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Population, Growth and Other Characteristics of Chrysichthys nigrodigitatus (Lacépède, 1803) (Pisces: Claroteidae) From Bui Reservoir, Ghana 加纳Bui水库黑斑蝶种群、生长及其他特征(双鱼座:黑斑蝶科
Q3 Environmental Science Pub Date : 2025-07-09 DOI: 10.1111/lre.70013
Theodore Quarcoopome, Divine Worlanyo Hotor, Acheampong Addo, Ruby Asmah

After five years of impoundment, Bui Reservoir fisheries has evolved with silver catfish, Chrysichthys nigrodigitatus 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 C. nigrodigitatus 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 (L) = 13.07 cm SL, growth constant (K) = 1.01 year,−1 and length at time 0 (to) = 0.18. Growth performance index (ϕ') 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 (E = 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.

经过5年的蓄水,Bui水库的渔业已经发展,其中银鲶鱼和黑尾革鱼是最重要的商业物种。通过对3个站点的162只(雄性62只,雌性39只)的标准体长分析,估计了黑黑的种群结构、健康状况、生长类型、性别比、首次捕获体长以及生长率、死亡率、开发利用等相关参数,为黑黑的可持续管理提供了必要的信息。种群由少年虫组成,雄虫多于雌虫,雌虫相对大于雄虫(模态大小雄性为7.0-7.9,雌虫为9.0-9.9)。尽管有季节波动,女性生理状况优于男性(79.49%的女性条件因子大于2.0,而男性为53.23%)。除雨季后有2个模态外,其余季节均为单峰长度结构,但均为单年类,单次产卵。估计的低异速生长和高异速生长值在季节和性别之间与等距模式没有显著差异。估计的von Bertalanffy生长参数为渐近大小(L∞)= 13.07 cm SL,生长常数(K) = 1.01 year,−1,时间0 (to) = 0.18。生长性能指数(φ)为2.27,生长缓慢,寿命为2.73年。总死亡率、自然死亡率和捕捞死亡率较高(分别为3.56、2.44和1.12),而捕捞死亡率低于最佳水平(E = 0.32)。建议定期评估鱼类数量、生长和其他特征,以便为水库渔业的可持续管理和发展的战略干预提供必要的资料。
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引用次数: 0
A Short Review of the Life of Major Existing Dams in India 印度现有主要水坝寿命的简要回顾
Q3 Environmental Science Pub Date : 2025-07-08 DOI: 10.1111/lre.70019
Shobhit Maheshwari

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.

本研究考察了印度大坝的现状和预计的未来,重点关注老化的基础设施、沉积、不断增加的用水需求和气候变化带来的挑战。目前,印度超过一半的主要水坝的使用年限超过50年,结构恶化和功能下降的风险正在加剧。泥沙淤积是一个关键问题,它导致水库蓄水能力大幅下降,影响农业用水、饮用水和水力发电。此外,预计气候变化将加剧这些挑战,更频繁和更恶劣的天气事件将对水坝造成压力,而这些水坝最初的设计并没有考虑到这种变化。为了确保这些结构的寿命和复原力,必须采取全面的适应措施。主要建议包括大坝基础设施现代化、实施先进的沉积物管理战略、整合气候响应设计特征和加强实时监测系统。未来的研究应该优先考虑气候建模、创新的沉积物控制和地震恢复能力的提高。积极的政策,加上持续的资金和社区参与,对于保护印度的水资源和解决不断变化的环境景观的复杂性至关重要。
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引用次数: 0
GIS-Based Aquaculture Spatial Suitability in Western Amazonian Hydroelectric Reservoirs 基于gis的西亚马逊流域水电水库水产养殖空间适宜性研究
Q3 Environmental Science Pub Date : 2025-07-01 DOI: 10.1111/lre.70016
Carlos Eduardo Mounic-Silva, Flávio Boscatto, Julia Cucco Dalri, Marco Antônio Polli, Flávia Tavares Mattos, Emanuela Rodrigues Meneghetti, Raica Esteves Xavier Meante, Celso Carlos Buglione-Neto, Alex Pires De Oliveira Nuñer

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-a, BOD, total phosphorus, dissolved oxygen); and (5) mapping and estimation of Potential Aquaculture Sites (PAS). Due to excessive seasonal variation (> 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 Colossoma macropomum. 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.

