{"title":"Enhancing performance in gravity-driven membrane systems through pre-coating with aluminum-based flocs: Mechanism and energy saving analysis.","authors":"Yazhou Sun, Zedong Lu, Xing Li, Shaozhu Wang, Jianyong Feng, Yanling Yang, Zhiwei Zhou, Jiawei Ren, Heng Liang","doi":"10.1016/j.jenvman.2024.123725","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123725","url":null,"abstract":"<p><p>The gravity-driven membrane (GDM) system is an energy-efficient and environmentally sustainable water purification process; however, after prolonged operation, its membrane flux remains relatively low, making it necessary to adopt effective strategies for improving system performance. In this study, the effects of hydrostatic pressure (60, 100, 200 mbar) and pre-coating with aluminum-based flocs (ABF) on GDM flux and organic matter removal were investigated, and the regulatory mechanisms of the bio-cake layer were explored through interactions between morphological structure, composition and microbes. The results showed that the stable flux of the GDM-ABF system at a hydrostatic pressure of 60 mbar was almost equal to that at 100 mbar, and it outperformed higher hydrostatic pressure in organic matter removal, resulting in a more porous bio-cake layer structure. GDM-ABF system at 60 mbar achieved 38.51% energy saving compared to that at 100 mbar. Increased hydrostatic pressure led to a denser biofouling layer and higher EPS concentrations, whereas pre-coating reduced the EPS concentration and resulted in a looser biofouling layer. Hydrostatic stress and pre-coating determined membrane fouling by regulating microbial communities and key metabolites. Increasing hydrostatic pressure down-regulated arginine and proline metabolism and aggravated membrane fouling, while pre-coating ABF up-regulated arginine and proline metabolism, down-regulated galactose metabolism, and alleviated the membrane fouling. Hydrostatic stress and pre-coating altered the abundance of keystone species involved in extracellular polymeric substances (EPS) formation within the bio-cake layer. Pre-coating with ABF at low hydrostatic pressure can achieve stable flux and effective water purification in GDM systems, similar to high hydrostatic pressure conditions, with the added benefits of being more environmentally friendly and low-carbon. This study proposes a strategy to balance flux and energy consumption in GDM systems, providing theoretical and technical support for the efficient application of GDM technology in membrane water treatment processes.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123725"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bing Yao, Min Liu, Jin Zhang, Xuan Hu, Bin Wang, Ren-Jun Liang, Ying Chen
{"title":"Effect of long-term exposure to non-biodegradable and biodegradable microplastics in continuous anoxic/aerobic bioreactors: Nitrogen removal performance, microbial communities and functional gene responses.","authors":"Bing Yao, Min Liu, Jin Zhang, Xuan Hu, Bin Wang, Ren-Jun Liang, Ying Chen","doi":"10.1016/j.jenvman.2024.123712","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123712","url":null,"abstract":"<p><p>The environmental hazards caused by microplastics (MPs) have received widespread attention, but the effects of non-biodegradable and biodegradable MPs of long-term presence on continuously operating sewage treatment bioreactors are not well known. In this study, we investigated the effect of a representative non-biodegradable MP, polyethylene terephthalate (PET), and a biodegradable MP, polylactic acid (PLA), on the nitrogen removal performance of conventional anoxic/aerobic (A/O) process. The NH<sub>4</sub><sup>+</sup>-N removal efficiencies were suppressed to 91.7 ± 5.5% and 80.8 ± 4.1% at concentrations of 10 and 100 mg/L PLA, significantly (p < 0.05) lower than 96.3 ± 1.0% and 95.0 ± 1.5% with the presence of PET. PLA resulted in a significant (p < 0.05) decrease in adenosine triphosphate of living cells (cATP) and dehydrogenase activities. PLA enhanced redox stress and induced a series of oxidative stress reactions that were detrimental to the normal growth and metabolism of microorganisms. The relative abundance of several functional microorganisms (Nitrosomonas,Nitrospira and Ellin6067) and genes (amoA, amoB and amoC) associated with NH<sub>4</sub><sup>+</sup>-N conversion were reduced. The potential risk of biodegradable MPs to the long-term wastewater treatment process cannot be ignored and needs to be emphasized.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123712"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yi Su, Yang Li, Wu Zhou, Weizhe Jie, Hua Zhang, Hongwei Ni
