Pub Date : 2025-12-01Epub Date: 2025-10-26DOI: 10.1016/j.ecohyd.2025.100705
Delphine Nicolas , Baptiste Testi , Dušan Jesenšek , Kim Leban , Alain J. Crivelli
Temporal data series of water temperature collected at various locations in the Upper Soča river basin, a pristine area in Slovenia, from 1996 to 2022, were analyzed to assess any trends as potential effects of the global change. Different temperature metrics were calculated to study more especially eventual impacts on trout species known as present in the target sites: the endemic marble trout (Salmo marmoratus), the introduced common trout (Salmo trutta) and hybrid trout (S. marmoratus x S. trutta). Significant trends were observed in more than half of the streams considered, indicating a general warming of water temperatures across the entire Upper Soča basin. The high regional coherence found for streams in the three watersheds (Soča, Bača and Idrijca) studied suggested regional synchrony and an overall predominant climatic influence. However, a greater variation was observed in spring and summer, suggesting the implications of additional local factors. The majority of the monitored sites (n = 18 out of 25) experienced an increase in the annual mean temperature (+ 0.04 °C per year on average), especially in summer (+0.1 °C per year on average for 19 sites) when flows were lower. Thermal conditions remained favourable for salmonids in all sites. However, temperatures above 15 °C or even 19 °C are expected to be increasingly recorded, enhancing periods with stressful conditions for salmonids, at first for the endemic S. marmoratus.
研究人员分析了1996年至2022年在斯洛文尼亚原始地区上so a河流域不同地点收集的水温时序数据，以评估全球变化的潜在影响趋势。计算了不同的温度指标，以更具体地研究对目标地点已知的鳟鱼物种的最终影响：特有的大理石鳟鱼（Salmo marmoratus），引入的普通鳟鱼（Salmo trutta）和杂交鳟鱼（S. marmoratus x S. trutta）。在被考虑的河流中，有一半以上观察到明显的趋势，表明整个上so流域的水温普遍变暖。研究发现，三个流域（so a、ba a和Idrijca）的河流具有高度的区域一致性，这表明区域同步和总体上占主导地位的气候影响。然而，在春季和夏季观察到的变化更大，这表明其他当地因素的影响。大多数监测站点（25个站点中有18个站点）的年平均温度都有所上升（平均每年+ 0.04°C），特别是在流量较低的夏季（19个站点平均每年+0.1°C）。所有地点的热条件对鲑科鱼仍然有利。然而，预计将越来越多地记录到高于15°C甚至19°C的温度，这将增加鲑科鱼的压力期，首先是地方性的S. marmoratus。
{"title":"Effects of the global change on the thermal habitat quality for Salmonids within the Upper Soča watershed in Slovenia","authors":"Delphine Nicolas , Baptiste Testi , Dušan Jesenšek , Kim Leban , Alain J. Crivelli","doi":"10.1016/j.ecohyd.2025.100705","DOIUrl":"10.1016/j.ecohyd.2025.100705","url":null,"abstract":"<div><div>Temporal data series of water temperature collected at various locations in the Upper Soča river basin, a pristine area in Slovenia, from 1996 to 2022, were analyzed to assess any trends as potential effects of the global change. Different temperature metrics were calculated to study more especially eventual impacts on trout species known as present in the target sites: the endemic marble trout (<em>Salmo marmoratus</em>), the introduced common trout (<em>Salmo trutta</em>) and hybrid trout (<em>S. marmoratus x S. trutta</em>). Significant trends were observed in more than half of the streams considered, indicating a general warming of water temperatures across the entire Upper Soča basin. The high regional coherence found for streams in the three watersheds (Soča, Bača and Idrijca) studied suggested regional synchrony and an overall predominant climatic influence. However, a greater variation was observed in spring and summer, suggesting the implications of additional local factors. The majority of the monitored sites (<em>n</em> = 18 out of 25) experienced an increase in the annual mean temperature (+ 0.04 °C per year on average), especially in summer (+0.1 °C per year on average for 19 sites) when flows were lower. Thermal conditions remained favourable for salmonids in all sites. However, temperatures above 15 °C or even 19 °C are expected to be increasingly recorded, enhancing periods with stressful conditions for salmonids, at first for the endemic <em>S. marmoratus</em>.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100705"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-05-10DOI: 10.1016/j.ecohyd.2025.100666
Hailong Yu , Guangming Yu , Daman Yang , Fan Yu , Jing Guo , Yong Fan , Di Lu
Ecological water demand is an important aspect for the research of water supply-demand balance, which has a significant impact on regional ecological security and sustainable development. Although many ecological water demand models have been explored, a unified and complete regional ecological water demand model (REWD) has not yet been formed due to insufficient understanding of the connotation and composition of ecological water demand. Therefore, we redefine and clarify the composition of regional ecological water demand from the perspective of ecosystem division, and divide regional ecological water demand into biological water demand (BWD) and abiotic water demand (AWD). On this basis, a comprehensive regional ecological water demand model was constructed, which includes two major parts: the biological water demand model and the abiotic water demand model. The article applied the model to calculate and evaluate the ecological water demand in the Hanjiang River Basin (HRB), and estimated the ecological water-satisfied degree in the study area. The results show that, the range of ecological water demand in the study area is 481–2567,373 m3 /a, with the largest ecological water demand in the rivers and relatively small ecological water demand in the north-western region. The ecological water-satisfied degree in the HRB is basically above 100 percent, which is higher in the north-eastern and southern parts of the basin, and lower in the central and north-western areas. The integrated regional ecological water demand model is a unified and universal ecological water demand model, and the results can describe the spatial pattern of ecological water demand in a region and provide services for finer water resource regulation and allocation.