本研究采用基于gis的方法,对巴西西部亚马逊地区贾马里河流域4个水电站网箱养殖的空间适宜性进行了评价,并对关键水质参数进行了分析。评估包括一个大型水电站(HPP Samuel)和三个小型水电站(SHDs): SC Monte Negro, Jamari和Canaã。方法分为五个阶段:(1)总水面面积(TWSA)的时间分析;(2)无植被区识别;(3)深度适宜性评价;(4)编制历史水位资料和湖泊学参数(叶绿素-a、BOD、总磷、溶解氧);(5)潜在水产养殖场址(PAS)的制图和估算。由于季节变化太大(TWSA波动>; 70%), Samuel HPP水库被排除在最终的适宜性制图之外。相比之下,SHD油藏表现出环境稳定性,并满足法律规定的网箱安装要求。据估计,它们利用巨像(Colossoma macropomum)等本地物种,每年可提供高达466吨的生产潜力。大多数水质参数符合巴西环境标准。357/2005)。这种空间和湖泊学评价为在亚马逊水电水库实施可持续水产养殖系统提供了技术基础。进一步的研究应纳入生态承载能力模型和环境影响预测,以支持这些淡水生态系统的长期可持续水产养殖做法。
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引用次数: 0
Demography of Two Fishes Xenentodon cancila (Hamilton, 1822) and Hyporhamphus limbatus (Valenciennes, 1847) From Ujani Reservoir (Maharashtra, India) Facing Multiple Threats 印度马哈拉施特拉邦乌贾尼水库面临多重威胁的两种鱼类的种群统计——黑齿异齿鱼(Hamilton, 1822)和limbatus (Hyporhamphus, 1847
Q3 Environmental Science Pub Date : 2025-07-01 DOI: 10.1111/lre.70017
Ranjit More, Jiwan Sarwade, Vinod Kakade, Omkar Daripkar, Govind Giri, Ganesh Markad

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, Xenentodon cancila and Cangaturi halfbeak, Hyporhampus limbatus, 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 X. cancila (b = 3.12) and H. limbatus (b = 3.15). The estimated potential longevity (tmax) of X. cancila and H. limbatus was 3.48 and 5.76 years, respectively. The observed length at first capture for X. cancila and H. limbatus was 18.53 and 6.66 cm, respectively. Juveniles of H. limbatus face higher exploitation as compared to X. cancila. Higher natural mortality was observed in X. cancila while fishing mortality was higher in H. limbatus. Recruitment analysis revealed two spawning bouts in 1 year for both species. Xenentodon cancila fish stock is under-exploited and H. limbatus fish stock is over-exploited in Ujani reservoir. Further reproductive biology studies are necessary for the effective development and management of fisheries involving X. cancila and H. limbatus.

随着主要河流鱼类的捕捞压力越来越大,代表小型渔业的物种在经济上越来越重要。小型渔业资源的人口特征或人口研究可以深入了解环境问题的影响、养护状况,并有助于渔业的管理和发展。研究了印度浦那Ujani水库淡水garfish (Xenentodon cancila)和canangaturi halfbeak (Hyporhampus limbatus)两种具有商业价值的鱼类种群动态。利用FAO-ICLARM种群评估工具(FISAT)分析了这两种鱼类的长度-权重关系(LWR)和种群动态。LWR分析结果显示,两种植物均呈正异速生长模式(b = 3.12)。估计的潜在寿命(tmax)分别为3.48年和5.76年。白斑田鼠和边缘田鼠的首次捕获长度分别为18.53 cm和6.66 cm。相对于虎斑蝶而言,虎斑蝶的幼鱼面临着更高的剥削。自然死亡率较高的是褐飞蛾,而捕捞死亡率较高的是褐飞蛾。招募分析表明,这两个物种在一年内都有两次产卵。乌贾尼水库梭子鱼资源开发不足,limbatus鱼类资源过度开发。进一步的生殖生物学研究对于有效地开发和管理含黑尾尾和边缘尾尾的渔业是必要的。
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引用次数: 0
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 印度恒河中游7种鲶鱼的长重关系和生长模式:对可持续渔业管理和保护前景的见解
Q3 Environmental Science Pub Date : 2025-06-27 DOI: 10.1111/lre.70018
Rajesh Jayaswal, Durgesh Kumar Verma, Sanatan Paul, Absar Alam, Dharm Nath Jha, Basanta Kumar Das, Canciyal Johnson