{"title":"A green integrated process for phosphogypsum recycling: CO<sub>2</sub> sequestration combined with SO<sub>2</sub> recovery.","authors":"Yi Su, Yang Li, Wu Zhou, Weizhe Jie, Hua Zhang, Hongwei Ni","doi":"10.1016/j.jenvman.2024.123707","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123707","url":null,"abstract":"<p><p>An integrated process was constructed combining ammonia-enhanced CO<sub>2</sub> sequestration and low-temperature preparation of SO<sub>2</sub> to achieve efficient recovery and comprehensive utilization of the main element in phosphogypsum (PG). The entire integrated process could mitigate the environmental issue of PG stacking and the CO<sub>2</sub> concentration, as well as yield high value-added product of SO<sub>2</sub>. PG obtained its maximum carbonation ratio of 91% within 40 min, and transformed to micro-sized fine CaCO<sub>3</sub>. The carbonation by-product of ammonium sulfate was used to stepwise recover NH<sub>3</sub> and SO<sub>2</sub>, with the catalyze of iron scales. Under optimal conditions, SO<sub>2</sub> recovery of 97% was attained and 84% of NH<sub>3</sub> can be recycled for CO<sub>2</sub> sequestration. Furthermore, the techno-economic efficiency was preliminarily assessed. During the entire process, the effective utilization rates of calcium and sulfur, the main elements of phosphogypsum, were 92% and 88%, respectively. Additionally, the recycling efficiency of ammonia water reached 84%. Furthermore, the techno-economic benefit was preliminarily assessed. Each ton of raw PG treated by the integrated process would capture 0.23 t of CO<sub>2</sub> and yield economic benefit of 132 yuan, which has great advantages in industrial solid wastes with similar calcium content by direct wet mineralization. This integrated process offers a novel technological reference for current PG management and sulfuric acid manufacturing processes.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123707"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Ao, Xiaolin Liu, Xu Zhou, Guangyan Ran, Shengtian Yang, Wenling Yuan, Feng Hu
{"title":"Differential thresholds of net ecosystem productivity in karst and non-karst regions for identifying their potential carbon sinks areas.","authors":"Yang Ao, Xiaolin Liu, Xu Zhou, Guangyan Ran, Shengtian Yang, Wenling Yuan, Feng Hu","doi":"10.1016/j.jenvman.2024.123618","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123618","url":null,"abstract":"<p><p>Within ecosystems, habitat influences structure, and structure determines function, forming a habitat-structure-function framework (HSFF). Net ecosystem productivity (NEP) is a key indicator for assessing regional or global carbon dynamics. However, the response thresholds of NEP to habitat and structural factors, along with management strategies based on these thresholds, remain under-explored. Therefore, this study examines the response thresholds of NEP to habitat and structural factors in the karst and non-karst regions of southwest China, which exhibit strong surface heterogeneity, based on the HSFF using a restricted cubic spline method. The results are, (1) The interannual NEP increase rate and carbon storage per unit area were notably greater in karst regions than in non-karst ones. However, compared to non-karst regions, karst regions show greater NEP variability and lower stability. (2) Significant nonlinear relationships were identified between NEP and nine habitat factors and six structural factors. NEP thresholds due to habitat and structural factors were smaller in karst regions than in non-karst regions. (3) Habitat factors had greater relative importance and marginal contribution than structural factors in karst and non-karst regions, with energy and water as the main influences on NEP. (4) Using the potential carbon sinks areas determined by the threshold, the karst areas in the entire study will play an important role in carbon sinks in the future. Overall, this study not only deepens the understanding of the differences in ecosystem NEP between karst and non-karst regions, but also provides new perspectives and strategies for optimizing ecosystem management based on habitat and structural characteristics.