{"title":"Exploring a method for evaluating regional ecological water demand and its satisfaction degree: A case study of the Hanjiang River Basin, China","authors":"Hailong Yu , Guangming Yu , Daman Yang , Fan Yu , Jing Guo , Yong Fan , Di Lu","doi":"10.1016/j.ecohyd.2025.100666","DOIUrl":"10.1016/j.ecohyd.2025.100666","url":null,"abstract":"<div><div><span>Ecological water demand is an important aspect for the research of water supply-demand balance, which has a significant impact on regional ecological security and sustainable development. Although many ecological water demand models have been explored, a unified and complete regional ecological water demand model (REWD) has not yet been formed due to insufficient understanding of the connotation and composition of ecological water demand. Therefore, we redefine and clarify the composition of regional ecological water demand from the perspective of ecosystem division, and divide regional ecological water demand into biological water demand (BWD) and abiotic water demand (AWD). On this basis, a comprehensive regional ecological water demand model was constructed, which includes two major parts: the biological water demand model and the abiotic water demand model. The article applied the model to calculate and evaluate the ecological water demand in the Hanjiang River Basin (HRB), and estimated the ecological water-satisfied degree in the study area. The results show that, the range of ecological water demand in the study area is 481–2567,373 m</span><sup>3</sup><span> /a, with the largest ecological water demand in the rivers and relatively small ecological water demand in the north-western region. The ecological water-satisfied degree in the HRB is basically above 100 percent, which is higher in the north-eastern and southern parts of the basin, and lower in the central and north-western areas. The integrated regional ecological water demand model is a unified and universal ecological water demand model, and the results can describe the spatial pattern of ecological water demand in a region and provide services for finer water resource regulation and allocation.</span></div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100666"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-01-30DOI: 10.1016/j.ecohyd.2025.01.002
Marcin Stec , Aleksander Astel , Katarzyna Kamińska
The study aimed to seasonal monitoring of analgesic and anti-inflammatory drugs (AAID) in the wastewater influent and effluent. Samples were collected from the wastewater treatment plant (WWTP) in Słupsk for 12 months at two-week intervals. Analytes were extracted using solid phase extraction (SPE). Detection was carried out using the UHPLC-DAD system. Paracetamol (PARA), ibuprofen (IBU), ketoprofen (KET), diclofenac (DIC), naproxen (NPX), acetylsalicylic acid (ASA), and salicylic acid (SA) were detected in wastewater influent and effluent in the concentration range from 0.08 μg·L–1 to 30.59 μg·L–1. Determined concentrations were characterized by seasonal variability. The highest values were observed in the winter while the lowest in the summer. The removal efficiency (RE %) ranged from 76.1 % to > 99.9 % and was classified as high (> 70 %). The lowest average RE % was found for DIC (81.5 %), while the highest was for IBU (98.2 %). The most effective RE % was observed in the summer while the lowest was in the winter. An environmental risk assessment based on risk quotient (RQ) was accomplished to complement chemical analysis. Generally, the estimated RQeffl values for AAIDs released from WWTP in Słupsk were classified as low-risk for the environment (RQeffl < 0.1). However, in the case of fish embryos, a moderate risk was estimated for DIC, KET, and PARA.
