IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-12-22 DOI: 10.1016/j.limno.2025.126308

Vinh Quoc Nguyen, Vuong Van Ly, Phuc Le Hoang Nguyen, Lam Thi Thao Vo, Anh Ngoc Tran, Ton Huu Duc Nguyen, Quang Minh Dinh

This study investigated the trophic morphology, feeding habits, and natural diet of Hyporhamphus limbatus in Bac Lieu and Ca Mau province, Southwest Vietnam. A total of 960 individuals were sampled monthly from August 2023 to July 2024 at two sites, Vinh Phuoc, Bac Lieu and Dam Doi, Ca Mau (∼40 fish per site per month). Morphological assessments included mouth orientation, dentition, tongue structure, gill arch anatomy, and intestinal configuration. The mean relative gut length (RGL) was 0.34, consistent with carnivory. Gut content analyses were performed on the subset of fish with non-empty guts (n = 703). Small fishes dominated the diet (58.65 %), followed by ants (13.64 %) and shrimp (12.46 %); other items each contributed < 10 %. PERMANOVA indicated a significant seasonal effect on diet composition (df = 1, F = 11.24, p < 0.001), with fish biomass in guts higher during the wet season, whereas ants increased markedly during rainfall events. No significant dietary differences were detected between sexes or sampling sites. The morphology and diet demonstrate a specialized, primarily piscivorous strategy, which has implications for fisheries resource management and the potential development of aquaculture in Southwest Vietnam.

本研究调查了越南西南部北寮省和金茂省的limbatus的营养形态、摄食习性和自然食性。从2023年8月至2024年7月，在Vinh Phuoc， Bac Lieu和Dam Doi， Ca Mau两个地点每月共采集960只鱼（每个地点每月约40只鱼）。形态学评估包括口腔取向、牙列、舌结构、鳃弓解剖和肠道结构。平均相对肠长（RGL）为0.34，与肉食性一致。对非空肠鱼亚组进行肠道含量分析（n = 703）。以小鱼类为主（58.65 %），其次是蚂蚁（13.64 %）和虾类（12.46 %）；其他项目各贡献<； 10 %。PERMANOVA表明，季节对饲料组成有显著影响（df = 1, F = 11.24, p <； 0.001），肠道中鱼类的生物量在雨季较高，而蚂蚁在降雨期间显著增加。在性别或采样地点之间没有发现显著的饮食差异。形态和食性显示出一种专门的，主要是食鱼的策略，这对越南西南部渔业资源管理和水产养殖的潜在发展具有重要意义。

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引用次数: 0

Climate change increases functional richness and shifts trait composition of benthic macroinvertebrate assemblages along the river continuum 气候变化增加了河流连续体底栖大型无脊椎动物群落的功能丰富度，改变了它们的特征组成

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-12-22 DOI: 10.1016/j.limno.2025.126307

Marie Zhai, Michal Janáč, Michal Horsák, Jindřiška Bojková

The recently observed massive reorganisations of macroinvertebrate assemblages in streams are usually attributed to the combined effects of changes in water quality and climate. The consequences of the associated functional changes for ecosystem services and future development are still unknown. In this study, we try to disentangle the effects of climate change on the functional structure from other anthropogenic effects. To do so, we examine functional richness and composition of biological traits in macroinvertebrate assemblages, coming from 65 near-natural streams in the Czech Republic, where anthropogenic stressors apart from those due to climate change were minimal. We sampled the macroinvertebrates using a standardized biomonitoring sampling protocol during three periods from 1997 to 2015. To understand the patterns along the river continuum, we covered a substantial gradient of source distance (3–260 km). The assemblages previously showed a high increase in total species richness and abundances of many native species. As functional richness directly depends on species richness by virtue of probability, we introduced a novel concept of rarefied functional richness, where assemblages of the species richer period were rarefied to equal the number of species in the less species rich period at each site. We found a significant functional enrichment, predominantly independent of the higher number of species and tending towards a unimodal pattern along the source distance. The functional composition overall shifted to that of downstream sections in all source distance intervals, based mainly on life cycle, body size, locomotion, representation of several feeding groups, and dispersal abilities. The shift was mostly indicative of the substantial effects of lower flow conditions associated with fine sediment deposition, increased temperature and an increase in resources, mainly for collectors/gatherers and predators.

