Limnologica最新文献_第3页

Ecological risk assessment of the impact of trace metal contamination on the benthic fauna and sediment of River Siluko, Edo State, Nigeria 痕量金属污染对尼日利亚江户州Siluko河底栖动物和沉积物影响的生态风险评估

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-09-01 Epub Date: 2025-09-03 DOI: 10.1016/j.limno.2025.126281

N.K. Egun , U.C. Olowo , E. Erhurhu , C.O. Enabulele , I.P. Oboh

This study evaluated the potential ecological and human health risk of trace metal pollution in sediment and benthic fauna (Pila ampullacea) of River Siluko. Result showed trace metal contamination of both sediment and P. ampullacea, with concentration profile of Fe > Zn > Cu > Cr > Mn > Co > Ni > Pb in sediments, and Fe > Zn > Cu > Mn > Ni > Co > Cr > Pb in P. ampullacea. Contamination factor values for Zn, Cu, Mn, Cr, Co, Ni and Pb were of low degree contamination (CF < 1) and Fe was of very high degree of contamination (CF > 6). The contamination degree (CD) values of the study Stations indicate a very high degree of sediment contamination from trace metals (CD ≥ 24). Potential ecological risk index (PERI) values classified the study stations 1, 2, 3 and 4 as of low ecological risk (PERI ≤ 150). Toxic Response Index Values (TRI) indicate no risk to aquatic organisms (TRI ≤ 5). Human health risk assessment associated with the consumption of contaminated P. ampullacea indicated non – carcinogenic risk (HI > 1) and carcinogenic risks to consumers, as the integrated carcinogenic risk (ICR) value classified the consumption of the edible part of P. ampullacea as extremely high risk (Grade VII) to consumers. The need for exigent actions to be taken in the abatement and regulation of identified anthropogenic activities responsible for the release of these metals into River Siluko is recommended.

本研究评价了丝鲁科河沉积物和底栖动物中痕量金属污染的潜在生态和人类健康风险。结果显示微量金属污染的沉积物和p . ampullacea浓度剖面的Fe祝辞 锌祝辞 铜祝辞 Cr祝辞 Mn祝辞 公司祝辞 倪祝辞 Pb在沉积物和菲比; 锌祝辞 铜祝辞 Mn祝辞 倪祝辞 公司祝辞 Cr祝辞 p . ampullacea Pb。Zn、Cu、Mn、Cr、Co、Ni、Pb污染系数值为低污染程度（CF < 1）， Fe污染系数值为高污染程度（CF > 6）。各监测站的污染程度（CD）值表明沉积物受微量金属污染的程度非常高（CD≥24）。潜在生态风险指数（PERI）将1、2、3、4站划分为低生态风险（PERI≤150）。毒性反应指数（TRI）提示对水生生物无风险（TRI≤5）。食用受污染的壶形参的人类健康风险评估显示，消费者存在非致癌风险（HI > 1）和致癌风险，因为综合致癌风险（ICR）值将消费者食用壶形参的可食用部分划分为极高风险（VII级）。建议有必要采取紧急行动，减少和管制已查明的导致这些金属排放到锡卢科河的人为活动。

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引用次数: 0

Simultaneous monitoring of algal bloom and aquatic vegetation in eutrophic shallow lakes of the middle and lower yangtze river basin using deep learning 基于深度学习的长江中下游富营养化浅湖藻华与水生植被同步监测

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-09-01 Epub Date: 2025-08-24 DOI: 10.1016/j.limno.2025.126280

Jingming Wang , Yu Cai , Chang-Qing Ke , Jianwan Ji , Yao Xiao , Genyu Wang , Haili Li