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123618"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Metagenomics and metatranscriptomics insights into microbial enhancement of H<sub>2</sub>S removal and CO<sub>2</sub> assimilation.","authors":"Junjie Wang, Zhuowei Cheng, Yunfei Su, Jiade Wang, Dongzhi Chen, Jianmeng Chen, Xiaoming Wu, Aobo Chen, Zhenyu Gu","doi":"10.1016/j.jenvman.2024.123714","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123714","url":null,"abstract":"<p><p>This study focuses on the coupled process of bio-enhanced absorption and biodesulfurization for the toxic gas H<sub>2</sub>S and the greenhouse gas CO<sub>2</sub>. The results show that on the basis of stabilized absorption of H<sub>2</sub>S and CO<sub>2</sub> by alkaline solution (Stage I), the addition of air-lift bioreactor process solution in the absorption column enhanced their absorption (Stage II). Specifically, at constant inlet concentrations of H₂S and CO₂ of 3% (30,000 ppmv) and 30% (300,000 ppmv), respectively, the outlet gases were primarily H₂S, CO₂, and N₂. And the outlet H<sub>2</sub>S and CO<sub>2</sub> concentrations decreased from 10,038 ± 1166 ppmv and 49,897 ± 2545 ppmv in Stage I to 940 ± 163 ppmv and 21,000 ± 2165 ppmv in Stage II. S<sup>0</sup>-producing performance (348 ± 20-503 ± 23 mg S/L) and biomass concentration (467 ± 13-677 ± 55 mg/L) in the subsequent bioreactor also increased in response to the enhanced absorption of H<sub>2</sub>S and CO<sub>2</sub>. Biologically enhanced H<sub>2</sub>S and CO<sub>2</sub> absorption differs from physicochemical factors in that it depends on several physiological parameters such as microbial community composition and gene expression levels. In this study, the sulfur autotrophic denitrifying bacteria Thioalkalivibrio and Arenimonas had high abundance and activity (abundance: 69.5% and 21.1%, expression: 82.4% and 13.9%), and they were the main contributors to the bio-enhanced absorption of H<sub>2</sub>S and CO<sub>2</sub> in this system. In addition, the main factor for enhanced H<sub>2</sub>S absorption could be the high expression of sulfide:quinone oxidoreductase (SQR, encoding gene sqr) (45 ± 9 to 821 ± 102 transcripts per million). Enhanced CO<sub>2</sub> absorption could have been achieved by the oxidation of more H<sub>2</sub>S generating more energy to increase the carboxylation activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco, encoding genes rbcLS). Enhanced H<sub>2</sub>S absorption enhances CO<sub>2</sub> absorption and facilitates microbial growth, which in turn benefits the metabolism of H<sub>2</sub>S, creating a complementary biologically enhanced absorption. This study provides a novel strategy, demonstrating the potential of autotrophic sulfide-oxidizing microorganisms in the simultaneous removal of H₂S and assimilation of CO₂, and offers a deeper understanding of the underlying mechanisms.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123714"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Erica Marshall, Jessica L Keem, Trent D Penman, Julian Di Stefano
{"title":"Simulating fuel management for protecting regional biodiversity under climate change.","authors":"Erica Marshall, Jessica L Keem, Trent D Penman, Julian Di Stefano","doi":"10.1016/j.jenvman.2024.123731","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123731","url":null,"abstract":"<p><p>Climate change is resulting in larger, more frequent, and more severe wildfires which have increasingly negative impacts on people and the environment. Under these circumstances, it is critical to determine whether fire management actions can mitigate biodiversity impacts under future fire regimes. However, it is currently unclear how changing climate and management interact to influence the spatial distribution of risks to biodiversity. We used fire simulations to quantify the influence of 13 fuel management strategies on animal biodiversity in the Otways, southeastern Australia, under four alternative climate scenarios. Our management strategies include combinations of prescribed burning, mulching, and strategic fuel breaks modelled in various spatial configurations and frequencies. We assessed the capacity of treatments to reduce risk of fire to animal biodiversity by quantifying changes to extent burnt, wildfire frequency and wildfire severity. All management strategies reduced the average annual area burnt across the landscape, however, there was considerable variability over time and under different climate models. Similarly, spatial shifts in fire frequency and severity in some cases resulted in the shifting of fires away from some areas of high value to animals. There is no one size fits all management strategy for reducing impacts to biodiversity under variable future climates. However, all the strategies tested here reduced median impacts relative to a do-nothing approach for at least some aspects of the fire regime or for animal biodiversity. We highlight the importance of evaluating fire management effectiveness against a range of metrics to ensure multiple objectives are met under the increasingly unknown climate conditions we can expect going forward.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123731"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yifan Sun, Jian Sun, Zixuan Zhao, Zixuan Gao, Honghong Guo, Tao Hu, Lu An, Jie Gu, Xiaojuan Wang