最近观察到的溪流中大型无脊椎动物群落的大规模重组通常归因于水质和气候变化的综合影响。相关功能变化对生态系统服务和未来发展的影响尚不清楚。在本研究中，我们试图将气候变化对功能结构的影响与其他人为影响区分开来。为此，我们研究了来自捷克共和国65条近自然溪流的大型无脊椎动物群落中生物特征的功能丰富度和组成，这些河流除气候变化外人为压力源最小。在1997年至2015年的三个时期，我们使用标准化的生物监测采样方案对大型无脊椎动物进行了采样。为了了解沿河流连续体的格局，我们覆盖了相当大的源距离梯度（3-260 km）。这些组合以前显示出物种总丰富度和许多本地物种丰富度的高增加。由于功能丰富度直接取决于物种丰富度的概率，我们引入了稀薄功能丰富度的新概念，即将物种丰富期的物种组合稀薄到与物种不丰富期的物种数量相等。我们发现一个显著的功能丰富，主要独立于较高的物种数量，并倾向于单峰模式沿源距离。在所有源距离区间内，功能组成总体上向下游部分转移，主要基于生命周期、体型、运动、几种摄食群体的代表性和扩散能力。这种变化主要表明了与细沉积物沉积、温度升高和资源增加相关的低流量条件的实质性影响，主要是对收集者/采集者和捕食者。

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引用次数: 0

Food web modeling and network analysis unravel contrasting ecosystem functions in Ethiopian Rift Valley lakes 食物网建模和网络分析揭示了埃塞俄比亚裂谷湖泊对比生态系统功能

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-12-04 DOI: 10.1016/j.limno.2025.126297

Mathewos Hailu , Seyoum Mengistou , Tadesse Fetahi

Ecosystem-based management is an integrated approach that recognizes biodiversity, the complexity of social ecological systems, and the importance of ecosystem connections. To support this approach, we compared the food web structure and function of three Ethiopian Rift Valley lakes, Lake Ziway, Hawassa, and Chamo, using Ecopath with Ecosim models. A linear inverse modeling approach was employed to estimate unmeasured flows and quantify model uncertainty. The total system throughput was lowest in Lake Ziway (13.9 kt/km²/yr) compared with Lake Chamo (28.8 kt/km²/yr) and Lake Hawassa (36.8 kt/km²/yr), likely reflecting impacts of high turbidity on primary production. Network analysis suggests Lake Chamo has a more mature and organized structure, whereas Lakes Hawassa and Ziway appear more constrained by fisheries exploitation, with Lake Ziway also impacted by high sediment loads. While Lake Chamo showed greater stability, Lake Ziway exhibited the highest nutrient recycling (Finn’s Cycling Index), a potential indicator of system stress. Simulation scenarios exploring perturbations revealed that decreased primary production could increase overall food web efficiency, while recovery of fish biomass may enhance system resilience. This study highlights the value of a holistic, modeling approach in developing tailored, ecosystem-based management strategies for lake ecosystems facing distinct anthropogenic pressures.

基于生态系统的管理是一种综合方法，它认识到生物多样性、社会生态系统的复杂性和生态系统联系的重要性。为了支持这一方法，我们使用Ecopath和Ecosim模型比较了埃塞俄比亚东非大裂谷的三个湖泊——Ziway湖、Hawassa湖和Chamo湖的食物网结构和功能。采用线性逆建模方法估计未测流量，量化模型不确定性。与查莫湖（28.8 kt/km²/年）和哈瓦萨湖（36.8 kt/km²/年）相比，Ziway湖的总系统吞吐量最低（13.9 kt/km²/年），这可能反映了高浊度对初级生产的影响。网络分析表明，查莫湖具有更成熟、更有组织的结构，而哈瓦萨湖和兹威湖受渔业开发的制约更大，兹威湖也受到高泥沙负荷的影响。Chamo湖表现出更强的稳定性，而Ziway湖表现出最高的养分循环（Finn’s Cycling Index），这是一个潜在的系统压力指标。探索扰动的模拟情景显示，初级产量的减少可以提高食物网的整体效率，而鱼类生物量的恢复可能会增强系统的弹性。本研究强调了整体建模方法在为面临不同人为压力的湖泊生态系统制定量身定制的、基于生态系统的管理策略方面的价值。

