Lakes and Reservoirs: Research and Management最新文献

{"title":"Population, Growth and Other Characteristics of Chrysichthys nigrodigitatus (Lacépède, 1803) (Pisces: Claroteidae) From Bui Reservoir, Ghana","authors":"Theodore Quarcoopome,&nbsp;Divine Worlanyo Hotor,&nbsp;Acheampong Addo,&nbsp;Ruby Asmah","doi":"10.1111/lre.70013","DOIUrl":"https://doi.org/10.1111/lre.70013","url":null,"abstract":"<div>\u0000 \u0000 <p>After five years of impoundment, Bui Reservoir fisheries has evolved with silver catfish, <i>Chrysichthys nigrodigitatus</i> among the most important commercial species. Based on standard length analyses of 162 individuals (62 males, 39 females) from post-impoundment seasonal sampling at three (3) stations, the population structure, well-being, growth type, sex ratio, length at first capture and rates of growth, mortality, exploitation, and other derived parameters of <i>C. nigrodigitatus</i> were estimated to provide requisite information for sustainable management. The population is composed of fewer juveniles and more males than females, with females relatively larger than males (modal size 7.0–7.9 for males and 9.0–9.9 for females). Females were physiologically better than males (79.49% of females had condition factor above 2.0 compared to 53.23% males) notwithstanding seasonal fluctuations. Unimodal length structure was observed for all seasons except for the post-rainy season with 2 modes, all of which, however, indicated a single year class and single spawning. Estimated hypoallometric and hyperallometric growth values among seasons and sexes were not significantly different from the isometric pattern. Estimated von Bertalanffy growth parameters were asymptotic size (<i>L</i>_∞) = 13.07 cm SL, growth constant (<i>K</i>) = 1.01 year,⁻¹ and length at time 0 (<i>t</i>_o) = 0.18. Growth performance index (<i>ϕ</i>') was 2.27, indicating slow growth while the lifespan was 2.73 years. Total mortality, natural mortality, and fishing mortality estimates were high (3.56, 2.44 and 1.12 respectively) while exploitation was below optimum (<i>E</i> = 0.32). Regular assessment of fish population, growth, and other characteristics is recommended to provide requisite information for strategic interventions for sustainable management and development of reservoir fisheries.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Short Review of the Life of Major Existing Dams in India","authors":"Shobhit Maheshwari","doi":"10.1111/lre.70019","DOIUrl":"https://doi.org/10.1111/lre.70019","url":null,"abstract":"<div>\u0000 \u0000 <p>This study examines the current state and projected future of India's dams, focusing on the challenges posed by ageing infrastructure, sedimentation, increasing water demands and climate change. With over half of India's major dams now surpassing 50 years of age, the risk of structural deterioration and reduced functionality is escalating. Sedimentation, a critical issue, has led to a substantial decrease in reservoir storage capacity, impacting water availability for agriculture, drinking water and hydropower generation. Additionally, climate change is anticipated to intensify these challenges, with more frequent and severe weather events stressing dams that were not originally designed for such variability. To ensure the longevity and resilience of these structures, comprehensive adaptation measures are essential. Key recommendations include modernising dam infrastructure, implementing advanced sediment management strategies, integrating climate-responsive design features and enhancing real-time monitoring systems. Future research should prioritise climate modelling, innovative sediment control and seismic resilience improvements. Proactive policy, combined with sustained funding and community engagement, is vital to safeguarding India's water resources and addressing the complexities of an evolving environmental landscape.