{"title":"The addition of vermiculite reduced antibiotic resistance genes during composting: Novel insights based on reducing host bacteria abundance and inhibiting plasmid-mediated conjugative transfer.","authors":"Yifan Sun, Jian Sun, Zixuan Zhao, Zixuan Gao, Honghong Guo, Tao Hu, Lu An, Jie Gu, Xiaojuan Wang","doi":"10.1016/j.jenvman.2024.123719","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123719","url":null,"abstract":"<p><p>Antibiotic resistance genes (ARGs) are prevalent in raw materials used for composting. The utilization of eco-friendly materials for the removal of ARGs is regarded as an economically effective method. Therefore, this study focused on the impact of incorporating different proportions of vermiculite (0% (CK), 5% (T1), and 10% (T2)) on the dynamics of ARGs during composting. In comparison to CK, the total absolute abundances of ARGs decreased by 14.17% and 31.52% in T1 and T2, respectively. Potential human pathogenic bacteria, including Acinetobacter, Corynebacterium, and Lactobacillus, were identified as core hosts of ARGs. The addition of vermiculite effectively inhibited proliferation of ARG hosts by extending the thermophilic phase of composting and reducing bioavailable copper concentrations. Incorporation of vermiculite decreased the absolute abundances of transposons and integrons, such as intI1 and Tn916/1545, which were significantly positively correlated with most ARGs. Adding vermiculite simultaneously enhanced the removal of common environmental plasmids (e.g., Inc.P, Inc.W), and downregulated expression of genes associated with bacterial conjugation and plasmid replication (e.g., trBbp, trfAp), thereby inhibiting the dissemination of ARGs. Taken together, this study provides novel insights that the incorporation of vermiculite can effectively enhance the reduction rate of ARGs during composting by reducing the host of ARGs and inhibiting their dissemination.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123719"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuang Wang, Hongmei Shen, Hao Zhang, Muhammad Asif, Muhammad Farrukh Shahzad
{"title":"From greenwashing to genuine sustainability: Insights from FinTech and banking executives in emerging market experience.","authors":"Shuang Wang, Hongmei Shen, Hao Zhang, Muhammad Asif, Muhammad Farrukh Shahzad","doi":"10.1016/j.jenvman.2024.123690","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123690","url":null,"abstract":"<p><p>Greenwashing is the practice of deceiving stakeholders by making inflated or fraudulent promises about environmental responsibility. This study investigates greenwashing challenges in FinTech and banking industries, identifying effective strategies to foster genuine sustainability. The study employs a qualitative methodology, utilizing semi-structured interviews conducted with 12 respondents from the FinTech and banking sectors in Pakistan. This approach allows for an in-depth exploration of executives' perspectives on the transition from greenwashing to genuine sustainability practices, with data analyzed using thematic analysis through NVivo 14. The findings reveal significant challenges like stakeholder distrust, regulatory compliance issues, market confusion, misalignment of goals, competitive disadvantages, and reputational risk with effective strategies, including stakeholder engagement, third-party verification, collaboration, innovative technologies, internal training, and enhanced risk management. This study provides a comprehensive framework integrating challenges and strategies for combating greenwashing in FinTech and banking, offering new insights and practical solutions for fostering genuine sustainability in financial services.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123690"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N Dal Ferro, G Fabbri, F Gottardo, M Mencaroni, B Lazzaro, F Morari