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引用次数: 0

Seasonal river connections modulate community structure in (sub) tropical temporary pools 季节性河流连接调节（亚热带）临时水池的群落结构

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-12-02 DOI: 10.1016/j.limno.2025.126298

Grite Nelson Mwaijengo , Bram Vanschoenwinkel , Luc Brendonck

In natural river systems in arid and semi-arid lands, surrounding floodplains may contain temporary pools. Some of these may be mainly rain-filled (endorheic systems) while others may be partly rain-fed but connect to the flooding river during a good rainy season (river-connected pools). However, how seasonal river flooding affects the community structure in temporary floodplain pools is not well understood, particularly in the Afro-tropical region. Here, we studied the role of seasonal river connections in modulating water quality and benthic macroinvertebrate community structure and functional feeding groups in a set of endorheic versus river-connected temporary pools in a river-floodplain ecosystem in northeastern Tanzania. Benthic macroinvertebrate communities from the two habitats were significantly differentiated. Spatial species turnover (β-diversity) was higher in river-connected pools, but endorheic ones supported a higher taxon richness (alpha diversity). Benthic macroinvertebrate community dissimilarity between pools was largely determined by turnover rather than by nestedness. Hydrological connectivity was positively associated with electric conductivity and negatively associated with nutrient concentrations in the river-connected pools. In addition, the river facilitated fish dispersal, which likely excluded predation sensitive taxa such as the large branchiopod crustaceans Streptocephalus bourquinii and Streptocephalus wirminghausi. Taxon richness of collector-gatherers and scrapers was significantly different between pool types. Indicator species analysis revealed no specific fauna unique to river-connected pools. This study illustrates that land management schemes that aim to preserve temporary-pool biodiversity should strive to include both endorheic and river-connected pools to support high regional biodiversity, potentially with a priority for the more diverse endorheic systems.

在干旱和半干旱地区的天然河流系统中，周围的洪泛平原可能包含临时水池。其中一些可能主要是雨水充沛的（内源性系统），而另一些可能部分雨水充足，但在雨季与洪水相连（与河流相连的水池）。然而，季节性河流洪水如何影响临时洪泛区水池中的群落结构尚不清楚，特别是在非洲热带地区。在这里，我们研究了季节性河流连接在调节水质和底栖大型无脊椎动物群落结构和功能摄食群体中的作用，这些底栖大型无脊椎动物群落结构和功能摄食群体位于坦桑尼亚东北部的河流-洪泛平原生态系统中。两种生境的底栖大型无脊椎动物群落差异显著。河流连通池的空间物种周转（β-多样性）较高，而内河池的物种丰富度（α多样性）较高。池间底栖大型无脊椎动物群落差异主要由周转而非巢性决定。水文连通性与电导率呈正相关，与河流连接池中的营养物质浓度负相关。此外，河流促进了鱼类的扩散，这可能排除了对捕食敏感的类群，如大型支足甲壳类动物布氏链头和温明豪链头。收集者-采集者和刮刀者的分类丰富度在不同池类型间存在显著差异。指示物种分析显示，与河流相连的水池没有特定的动物群。该研究表明，旨在保护临时池生物多样性的土地管理方案应努力包括内河池和河流相连的池，以支持高区域生物多样性，可能优先考虑更多样化的内河系统。

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引用次数: 0

Colonization and activity of aquatic fungi during the decomposition of Typha latifolia leaf fragments under contrasting hydrological regimes 在不同的水文条件下，黄叶Typha叶片碎片分解过程中水生真菌的定植和活性

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-11-01 DOI: 10.1016/j.limno.2025.126295

Alan Santiago Tarda , Mario Carlos Nazareno Saparrat , Delia Elena Bauer , Nora Gómez

