Limnologica最新文献

{"title":"The early colonisation of experimental mesocosms: The role of active and passive dispersal mode","authors":"Lukáš Pfeifer ,&nbsp;Michal Šorf ,&nbsp;Vanda Šorfová","doi":"10.1016/j.limno.2025.126256","DOIUrl":"10.1016/j.limno.2025.126256","url":null,"abstract":"<div><div>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 <em>D. magna</em> 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. <em>D.</em> 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 <em>D. magna</em> in the soil-amended treatment resulted in a unique community structure, likely due to its grazing impact on the food web.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"113 ","pages":"Article 126256"},"PeriodicalIF":2.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrochemistry, microbial ecology and physiological-biochemical properties of isolated bacteria of Tyrma hot spring (Far East of Russia)","authors":"E.G. Lebedeva ,&nbsp;I.V. Bragin ,&nbsp;A.A. Pavlov ,&nbsp;D.A. Rusakova","doi":"10.1016/j.limno.2025.126255","DOIUrl":"10.1016/j.limno.2025.126255","url":null,"abstract":"<div><div>In this study, we investigated for the first time the geochemistry, abundance, diversity and some physiological and biochemical properties of cultured bacterial communities inhabiting the Tyrminskie thermal springs (Far East, Russia). The thermal waters from the Tyrma Spring are characterized by a low mineralization level (less than 0.25 g/L), an alkaline pH medium (pH=9.4) and a fluoride (up to 10 mg/L) and bicarbonate sodium-based composition. In these thermal waters and associated microbial mats, low numbers of physiological groups of microorganisms were noted, with a predominance of heterotrophically active nitrifying bacteria in the water and silicate- and sulfate-reducing bacteria in the mats. The average air temperature during the winter was −7°C. The temperature of the spring water during sampling was recorded between 31.8 and 36.8°C. These temperatures favor the presence of mesophilic and thermotolerant microorganisms in the thermal waters, which is consistent with the identified bacterial genera. Bacterial strains isolated from the thermal waters were identified using the 16S rRNA gene. The isolated bacterial strains belong to the phyla <em>Firmicutes, Proteobacteria</em> and <em>Actinobacteria</em>. Bacterial strains of thermal waters were represented by the genera <em>Bacillus, Ochrobactrum, Brevibacterium, Achromobacter</em>. Shannon and Simpson ecological indices showed low bacterial diversity and their uniform distribution in the community. It should be noted that this assay is based solely on cultured microorganisms using standard culture media. According to canonical correspondence analysis the greatest influence on bacterial diversity was exerted by the elements: calcium, sodium, fluorine, and hydrocarbonates. The isolated bacteria were able to metabolize a wide range of carbohydrates and alcohols, although they fermented lactose poorly. Cultures of the <em>Bacillus</em> genus show the greatest sugar-metabolizing activity. The isolates are capable of producing extracellular enzymes, indicating their potential industrial applications.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126255"},"PeriodicalIF":2.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aquatic hyphomycetes show pollution-induced community tolerance in nitrogen enrichment experiment","authors":"Enzo V. Pereyra ,&nbsp;Sebastián Kravetz ,&nbsp;Julieta Lucero ,&nbsp;Luciana Cibils-Martina","doi":"10.1016/j.limno.2025.126254","DOIUrl":"10.1016/j.limno.2025.126254","url":null,"abstract":"<div><div>Freshwater ecosystems face significant threats worldwide, particularly from land use changes that impact biodiversity and ecosystem functions in rivers and streams. Essential elements such as carbon, nitrogen, and phosphorus play crucial roles in these ecosystems by directly influencing microbial activity and organic matter processing. This study examines the impact of increased nitrogen levels on the diversity and reproduction of aquatic hyphomycetes associated with decomposing leaf litter in the Chocancharava River, Córdoba, Argentina. Through a microcosm experiment, the objectives were to identify colonizing fungal species, analyze structural variables of the fungal community, and assess variations in sporulation rates and leaf litter decomposition rates of <em>Salix</em> sp<em>.</em> Contrary to expectations, no significant differences in fungal community structure were observed between the control and nutrient-enriched treatments. The increased nitrogen concentrations did not enhance fungal community growth, suggesting possible adaptation to chemical stressors consistent with the concept of pollution-induced community tolerance. These findings provide valuable insights into aquatic ecosystem resilience to nutrient enrichment, highlighting the importance of understanding microbial responses for effective ecosystem management.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126254"},"PeriodicalIF":2.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Reproductive ecology of three rheophilic fish species in the Austrian Danube River system: Insights into the spawning of Chondrostoma nasus, Barbus barbus, and Vimba vimba, and the larval development of C. nasus in the River Traisen” [Limnologica 112 (2025) 126250]","authors":"Daniel Pelz ,&nbsp;Thomas Friedrich ,&nbsp;Bernhard Zeiringer ,&nbsp;Thomas Hein ,&nbsp;Günther Unfer","doi":"10.1016/j.limno.2025.126257","DOIUrl":"10.1016/j.limno.2025.126257","url":null,"abstract":"","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126257"},"PeriodicalIF":2.