In recent years, lake ecosystems have faced severe challenges, including the increasingly severe problem of lake eutrophication and the rapid degradation of aquatic vegetation (AV). These issues pose significant threats to water quality, biodiversity, and human health. Traditional methods struggle to accurately and simultaneously monitor algal bloom (AB) and AV due to their similar spectral characteristics. Furthermore, existing studies have predominantly focused on large lakes, leaving small and medium-sized lakes understudied. This study addresses these gaps by employing the UNet+ + deep learning model to simultaneously map AB and AV in 44 eutrophic shallow lakes (area>20 km²) in the middle and lower Yangtze River Basin (MLY). Utilizing Landsat remote sensing images from 2013 to 2023, the research provides a comprehensive analysis of the spatiotemporal dynamics of AB and AV. The results reveal significant spatiotemporal variations in AB and AV distribution. Additionally, the number of lakes experiencing algal bloom increased significantly (p < 0.01), and the area of aquatic vegetation exhibited a significant decrease. Unlike previous studies that focused on single categories or large lakes, this research addresses the complexity of "grass-algae coexistence" and provides a comprehensive understanding of their spatiotemporal dynamics. This research not only advances the application of deep learning in aquatic ecosystem monitoring, but also provides valuable insights for lake management and ecological restoration in the MLY region.

近年来，湖泊生态系统面临着严峻的挑战，湖泊富营养化问题日益严重，水生植被迅速退化。这些问题对水质、生物多样性和人类健康构成重大威胁。由于藻华（AB）和藻华（AV）的光谱特征相似，传统的方法难以同时准确地监测它们。此外，现有的研究主要集中在大型湖泊，而对中小型湖泊的研究不足。本研究利用UNet+ +深度学习模型对长江中下游44个富营养化浅湖（面积20 km²）进行AB和AV同步映射，解决了这些空白。利用2013 - 2023年的Landsat遥感影像，对AB和AV的时空动态进行了综合分析，结果表明AB和AV的分布具有明显的时空变化特征。此外，发生藻华的湖泊数量显著增加（p <； 0.01），水生植被面积显著减少。不同于以往的研究集中在单一类别或大型湖泊上，本研究解决了“草藻共存”的复杂性，并提供了对其时空动态的全面理解。该研究不仅推进了深度学习技术在水生生态系统监测中的应用，而且为湖泊管理和生态恢复提供了有价值的见解。

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引用次数: 0

Organic nitrogen fuels phytoflagellate expansion in browning lakes: Evidence from paleolimnological records 有机氮促进褐化湖泊中鞭毛藻的扩张：来自古湖泊记录的证据

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-09-01 Epub Date: 2025-08-18 DOI: 10.1016/j.limno.2025.126278

Camilla Hedlund Corneliussen Hagman , Gunnhild Riise, Thomas Rohrlack

The increasing influx of terrestrially derived dissolved organic matter (DOM) into lakes, commonly referred to as browning, is a widespread phenomenon with significant ecological and societal consequences. Browning is frequently associated with the proliferation of mixotrophic phytoflagellates (PFs), yet the underlying mechanisms remain debated. In this paleolimnological study, sediment cores from seven lakes in southeastern Norway were analyzed to assess the role of potential drivers of PF success. The study focused on two ecologically distinct PFs, Gonyostomum semen and cryptophytes, using pigment biomarkers to reconstruct their historical abundance alongside proxies for DOM, nutrients, and climate. Piecewise regression analysis revealed increases in both PFs with a relatively high degree of synchrony. Generalized additive models identified nitrogen as the most consistent predictor of PF-specific pigments, while DOM was the primary predictor of nitrogen concentrations. These findings support the hypothesis that browning promotes PF expansion primarily by increasing the input of organic nitrogen that enters lakes as a component of DOM. Other proposed mechanisms, such as enhanced stratification, reduced transparency, or iron enrichment, were not consistently supported across lakes. The temporal patterns of browning and increasing PF success suggest a strong influence from historical land-use changes, particularly afforestation and wetland drainage. Results of the present study highlight the importance of land-use legacies in shaping phytoplankton community structure and provide new insights into the ecological consequences of ongoing DOM enrichment in inland waters.