The aim of this study was to evaluate the decomposition of Typha latifolia leaf fragments, characterize the fungal assemblages, and examine their relationship with β-glucosidase activity over a period of 216 days in two riverine wetlands of the Pampean Plain, Argentina, with contrasting hydrological regimes. Decomposition rates were k = 0.004 day⁻¹ and k = 0.002 day⁻¹ in the Chubichaminí and Del Gato wetlands, respectively, with 40 % and 60 % of the initial leaf mass remaining at the end of the experiment. β-Glucosidase activity peaked at day 80 in both wetlands, coinciding with an increase in sporulation rates and fungal taxonomic richness. A total of 38 Ingoldian taxa were identified. Dictyochaeta triseptata and Tetracladium breve were typical of Chubichaminí, while Sigmoidea prolifera and Fibulotaeniella sp. were typical of Del Gato at the beginning of decomposition. Amniculicola longissima became dominant towards the end in both wetlands. In Chubichaminí, spore morphology shifted from predominantly radiate forms at the beginning to filiform types later, whereas in Del Gato, filiform spores remained dominant throughout. T. latifolia decomposition, linked to β-glucosidase activity and fungal community structure, is strongly influenced by hydrological conditions in riverine wetlands. This integrative approach enhances our understanding of wetland functioning and provides insights for adaptive management under climate change and anthropogenic pressures.

本研究的目的是评估Typha latifolia叶片碎片的分解，表征真菌组合，并研究它们与β-葡萄糖苷酶活性的关系，为期216天，在阿根廷潘潘平原的两个河流湿地，具有不同的水文制度。分解率k = 0.004天⁻¹ 和k = 0.002天⁻¹ Chubichamini和德尔Gato湿地,分别与40 60  %和%的初始叶质量剩余实验结束的时候。两个湿地的β-葡萄糖苷酶活性在第80天达到峰值，与产孢率和真菌分类丰富度的增加相一致。共鉴定出38个英戈尔迪亚分类群。Chubichaminí以三叶双翼毛藻（Dictyochaeta triseptata）和短四弧菌（Tetracladium breve）为典型，而Del Gato在分解初期以增殖型Sigmoidea prolifera和Fibulotaeniella sp.为典型。在这两个湿地中，长形Amniculicola longissima逐渐成为优势种。在Chubichaminí中，孢子形态从一开始的主要辐射形式转变为后来的丝状类型，而在Del Gato中，丝状孢子始终占主导地位。河流湿地的水文条件对柽柳分解的影响很大，与β-葡萄糖苷酶活性和真菌群落结构有关。这种综合方法增强了我们对湿地功能的理解，并为气候变化和人为压力下的适应性管理提供了见解。

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引用次数: 0

Spatial synchrony at different taxonomic resolution scales of the zooplankton community in a tropical reservoir 热带水库浮游动物群落在不同分类学分辨率尺度上的空间同动性

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-11-01 DOI: 10.1016/j.limno.2025.126296

Sara Lodi , Cláudia Felix de Almeida , Bruno Spacek Godoy , Daniel de Paiva Silva

Spatial synchrony, defined as the temporal correlation between population fluctuations across different locations, is crucial for understanding the dynamics of ecological communities, especially aquatic ecosystems. Although well studied in temperate systems, the influence of taxonomic resolution on the detection of spatial synchrony remains poorly explored in tropical reservoirs. Here, we investigated the synchrony patterns of the zooplankton community in the tropical Serra do Facão reservoir, located in the Paraná River basin (GO, Brazil), considering limnological, climatic, and operational variables. While overall spatial synchrony was low, we identified a complex geography of synchrony that was significantly associated with local environmental drivers, such as physical and productivity-related variables, for specific taxa. Physical and productivity-related variables correlated with the synchrony of particular taxa (e.g., Daphnia gessneri and Diaphanosoma sp.), whereas climatic and operational factors did not exhibit a significant influence. These findings contrast with studies in temperate reservoirs, suggesting that intrinsic environmental heterogeneity and anthropogenic management suppress broad synchrony patterns. Our results highlight the importance of monitoring local variables in conservation programs for tropical reservoirs and question the effectiveness of approaches based on broad taxonomic groups in detecting synchronized responses. This study provides valuable insights into the sustainable management of aquatic ecosystems under anthropogenic pressure, emphasizing the need for research on larger spatial scales and the consideration of trophic variables to fully comprehend the dynamics of these systems.