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144574008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GIS-Based Aquaculture Spatial Suitability in Western Amazonian Hydroelectric Reservoirs","authors":"Carlos Eduardo Mounic-Silva,&nbsp;Flávio Boscatto,&nbsp;Julia Cucco Dalri,&nbsp;Marco Antônio Polli,&nbsp;Flávia Tavares Mattos,&nbsp;Emanuela Rodrigues Meneghetti,&nbsp;Raica Esteves Xavier Meante,&nbsp;Celso Carlos Buglione-Neto,&nbsp;Alex Pires De Oliveira Nuñer","doi":"10.1111/lre.70016","DOIUrl":"https://doi.org/10.1111/lre.70016","url":null,"abstract":"<p>This study applies a GIS-based approach to evaluate the spatial suitability of net-cage aquaculture and analyse key water quality parameters in four hydroelectric reservoirs located in the Jamari River basin, Western Brazilian Amazon. The assessment includes one large hydropower reservoir (HPP Samuel) and three small hydropower reservoirs (SHDs): SC Monte Negro, Jamari and Canaã. The methodology followed five stages: (1) temporal analysis of Total Water Surface Area (TWSA); (2) identification of vegetation-free areas; (3) evaluation of depth suitability; (4) compilation of historical water level data and limnological parameters (chlorophyll-<i>a</i>, BOD, total phosphorus, dissolved oxygen); and (5) mapping and estimation of Potential Aquaculture Sites (PAS). Due to excessive seasonal variation (&gt; 70% fluctuation in TWSA), the Samuel HPP reservoir was excluded from the final suitability mapping. In contrast, the SHD reservoirs exhibited environmental stability and fulfilled legal requirements for net-cage installation. Together, they offer an estimated production potential of up to 466 t per year using native species such as <i>Colossoma macropomum</i>. Most water quality parameters complied with Brazilian environmental standards (CONAMA Resolution no. 357/2005). This spatial and limnological assessment provides a technical foundation for implementing sustainable aquaculture systems in Amazonian hydroelectric reservoirs. Further studies should incorporate ecological carrying capacity modelling and environmental impact projections to support long-term sustainable aquaculture practices in these freshwater ecosystems.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/lre.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Demography of Two Fishes Xenentodon cancila (Hamilton, 1822) and Hyporhamphus limbatus (Valenciennes, 1847) From Ujani Reservoir (Maharashtra, India) Facing Multiple Threats","authors":"Ranjit More,&nbsp;Jiwan Sarwade,&nbsp;Vinod Kakade,&nbsp;Omkar Daripkar,&nbsp;Govind Giri,&nbsp;Ganesh Markad","doi":"10.1111/lre.70017","DOIUrl":"https://doi.org/10.1111/lre.70017","url":null,"abstract":"<div>\u0000 \u0000 <p>The species representing minor fisheries are gaining more economic importance as fishing pressure is increasing on major riverine fishes. Population characteristics or demographic studies of minor fishery resources can provide insight into the impact of environmental issues, conservation status, and help in the management and development of fisheries. We studied the population dynamics of two commercially significant fishes, freshwater garfish, <i>Xenentodon cancila</i> and Cangaturi halfbeak, <i>Hyporhampus limbatus</i>, from Ujani water reservoir (Pune, India) using cast net and gill net on a monthly basis for 1 year. Length-weight relationship (LWR) and population dynamics of both fishes were analysed using FAO-ICLARM Stock Assessment Tool (FISAT). LWR analysis revealed a positive allometric growth pattern in both <i>X. cancila</i> (<i>b</i> = 3.12) and <i>H. limbatus</i> (<i>b</i> = 3.15). The estimated potential longevity (<i>t</i>_max) of <i>X. cancila</i> and <i>H. limbatus</i> was 3.48 and 5.76 years, respectively. The observed length at first capture for <i>X. cancila</i> and <i>H. limbatus</i> was 18.53 and 6.66 cm, respectively. Juveniles of <i>H. limbatus</i> face higher exploitation as compared to <i>X. cancila</i>. Higher natural mortality was observed in <i>X. cancila</i> while fishing mortality was higher in <i>H. limbatus</i>. Recruitment analysis revealed two spawning bouts in 1 year for both species. <i>Xenentodon cancila</i> fish stock is under-exploited and <i>H. limbatus</i> fish stock is over-exploited in Ujani reservoir. Further reproductive biology studies are necessary for the effective development and management of fisheries involving <i>X. cancila</i> and <i>H. limbatus</i>.