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    Optimizing irrigation and nitrogen levels for improved soil nitrogen dynamics and use efficiency in temperate ecology of Kashmir

    AbstractThe present study aimed to evaluate nitrogen dynamics and use efficiency of transplanted rice under variable irrigation regimes and nitrogen levels. Two field experiments were conducted during the 2021 and 2022 rice-growing seasons using a split-plot design with four irrigation treatments in the main plots and four nitrogen levels in the sub-plots, each replicated thrice. Results indicated that nitrogen concentration and uptake by grain and straw were significantly influenced by both irrigation scheduling and nitrogen application. Among irrigation treatments, recommended scheduling and irrigation at field capacity produced the highest nitrogen concentration and uptake, whereas 10 and 20% depletion from field capacity resulted in lower values. For nitrogen levels, 125% of the recommended dose (RDN) recorded the highest grain nitrogen content and uptake, but values were statistically similar to 100% RDN. Flooded rice cultivation led to the greatest nitrogen removal from soil, followed by field capacity and deficit irrigation treatments. The highest nitrogen use efficiency was observed under deficit irrigation, followed by field capacity, while flooded irrigation was the least efficient. Adequate irrigation (I1/I2) resulted in the highest nitrogen uptake and grain yield, while deficit irrigation (I4) saved water but led to lower yield and nitrogen use efficiency, with greater amounts of residual nitrogen remaining in the soil. Overall, applying irrigation at field capacity combined with 100% RDN was found optimal for maximizing nutrient uptake and nitrogen use efficiency in transplanted rice, suggesting a sustainable approach to improve resource use without over-application of water or fertilizer.

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    Data availability

    The datasets used and/or analysed during the current study available from the corresponding author on reasonable request.
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    Download referencesAcknowledgementsThe authors wish to thank Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2025R365), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia for supporting this studyFundingOpen Access funding enabled and organized by Projekt DEAL. This work is supported by Princess Nourah bint Abdulrahman University Researchers Supporting Project number (PNURSP2025R365), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia for supporting this study. The article processing charge was funded by the Open Access Publication Fund of Humboldt-Universität zu Berlin.Author informationAuthors and AffiliationsDivision of Agronomy, Faculty of Agriculture, Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, WaduraSopore, 193201, IndiaMohd Salim Mir, Waseem Raja, Raihana Habib Kanth, Amal Saxena & Lal SinghSher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, Wadura, 190006, IndiaEajaz Ahmad DarWest Florida Research and Education Centre, University of Florida, Jay, FL, 32565, USAEajaz Ahmad DarDivision of Agricultural Extension, Faculty of Agriculture, Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, WaduraSopore, 193201, IndiaZahoor Ahmad ShahDivision of Entomology, Faculty of Agriculture, Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, WaduraSopore, 193201, IndiaDanishta AzizDepartment of Biology, College of Science, Princess Nourah Bint Abdulrahman University, P. O. Box 84428, 11671, Riyadh, Saudi ArabiaLaila A. Al-Shuraym & Lamya Ahmed AlkeridisDirectorate of Research, Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, WaduraSopore, 190025, IndiaParmeet SinghDivision of Genetics and Plant Breeding, Faculty of Agriculture, Sher-E-Kashmir University of Agricultural Sciences and Technology of Kashmir, WaduraSopore, 193201, IndiaUmer FayazHead and Principal Scientist (Agril Extension), Division of Agricultural Extension, ICAR-IARI, New Delhi, India SatyapriyaDepartment of Crop and Animal Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Faculty of Life Sciences, Humboldt-Universität Zu Berlin, Albrecht-Thaer-Weg 5, 14195, Berlin, GermanyAmged El-HarairyUnit of Entomology, Plant Protection Department, Desert Research Center, 1 Mathaf El-Matariya St., El-Matariya, Cairo, 11753, EgyptAmged El-HarairyDepartment of Plant Protection, Faculty of Agriculture, Zagazig University, Zagazig, 44511, Sharkia, EgyptAhmed A. A. AioubDepartment of Economic Entomology and Pesticides, Faculty of Agriculture, Cairo University, Giza, 12613, EgyptSamy SayedAuthorsMohd Salim MirView author publicationsSearch author on:PubMed Google ScholarWaseem RajaView author publicationsSearch author on:PubMed Google ScholarRaihana Habib KanthView author publicationsSearch author on:PubMed Google ScholarEajaz Ahmad DarView author publicationsSearch author on:PubMed Google ScholarZahoor Ahmad ShahView author publicationsSearch author on:PubMed Google ScholarDanishta AzizView author publicationsSearch author on:PubMed Google ScholarLaila A. Al-ShuraymView author publicationsSearch author on:PubMed Google ScholarLamya Ahmed AlkeridisView author publicationsSearch author on:PubMed Google ScholarParmeet SinghView author publicationsSearch author on:PubMed Google ScholarAmal SaxenaView author publicationsSearch author on:PubMed Google ScholarLal SinghView author publicationsSearch author on:PubMed Google ScholarUmer FayazView author publicationsSearch author on:PubMed Google Scholar SatyapriyaView author publicationsSearch author on:PubMed Google ScholarAmged El-HarairyView author publicationsSearch author on:PubMed Google ScholarAhmed A. A. AioubView author publicationsSearch author on:PubMed Google ScholarSamy SayedView author publicationsSearch author on:PubMed Google ScholarContributionsAll authors conceived and designed the study and experiments; MSM, WR, RHK, EAD, ZAH, DA, PS, AS, LS, UF and DS performed the experiments; LAA-S, LAA, AAA, SS, and AE analyzed the data, and wrote the manuscript; All authors reviewed and approved the final manuscript.Corresponding authorsCorrespondence to
    Zahoor Ahmad Shah, Amged El-Harairy or Samy Sayed.Ethics declarations