空间同步性被定义为不同地点种群波动之间的时间相关性，对于理解生态群落，特别是水生生态系统的动态至关重要。虽然在温带系统中已经有了很好的研究，但在热带水库中，分类分辨率对空间同步检测的影响还没有得到充分的探讨。本文研究了位于巴西帕拉纳河流域的热带Serra do fac水库浮游动物群落的同步模式，考虑了湖泊、气候和操作变量。虽然整体空间同步性较低，但我们发现了一个复杂的地理同步性，它与特定分类群的本地环境驱动因素（如物理和生产力相关变量）显著相关。物理和生产力相关变量与特定分类群的同步性相关（如水蚤和水蚤），而气候和操作因素没有表现出显著的影响。这些发现与温带水库的研究结果相反，表明内在的环境异质性和人为管理抑制了广泛的同步模式。我们的研究结果强调了监测热带水库保护计划中局部变量的重要性，并质疑了基于广泛分类群的方法在检测同步响应方面的有效性。该研究为人为压力下水生生态系统的可持续管理提供了有价值的见解，强调需要在更大的空间尺度上进行研究，并考虑营养变量，以充分理解这些系统的动态。

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引用次数: 0

Microbial communities of desert river: Distinct roles of abundant and rare bacteria in the Tarim River ecosystem 荒漠河流微生物群落：塔里木河生态系统中丰富和稀有细菌的独特作用

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-10-08 DOI: 10.1016/j.limno.2025.126294

Wenjuan Song , Nana Xue , Yuyi Yang , Geoffrey Michael Gadd

Desert inland rivers play crucial role in water resource supply and ecosystem maintenance. The composition and structure of microbial especially bacterial communities have important effects on water environment quality and ecological function. In this study, the composition, assembly mechanisms and co-occurrence network of bacterial communities were studied in Tarim River, the largest inland desert river in China. The research found significant differences in α-diversity and β-diversity between abundant and rare taxa across free-living and particle-associated bacteria. Pseudomonadota dominated bacterial communities, and the abundant taxa and rare taxa of both free-living and particle-associated showed a high variation of percentages. Verrucomicrobiota enriched in the abundant taxa of particle-associated bacteria. TOC, TN and NO₃-N had significant correlation with the composition of rare, total and abundant taxa of both free-living and particle-associated bacteria, while TP also had significant correlation with the composition of rare taxa of free-living bacteria. Total taxa in both free-living and particle-associated bacteria were more fitted by neutral model and influenced by stochastic processes, while the rare and abundant taxa were less influenced by stochastic processes. Furthermore, the co-occurrence network analysis revealed that rare taxa could serve as critical connectors and module hubs in free-living bacteria, compared to particle-associated bacteria. Overall, our study highlights the distinctive roles of abundant taxa and rare taxa in bacterial community assembly and ecosystem function in desert river ecosystems. Understanding these roles is essential for developing conservation strategies aimed at preserving microbial diversity and sustaining ecosystem services in vulnerable habitats.

沙漠内陆河在水资源供给和生态系统维护中发挥着重要作用。微生物特别是细菌群落的组成和结构对水环境质量和生态功能有重要影响。本文以中国最大的内陆沙漠河流塔里木河为研究对象，研究了塔里木河细菌群落的组成、组装机制和共生网络。研究发现，在自由生活菌群和颗粒相关菌群中，α-多样性和β-多样性在丰富菌群和稀有菌群之间存在显著差异。细菌群落以假单胞菌为主，自由生活和颗粒相关的丰富类群和稀少类群百分比差异较大。Verrucomicrobiota在丰富的颗粒相关细菌分类群中富集。TOC、TN和NO3-N与游离菌和颗粒伴生菌的稀有、总、丰度分类群组成呈极显著相关，TP与游离菌的稀有分类群组成呈极显著相关。自由菌和颗粒伴生菌的总分类群均更符合中性模型，受随机过程的影响较大，而稀有和丰富的分类群受随机过程的影响较小。此外，共现网络分析表明，与颗粒相关细菌相比，罕见的分类群可能是自由生活细菌的关键连接器和模块枢纽。总体而言，我们的研究突出了丰富类群和稀有类群在荒漠河流生态系统细菌群落组合和生态系统功能中的独特作用。了解这些作用对于制定旨在保护脆弱栖息地微生物多样性和维持生态系统服务的保护策略至关重要。