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Macroalgal (Spirogyra) nutrient and chlorophyll stoichiometric response to nutrient concentrations in a tropical river","authors":"Simon Townsend","doi":"10.1016/j.limno.2025.126253","DOIUrl":"10.1016/j.limno.2025.126253","url":null,"abstract":"<div><div>A tenet of ecological stoichiometric theory is that autotroph stoichiometry is normally responsive to the variable supply of environmental resources of nutrients and light. The extent of autotroph stoichiometric plasticity is likely to vary with environmental resource variability, autotroph species, growth form and physiological needs. A field study was conducted in the Daly River catchment in the Australian wet/dry tropics to test the hypothesis that the carbon (C), nitrogen (N), phosphorus (P) and chlorophyll <em>a</em> (Chl<em>a</em>) stoichiometry of the riverine, filamentous macroalga <em>Spirogyra fluviatilis</em> is responsive to concentrations of dissolved inorganic nitrogen (DIN), dissolved phosphorus and light, as well as temperature which can influence autotroph stoichiometry indirectly. Linear regressions were undertaken between stoichiometric dependent variables and independent environmental variables. With increased DIN concentrations, <em>S. fluviatilis</em> percentage content of N, C and Chl<em>a</em> and molar N:P ratios increased, whilst C:Chl<em>a</em> ratios decreased. No effect of light or temperature on algal stoichiometry was detected. The regressions, however, only explained one-third or less of <em>S. fluviatilis</em> stoichiometric variability, due most probably to methodological constraints, cell nutrient storage and uptake dynamics, and possibly undetected light and temperature effects. <em>S. fluviatilis</em> demonstrated N plasticity in response to DIN concentrations, to enrich the alga with N under relatively high DIN concentrations, enhancing its nutritional quality for herbivores and omnivores. This study complements others which have demonstrated macroalgal P plasticity. Stoichiometric variables can be used to monitor the impact of nutrient pollution and identify the stoichiometric basis for ecosystem-wide implications of nutrient pollution.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126253"},"PeriodicalIF":2.0,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143882138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal variation of zooplankton community structure between two subtropical reservoirs of contrasting hydraulic retention time","authors":"Julieta Cuevas,&nbsp;Guillermo Chalar,&nbsp;Sol De Giacomi,&nbsp;Mauricio González-Piana,&nbsp;Carmela Carballo","doi":"10.1016/j.limno.2025.126249","DOIUrl":"10.1016/j.limno.2025.126249","url":null,"abstract":"<div><div>Reservoirs significantly influence aquatic ecosystems by modifying river flows and forming artificial lakes. This study examines the zooplankton communities in two Uruguayan connected reservoirs, Bonete and Baygorria, focusing on the impact of different water residence times. Upstream Bonete has a long retention time of 140 days, whereas Baygorria has a short retention time of 3 days. The investigation was conducted over 2019–2020, involving ten sampling events at three depths. Physical and chemical variables, including temperature, dissolved oxygen, pH, turbidity, chl-a, total nitrogen, total phosphorus, and organic matter concentrations were measured. Zooplankton biomass and community structure were analyzed through Redundancy Analysis (RDA). Results indicated higher zooplankton biomass in Bonete, with significant seasonal and vertical variations linked to environmental factors. Temperature, chl-a concentration, and water residence time were identified as key determinants. The study highlights the role of water residence time in shaping zooplankton communities. The findings underscore the need for tailored management strategies to address the ecological dynamics of reservoirs.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126249"},"PeriodicalIF":2.0,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short-term and seasonal dynamics of planktonic protist community (Alveolata, Ciliophora) in a neotropical urban lake, Maringá - Paraná, Brazil","authors":"Matheus Henrique de Oliveira de Matos ,&nbsp;Loiani Oliveira Santana ,&nbsp;Felipe Rafael de Oliveira ,&nbsp;Melissa Progênio ,&nbsp;Edilaine Corrêa Leite ,&nbsp;João Vitor Bredariol ,&nbsp;Luiz Felipe Machado Velho","doi":"10.1016/j.limno.2025.126251","DOIUrl":"10.1016/j.limno.2025.126251","url":null,"abstract":"<div><div>The aim of this study was to investigate the temporal dynamics of planktonic ciliate communities, based on daily fluctuations between different hydrological periods in a eutrophic urban lake located in the city of Maringá, Paraná, Brazil. We hypothesized that abundance would vary more between collection days than between hydrological periods, whereas richness and selection would vary more between hydrological periods than collection days. Ciliated protists were sampled during two distinct hydrological periods: a dry period in September 2018 and a rainy period in January 2019. Sampling was conducted 10 times during each period, with collections every 3 days over 30 days. Throughout the study, 84 morphospecies were recorded. The Prostomatida group dominated in both periods, contributing to 37.1 % of the total abundance in the dry season and 74 % in the rainy season. Other representative groups included Peritrichia (35.7 % in the dry season) and less abundant taxa such as Nassulida, Colpodea, and Cyrtophorida (8.5 % in the rainy season). Abundance varied significantly