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    The authors declare no competing interests.

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    Reprints and permissionsAbout this articleCite this articleMir, M.S., Raja, W., Kanth, R.H. et al. Optimizing irrigation and nitrogen levels for improved soil nitrogen dynamics and use efficiency in temperate ecology of Kashmir.
    Sci Rep (2025). https://doi.org/10.1038/s41598-025-32465-1Download citationReceived: 05 September 2025Accepted: 10 December 2025Published: 30 December 2025DOI: https://doi.org/10.1038/s41598-025-32465-1Share this articleAnyone you share the following link with will be able to read this content:Get shareable linkSorry, a shareable link is not currently available for this article.Copy shareable link to clipboard
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    KeywordsIrrigationNitrogenNutrient uptakeTransplanted riceFlooded riceNitrogen use efficiency More

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    Minor effects of nutrient additions on soil microbial carbon use efficiency

    AbstractThe carbon use efficiency (CUE) of soil microbes is defined as the proportion of assimilated carbon (C) allocated to microbial growth than lost through respiration. CUE is a critical parameter in soil C cycling, and its response to external nutrient inputs (including nitrogen [N], phosphorus [P], and combined NP) could determine the change of soil C pool. However, the general pattern of CUE response to nutrient addition remains unclear. By conducting a global meta-analysis of 427 observations, we found that the nutrient addition had no significant overall effect on CUE, whether in the overall nutrient addition experiments or in experiments with different types of nutrient addition. The response of CUE to N addition was regulated by duration, with long-term addition (>10 year) leading to a decrease in CUE. We identified the aridity index as the most important predictor influencing CUE in response to N addition, while ecosystem type was the most key variable for CUE response to both P and NP additions. Global predictions showed future N inputs tends to enhance CUE across most regions, especially in cropland ecosystems. Overall, the effect of nutrient addition on CUE was relatively minor, providing key microbial evidence for understanding future soil C dynamics.