陆地衍生的溶解有机物（DOM）越来越多地流入湖泊，通常被称为褐变，这是一种普遍现象，具有重大的生态和社会后果。褐变通常与混合营养型植物鞭毛藻（PFs）的增殖有关，但其潜在机制仍存在争议。在这项古湖泊学研究中，对挪威东南部七个湖泊的沉积物岩心进行了分析，以评估PF成功的潜在驱动因素的作用。该研究聚焦于两种生态上不同的PFs， Gonyostomum semen和cryptophytes，使用色素生物标志物重建它们的历史丰度，以及DOM、营养和气候的代用物。分段回归分析显示，两种PFs的增加具有相对较高的同步性。广义加性模型发现氮是最一致的预测因子，而DOM是氮浓度的主要预测因子。这些发现支持了褐变主要通过增加作为DOM组成部分进入湖泊的有机氮的输入来促进PF扩展的假设。其他提出的机制，如加强分层、降低透明度或铁富集，并没有得到湖泊间一致的支持。褐化和森林覆盖率增加的时间格局表明，历史土地利用变化，特别是造林和湿地排水，对森林的影响很大。本研究结果强调了土地利用遗产在形成浮游植物群落结构中的重要性，并为内陆水域持续DOM富集的生态后果提供了新的见解。

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引用次数: 0

Rainfall-driven shifts in eukaryotic microbial communities: Enhanced stochasticity and altered co-occurrence networks in the Fen River 降雨驱动的真核微生物群落变化：增强的随机性和改变的共现网络在汾河

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-09-01 Epub Date: 2025-07-14 DOI: 10.1016/j.limno.2025.126269

Lihui Liu , Lin Zhang , Ruikai Zhang, Shulian Xie, Fangru Nan, Yang Liu

Rivers are fundamental components of the Earth's hydrological system, and their hydrogeochemical processes play a critical role in maintaining the stability of ecological communities and socio-economic development. In this study, we employed 18S rRNA gene sequencing, neutral community modeling, null model analysis, and co-occurrence network analysis to investigate shifts in the composition and assembly processes of eukaryotic microbial communities before and during a rainfall event. Taxonomic analysis revealed that Chlorophyta and Rotifera were the dominant eukaryotic taxa. Compared with pre-rainfall conditions, the relative abundance of Chlorophyta increased by 13.53 % during rain, while that of Rotifera decreased by 17.66 %. Among the rare taxa, Chlorophyta and Chytridiomycota accounted for relatively high proportions. Our findings indicate that stochastic processes primarily drive the assembly of riverine eukaryotic microbial communities, with rainfall events amplifying the influence of stochasticity and diminishing the influence of deterministic processes. Rainfall substantially increased the strength of dispersal limitation, which had a major effect on rain-associated communities with broader ecological niche breadths. Rainfall also induced significant shifts in ecological niches and destabilized co-occurrence networks among eukaryotic microbes, as evidenced by pronounced changes in node degree metrics. Our findings provide valuable insights into the structure, dynamics, and ecological processes of eukaryotic microbial communities under the influence of rainfall and enhance our understanding of freshwater microbial ecology.

河流是地球水文系统的基本组成部分，其水文地球化学过程对维持生态群落稳定和社会经济发展起着至关重要的作用。本研究采用18S rRNA基因测序、中性群落建模、零模型分析和共现网络分析等方法，研究了降雨前和降雨过程中真核微生物群落组成和组装过程的变化。分类分析表明，绿藻门和轮虫门是真核生物的优势类群。与雨前相比，雨后绿藻的相对丰度增加了13.53 %，轮状植物的相对丰度减少了17.66 %。在稀有分类群中，绿藻门和壶菌门所占比例较高。我们的研究结果表明，随机过程主要驱动河流真核微生物群落的聚集，降雨事件放大了随机性的影响，减弱了确定性过程的影响。降雨大大增加了扩散限制的强度，这对生态位宽度较宽的雨伴生群落有主要影响。降雨还引起了生态位的显著变化和真核微生物共生网络的不稳定，这可以从节点度指标的显著变化中得到证明。我们的研究结果对降雨影响下真核微生物群落的结构、动态和生态过程提供了有价值的见解，并增强了我们对淡水微生物生态学的认识。

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引用次数: 0

The early colonisation of experimental mesocosms: The role of active and passive dispersal mode 实验中生态系统的早期殖民化：主动和被动扩散模式的作用

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-07-01 Epub Date: 2025-05-07 DOI: 10.1016/j.limno.2025.126256