{"title":"Identifying NH<sub>3</sub> emission mitigation techniques from farm to field using a Bayesian network.","authors":"N Dal Ferro, G Fabbri, F Gottardo, M Mencaroni, B Lazzaro, F Morari","doi":"10.1016/j.jenvman.2024.123636","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123636","url":null,"abstract":"<p><p>This study addresses the challenge of reducing ammonia (NH<sub>3</sub>) emissions from agriculture by evaluating various mitigation techniques. The research utilized a Bayesian Belief Network (BBN) to integrate quantitative data on NH<sub>3</sub> volatilization reduction with qualitative stakeholder perceptions, aiming to identify the best available techniques (BATs) that balance environmental, economic, and socio-cultural factors for farmers in the Veneto region of Italy. The BBN framework established probabilistic dependencies between variables related to livestock, crop type, manure storage, fertilization management, and pedo-climatic conditions. Stakeholder opinions were quantified through a value elicitation process and combined with the BBN to create an integrated Influence Diagram (ID). Results indicated that effective NH<sub>3</sub> reduction requires a comprehensive approach across the entire agri-livestock supply chain. Based on the results obtained, no single technique clearly emerged as the primary focus, rather various areas would require improvement across the agri-livestock supply chain. However, if prioritizing techniques were necessary, efforts should concentrate on stable management of infirmary animals (HC<sub>Inf</sub>), overcrowding reduction by decreasing the number of animals on densely populated farms (OC<sub>-Animal</sub>), and optimization of protein in animal ration (FD<sub>Prot</sub>). These measures should be combined with effective manure application through slurry injection (INJ<sub>Slu</sub>) in the field. Stakeholders showed reluctance towards more expensive or innovative methods, indicating that socio-cultural perceptions and economic feasibility can heavily influence the adoption of new technologies although they proved to be among the most environmentally effective. The primary insight from applying the BBNs was that selecting effective techniques necessitates a multi-perspective approach to foster consensus among stakeholders throughout the agri-livestock supply chain.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123636"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Liming-induced taxonomic homogenization of chironomid assemblages in Scandinavian lakes as unraveled by paleolimnological reconstructions.","authors":"Simon Belle, Stina Drakare, Johnson Richard K","doi":"10.1016/j.jenvman.2024.123546","DOIUrl":"https://doi.org/10.1016/j.jenvman.2024.123546","url":null,"abstract":"<p><p>In the 1980s, liming became a large-scale, governmentally supported restoration program implemented by many countries to mitigate the effects of acidification of freshwaters. Despite some 50 years of liming of thousands of lakes and streams, its efficacy remains largely debated. This study is the first of its kind to use paleolimnological reconstructions using both subfossil chironomid assemblages and their carbon stable isotopic composition to compare the ecological trajectories of limed and control (unlimed) lakes over the last 100 years in order to unravel the effects of liming on Scandinavian lakes. Our study revealed strong effects of liming on lake water chemistry and sedimentary characteristics of limed lakes. Overall, higher present-day pH values were observed in lake water of the limed lakes (average pH of 6.7 ± 0.2) than in control lakes (average pH of 5.9 ± 0.5), and the pH variability was much lower among limed lakes. A decrease in the dissimilarity of the chironomid assemblages among limed lakes was also observed as liming progressed, and the degree of dissimilarity after liming was largely lower than pre-acidified levels. This pattern suggests that liming favoured the selection of similar chironomid taxa in limed lakes, thus providing complementary empirical evidences about the effects of liming on aquatic communities through taxonomic homogenization of chironomid assemblages. As the ecological trajectories of limed and control lakes strongly differed, our study also questions the impact of liming on the resilience of Scandinavian lakes and, importantly, their ability to cope with ongoing and future climatic and environmental changes. Finally, isotope-based results indicated that liming masks potential complex effects on carbon flows at the base of the food web by shifting algal carbon isotopic baselines. The use of carbon stable isotope analysis of chironomid head capsules to study the effects of liming on energy flows within lake food webs is, therefore, not suitable.</p>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"373 ","pages":"123546"},"PeriodicalIF":8.0,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}