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 b ranged from 1.98 for Sperata aor to 3.31 for Sperata seenghala. Also, Rita rita, Sperata aor, Eutropiichthys vacha, Wallago attu and Bagarius bagarius exhibited negative allometric growth (b < 3) while Sperata seengala and Clupisoma garua showed positive allometric growth (b > 3). The coefficient of determination (R2) values ranged from 0.66 to 0.93 across the seven catfish species. Additionally, the relative condition factor (Kn) value is greater than 1 for all the catfish species, indicating that all the catfish species are in good health.

在这项研究中,确定了从印度恒河中游收集的七种鲶鱼的长度-重量关系。这些标本是在2022年11月至2023年10月期间从恒河该地区的Sadiyapur和Daraganj鱼类登陆中心收集的。使用数字卡尺和数字天平测量所有鱼类标本的总长度和体重。生长系数b在1.98 ~ 3.31之间。丽塔、大腹螺、富营养鱼、白头鱼和巴沙鳅呈负异速生长(b > 3),而细尾螺和绿腹螺呈正异速生长(b > 3)。7种鲶鱼的决定系数(R2)在0.66 ~ 0.93之间。所有鲶鱼种类的相对条件因子(Kn)值均大于1,说明所有鲶鱼种类的健康状况良好。
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引用次数: 0
Fish Biodiversity as a Biological Indicator of Aquatic Environmental Quality in Wetlands of Lake Tana, Ethiopia 鱼类生物多样性:埃塞俄比亚塔纳湖湿地水环境质量的生物指标
Q3 Environmental Science Pub Date : 2025-06-25 DOI: 10.1111/lre.70014
Hailu Mazengia, Horst Kaiser, Minwyelet Mingist

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. Labeobarbus intermedius (23.1%–48.9%) and L. brevicephalus (6.7%–44.4%) were the most abundant, whereas L. beso, L. gorguari and L. truttiformis were least common (0%–6.7%). Spatially, Clarias gariepinus dominated at Megech River Mouth (9.4%), and Oreochromis niloticus 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.

对埃塞俄比亚塔纳湖6个湿地的鱼类生物多样性作为水环境质量的生物指标进行了评估。共收集鱼类标本1616份,属3科4属18种。其中,中间Labeobarbus intermedius(23.1% ~ 48.9%)和短头L.(6.7% ~ 44.4%)的数量最多,最小的是L. beso、L. gorguari和L. truttiformis(0% ~ 6.7%)。在空间上,Megech River Mouth以Clarias gariepinus为主(9.4%),Wonjeta和Ras Abbay以Oreochromis niloticus丰富(54.5%)。单位努力渔获量(CPUE)从低于检测限到110.0条/小时不等。鱼类生物完整性指数(FIBI)和生境质量指数(HQI)变化显著,其中古马拉河口和Megech河口的FIBI值最高,为39.0,Zewdie Girar河口和Wonjeta河口的HQI值最高,分别为19.0和18.5。多变量分析根据鱼类组合结构将湿地分为三个不同的集群:集群1 (Wonjeta, Ras Abbay和Avaj),集群2 (Zewdie Girar和Gumara河口)和集群3 (Megech河口)。主成分分析解释了80.6%的总变异,而典型对应分析解释了98.5%的鱼与环境关系变异,确定水深、Secchi深度、氨、磷和硝酸盐是环境退化的关键驱动因素。Margalef丰富度和Hill’s多样性指数在不同湿地间差异显著,反映出空间差异,但不表现出显著的季节变化。功能摄食群的分布呈现季节性变化,尤其是底栖、耐受性和食性三种。这些发现强调了塔纳湖湿地的生态重要性,以及有针对性地采取保护措施以维持鱼类多样性和栖息地完整性的必要性。
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引用次数: 0
Bathymetric Changes of Lake Chivero, Zimbabwe, as a Result of Sedimentation 津巴布韦奇韦罗湖的水深变化,是沉积作用的结果
Q3 Environmental Science Pub Date : 2025-06-23 DOI: 10.1111/lre.70015
Tendaupenyu Pamela, Dube Timothy, Christopher Hilary Dennis Magadza

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.