Lukáš Pfeifer , Michal Šorf , Vanda Šorfová

Ephemeral wetlands represented a special type of periodic waters that are often found in intensively agriculturally managed landscapes. This study demonstrates the influence of both soil addition and the presence of Daphnia magna competitor on the development of invertebrate communities in experimental mesocosms. Treatments included rainwater-filled mesocosms with and without the addition of Daphnia magna, and with and without the addition as arable soil serving as a potential egg bank source. The early colonisation was monitored by two subsequent sampling periods with a total exposition time of 42 days. We hypothesised that factors potentially influencing emerging species communities may include the presence and absence of D. magna as a community engineer, as well as the presence and absence of soil fraction. The results showed that the addition of arable soil significantly influenced physico-chemical parameters, increasing conductivity and total nitrogen. Rotifers were the first colonisers, with a higher abundance in treatments with added soil. D. magna survived and established populations only in treatment with added arable soil but did not survive in rainwater only treatment. Chironomids were the most diverse group, with increased abundance and taxa richness over time. The presence of D. magna in the soil-amended treatment resulted in a unique community structure, likely due to its grazing impact on the food web.

短暂湿地是一种特殊类型的周期性水域，通常出现在集约化农业管理的景观中。本研究探讨了土壤添加和大水蚤的存在对实验中生态系统无脊椎动物群落发育的影响。处理包括添加和不添加水蚤的充满雨水的中生态系统，以及添加和不添加水蚤作为潜在卵库来源的耕地土壤。早期的定植通过随后的两次采样来监测，总暴露时间为42天。我们假设潜在影响新兴物种群落的因素可能包括作为群落工程师的D. magna的存在和缺失，以及土壤组分的存在和缺失。结果表明，添加耕地土壤显著影响了土壤理化参数，提高了土壤电导率和总氮含量。轮虫是第一批殖民者，在添加土壤的处理中数量更高。大蠊仅在添加耕地土壤处理下存活并建立种群，而仅在雨水处理下不能存活。摇尾虫是最多样化的类群，其丰度和分类丰富度随时间的推移而增加。D. magna在土壤改良处理中的存在导致了独特的群落结构，可能是由于其对食物网的放牧影响。

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引用次数: 0

Soil particles and elevation shape the distribution of prokaryotic communities in Poyang Lake 土壤颗粒和海拔高度决定了鄱阳湖原核生物群落的分布

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-07-01 Epub Date: 2025-06-27 DOI: 10.1016/j.limno.2025.126268

Yajun Liu , Hui Zhong , Mi Deng , Zeyong Chi , Xiangmin Liu , Rongfu Li , Yongming Wu

The differential deposition and elevation changes of soil are crucial factors influencing the transformation of wetland ecological functions. This study aims to investigate the effects of soil particle composition and elevation on prokaryotic communities and associated nutrient cycles. In this study, two distinct soil collection areas with varying sedimentary environments in Poyang Lake, China, were selected, and wetland soil samples were collected along the wetland slope, ranging from low to high altitude. Employing 16S rRNA gene sequencing and analyses of soil enzyme activities, we investigated prokaryotic (archaeal and bacterial) communities and their functions related to carbon, nitrogen, and phosphorus metabolism. The results showed that the Shannon indices of Archaea and Bacteria, as well as network complexity, were significantly greater in high-sand soils (sand, 55 %–93 %) compared to high-clay soils (sand, 23 %–42 %). The diversity (ACE and PD_whole_tree) of Archaea and Bacteria declined with elevation. Carbon and phosphorus-related enzyme activity was higher in clay-rich soils than in sand-rich soils, while nitrogen-related enzyme activity was not affected by soil particles. All carbon metabolism-related enzyme activities were influenced by elevation, unlike nitrogen and phosphorus. Furthermore, we found that soil particles indirectly affect prokaryotic communities by correlating with soil nutrients and pH, while elevation indirectly affects prokaryotic communities by correlating with soil moisture and pH. Soil particles contributed more significantly than elevation to the variation observed in archaeal and bacterial communities. These findings enhance our understanding of the effects of soil particles and elevation on wetland ecosystems from a microbial perspective.