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    Data availability

    The data that support the findings of this study are openly available in figshare at https://doi.org/10.6084/m9.figshare.30702806.
    Code availability

    The code that support the findings of this study are openly available in figshare at https://doi.org/10.6084/m9.figshare.30702806.
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    Nanostructured lipid carrier of oregano essential oil for controlling Tuta absoluta with minimal impact on beneficial organisms

    AbstractTuta absoluta is a significant invasive pest, severely impacting the global tomato industry. Prolonged application of chemical insecticides has led to varying degrees of resistance in T. absoluta populations. Additionally, chemical insecticides are causing serious threats to the environment. Aiming to develop a novel bioinsecticide based on Origanum vulgare essential oil (OVE) against T. absoluta, we carried out its nanostructured lipid carrier formulation (OVE-NLC). The obtained OVE-NLC had spherical particles approximately 94.26 nm in size with a uniform size distribution of less than 0.3 and a zeta potential of − 18.75 mV. The formulated NLC also had encapsulation efficiency up to 96% and was stable at 25 °C for 3 months. The FTIR results indicated no significant chemical interaction between EO and NLC components. OVE-NLC demonstrated significant toxicity towards T. absoluta larvae and a remarkable oviposition deterrence for females. The nanoformulation also negatively affected the population growth parameters of T. absoluta, significantly reducing its fecundity by approximately 70% and 42% in contact and topical assays, respectively. Additionally, OVE-NLC had no lethal effects on the generalist predator Macrolophus pygmaeus and pollinator bee Bombus terrestris as non-target organisms. Results suggested that OVE-NLC could be successfully used as a potential tool for tomato integrated pest management programs.

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    Download referencesAcknowledgementsFinancial support from the Deputy of Research and Technology of Urmia University, Urmia, Iran (Number: 10/1352) is acknowledged.FundingThis study was funded by Urmia University, Iran (Number: 10/1352).Author informationAuthors and AffiliationsDepartment of Plant Protection, Faculty of Agriculture, Urmia University, Urmia, IranAsmar Soleymanzadeh & Orouj ValizadeganDrug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, IranHamed HamishehkarResearch Center of New Material and Green Chemistry, Khazar University, Baku, AzerbaijanHamed HamishehkarAuthorsAsmar SoleymanzadehView author publicationsSearch author on:PubMed Google ScholarOrouj ValizadeganView author publicationsSearch author on:PubMed Google ScholarHamed HamishehkarView author publicationsSearch author on:PubMed Google ScholarContributionsAS, OV, and HH conceived and designed the experiments. AS collected data and carried out the bioassays. AS and OV analyzed the data. AS wrote the first draft of the manuscript, and OV and HH revised and improved it. All authors read and approved the manuscript.Corresponding authorCorrespondence to
    Orouj Valizadegan.Ethics declarations

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    The authors declare no competing interests.

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    Reprints and permissionsAbout this articleCite this articleSoleymanzadeh, A., Valizadegan, O. & Hamishehkar, H. Nanostructured lipid carrier of oregano essential oil for controlling Tuta absoluta with minimal impact on beneficial organisms.
    Sci Rep (2025). https://doi.org/10.1038/s41598-025-33492-8Download citationReceived: 24 August 2025Accepted: 19 December 2025Published: 30 December 2025DOI: https://doi.org/10.1038/s41598-025-33492-8Share this articleAnyone you share the following link with will be able to read this content:Get shareable linkSorry, a shareable link is not currently available for this article.Copy shareable link to clipboard
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    Honey bee food resources under threat from climate change

    AbstractPlant-pollinator interactions are essential for plant productivity but face growing threats from climate change, including vegetation loss and mismatches in flowering. Yet, the consequences for bee food resources remain poorly understood at continental scales. Here, we analyse 2 500 samples collected by honey bees (Apis mellifera) between May and August 2023 from 310 locations across Europe using ITS2 metabarcoding. We derive climatic response curves of floral resources and assess exceedance risks of interaction loss under projected climate scenarios. Our findings reveal that rising temperatures and reduced precipitation decrease the diversity of foraging resources across Europe, pushing many plants beyond critical limits. When both warming and drying coincide, the potential for resilience through temporal or spatial buffering is strongly constrained. These declines pose serious risks to bee nutrition, ecosystem functioning, and food security. Our study underscores the urgency of mitigating climate change to preserve vital plant-pollinator systems and the services they sustain.