津巴布韦的主要水坝在最初11到12年的运行中失去了一半以上的设计容量。尽管我国水库的沉积影响明显,但90%的水库只进行了一次沉积研究。因此,2014年11月对切维罗湖进行了泥沙估算研究,以定量泥沙淤积损失,确定库区泥沙淤积的空间分布,更新其高程-容量曲线,估算其使用寿命。该研究使用双波束回声测深仪来确定深度测量。在地理信息系统环境中将深度测量值转换为数字高程模型。1953年和2014年数字高程模型的对比表明,湖深呈均匀下降趋势。沉积深度最大的方向是坝壁和湖的深中心部分沿旧河道。在湖的较浅部分,东北和西南地区,通常观察到最小的沉积物沉积。自1953年建成以来,三峡库容累计减少49126170.34立方米(18%),平均每年减少792357立方米(0.295%)。计算出该湖的比产沙量为352.31 m3年−1 km−2,剩余使用寿命为106.63年;分别。湖中储存量的减少将影响其建设的运营和经济效益。它还将影响其各种动植物的栖息地。在淹没时没有原始地形图的情况下,双频回波测深仪可以产生数据来估计水库的泥沙负荷,并更新高程-容量曲线。
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引用次数: 0
Harnessing Hydrochemical Characterisation and ANN-Driven Water Quality Modelling for Wetland Sustainability in Sudurpaschim Province, Central Himalaya, Nepal 利用水化学特征和人工神经网络驱动的水质模型研究尼泊尔中喜马拉雅地区苏杜尔帕西姆省湿地的可持续性
Q3 Environmental Science Pub Date : 2025-06-20 DOI: 10.1111/lre.70012
Bindu Dahal, Bikram Adhikari, Tista Prasai Joshi, Motee Lal Sharma, Mahesh Prasad Awasthi, Lalit Pathak, Gyan Kumar Chhipi-Shrestha, Ramesh Raj Pant, Ahmed M. Saqr

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.

喜马拉雅地区湿地生态系统面临着气候变化、人类活动和环境退化日益严重的威胁。本研究以尼泊尔苏杜尔帕希姆省的Alital湖和Bandatal湖为研究对象,介绍了一种用于有效湿地管理的水质指数(WQI)评估和预测的综合方法。这些湖泊因其独特的生态和地理特征以及不同程度的人类影响而被选中。共采集了40个水样(每个湖20个),分析了16个理化参数,包括浊度(turr)、总溶解固形物(TDS)和主要离子。采用Gibbs图和Piper图等图解方法对水化学性质进行表征,采用算术平均法计算WQI。水化学相分析表明,两个湿地均以碳酸盐风化为主,班达塔尔湿地受人为影响显著。调查结果显示,Alital保持了“优秀”到“良好”的水质,平均TDS为64毫克/升。2.14 NTU,反映人为影响最小。相比之下,Bandatal表现出“差”到“不合适”的WQI分类,TDS平均为115 mg/L和Tur。达到63.6 NTU,突出了巨大的人为影响。开发了人工神经网络(ANN)模型来预测WQI,在训练和测试阶段都显示出出色的准确性,R2为0.99。这些结果强调了人工神经网络模型在主动湿地管理方面的潜力,与清洁水和生态系统恢复相关的可持续发展目标(sdg)保持一致,并为湿地保护提供了全球适用的见解。
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引用次数: 0
Allometric Growth and Condition Factors Throughout an Annual Life History of Landlocked Ayu Plecoglossus altivelis altivelis in Haidzuka Dam Reservoir 海祖卡坝库内内陆阿育鱼异速生长及其年生活史的影响因素
Q3 Environmental Science Pub Date : 2025-06-16 DOI: 10.1111/lre.70011
Dalia Khatun, Tomomi Tanaka, Masahiro Horinouchi, Hidekazu Yoshioka, Futoshi Aranishi

Ayu Plecoglossus altivelis altivelis 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 (b) of the length–weight relationship varied from 2.71 to 3.44 among months, it indicated overall positive allometric growth (b = 3.83) calculated from the equation BW = 0.0013TL3.83. 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 (KA) and Fulton's (KF) condition factors among months, while there was no difference in relative condition factor and relative weight (WR). Life stage-specific analysis also revealed that the adult stage was nutritionally healthier compared to other life stages based on KA and KF. Only KF 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 WR 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.