土壤的差异沉积和高程变化是影响湿地生态功能转变的关键因素。本研究旨在探讨土壤颗粒组成和海拔对原核生物群落及相关养分循环的影响。本研究选取鄱阳湖两个不同沉积环境的土壤采集区，沿湿地坡面从低海拔到高海拔采集湿地土壤样品。通过16S rRNA基因测序和土壤酶活性分析，研究了原核生物（古细菌和细菌）群落及其碳、氮、磷代谢相关功能。结果表明，高砂土（砂，55 % ~ 93 %）中古细菌和细菌的Shannon指数以及网络复杂性显著高于高粘土（砂，23 % ~ 42 %）。古细菌和细菌的多样性（ACE和PD_whole_tree）随海拔升高而下降。土壤中碳、磷相关酶活性在富粘土土壤中高于富砂土壤，而氮相关酶活性不受土壤颗粒的影响。与氮、磷不同，所有碳代谢相关酶活性均受海拔的影响。此外，我们发现土壤颗粒通过土壤养分和pH间接影响原核生物群落，而海拔通过土壤湿度和pH间接影响原核生物群落。土壤颗粒对古细菌和细菌群落的影响比海拔更显著。这些发现从微生物的角度加深了我们对土壤颗粒和海拔对湿地生态系统影响的认识。

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引用次数: 0

Chironomidae communities from the Mazafran watershed as bioindicators of water quality and biodiversity with implications for global freshwater ecosystems 马扎夫兰流域的手蛾科群落作为水质和生物多样性的生物指标及其对全球淡水生态系统的影响

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-07-01 Epub Date: 2025-06-27 DOI: 10.1016/j.limno.2025.126266

Ghiles Smaoune , Ibrahim Yahiaoui , Imane Saal , Djaouida Bouchelouche , Nassima Doukhandji , Ceria Hamache , Qiang Zhang

This study investigates the use of Chironomidae communities as bioindicators to evaluate biodiversity and water quality in freshwater habitats. A crucial sub-basin in a north African coastal area, it is subject to severe pollution and urbanisation pressures, which makes it a perfect model for comprehending how human activity affects aquatic ecosystems. We performed physico-chemical assessments of water quality indicators, in addition to monthly sampling of Chironomidae larvae and macroinvertebrates at 13 sites during a one-year period. Chironominae and Orthocladiinae emerged as the leading subfamilies among the 55 Chironomidae taxa, which comprise 30,145 individuals. As a result, downstream stations showed indications of severe contamination, but upstream stations had the maximum species diversity. The Canonical Correspondence Analysis (CCA) demonstrated the sensitivity of Chironomidae to habitat conditions by revealing robust connections between environmental variables and species distribution. While Orthocladius rubicundus was a critical signal of high-water quality upstream, the Dominant Species Chironomid Index (D.S.C.I.) further confirmed considerable water quality degradation downstream, in contrast to the biological balance observed upstream. These results highlight the usefulness of biotic indices based on Chironomidae for biomonitoring and offer important management insights for freshwater ecosystems in areas affected by pollution and urbanisation.

本研究利用摇蝇科群落作为生物指标评价淡水生境的生物多样性和水质。它是北非沿海地区一个重要的子盆地，受到严重的污染和城市化压力，这使它成为理解人类活动如何影响水生生态系统的完美模型。在一年的时间里，我们对水质指标进行了物理化学评估，并在13个地点每月取样手摇蚊幼虫和大型无脊椎动物。Chironominae和Orthocladiinae是55个Chironominae分类群中最主要的亚科，共有30145个个体。结果表明，下游站点污染严重，但上游站点的物种多样性最大。典型对应分析（CCA）通过揭示环境变量与物种分布之间的强大联系，揭示了手摇蝇科对生境条件的敏感性。虽然rubicundus是上游高水质的关键信号，但优势种Chironomid指数（D.S.C.I.）进一步证实了下游水质的严重退化，与上游的生物平衡相反。这些结果强调了基于手蛾科生物指数的生物监测的有效性，并为受污染和城市化影响地区的淡水生态系统管理提供了重要的见解。

