciding with Z : P values of ~ 0.5 in the cyanobacteria-dominated system and &gt; 1 in the chlorophyte-dominated system. In contrast, N enrichment reduced C : N mismatch but increased C : P mismatch, with negligible effects on HE and Z : P. These findings suggest that phytoplankton phosphorus use efficiency is an important driver of HE in tropical eutrophic systems. Under low planktivorous fish predation, transient high carbon transfer from chlorophytes or cyanobacteria to herbivores may occur when zooplankton C : P requirements are met and ample complementary foods compensate for inherent biochemical deficiencies. With ongoing eutrophication and climate change expected to intensify cyanobacterial dominance in tropical regions, these stoichiometric and biochemical constraints on HE are likely to shape food web dynamics and ecosystem functioning.</p>","PeriodicalId":18143,"journal":{"name":"Limnology and Oceanography","volume":"71 10","pages":""},"PeriodicalIF":3.5,"publicationDate":"2026-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149259073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}