Ayu Plecoglossus altivelis altivelis是日本重要的商业和娱乐淡水鱼。该物种分为两种生态形式:在河流和海洋之间的两栖迁徙和在河流和湖泊或水坝水库之间的内陆迁徙。尽管其具有生态和经济价值,但生长分析在早期生活史中发展有限,特别是在两性形式的生活史中,并且在整个年度生活史中,内陆形式的生长潜力几乎仍然未知。本文研究了海祖卡坝水库及其相连的塔布沙河人工内陆鱼的异速生长和条件因子及其在月份和生命阶段的变化。2017年10月至2018年9月,每月共采集281只,体长1.11 ~ 14.98 cm,体重0.001 ~ 32.148 g。虽然不同月份长-重关系的异速生长系数(b)在2.71 ~ 3.44之间变化,但根据公式BW = 0.0013TL3.83计算,整体异速生长为正(b = 3.83)。幼虫、幼鱼和幼鱼的生长模式在不同的生命阶段发生了显著的变化,从正异速生长到负异速生长。logistic增长模型的渐近长度和增长系数分别为17.71 cm和3.91 year−1。异速生长因子(KA)和富尔顿(KF)各月间差异有统计学意义,相对条件因子和相对体重(WR)各月间差异无统计学意义。基于KA和KF的生命阶段特异性分析还显示,与其他生命阶段相比,成年阶段的营养状况更健康。只有KF与TL和BW均呈显著相关,是预测该储层阿玉健康状况的理想条件因子。WR的Wilcoxon sign -rank检验结果表明,WR与100的差异不显著,表明该水库存在平衡生境。这些发现将对进一步研究和制定水坝水库人工内陆流可持续管理的适当战略至关重要。
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引用次数: 0
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) 印度曼尼普尔河谷印缅热点地区拉姆萨尔湖Loktak湖沉积物中关键营养物质和重金属的分布及污染评价
Q3 Environmental Science Pub Date : 2025-06-09 DOI: 10.1111/lre.70010
Ranu Jajo Laishram, Gyanendra Yumnam, Tensubam Basanta Singh, Wazir Alam

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 ‘Phumdis’. 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 > Mn > Zn > 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.

湖泊沉积物中营养物质和重金属的积累对了解其在湖泊生态系统生态水文动力学中的作用至关重要,因为沉积物既是营养物质、金属和各种污染物的汇和源。本研究的主要目的是评估洛克塔克湖不同采样点沉积物中营养物质和重金属的浓度及其积累,并将其与地球化学背景值和沉积物质量准则进行比较。该研究的主要发现揭示了Keibul Lamjao国家公园遗址沉积物中大量的营养物质积累,这可以归因于被称为“Phumdis”的密集漂浮植物团的有机物分解。沉积物中的铁浓度非常高,从909.83到1004 mg/kg不等,其富集可能是由于周围集水区富铁土壤的地表径流通过馈线河流进入湖泊以及其他人为影响。平均金属浓度依次为Fe >;Mn > Zn >;所有这些值都低于平均页岩浓度和加拿大环境部长理事会(CCME)制定的临时淡水沉积物质量指南(ISQG)。基于污染因子、污染程度、修正污染程度、地质堆积指数、污染负荷指数和潜在生态风险指数等污染指标对湖泊沉积物重金属污染状况进行评价,表明洛克塔克湖沉积物重金属污染总体处于较低水平。本研究结果为了解洛克塔克湖沉积物相关的营养和金属动态提供了重要的基础,有助于制定长期湖泊管理策略,以保护该地区宝贵的湖泊生态系统的生态完整性和健康。
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引用次数: 0
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Lakes and Reservoirs: Research and Management
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