{"title":"Occurrence and seasonal variability of analgesic and anti-inflammatory drugs (AAIDs) in the influent and effluent from WWTP in Słupsk (Poland)","authors":"Marcin Stec , Aleksander Astel , Katarzyna Kamińska","doi":"10.1016/j.ecohyd.2025.01.002","DOIUrl":"10.1016/j.ecohyd.2025.01.002","url":null,"abstract":"<div><div><span>The study aimed to seasonal monitoring of analgesic and anti-inflammatory drugs (AAID) in the wastewater influent and effluent. Samples were collected from the wastewater treatment plant<span><span><span><span><span> (WWTP) in Słupsk for 12 months at two-week intervals. Analytes were extracted using solid phase extraction<span> (SPE). Detection was carried out using the UHPLC-DAD system. Paracetamol (PARA), </span></span>ibuprofen (IBU), </span>ketoprofen (KET), diclofenac (DIC), </span>naproxen<span> (NPX), acetylsalicylic acid (ASA), and </span></span>salicylic acid (SA) were detected in wastewater influent and effluent in the concentration range from 0.08 μg·L</span></span><sup>–1</sup> to 30.59 μg·L<sup>–1</sup><span>. Determined concentrations were characterized by seasonal variability. The highest values were observed in the winter while the lowest in the summer. The removal efficiency (RE %) ranged from 76.1 % to > 99.9 % and was classified as high (> 70 %). The lowest average RE % was found for DIC (81.5 %), while the highest was for IBU (98.2 %). The most effective RE % was observed in the summer while the lowest was in the winter. An environmental risk assessment based on risk quotient (RQ) was accomplished to complement chemical analysis. Generally, the estimated RQ</span><sub>effl</sub> values for AAIDs released from WWTP in Słupsk were classified as low-risk for the environment (RQ<sub>effl</sub> < 0.1). However, in the case of fish embryos, a moderate risk was estimated for DIC, KET, and PARA.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100642"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-08-05DOI: 10.1016/j.ecohyd.2025.100682
Giovanna Orletti Del Rey, Luciano Soares da Cunha, Roberto Ventura Santos
Landfill leachate is a major source of water resource contamination, especially at sites without engineered liners. Its complex mix of organic and inorganic pollutants poses risks to human health and the environment. When aquifers fail to prevent contaminant migration, plumes form and typically attenuate with distance from the source. The stabilization stage of a landfill influences the isotopic composition of CO₂ produced during organic matter degradation, with δ¹³C signatures serving as effective tracers in aquifers. This study investigates contamination near the Jockey Club of Brasília landfill (JCBL), a 50-year-old decommissioned site in Brazil, using δ¹³C of dissolved inorganic carbon (δ¹³C-DIC) and complementary geochemical indicators. Leachate from JCBL is enriched in heavy carbon isotopes (δ¹³C ≈ +13 ‰), contrasting with δ¹³C-DIC values in local groundwater (∼−12 ‰). Isotopic mass balance suggests that approximately 48 % of the DIC in the shallow aquifer originates from leachate, a conservative estimate given possible effects of methane oxidation. Elevated Fe²⁺ levels also indicate redox-driven mobilization via Fe³⁺ reduction in Fe-rich oxisols. Surface water in the Cabeceira do Valo stream shows lower contaminant levels but cannot be deemed unaffected. The δ¹³C-DIC value in the stream (−9.64 ‰) is enriched relative to deep groundwater, suggesting partial leachate influence. Isotopic modeling estimates that ∼7.9 % of the stream’s DIC derives from leachate carbon, likely through subsurface discharge or mixing with impacted groundwater. These findings confirm the utility of δ¹³C-DIC as a tracer of landfill contamination and underscore the need for strategies to protect vulnerable water resources.
垃圾渗滤液是水资源污染的主要来源，特别是在没有工程衬垫的地方。其有机和无机污染物的复杂组合对人类健康和环境构成威胁。当含水层不能阻止污染物的迁移时，就会形成羽流，而且通常会随着距离污染源的远近而减弱。垃圾填埋场的稳定阶段影响有机质降解过程中产生的CO₂的同位素组成，δ¹³C特征在含水层中是有效的示踪剂。本研究利用溶解无机碳δ¹³C （δ¹³C- dic）和互补的地球化学指标，对巴西有50年历史的废弃填埋场Brasília赛马会附近的污染进行了调查。JCBL渗滤液富集重碳同位素（δ¹³C≈+13‰），与当地地下水δ¹³C- dic值（~−12‰）形成鲜明对比。同位素质量平衡表明，浅层含水层中大约48%的DIC来自渗滤液，这是考虑到可能受到甲烷氧化影响的保守估计。升高的Fe +水平也表明富铁氧化物中Fe +的还原是氧化还原驱动的动员。Cabeceira do Valo河流的地表水显示出较低的污染物水平，但不能认为未受影响。河流δ¹³C-DIC值（- 9.64‰）相对于深层地下水较为富集，提示部分渗滤液的影响。同位素模型估计，河流中约7.9%的DIC来自渗滤液碳，可能是通过地下排放或与受影响的地下水混合。这些发现证实了δ¹³C-DIC作为垃圾填埋场污染示踪剂的效用，并强调了保护脆弱水资源的策略的必要性。