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    Data availability

    The raw sequencing data generated in this study have been deposited in the NCBI SRA database under accession code PRJNA1198597. The processed sequencing data (for process see code availability), climate data, and metadata of samples are available at Zenodo 10.5281/zenodo.17578272 [https://doi.org/10.5281/zenodo.17578272]77 and GitHub chiras/HoneyBee-ResistanceResilience [https://github.com/chiras/HoneyBee-ResistanceResilience].
    Code availability

    The pipeline for processing raw sequencing data for metabarcoding is publicly available at GitHub chiras/metabarcoding_pipeline [https://github.com/chiras/metabarcoding_pipeline]. Code for all downstream analyses is publicly available at Zenodo 10.5281/zenodo.17578272 [https://doi.org/10.5281/zenodo.17578272]77 and GitHub chiras/HoneyBee-ResistanceResilience [https://github.com/chiras/HoneyBee-ResistanceResilience]. All display items presented in the main manuscript and supplementary information can be reproduced from this public data and code.
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    M. Alice Pinto or Alexander Keller.Ethics declarations

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    The authors declare no competing interests.

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    Reprints and permissionsAbout this articleCite this articleQuaresma, A., Baveco, J.M., Brodschneider, R. et al. Honey bee food resources under threat from climate change.
    Nat Commun (2025). https://doi.org/10.1038/s41467-025-68085-6Download citationReceived: 04 February 2025Accepted: 16 December 2025Published: 30 December 2025DOI: https://doi.org/10.1038/s41467-025-68085-6Share this articleAnyone you share the following link with will be able to read this content:Get shareable linkSorry, a shareable link is not currently available for this article.Copy shareable link to clipboard
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    A scenario-based modelling approach to implementing nature-based solutions for flood risk mitigation in Hannover

    AbstractThe EU Nature Restoration Regulation suggests the implementation of green space as nature-based solutions to enhance urban resilience toward increasing climate risks such as extreme precipitation events and floods in Europe. Scenario based approaches enable the evaluation of the potential of specific nature-based solutions to mitigate flood risk in high flood hazard and vulnerable areas. In this study, we explore the flood risks from heavy rainfall and the potential of nature-based solutions implementations in the city of Hannover, Germany. Using the InVEST urban flood risk mitigation model, we modelled the surface runoff from heavy rainfall and assessed the social vulnerability using population and infrastructure data resulting in a flood risk evaluation. To test flood mitigation under nature-based solutions implementations including grass grid pavers and green roofs, we estimated the runoff improvement under three nature-based solutions scenarios following recommendations from the EU Nature Restoration Regulation. Our analysis revealed that Hannover’s inner-city area is particularly flood-prone and socially vulnerable, while peripheral districts are less affected. The combined risk and vulnerability arise from the surface sealing in built-up areas and their higher population density and associated infrastructure. The scenario results demonstrate flood risk reduction potential when combining different nature-based solutions, though on a limited level calling for more explicit and ambitious regulations at EU, regional and local levels.

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    Nadja Kabisch.Ethics declarations

    Competing interests
    The authors declare no competing interests.

    Additional informationPublisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.Supplementary informationSuplementary materialRights and permissions
    Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
    Reprints and permissionsAbout this articleCite this articleSchröder, P.T., Wübbelmann, T. & Kabisch, N. A scenario-based modelling approach to implementing nature-based solutions for flood risk mitigation in Hannover.
    npj Urban Sustain (2025). https://doi.org/10.1038/s42949-025-00326-5Download citationReceived: 25 June 2025Accepted: 12 December 2025Published: 30 December 2025DOI: https://doi.org/10.1038/s42949-025-00326-5Share this articleAnyone you share the following link with will be able to read this content:Get shareable linkSorry, a shareable link is not currently available for this article.Copy shareable link to clipboard
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    Spatial analysis of malaria incidence and environmental determinants in Hadiya Zone, Ethiopia