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引用次数: 0

Modeling diverse environmental responses of reservoirs to floating photovoltaic systems 模拟水库对浮动光伏系统的不同环境响应

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-10-06 DOI: 10.1016/j.limno.2025.126293

Evan M. Bredeweg , Ivan Arismendi , Christina A. Murphy , Sarah K. Henkel

Floating photovoltaic (FPV) systems are emerging as a promising strategy for large-scale clean energy production worldwide. However, by altering key physical drivers such as solar radiation and wind mixing, FPV installations may have also unintended consequences for lakes and reservoirs. Given the wide diversity of freshwater systems globally, understanding the consistency in direction and magnitude of environmental responses to FPV deployment is critical for informed regulatory oversight and sustainable energy development. Here, we used process-based models to simulate the effects of FPV coverage on 11 reservoirs across the United States. This is the first multi-reservoir analysis using a laterally averaged 2D process-based modeling framework to systematically evaluate FPV impacts across diverse climatic and morphometric contexts, enabling direct comparison of magnitude and direction of responses among systems. Specifically, we evaluated changes in (1) surface and outflow temperature, (2) thermocline depth, (3) water column stability, (4) dissolved oxygen concentrations, and (5) potential suitable habitat availability for warm- and cold-water fishes. We quantified changes in these response variables by an iterative approach that simulates increases in FPV coverage and compares them with reference conditions. We summarized responses for winter (January–February) and summer (July–August). As expected, our simulations show that increasing FPV coverage consistently cooled surface waters and altered thermal stratification patterns, but the magnitude and environmental implications of these changes varied among reservoirs. Notably, greater FPV coverage led to increased variability in habitat suitability for aquatic species, with some reservoirs exhibiting distinct and sometimes divergent responses. These findings underscore the importance of considering local environmental contexts when assessing FPV impacts. While large-scale FPV systems offer potential benefits for climate mitigation, their ecological effects, particularly on thermally sensitive biota, require careful site-specific evaluation to avoid unintended consequences to local freshwater biodiversity.

浮式光伏（FPV）系统正在成为世界范围内大规模清洁能源生产的一种有前途的战略。然而，通过改变关键的物理驱动因素，如太阳辐射和风混合，FPV装置也可能对湖泊和水库产生意想不到的后果。鉴于全球淡水系统的广泛多样性，了解FPV部署对环境反应的方向和程度的一致性对于知情的监管监督和可持续能源发展至关重要。在这里，我们使用基于过程的模型来模拟FPV覆盖对美国11个水库的影响。这是第一次使用横向平均2D过程建模框架进行多油藏分析，系统地评估了不同气候和形态背景下的FPV影响，从而可以直接比较系统之间响应的幅度和方向。具体来说，我们评估了(1)地表和流出温度的变化，(2)温跃层深度的变化，(3)水柱稳定性的变化，(4)溶解氧浓度的变化，以及(5)温暖和冷水鱼类的潜在适宜栖息地可用性的变化。我们通过迭代方法量化了这些响应变量的变化，该方法模拟了FPV覆盖率的增加，并将其与参考条件进行了比较。我们总结了冬季（1 - 2月）和夏季（7 - 8月）的反馈。正如预期的那样，我们的模拟表明，FPV覆盖范围的增加持续地冷却了地表水，改变了热分层模式，但这些变化的幅度和环境影响在不同的水库之间有所不同。值得注意的是，更大的植被覆盖度导致水生物种生境适宜性的变异性增加，一些水库表现出明显的、有时是不同的响应。这些发现强调了在评估FPV影响时考虑当地环境背景的重要性。虽然大型FPV系统为减缓气候变化提供了潜在的好处，但它们的生态效应，特别是对热敏感的生物群的生态效应，需要对具体地点进行仔细的评估，以避免对当地淡水生物多样性造成意想不到的后果。