{"title":"Carbon isotopic and geochemical insights into groundwater contamination by landfill leachate","authors":"Giovanna Orletti Del Rey, Luciano Soares da Cunha, Roberto Ventura Santos","doi":"10.1016/j.ecohyd.2025.100682","DOIUrl":"10.1016/j.ecohyd.2025.100682","url":null,"abstract":"<div><div>Landfill leachate is a major source of water resource contamination, especially at sites without engineered liners. Its complex mix of organic and inorganic pollutants poses risks to human health and the environment. When aquifers fail to prevent contaminant migration, plumes form and typically attenuate with distance from the source. The stabilization stage of a landfill influences the isotopic composition of CO₂ produced during organic matter degradation, with δ¹³C signatures serving as effective tracers in aquifers. This study investigates contamination near the Jockey Club of Brasília landfill (JCBL), a 50-year-old decommissioned site in Brazil, using δ¹³C of dissolved inorganic carbon (δ¹³C-DIC) and complementary geochemical indicators. Leachate from JCBL is enriched in heavy carbon isotopes (δ¹³<em>C</em> ≈ +13 ‰), contrasting with δ¹³C-DIC values in local groundwater (∼−12 ‰). Isotopic mass balance suggests that approximately 48 % of the DIC in the shallow aquifer originates from leachate, a conservative estimate given possible effects of methane oxidation. Elevated Fe²⁺ levels also indicate redox-driven mobilization via Fe³⁺ reduction in Fe-rich oxisols. Surface water in the Cabeceira do Valo stream shows lower contaminant levels but cannot be deemed unaffected. The δ¹³C-DIC value in the stream (−9.64 ‰) is enriched relative to deep groundwater, suggesting partial leachate influence. Isotopic modeling estimates that ∼7.9 % of the stream’s DIC derives from leachate carbon, likely through subsurface discharge or mixing with impacted groundwater. These findings confirm the utility of δ¹³C-DIC as a tracer of landfill contamination and underscore the need for strategies to protect vulnerable water resources.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100682"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-04-22DOI: 10.1016/j.ecohyd.2025.100661
Justyna Koc-Jurczyk, Łukasz Jurczyk, Agnieszka Podolak, Aleksandra Pasek, Michał Dyka
Landfill leachate (LL) is one of the main environmental threats of waste landfilling, therefore it is crucial to effectively dispose before discharged into a receiver body. To increase the treatment efficiency of LL from landfills operated for >10 years, physicochemical methods, such as Advanced Oxidation Process (AOP), are recommended. There are numerous data on the harmful effects of LL on representatives of successive trophic levels, but still insufficient in the case of products of various technologies of treatment and inflow characteristics. Phytotoxicity tests concern different stages of plant development, and they are most often based on the seed germination degree and root growth rate. This study aimed to assess changes in the biodegradability of organics in products of LL treatment by advanced oxidation with oxygen peroxide with Fenton's reagent, and further, their effect against a popular model organism in ecotoxicology - Lepidium sativum (garden cress). The following variants of the reagent ratios (Fe2+:H2O2): 1:1, 1:2 and 1:3 were tested for organic compounds removal. The efficiency of COD removal ranged from 13.3 to 36.5 %, whereas BOD5/COD ratio increased from 0.11 up to 0.42 in the most optimal variant. Both, products of treatment and raw leachate (RL) inhibited the growth of plants, however, chemical oxidation significantly increased toxicity. Based on EC50 (median effective concentration), the mixtures were ordered from the most to the least toxic: 32.90 % (1:2), 34.10 % (1:1), 39.29 % (1:3), 92.52 % (RL), and according to IC50 (median inhibitory concentration) as follow: 1:3 - 11.73 %, 1:2 - 11.99 %, 1:1 - 12.60 %, RL - 48.18 %.