    AbstractMalaria remains a leading cause of morbidity and mortality in the developing world, particularly in sub-Saharan Africa. Spatial variability significantly influences efforts to control malaria and its incidence, which remains a serious public health concern in Ethiopia. Using geostatistical methods, this study investigates the environmental factors and spatial distribution of malaria incidence in the Hadiya Zone across woredas in 2022 and 2023. Descriptive analyses revealed consistent spatial heterogeneity, with high incidence rates in Shashogo, Soro, and Misrak Badawacho. Global spatial autocorrelation measures Moran’s I (0.558 in 2022 and 0.483 in 2023; p < 0.01) and Geary’s C (0.63 and 0.69, respectively) confirmed statistically significant clustering of malaria cases. Local Moran’s I analysis identified hot spots in Shashogo, Soro, and Misrak Badawacho, and cold spots in Misha, Duna, and Gombora, indicating localized spatial dependence. Spatial regression analysis, comparing Ordinary Least Squares (OLS) and Spatial Autoregressive (SAR) models, highlighted average maximum temperature (β = 0.945, p = 0.017) and proportion of highland terrain (β = 0.543, p = 0.040) as key predictors of malaria incidence. The SAR model showed superior fit, evidenced by lower AIC and higher log-likelihood values, confirming the influence of spatial dependence. These findings support geographically targeted malaria interventions in high-risk woredas. Limitations include the short study period (2022–2023) and the absence of socioeconomic variables due to lack of household survey and secondary data.

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    Data availability

    The datasets generated and/or analyzed during the current study are not publicly available and must be obtained from the corresponding author upon reasonable request. The data were sourced from the Hadiyya Zone Health Bureau, the SNNPR Meteorological Center, and the Hadiyya Zone Agricultural and Finance Bureaus, and access requires official permission from the respective agencies.
    AbbreviationsSAR:
    Spatial autoregressive model
    OLS:
    Ordinary least squares
    AIC:
    Akaike information criterion
    LM:
    Lagrange multiplier
    SNNPR:
    Southern nations, nationalities, and peoples’ region
    WHO:
    World health organization
    GIS:
    Geographic information system
    ARC GIS:
    A specific GIS software platform
    ITN:
    Insecticide-treated nets
    IRS:
    Indoor residual spraying
    RF:
    Rainfall
    MIT:
    Minimum temperature
    MAT:
    Maximum temperature
    LL:
    Log-likelihood
    GMI:
    Global Moran’s I
    LCI:
    Local Moran’s I
    Geary’s C:
    Geary’s contiguity ratio
    API:
    Annual parasite incidence
    MoH:
    Ministry of health
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    R Core Team. R: A language and environment for statistical computing. Vienna: R Foundation for Statistical Computing. (2023). Available from: https://www.R-project.org/Download referencesAcknowledgementsThe author gratefully acknowledges Wachemo University (WCU) for granting ethical approval and institutional support for this study. Appreciation is extended to the Hadiyya Zone Health Bureau, the SNNPR Meteorological Center, and the Hadiyya Zone Agricultural and Finance Bureaus for providing the necessary data. Special thanks are due to the health facility staff and local administrators in Hadiyya Zone for their cooperation during data collection.FundingThis research was conducted without any external funding support.Author informationAuthors and AffiliationsDepartment of Statistics, College of Natural and Computational Sciences, Wachemo University, P.O. Box 667, Hossana, EthiopiaShambel Selman AbdoAuthorsShambel Selman AbdoView author publicationsSearch author on:PubMed Google ScholarContributionsS.S.A. conceived and designed the study, acquired and analyzed the data, interpreted the results, prepared all figures and tables, and wrote the entire manuscript. S.S.A. also reviewed and approved the final version of the manuscript.Corresponding authorCorrespondence to
    Shambel Selman Abdo.Ethics declarations

    Competing interests
    The authors declare no competing interests.