in the short term (i.e. between sampling days) and between hydrological periods (dry and rainy), with higher values during the rainy season (mean ± SE: 1250 ± 150 Ind.L⁻¹) compared to the dry season (mean ± SE: 850 ± 120 Ind.L⁻¹). Differences in richness were not significant between the hydrological periods. However, there was significant daily variation during the rainy season. Species composition differed only between hydrological periods, as predicted. This study shows that the hydrological regime significantly influences ciliate communities, with variations in richness, abundance, and composition occurring over short periods. Therefore, it is recommended that these organisms be analyzed continuously, across short intervals, and seasonally. This approach is necessary because their responses to environmental monitoring may vary depending on the sampling period, given their high sensitivity to environmental changes.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126251"},"PeriodicalIF":2.0,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reproductive ecology of three rheophilic fish species in the Austrian Danube River system: Insights into the spawning of Chondrostoma nasus, Barbus barbus, and Vimba vimba, and the larval development of C. nasus in the River Traisen","authors":"Daniel Pelz ,&nbsp;Thomas Friedrich ,&nbsp;Bernhard Zeiringer ,&nbsp;Thomas Hein ,&nbsp;Günther Unfer","doi":"10.1016/j.limno.2025.126250","DOIUrl":"10.1016/j.limno.2025.126250","url":null,"abstract":"<div><div>This study investigates the reproductive ecology of three rheophilic fish species (<em>Chondrostoma nasus, Barbus barbus</em> and <em>Vimba vimba</em>) in the River Traisen, Austria. The main objectives were to describe the spawning sites of these species and to describe the development of nase eggs and larvae in situ. The study also examines the immigration patterns from the Danube into the Traisen in relation to discharge and water temperature. The fieldwork was carried out between March and June 2020 in the lower reaches of the Traisen (11 km renaturalized river section and 4 km residual water section). In addition to visual counts, a drone (UAV) and underwater cameras were used to quantify and document spawning behavior. At the spawning sites the parameters water depth, flow velocity, temperature and substrate type were recorded. The spawning site characteristics of nase and barbel were consistent with previous studies. The vimba bream spawned at a water temperature of 13–17 °C, a water depth of 39 ± 9 cm and a flow velocity of 93 ± 19 cm/s and was described for the first time for a Central European river population. The development of the nase from eggs to fry was documented in the field; the incubation of the eggs lasted 30 days with a mean water temperature of 11.4 °C. Only a few barbel and vimba bream used the restored section for spawning, the majority of both and all nase spawned in the residual flow stretch upstream, where they were prevented from migrating further due to the low discharge.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126250"},"PeriodicalIF":2.0,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrogen transformation and microbial community interactions in hydrodynamic heterogeneous hyporheic zone sediment: Insights for ecosystem sustainability","authors":"Abdulhamid Yusuf ,&nbsp;Duan Lei ,&nbsp;Yaqiao Sun ,&nbsp;Shuo Duan ,&nbsp;Yunzeng Zhang","doi":"10.1016/j.limno.2025.126252","DOIUrl":"10.1016/j.limno.2025.126252","url":null,"abstract":"<div><div>The hyporheic zone (HZ) plays a critical role in nitrogen transformation, yet the impact of hydrodynamic variability on microbial community dynamics within HZ sediments remains poorly understood. This study investigates how different hydrodynamic conditions affect microbial communities in HZ sediments using a simulation device to analyze groundwater-surface water interactions. Results indicate a significant reduction in nitrate (NO₃⁻) concentrations, with decreases of 93.81 % under upwelling (from 4.68 mg/L to 0.30 mg/L) and 91.05 % under downwelling conditions (from 6.2 mg/L to 0.55 mg/L). Concurrently, peaks in nitrite (NO₂⁻) concentrations were observed during denitrification processes (P &lt; 0.05). High-throughput sequencing revealed diverse bacterial communities, predominantly consisting of <em>Proteobacteria</em> (40–46 % relative abundance) and <em>Actinobacteria,</em> with downwelling sediments exhibiting greater microbial richness (ACE index) compared to upwelling sediments (P &lt; 0.05). The Shannon diversity indices showed mean values of 6.17 for downwelling and 5.81 for upwelling sediments. These findings demonstrate that hydrodynamic conditions significantly influence both microbial community structure and nitrogen transformation processes, underscoring the microbial role in biogeochemical processes of nitrogen cycling. Future research should examine the long-term effects of hydrological fluctuations on microbial dynamics in the HZ to enhance our understanding of ecosystem sustainability.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126252"},"PeriodicalIF":2.0,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variations of zooplankton community as bioindicators of eutrophication and water quality in shallow Yangtze Lakes","authors":"Jiangqianhui Qi ,&nbsp;Yang Wang ,&nbsp;Jing Yuan ,&nbsp;Chuansong Liao ,&nbsp;Jiashou Liu ,&nbsp;Chuanbo Guo","doi":"10.1016/j.limno.2025.126248","DOIUrl":"10.1016/j.limno.2025.126248","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"112 ","pages":"Article 126248"},"PeriodicalIF":2.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}