{"title":"Phytotoxicity of products of selected technological variants of chemical oxidation of leachates from municipal waste landfills","authors":"Justyna Koc-Jurczyk, Łukasz Jurczyk, Agnieszka Podolak, Aleksandra Pasek, Michał Dyka","doi":"10.1016/j.ecohyd.2025.100661","DOIUrl":"10.1016/j.ecohyd.2025.100661","url":null,"abstract":"<div><div><span><span><span>Landfill leachate (LL) is one of the main environmental threats of waste landfilling, therefore it is crucial to effectively dispose before discharged into a receiver body. To increase the treatment efficiency of LL from landfills operated for >10 years, physicochemical methods, such as Advanced </span>Oxidation<span> Process (AOP), are recommended. There are numerous data on the harmful effects of LL on representatives of successive trophic levels, but still insufficient in the case of products of various technologies of treatment and inflow characteristics. </span></span>Phytotoxicity<span> tests concern different stages of plant development, and they are most often based on the seed germination<span><span> degree and root growth<span> rate. This study aimed to assess changes in the biodegradability<span> of organics in products of LL treatment by advanced oxidation with oxygen peroxide with </span></span></span>Fenton's reagent<span>, and further, their effect against a popular model organism in ecotoxicology - </span></span></span></span><span><em>Lepidium</em><em> sativum</em></span> (garden cress). The following variants of the reagent ratios (Fe<sup>2+</sup>:H<sub>2</sub>O<sub>2</sub><span>): 1:1, 1:2 and 1:3 were tested for organic compounds removal. The efficiency of COD removal ranged from 13.3 to 36.5 %, whereas BOD</span><sub>5</sub>/COD ratio increased from 0.11 up to 0.42 in the most optimal variant. Both, products of treatment and raw leachate (RL) inhibited the growth of plants, however, chemical oxidation significantly increased toxicity. Based on EC<sub>50</sub> (median effective concentration), the mixtures were ordered from the most to the least toxic: 32.90 % (1:2), 34.10 % (1:1), 39.29 % (1:3), 92.52 % (RL), and according to IC<sub>50</sub> (median inhibitory concentration) as follow: 1:3 - 11.73 %, 1:2 - 11.99 %, 1:1 - 12.60 %, RL - 48.18 %.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100661"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-07-17DOI: 10.1016/j.ecohyd.2025.100681
Mariola Krodkiewska , Aneta Spyra , Adrianna Koczorowska , Bartosz Łozowski , Robert Czerniawski , Łukasz Sługocki , Marcin Libera , Andrzej Woźnica , Damian Absalon , Magdalena Matysik , Małgorzata Bąk , Edyta Sierka , Dariusz Halabowski , Anna Cieplok
Along with ongoing climate change, large rivers have experienced dramatic changes in conditions over time, subjected to multiple pressures and disturbances. A study on aquatic invertebrate linear diversity was conducted along the entire course of the large European Vistula River in Poland. The study aimed to evaluate which environmental variables are most important in determining diversity and variation in benthic communities from the upper to the lower parts of the river. A total of 39 macroinvertebrate taxa were recorded. Macroinvertebrate densities varied greatly, ranging from 93 to 19,200 individuals/m2. Fourteen alien invertebrate species were identified, including oligochaetes (Branchiura sowerbyi), polychaetes (Leonome xeprovala), crustaceans (Chelicorophium curvispinum, Gyraulus tigrinus, Dikerogammarus villosus, Orconectes limosus), gastropods (Potamopyrgus antipodarum, Ferrissia wautieri, Physa acuta, Lithoglyphus naticoides), and bivalves (Dreissena polymorpha, Rangia cuneata, Corbicula fluminea, Sinanodonta woodiana). The proportion of alien species ranged from 0 % to over 99 %. Canonical Correspondence Analysis (CCA) revealed that conductivity, turbidity, pH, dissolved organic matter (DOM), and water oxygen content best explained the variation in the distribution of macroinvertebrate taxa in the Vistula River. Nereidae, Tatetidae, and Gammaridae were associated with high conductivity. In contrast, Gomphidae, Cyrenidae, Caenidae, and Ceratopogonidae were more abundant in well-oxygenated waters with higher turbidity. Some mollusk taxa (Viviparidae, Sphaeriidae, Dreissenidae, and Bithyniidae) were linked to higher levels of DOM. Our results support the conclusion that changing patterns in invertebrate composition along the course of large rivers reflect longitudinal changes in environmental pressures and conditions, providing valuable insight for evaluating changing climate and development.
{"title":"Exploring a large European river: Unraveling the spatial distribution and diversity of benthic invertebrates along the Vistula River (Poland)","authors":"Mariola Krodkiewska , Aneta Spyra , Adrianna Koczorowska , Bartosz Łozowski , Robert Czerniawski , Łukasz Sługocki , Marcin Libera , Andrzej Woźnica , Damian Absalon , Magdalena Matysik , Małgorzata Bąk , Edyta Sierka , Dariusz Halabowski , Anna Cieplok","doi":"10.1016/j.ecohyd.2025.100681","DOIUrl":"10.1016/j.ecohyd.2025.100681","url":null,"abstract":"<div><div>Along with ongoing climate change, large rivers have experienced dramatic changes in conditions over time, subjected to multiple pressures and disturbances. A study on aquatic invertebrate linear diversity was conducted along the entire course of the large European Vistula River in Poland. The study aimed to evaluate which environmental variables are most important in determining diversity and variation in benthic communities from the upper to the lower parts of the river. A total of 39 macroinvertebrate taxa were recorded. Macroinvertebrate densities varied greatly, ranging from 93 to 19,200 individuals/m<sup>2</sup>. Fourteen alien invertebrate species were identified, including oligochaetes (<em>Branchiura sowerbyi</em>), polychaetes (<em>Leonome xeprovala</em>), crustaceans (<em>Chelicorophium curvispinum, Gyraulus tigrinus, Dikerogammarus villosus, Orconectes limosus</em>), gastropods (<em>Potamopyrgus