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引用次数: 0

Nuanced effects of organic matter on native phytoplankton and non-native Ceratium: A case study re-analyzing field data using non-linear thresholds 有机物质对原生浮游植物和非原生Ceratium的细微影响：一个使用非线性阈值重新分析实地数据的案例研究

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-07-01 Epub Date: 2025-06-21 DOI: 10.1016/j.limno.2025.126265

Rafael Lacerda Macêdo , Ana Clara Sampaio Franco

Anthropogenic pressures such as extreme climate events and biological invasions have led to declines in water quality and biodiversity. Using a 5-year monitoring dataset, from 2014 to 2018, in an artificial lake designated for drinking water supply, this case study aims to identify ecological thresholds of organic matter that lead to fundamental changes in phytoplankton biodiversity. We hypothesize that 1) native taxa would predominantly decline in frequency and abundance, while abundance of the invasive Ceratium would increase with higher organic matter concentration; and 2) significant negative impacts on native total abundance and richness (taxonomic and functional) would occur above the identified threshold. Regarding population-level changes, all sensitive taxa were native, whereas the invasive Ceratium showed tolerance, possibly through heterotrophic carbon assimilation. Overall, native taxa decline at 4.9 mgL^-1 whereas Ceratium significantly increases at 5.6 mgL^-1 along the organic matter gradient. At the community-level, native phytoplankton abundance, as well as taxonomic and functional richness, declined significantly above the identified community threshold of 5.25 mg/L. We call for a stronger understanding of the impacts of organic matter and biological invasions across different reservoirs, and recommend incorporating biomass data to improve the broader applicability of ecological thresholds.

极端气候事件和生物入侵等人为压力导致水质和生物多样性下降。利用2014 - 2018年的5年监测数据，本案例研究旨在确定导致浮游植物生物多样性发生根本性变化的有机物质生态阈值。结果表明：1)随着有机质浓度的增加，本土分类群的数量和丰度呈下降趋势，而入侵分类群的数量则呈增加趋势；2)超过所确定的阈值，对本地总丰度和丰富度（分类和功能）将产生显著的负面影响。在种群水平变化方面，所有敏感类群均为本地类群，而入侵的Ceratium则表现出耐受性，可能是通过异养碳同化。总体而言，沿有机质梯度，原生类群在4.9 mg -1时下降，而Ceratium在5.6 mg -1时显著增加。在群落水平上，原生浮游植物丰度、分类丰富度和功能丰富度均显著下降，高于群落阈值5.25 mg/L。我们呼吁加强对有机质和生物入侵对不同水库的影响的理解，并建议纳入生物量数据以提高生态阈值的更广泛适用性。

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引用次数: 0

Distribution of zooplankton functional groups in a tropical reservoir and their relationship with the trophic state index 热带水库浮游动物功能群分布及其与营养状态指数的关系

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-07-01 Epub Date: 2025-06-13 DOI: 10.1016/j.limno.2025.126264

Renato Miziara Assef dos Santos , Maria José dos Santos-Wisniewski , Odete Rocha

This study investigated the dynamics of zooplankton assemblage in the Furnas Hydroelectric Reservoir, highlighting the spatial and temporal variations in community characteristics in response to trophic gradients and environmental pressures. The research involved samples collected over different times of the year in two sub-basins (Sapucaí and Grande), revealing significant differences in the richness and diversity of zooplankton species, especially during the rainy season. The analysis of functional groups, unlike traditional diversity indices, detected changes in the zooplankton community related to the trophic state. Mesotrophic conditions appear to functionally favor zooplankton, while in eutrophic environments, there is a dominance of opportunistic rotifers. The functional structure of the zooplankton community was characterized by strong intragroup dominance variation, resulting in high functional redundancy. Filter-feeding Cladocera exhibited low tolerance to higher trophic levels, while Rotifera functional groups were representative across all trophic levels. The results indicate that the functional approach provides a more detailed understanding of the resilience and adaptations of the zooplankton community in response to environmental pressures.