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the Length-Weight Relationships and Growth Patterns of Seven Catfish Species in the Middle Stretch of the River Ganga, India: Insights for Sustainable Fisheries Management and Conservation Perspectives","authors":"Rajesh Jayaswal,&nbsp;Durgesh Kumar Verma,&nbsp;Sanatan Paul,&nbsp;Absar Alam,&nbsp;Dharm Nath Jha,&nbsp;Basanta Kumar Das,&nbsp;Canciyal Johnson","doi":"10.1111/lre.70018","DOIUrl":"https://doi.org/10.1111/lre.70018","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, length-weight relationships of seven catfish species collected from the middle stretch of the Ganga River in India were determined. The specimens were gathered from the Sadiyapur and Daraganj fish landing centers in this region of the Ganga River between November 2022 and October 2023. Digital callipers and digital balances were utilised to measure the total length (TL) and body weight (BW) of all fish specimens. The growth coefficient <i>b</i> ranged from 1.98 for <i>Sperata aor</i> to 3.31 for <i>Sperata seenghala</i>. Also, <i>Rita rita</i>, <i>Sperata aor</i>, <i>Eutropiichthys vacha</i>, <i>Wallago attu</i> and <i>Bagarius bagarius</i> exhibited negative allometric growth (<i>b</i> &lt; 3) while <i>Sperata seengala</i> and <i>Clupisoma garua</i> showed positive allometric growth (<i>b</i> &gt; 3). The coefficient of determination (<i>R</i>²) values ranged from 0.66 to 0.93 across the seven catfish species. Additionally, the relative condition factor (<i>K</i>_<i>n</i>) value is greater than 1 for all the catfish species, indicating that all the catfish species are in good health.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144503138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fish Biodiversity as a Biological Indicator of Aquatic Environmental Quality in Wetlands of Lake Tana, Ethiopia","authors":"Hailu Mazengia,&nbsp;Horst Kaiser,&nbsp;Minwyelet Mingist","doi":"10.1111/lre.70014","DOIUrl":"https://doi.org/10.1111/lre.70014","url":null,"abstract":"<div>\u0000 \u0000 <p>Fish biodiversity was assessed as a biological indicator of aquatic environmental quality across six wetlands of Lake Tana, Ethiopia. A total of 1616 fish specimens, representing 18 species, four genera and three families, were collected. <i>Labeobarbus intermedius</i> (23.1%–48.9%) and <i>L. brevicephalus</i> (6.7%–44.4%) were the most abundant, whereas <i>L. beso</i>, <i>L. gorguari</i> and <i>L. truttiformis</i> were least common (0%–6.7%). Spatially, <i>Clarias gariepinus</i> dominated at Megech River Mouth (9.4%), and <i>Oreochromis niloticus</i> was abundant at Wonjeta (54.5%) and Ras Abbay (62.5%). Catch Per Unit Effort (CPUE) ranged from below the detection limit to 110.0 fish/h. The Fish Index of Biotic Integrity (FIBI) and Habitat Quality Index (HQI) varied significantly, with the highest FIBI values at Gumara and Megech River Mouths (39.0) and HQI scores peaking at Zewdie Girar (19.0) and Wonjeta (18.5). Multivariate analyses grouped wetlands into three distinct clusters based on the fish assemblage structure: Cluster 1 (Wonjeta, Ras Abbay and Avaj), Cluster 2 (Zewdie Girar and Gumara River Mouth) and Cluster 3 (Megech River Mouth). Principal Component Analysis explained 80.6% of the total variation, whereas Canonical Correspondence Analysis accounted for 98.5% of the variance in fish–environment relationships, identifying water depth, Secchi depth, ammonia, phosphorus and nitrate as key drivers of environmental degradation. Margalef's richness and Hill's diversity indices varied significantly among wetlands, reflecting spatial differences, but showed no significant seasonal variation. Functional feeding group distribution exhibited seasonal shifts, especially among benthic, tolerant and detritivorous species. These findings underscore the ecological importance of Lake Tana's wetlands and the need for targeted conservation measures to sustain fish diversity and habitat integrity.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bathymetric Changes of Lake Chivero, Zimbabwe, as a Result of Sedimentation","authors":"Tendaupenyu Pamela,&nbsp;Dube Timothy,&nbsp;Christopher Hilary Dennis Magadza","doi":"10.1111/lre.70015","DOIUrl":"https://doi.org/10.1111/lre.70015","url":null,"abstract":"<div>\u0000 \u0000 <p>Major dams in Zimbabwe are losing more than half of their design capacity in the first 11 to 12 years of operation. Despite these obvious impacts of sedimentation in the country's reservoirs, sedimentation studies have only been conducted once for 90% of the reservoirs. Thus, a sedimentation estimation study was conducted in November 2014 in Lake Chivero to quantity storage loss due to sedimentation, determine the spatial distribution of sediment deposition in the reservoir, update its elevation-capacity curves and estimate its useful life. The study used a dual beam echo sounder for determining depth measurements. Depth measurements were converted to digital elevation models in a Geographic Information System environment. A comparison of the 1953 and 2014 digital elevation models indicated that the lake was