antipodarum, Ferrissia wautieri, Physa acuta, Lithoglyphus naticoides),</em> and bivalves (<em>Dreissena polymorpha, Rangia cuneata, Corbicula fluminea, Sinanodonta woodiana)</em>. The proportion of alien species ranged from 0 % to over 99 %. Canonical Correspondence Analysis (CCA) revealed that conductivity, turbidity, pH, dissolved organic matter (DOM), and water oxygen content best explained the variation in the distribution of macroinvertebrate taxa in the Vistula River. Nereidae, Tatetidae, and Gammaridae were associated with high conductivity. In contrast, Gomphidae, Cyrenidae, Caenidae, and Ceratopogonidae were more abundant in well-oxygenated waters with higher turbidity. Some mollusk taxa (Viviparidae, Sphaeriidae, Dreissenidae, and Bithyniidae) were linked to higher levels of DOM. Our results support the conclusion that changing patterns in invertebrate composition along the course of large rivers reflect longitudinal changes in environmental pressures and conditions, providing valuable insight for evaluating changing climate and development.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100681"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-09-24DOI: 10.1016/j.ecohyd.2025.100695
Chunhui Xiong , Chuqian Lu , Houlei Jia , Tao Liu , Zhenxiong Yang , Wei Deng , Zhiming Guo , Yinghua Huang , Yuhong Zhong , Tuanjie Li
Beta diversity (β) refers to the spatial variation in species composition, and understanding its patterns and the driving factors is crucial for comprehending biodiversity. To accurately analyze the factors influencing the maintenance of phytoplankton β diversity in the Pearl River Estuary (PRE), we employed Generalized Dissimilarity Modeling (GDM) to assess the relative importance of environmental and spatial processes. Our findings indicated that both environmental selection and spatial processes shape β diversity, with environmental selection exerting a predominant influence in the PRE. The spatial heterogeneity of phytoplankton in the PRE is affected by both natural and anthropogenic factors. Salinity is the primary driver, followed by transparency, suspended solids, and nutrients. As a distance-based nonlinear regression method, GDM effectively identified community variation of phytoplankton along environmental and spatial gradients. This study provides valuable insights for policy-making and management decisions by the relevant administrative bodies within the PRE.
{"title":"Impact of environmental selection on spatial heterogeneity of summer phytoplankton community in Pearl River Estuary, China","authors":"Chunhui Xiong , Chuqian Lu , Houlei Jia , Tao Liu , Zhenxiong Yang , Wei Deng , Zhiming Guo , Yinghua Huang , Yuhong Zhong , Tuanjie Li","doi":"10.1016/j.ecohyd.2025.100695","DOIUrl":"10.1016/j.ecohyd.2025.100695","url":null,"abstract":"<div><div>Beta diversity (<em>β</em>) refers to the spatial variation in species composition, and understanding its patterns and the driving factors is crucial for comprehending biodiversity. To accurately analyze the factors influencing the maintenance of phytoplankton <em>β</em> diversity in the Pearl River Estuary (PRE), we employed Generalized Dissimilarity Modeling (GDM) to assess the relative importance of environmental and spatial processes. Our findings indicated that both environmental selection and spatial processes shape <em>β</em> diversity, with environmental selection exerting a predominant influence in the PRE. The spatial heterogeneity of phytoplankton in the PRE is affected by both natural and anthropogenic factors. Salinity is the primary driver, followed by transparency, suspended solids, and nutrients. As a distance-based nonlinear regression method, GDM effectively identified community variation of phytoplankton along environmental and spatial gradients. This study provides valuable insights for policy-making and management decisions by the relevant administrative bodies within the PRE.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100695"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
The ecohydrological consequences of dam sediment flushing remain poorly understood, particularly in lowland rivers and coastal systems. This study investigates the long-term impacts of uncontrolled flushing operations from the Manjil Dam on the downstream Sefidrud River and the ecologically sensitive Kiashahr and Zibakenar lagoons along the southern Caspian Sea. Using hydrochemical analyses, sediment core data, and satellite-derived indices of turbidity and eutrophication, we demonstrate that sediment flushing significantly altered riverine and lagoonal processes. Flushing-induced sediment discharge peaked at 8.3 times that of non-flushing days, raising suspended sediment concentrations above ecologically critical thresholds. These pulses led to widespread mass fish mortality and the degradation of benthic communities. Hydrochemical signatures shifted markedly, with elevated total dissolved solids, salinity, and ion concentrations, particularly Na⁺, Cl⁻, driven by evaporite dissolution and sediment remobilization. Remote sensing revealed a strong correlation between riverine turbidity and chlorophyll-a concentrations, evidencing enhanced eutrophication in the lagoons. Sediment core analysis confirmed long-term ecological degradation through the disappearance of charophytes and benthic foraminifera and the formation of azoic layers. Flushing disrupted natural flow regimes, shortened low-flow periods, and altered estuarine morphology. Despite rising Caspian Sea levels, accelerated sedimentation led to a 91 % and 32 % reduction in the area of Kiashahr and Zibakenar lagoons, respectively. A large portion of flushed sediments settled in the riverbed, elevating downstream suspended sediment concentration above upstream levels during non-flushing days, prolonging biotic stress. These findings reveal the lasting ecohydrological impacts of sediment flushing, highlighting its role in degrading the health and biodiversity of the freshwater-to-coastal continuum.