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引用次数: 0

Optimizing phosphorus release risk index based on river sediment physicochemical properties 基于河流底泥理化性质的磷释放风险指数优化

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-09-18 DOI: 10.1016/j.limno.2025.126292

Wen Zhang , Wenxi Pan , Qin You , Ningtao Wang

This study develops a framework to optimize the selection of phosphorus release risk indices (PRRIs) for river sediments, based on key physicochemical properties—organic matter (OM), redox potential (Eh), and the CDB-P/Ca-P ratio (ROP). To address variability in PRRI applicability across sediment types, sediments from six rivers in China’s Sichuan Basin were analyzed. Results show that universal indices—including the Eutrophication Risk Index (ERI), Soil Phosphorus Storage Capacity (SPSC), Degree of Phosphorus Saturation (DPS), and Phosphorus Sorption Index (PSI)—exhibit strong, significant correlations with phosphorus release fluxes across all sediment categories (r = 0.71–0.89, p < 0.01). Sediment classification further improves prediction accuracy: ERI and PSI perform best in OM-rich sediments (OM-1), where organic matter drives adsorption-desorption processes; Non-apatite inorganic P (NAIP) and Water-Soluble P (WSP) are reliable indicators in CDB-P-dominated systems (ROP-1); ERI is prioritized in weakly reducing sediments (Eh-2) (r = 0.90); and DPS, alongside Equilibrium P Concentration at net zero sorption (EPC₀), is more applicable in Ca-P-dominated sediments (ROP-2). This framework balances assessment accuracy and operational feasibility, offering actionable guidance for precise phosphorus release risk evaluation and targeted watershed management.

本研究基于河流沉积物的主要理化性质——有机质（OM）、氧化还原电位（Eh）和CDB-P/Ca-P比值（ROP），构建了优化河流沉积物磷释放风险指标（PRRIs）选择的框架。为了解决PRRI适用性在沉积物类型上的变化，对中国四川盆地6条河流的沉积物进行了分析。结果表明，富营养化风险指数（ERI）、土壤磷储藏量（SPSC）、磷饱和度（DPS）和磷吸附指数（PSI）等通用指标与各沉积物类型的磷释放通量呈显著相关性（r = 0.71-0.89,p <； 0.01）。沉积物分类进一步提高了预测精度：ERI和PSI在富有机质沉积物（OM-1）中表现最佳，有机质驱动吸附-解吸过程；非磷灰石无机磷（NAIP）和水溶性磷（WSP）是cdb -P主导体系（ROP-1）的可靠指标；ERI在弱还原性沉积物（Eh-2）中优先（r = 0.90）；DPS和净零吸附平衡P浓度（EPC 0）更适用于ca -P为主的沉积物（ROP-2）。该框架平衡了评估准确性和操作可行性，为磷释放风险精准评价和流域定向管理提供了可操作的指导。

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引用次数: 0

A technique to monitor growth and spread of early-stage variable-leaf watermilfoil in a shallow impoundment 浅水库中早期变叶水叶藻生长和扩散的监测技术

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-09-17 DOI: 10.1016/j.limno.2025.126291

Noah Bohl , Michael R. Twiss , Diana T. White

We describe an approach to measure the invasiveness of Myriophyllum heterophyllum (variable leaf watermilfoil) in a shallow dystrophic impoundment at the early stages of an invasion. Over an eight-week observation period, dry weight measurements show a biomass specific rate growth rate of 0.0048·day⁻¹, consistent with other studies of invasive watermilfoil growth, and a diffusion rate (biomass spread) of D = 9.2 cm²·d⁻¹, which describes the horizontal encroachment into plant-free sediment.

我们描述了一种方法来测量在入侵的早期阶段，在一个浅营养不良的蓄水池的异型狐尾藻（可变叶水千叶）的入侵。在8周的观测期内，干重测量结果显示，其生物量比增长率为0.0048·day - 1，与其他研究结果一致，其扩散速率（生物量扩散）为D = 9.2 cm2·D - 1，描述了对无植物沉积物的水平侵入。

引用次数: 0

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