    Ethical approval
    Ethical clearance for this study was obtained from the Institutional Review Board (IRB) of Wachemo University (WCU 17.2023). The study was based on secondary data without personal identifiers. All methods were performed in accordance with the relevant guidelines and regulations of Wachemo University and national research ethics standards. All necessary permissions were secured from relevant health and administrative offices in the Hadiyya Zone to ensure the ethical use of the data.

    Informed consent
    As the study utilized secondary, de-identified data and did not involve direct interaction with human participants, informed consent was not applicable. However, permission to use the data was formally obtained from the appropriate authorities.

    Additional informationPublisher’s noteSpringer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.Supplementary InformationBelow is the link to the electronic supplementary material.Supplementary Material 1Rights and permissions
    Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.
    Reprints and permissionsAbout this articleCite this articleAbdo, S.S. Spatial analysis of malaria incidence and environmental determinants in Hadiya Zone, Ethiopia.
    Sci Rep (2025). https://doi.org/10.1038/s41598-025-33236-8Download citationReceived: 09 July 2025Accepted: 17 December 2025Published: 30 December 2025DOI: https://doi.org/10.1038/s41598-025-33236-8Share this articleAnyone you share the following link with will be able to read this content:Get shareable linkSorry, a shareable link is not currently available for this article.Copy shareable link to clipboard
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    KeywordsMalariaIncidenceGeostatistics and spatial autocorrelation More

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    An ecological element for selecting enhancement stock based on the stability of nekton community structure

    Abstract

    The abundance-biomass comparison curves (ABC curves) method was adopted to analyze the temporal stability of the fish and nekton community structure in Laoshan Bay, China, during the spring and summer seasons from 2013 to 2015. This study aimed to explore the feasibility of using stable species in the nekton structure as stock enhancement candidates and to enrich the guidelines for responsible stock enhancement. Results showed that the W-statistic values of ABC curves for nekton were generally higher than those for fish across the three years’ spring and summer seasons. For fish, the biomass curves were often located below their abundance curves; in contrast, the biomass curves of nekton were generally positioned above their abundance curves or intersected with them. These findings indicated that the nekton community structure was more complex and stable than that of the fish community. Portunus trituberculatus played an important role in maintaining the stability of nekton community structure during spring and summer. Therefore, stock enhancement of P. trituberculatus in Laoshan Bay every spring could improve the stability of nekton community structure in the subsequent summer through trophic relationships. Given that ABC curves have a solid ecological theoretical basis, the stability of nekton structure could be one of joint ecological elements for selecting stock enhancement species.

    Data availability

    The datasets used and analysed during the current study available from the corresponding author on reasonable request.
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    Zhong Yi Li.Ethics declarations

    Competing interests
    The authors declare no competing interests.

    Additional informationPublisher’s noteSpringer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.Rights and permissions
    Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.
    Reprints and permissionsAbout this articleCite this articleLi, Z., Lin, Q. An ecological element for selecting enhancement stock based on the stability of nekton community structure.
    Sci Rep (2025). https://doi.org/10.1038/s41598-025-33783-0Download citationReceived: 10 April 2025Accepted: 22 December 2025Published: 30 December 2025DOI: https://doi.org/10.1038/s41598-025-33783-0Share this articleAnyone you share the following link with will be able to read this content:Get shareable linkSorry, a shareable link is not currently available for this article.Copy shareable link to clipboard
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    KeywordsLaoshan bayCommunity structureABC curvesStock enhancementSpecies selection More

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    Extreme temperature events reshuffle the ecological landscape of the Southern Ocean