{"title":"Ecohydrological impacts of Manjil Dam flushing on the downstream Sefidrud River and two coastal lagoons of the Southern Caspian Sea","authors":"Saeed Poorasadollah , Ziaoddin Shoaei , Mohsen Shariat Jafari , Ali Sorbi","doi":"10.1016/j.ecohyd.2025.100680","DOIUrl":"10.1016/j.ecohyd.2025.100680","url":null,"abstract":"<div><div>The ecohydrological consequences of dam sediment flushing remain poorly understood, particularly in lowland rivers and coastal systems. This study investigates the long-term impacts of uncontrolled flushing operations from the Manjil Dam on the downstream Sefidrud River and the ecologically sensitive Kiashahr and Zibakenar lagoons along the southern Caspian Sea. Using hydrochemical analyses, sediment core data, and satellite-derived indices of turbidity and eutrophication, we demonstrate that sediment flushing significantly altered riverine and lagoonal processes. Flushing-induced sediment discharge peaked at 8.3 times that of non-flushing days, raising suspended sediment concentrations above ecologically critical thresholds. These pulses led to widespread mass fish mortality and the degradation of benthic communities. Hydrochemical signatures shifted markedly, with elevated total dissolved solids, salinity, and ion concentrations, particularly Na⁺, Cl⁻, driven by evaporite dissolution and sediment remobilization. Remote sensing revealed a strong correlation between riverine turbidity and chlorophyll-a concentrations, evidencing enhanced eutrophication in the lagoons. Sediment core analysis confirmed long-term ecological degradation through the disappearance of charophytes and benthic foraminifera and the formation of azoic layers. Flushing disrupted natural flow regimes, shortened low-flow periods, and altered estuarine morphology. Despite rising Caspian Sea levels, accelerated sedimentation led to a 91 % and 32 % reduction in the area of Kiashahr and Zibakenar lagoons, respectively. A large portion of flushed sediments settled in the riverbed, elevating downstream suspended sediment concentration above upstream levels during non-flushing days, prolonging biotic stress. These findings reveal the lasting ecohydrological impacts of sediment flushing, highlighting its role in degrading the health and biodiversity of the freshwater-to-coastal continuum.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100680"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-09-24DOI: 10.1016/j.ecohyd.2025.100696
Yongkang Ding , Jianwei Sun , Hao Zhao , Zhirui Wang , Yanzhi Jin
The Aksu River Basin in the arid southern Xinjiang of China has a fragile ecosystem. Groundwater is one of the key factors restricting the growth and development of surface vegetation in arid areas. Quantitatively analyzing the relationship between groundwater depth affected by natural and anthropogenic factors and vegetation coverage is crucial for ecosystem security. This study selects the MOD13Q1 data and the groundwater depth data during the vegetation growing season (from May to September) from 2015 to 2020. Through linear analysis and the Geodetector model (GDM), this study quantitatively analyzed the response relationships among vegetation cover, land desertification, and groundwater depth. Using the GDM, it quantified the influence of 12 driving factors on the NDVI (Normalized Difference Vegetation Index). Additionally, it clarified the driving force behind the vegetation NDVI and its key factors, as well as the optimal range and type of factors conducive to vegetation growth, providing references and bases for ecological protection and sustainable development. Our study has demonstrated that: (1) Vegetation NDVI was most sensitive to groundwater depths of 2∼8 m. (2) Groundwater depths < 5 m increased vegetation cover, while depths > 8 m led to stable desertification levels. (3) The main factors affecting NDVI were land use type, soil moisture, and groundwater depth. (4) Factor interactions were primarily nonlinear, with land use and soil moisture having the strongest interaction. The optimal groundwater depth range for vegetation growth was 2.3∼4.2 m.