本文研究了富纳斯水电站库区浮游动物群落的动态变化，揭示了群落特征随营养梯度和环境压力的时空变化规律。该研究涉及在一年中的不同时间在两个子流域（Sapucaí和Grande）收集的样本，揭示了浮游动物物种的丰富度和多样性的显着差异，特别是在雨季。与传统的多样性指数不同，官能团的分析检测了与营养状态相关的浮游动物群落的变化。中营养环境似乎在功能上有利于浮游动物，而在富营养环境中，机会轮虫占主导地位。浮游动物群落的功能结构具有较强的群内优势变异特征，具有较高的功能冗余度。滤食性枝角目对高营养水平的耐受性较低，轮虫目的功能群在所有营养水平上都具有代表性。结果表明，功能方法可以更详细地了解浮游动物群落对环境压力的适应能力和适应能力。

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引用次数: 0

Variations of zooplankton community as bioindicators of eutrophication and water quality in shallow Yangtze Lakes 浮游动物群落变化作为长江浅水湖泊富营养化和水质的生物指标

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica

Pub Date : 2025-05-01 Epub Date: 2025-04-04 DOI: 10.1016/j.limno.2025.126248

Jiangqianhui Qi , Yang Wang , Jing Yuan , Chuansong Liao , Jiashou Liu , Chuanbo Guo

The Yangtze River and its adjacent lakes form a complex river-lake ecosystem, rich in aquatic biodiversity, with zooplankton serving as a key component. Zooplankton is important in nutrient circulation and energy flow, and also serves as an important indicator reflecting water quality and the overall health of aquatic ecosystems. Studying the changes in zooplankton community structure, which fluctuate with physicochemical environment, is crucial for understanding variations in lake water quality. We surveyed 15 shallow lakes of this river-lake ecosystem in the middle reaches of the Yangtze River. Using K-means cluster analysis based on the relative density ratios of Protozoa, Rotifera, Cladocera, and Copepoda, we classified the lakes into three distinct groups (Groups I to III). Our results showed a decline in the density and biomass proportions of Cladocera and Copepoda, contrasted by increases in those of Protozoa and Rotifera from Group I to III, alongside a rise in the Trophic Level Index, indicating progressive eutrophication. A composite diversity index, derived from the diversity indices of Shannon-Weiner, Pielou, and Margalef by using Principal Component Analysis, revealed an increase in diversity from Group I to III, suggesting a gradual stabilization of the community structure. Redundancy Analysis identified water temperature (WT), chlorophyll-a (Chl-a), secchi depth (SD), orthophosphates (PO₄^3-), and dissolved oxygen (DO) as the primary environmental factors influencing zooplankton community structure. This study provides critical insights into the dynamics and environmental drivers of zooplankton community in these 15 lakes, offering a foundation for managing water eutrophication and facilitating the restoration of these aquatic ecosystems.

长江及其邻近湖泊形成了一个复杂的河湖生态系统，具有丰富的水生生物多样性，浮游动物是其中的关键组成部分。浮游动物在养分循环和能量流动中具有重要作用，也是反映水质和水生生态系统整体健康状况的重要指标。研究浮游动物群落结构随理化环境变化的变化，对理解湖泊水质变化具有重要意义。对长江中游15个浅水湖泊进行了调查。基于原生动物、轮虫、枝足类和桡足类的相对密度比，采用K-means聚类分析将湖泊划分为3个不同的类群（I - III）。结果表明，从类群ⅰ到类群ⅲ，枝足类和桡足类的密度和生物量比例呈下降趋势，而原生动物和轮足类的密度和生物量比例呈上升趋势，营养水平指数呈上升趋势，水体富营养化进程明显。基于Shannon-Weiner、Pielou和Margalef的多样性指数，采用主成分分析方法得出群落多样性指数，从第一类到第三类多样性呈增加趋势，群落结构趋于稳定。冗余分析表明水温（WT）、叶绿素-a （Chl-a）、潜深（SD）、正磷酸盐（PO43-）和溶解氧（DO）是影响浮游动物群落结构的主要环境因子。本研究为这15个湖泊浮游动物群落的动态和环境驱动因素提供了重要的见解，为管理水体富营养化和促进这些水生生态系统的恢复提供了基础。

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