    AbstractExtreme temperature events are becoming widespread with global warming, impacting phytoplankton, the foundation of the marine ecosystem. In the Southern Ocean, these impacts are not well understood, despite the key role of phytoplankton in global carbon cycling and climate. Here, we use 26 years of satellite observations and confirm previously identified impacts of marine heatwaves (MHWs) on phytoplankton in the Southern Ocean, while systematically comparing the opposite impacts of marine cold spells (MCSs). MHWs decrease phytoplankton chlorophyll-a (Chl-a) in subtropical regions (−21.11%) but less so in polar regions, with Chl-a even increasing in the Sub-Antarctic Zone ( + 22.26%). MCSs exhibit opposite patterns, enhancing Chl-a in subtropical regions ( + 32.37%) while inhibiting it in southern regions (−21.19%). These regional differences in Chl-a anomalies are mediated by distinct responses in phytoplankton size composition to MHWs and MCSs. As extreme events intensify with global warming, Southern Ocean’s phytoplankton will be disrupted, with implications for global biogeochemical cycles. These findings highlight the importance of simultaneously considering both MHWs and MCSs when assessing the ecological impacts of climate extremes.

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    Data availability

    The daily SST-CCI (version 3.0) and SIC data are provided by ESA from their website: https://doi.org/10.5285/4a9654136a7148e39b7feb56f8bb02d2. The daily Rrs-CCI and kd (version 6.0) data are provided by ESA from their website: https://rsg.pml.ac.uk/thredds/catalog-cci.html. The PAR data are provided by GlobColour from their website: https://hermes.acri.fr/index.php?class=archive. The nitrate data provided by CMEMS from their website: https://doi.org/10.48670/moi-00019. The MLD (GLORYS12V1) data provided by CMEMS from their website: https://doi.org/10.48670/moi-00021. The HPLC data provided by PANGAEA from their website: https://doi.org/10.1594/PANGAEA.938703. The HPLC data provided by ADON from their website: https://portal.aodn.org.au/search. The data used to generate the figures presented in this study are available via figshare at https://doi.org/10.6084/m9.figshare.3021702187.
    Code availability

    The analyses were performed using MATLAB and Python; the main code used in this study is available at https://doi.org/10.5281/zenodo.1722329288, with BGC-Argo data processing based on code from https://github.com/NOAA-PMEL/OneArgo-Mat and MHWs/MCSs detection using code from https://github.com/ZijieZhaoMMHW/m_m hw1.0.
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    (摆智敏), Lin Deng 
    (邓霖), Wenbo He 
    (何文博), Qilin Chunpi 
    (七林春批) & Jun Zhao 
    (赵俊)Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, Guangdong, ChinaLin Deng 
    (邓霖) & Jun Zhao 
    (赵俊)Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Zhuhai, Guangdong, ChinaLin Deng 
    (邓霖) & Jun Zhao 
    (赵俊)Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou, Guangdong, ChinaLin Deng 
    (邓霖) & Jun Zhao 
    (赵俊)Centre for Geography and Environmental Science, Department of Earth and Environmental Sciences, Faculty of Environment, Science and Economy, University of Exeter, Penryn, Cornwall, UKRobert J. W. BrewinAuthorsZhimin Bai 
    (摆智敏)View author publicationsSearch author on:PubMed Google ScholarLin Deng 
    (邓霖)View author publicationsSearch author on:PubMed Google ScholarRobert J. W. BrewinView author publicationsSearch author on:PubMed Google ScholarWenbo He 
    (何文博)View author publicationsSearch author on:PubMed Google ScholarQilin Chunpi 
    (七林春批)View author publicationsSearch author on:PubMed Google ScholarJun Zhao 
    (赵俊)View author publicationsSearch author on:PubMed Google ScholarContributionsB.Z.M. and D.L. conducted data processing and analysis under Z.J.’s instruction. H.W.B. provided the conceptual framework. H.W.B. and Q. C. contributed data and algorithms. B.Z.M. drafted the initial manuscript, and Z.J. and R.J.W.B. reviewed the paper.Corresponding authorCorrespondence to
    Jun Zhao 
    (赵俊).Ethics declarations

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    The authors declare no competing interests.

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    Reprints and permissionsAbout this articleCite this articleBai, Z., Deng, L., Brewin, R.J.W. et al. Extreme temperature events reshuffle the ecological landscape of the Southern Ocean.
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