{"title":"Research on the relationship between vegetation coverage and groundwater depth in the Aksu River Basin, China","authors":"Yongkang Ding , Jianwei Sun , Hao Zhao , Zhirui Wang , Yanzhi Jin","doi":"10.1016/j.ecohyd.2025.100696","DOIUrl":"10.1016/j.ecohyd.2025.100696","url":null,"abstract":"<div><div>The Aksu River Basin in the arid southern Xinjiang of China has a fragile ecosystem. Groundwater is one of the key factors restricting the growth and development of surface vegetation in arid areas. Quantitatively analyzing the relationship between groundwater depth affected by natural and anthropogenic factors and vegetation coverage is crucial for ecosystem security. This study selects the MOD13Q1 data and the groundwater depth data during the vegetation growing season (from May to September) from 2015 to 2020. Through linear analysis and the Geodetector model (GDM), this study quantitatively analyzed the response relationships among vegetation cover, land desertification, and groundwater depth. Using the GDM, it quantified the influence of 12 driving factors on the NDVI (Normalized Difference Vegetation Index). Additionally, it clarified the driving force behind the vegetation NDVI and its key factors, as well as the optimal range and type of factors conducive to vegetation growth, providing references and bases for ecological protection and sustainable development. Our study has demonstrated that: (1) Vegetation NDVI was most sensitive to groundwater depths of 2∼8 m. (2) Groundwater depths < 5 m increased vegetation cover, while depths > 8 m led to stable desertification levels. (3) The main factors affecting NDVI were land use type, soil moisture, and groundwater depth. (4) Factor interactions were primarily nonlinear, with land use and soil moisture having the strongest interaction. The optimal groundwater depth range for vegetation growth was 2.3∼4.2 m.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100696"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2025-12-01Epub Date: 2025-08-05DOI: 10.1016/j.ecohyd.2025.100687
Ripan Ghosh, Somnath Saha, Manashi Haldar, Sandipta Debanshi, Swades Pal
Hydrologically irregular, shallower wetlands particularly in isolated oxbow lakes are frequently overlooked due to their low provisioning services neglecting their role towards regulating services. The present study aimed to explore how hydrological condition of oxbow lakes in Diara floodplain of Ganges plain controls carbon sequestration. Both remote sensing and field data were taken for this. Water presence frequency (WPF), hydro-period (HP) and water depth (WD) were taken for developing analytical hierarchy process (AHP)-based weighted water richness (WR) model of from 1991 to 2023. Carbon sequestration was estimated using spectral vegetation index (Normalized difference vegetation index (NDVI)) and field-driven biomass coupled regression. Association between WR and Carbon (C) sequestration was done using correlation and Ordinary least square (OLS) regression approach. Study revealed significant areal shrinkage and seasonal dynamics in hydrological condition. WR model exhibited about 50 % drop area under good WR zone. Total estimated C sequestration potentiality is 1.3 × 10*3 Mg and 1.1 × 10*3 Mg in the cycle I and II with higher in winter and summer seasons. Association between predicted WR and C sequestration reported that low WR condition is more potential for C sequestration due to higher growth of vegetation. These findings indicate that hydrologically poorer wetlands are ambient for vegetation growth which makes it an effective sink of carbon and therefore should be also be preserved amid climate change scenario. For instance, good WR area could be focused for livelihood supporting fishing and poor WR area could be used for carbon sink.
{"title":"Modeling hydrological conditions of oxbow lakes and assessing its effect on carbon sequestration in Diara Ganges plain","authors":"Ripan Ghosh, Somnath Saha, Manashi Haldar, Sandipta Debanshi, Swades Pal","doi":"10.1016/j.ecohyd.2025.100687","DOIUrl":"10.1016/j.ecohyd.2025.100687","url":null,"abstract":"<div><div>Hydrologically irregular, shallower wetlands particularly in isolated oxbow lakes are frequently overlooked due to their low provisioning services neglecting their role towards regulating services. The present study aimed to explore how hydrological condition of oxbow lakes in Diara floodplain of Ganges plain controls carbon sequestration. Both remote sensing and field data were taken for this. Water presence frequency (WPF), hydro-period (HP) and water depth (WD) were taken for developing analytical hierarchy process (AHP)-based weighted water richness (WR) model of from 1991 to 2023. Carbon sequestration was estimated using spectral vegetation index (Normalized difference vegetation index (NDVI)) and field-driven biomass coupled regression. Association between WR and Carbon (C) sequestration was done using correlation and Ordinary least square (OLS) regression approach. Study revealed significant areal shrinkage and seasonal dynamics in hydrological condition. WR model exhibited about 50 % drop area under good WR zone. Total estimated C sequestration potentiality is 1.3 × 10*<sup>3</sup> Mg and 1.1 × 10*<sup>3</sup> Mg in the cycle I and II with higher in winter and summer seasons. Association between predicted WR and C sequestration reported that low WR condition is more potential for C sequestration due to higher growth of vegetation. These findings indicate that hydrologically poorer wetlands are ambient for vegetation growth which makes it an effective sink of carbon and therefore should be also be preserved amid climate change scenario. For instance, good WR area could be focused for livelihood supporting fishing and poor WR area could be used for carbon sink.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100687"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
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