losing depth uniformly. The highest deposition depths were observed towards the dam wall and the deep central parts of the lake along the old river channel. Minimal sediment deposition was generally observed at the shallower parts of the lake, on the north-east and south-western locations. A total of 49126170.34 m³ (18%) of the lake's storage capacity has been lost to sedimentation, which translates to an average annual capacity loss of 792,357 m³ year⁻¹ (0.295% per year) since construction in 1953. The lake's specific sediment yield and remaining useful life were calculated at 352.31 m³ year⁻¹ km⁻² and 106.63 years; respectively. This loss of storage in the lake will impact the operational and economic benefits for which it was built. It will also affect the habitats of its varied flora and fauna. In the absence of original topographic maps produced at the inundation, the dual frequency echo sounder can be used to generate data to estimate sediment loads into the reservoir as well as update elevation-capacity curves.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144339469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Harnessing Hydrochemical Characterisation and ANN-Driven Water Quality Modelling for Wetland Sustainability in Sudurpaschim Province, Central Himalaya, Nepal","authors":"Bindu Dahal,&nbsp;Bikram Adhikari,&nbsp;Tista Prasai Joshi,&nbsp;Motee Lal Sharma,&nbsp;Mahesh Prasad Awasthi,&nbsp;Lalit Pathak,&nbsp;Gyan Kumar Chhipi-Shrestha,&nbsp;Ramesh Raj Pant,&nbsp;Ahmed M. Saqr","doi":"10.1111/lre.70012","DOIUrl":"https://doi.org/10.1111/lre.70012","url":null,"abstract":"<div>\u0000 \u0000 <p>Wetland ecosystems in the Himalayan region face growing threats from climate change, human activities and environmental degradation. This study introduces an integrated approach to assess and predict the water quality index (WQI) for effective wetland management, focusing on the Alital and Bandatal Lakes in Nepal's Sudurpaschim Province. These lakes were selected due to their distinct ecological and geographical characteristics, as well as differing levels of human impact. A total of 40 water samples (20 from each lake) were collected, and 16 physicochemical parameters, including turbidity (Tur.), total dissolved solids (TDS) and major ions were analysed. Hydrochemical properties were characterised using graphical methods, such as the Gibbs and Piper diagrams and the WQI was computed using the arithmetic average method. The hydrochemical facies analysis indicated that carbonate weathering was the dominant process in both wetlands, with Bandatal showing significant anthropogenic influence. The findings revealed that Alital maintained ‘Excellent’ to ‘Good’ water quality, with an average TDS of 64 mg/L and Tur. of 2.14 NTU, reflecting minimal human impact. In contrast, Bandatal exhibited ‘Poor’ to ‘Unsuitable’ WQI classifications, with TDS averaging 115 mg/L and Tur. reaching 63.6 NTU, highlighting substantial human influences. An artificial neural network (ANN) model was developed to predict the WQI, demonstrating outstanding accuracy with an R² of 0.99 for both the training and testing phases. These results underscore the potential of the ANN model for proactive wetland management, aligning with sustainable development goals (SDGs) related to clean water and ecosystem restoration and providing globally applicable insights for wetland conservation.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Allometric Growth and Condition Factors Throughout an Annual Life History of Landlocked Ayu Plecoglossus altivelis altivelis in Haidzuka Dam Reservoir","authors":"Dalia Khatun,&nbsp;Tomomi Tanaka,&nbsp;Masahiro Horinouchi,&nbsp;Hidekazu Yoshioka,&nbsp;Futoshi Aranishi","doi":"10.1111/lre.70011","DOIUrl":"https://doi.org/10.1111/lre.70011","url":null,"abstract":"<p>Ayu <i>Plecoglossus altivelis altivelis</i> is a commercially and recreationally important freshwater fish in Japan. This species is categorised into two ecological forms: amphidromous migrating between rivers and sea and landlocked migrating between rivers and lakes or dam reservoirs. Despite its ecological and economical values, growth analysis has been developed limitedly in the early life history of particularly the amphidromous form, and the growth potential of the landlocked form throughout an annual life history remains almost unknown. This study investigated the allometric growth and condition factors along with their variation among months and life stages of artificial landlocked ayu in Haidzuka Dam reservoir and its connected Tabusa River. A total of 281 individuals were collected monthly from October 2017 to September 2018, and their total length (TL) and body weight (BW) ranged from 1.11 to 14.98 cm and 0.001 to 32.148 g, respectively. Although the allometric coefficient (<i>b</i>) of the length–weight relationship varied from 2.71 to 3.44 among months, it indicated overall positive allometric growth (<i>b</i> = 3.83) calculated from the equation BW = 0.0013TL^3.83. The growth pattern altered significantly among life stages from positive allometric for larvae, juveniles, and youngs to negative allometric for adults. The calculated asymptotic length and growth coefficient of the logistic growth model were 17.71 cm and 3.91 year⁻¹, respectively. Significant differences were found in allometric (<i>K</i>_A) and Fulton's (<i>K</i>_F) condition factors among months, while there was no difference in relative condition factor and relative weight (<i>W</i>_R). Life stage-specific analysis also revealed that the adult stage was nutritionally healthier compared to other life stages based on <i>K</i>_A and <i>K</i>_F. Only <i>K</i>_F showed significant correlations with both TL and BW, making it an ideal condition factor to predict the wellbeing of ayu in this reservoir. Moreover, the Wilcoxon signed-rank test for <i>W</i>_R showed no significant divergence from 100, suggesting a balanced habitat in this reservoir for ayu. These findings will be crucial for further studies and to develop appropriate strategies for the sustainable management of artificial landlocked ayu in dam reservoirs.</p>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/lre.70011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144300118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Distribution and Pollution Assessment of Critical Nutrients and Heavy Metals in the Sediments of Loktak Lake, a Ramsar Site in the Indo-Myanmar Hotspot Region of Manipur Valley (India)","authors":"Ranu Jajo Laishram,&nbsp;Gyanendra Yumnam,&nbsp;Tensubam Basanta Singh,&nbsp;Wazir Alam","doi":"10.1111/lre.70010","DOIUrl":"https://doi.org/10.1111/lre.70010","url":null,"abstract":"<div>\u0000 \u0000 <p>The assessment of nutrient and heavy metal accumulation in lake sediments is essential for understanding their role in the ecohydrological dynamics of lake ecosystems, as sediments can function both as a sink and source of nutrients, metals and various contaminants aquatic ecosystem. The main objective of this study was to evaluate the concentrations of nutrients and heavy metals and their accumulation in the sediments across different sampling locations of Loktak Lake and to compare them against geochemical background values and sediment quality guidelines. The key findings of the study revealed substantial nutrient accumulation in sediments from the Keibul Lamjao National Park site, which can be attributed to the decomposition of organic matter from dense floating vegetative masses called ‘<i>Phumdis</i>’. Iron concentrations in sediments were significantly high, ranging from 909.83 to 1004 mg/kg and its enrichment is likely due to diffused surface runoff from the iron-rich soils from the surrounding catchment entering the lake through feeder rivers and other anthropogenic influences. The average metal concentrations were in the order of Fe &gt; Mn &gt; Zn &gt; Cu, and all values were below the average shale concentrations and the Interim freshwater Sediment Quality Guidelines (ISQG) set by the Canadian Council of Ministers of the Environment (CCME). The evaluation of the heavy metal pollution status of the lake sediments based on various pollution indices such as the contamination factor, degree of contamination, modified degree of contamination, geoaccumulation index, pollution load index and potential ecological risk index, suggested an overall low level of metal pollution in the sediments of Loktak Lake. The findings of this study provide a crucial baseline for understanding on the sediment-associated nutrient and metals dynamics in Loktak Lake which can aid in the formulation of long-term lake management strategies for preserving the ecological integrity and health of this precious lake ecosystem of the region.</p>\u0000 </div>","PeriodicalId":39473,"journal":{"name":"Lakes and Reservoirs: Research and Management","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144244150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}