Limnologica最新文献

{"title":"Soil particles and elevation shape the distribution of prokaryotic communities in Poyang Lake","authors":"Yajun Liu ,&nbsp;Hui Zhong ,&nbsp;Mi Deng ,&nbsp;Zeyong Chi ,&nbsp;Xiangmin Liu ,&nbsp;Rongfu Li ,&nbsp;Yongming Wu","doi":"10.1016/j.limno.2025.126268","DOIUrl":"10.1016/j.limno.2025.126268","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"113 ","pages":"Article 126268"},"PeriodicalIF":2.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523049","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":"Chironomidae communities from the Mazafran watershed as bioindicators of water quality and biodiversity with implications for global freshwater ecosystems","authors":"Ghiles Smaoune ,&nbsp;Ibrahim Yahiaoui ,&nbsp;Imane Saal ,&nbsp;Djaouida Bouchelouche ,&nbsp;Nassima Doukhandji ,&nbsp;Ceria Hamache ,&nbsp;Qiang Zhang","doi":"10.1016/j.limno.2025.126266","DOIUrl":"10.1016/j.limno.2025.126266","url":null,"abstract":"<div><div>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 <em>Orthocladius rubicundus</em> 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.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"113 ","pages":"Article 126266"},"PeriodicalIF":2.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518002","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":"Nuanced effects of organic matter on native phytoplankton and non-native Ceratium: A case study re-analyzing field data using non-linear thresholds","authors":"Rafael Lacerda Macêdo ,&nbsp;Ana Clara Sampaio Franco","doi":"10.1016/j.limno.2025.126265","DOIUrl":"10.1016/j.limno.2025.126265","url":null,"abstract":"<div><div>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 <em>Ceratium</em> 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 <em>Ceratium</em> showed tolerance, possibly through heterotrophic carbon assimilation. Overall, native taxa decline at 4.9 mgL^-1 whereas <em>Ceratium</em> 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.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"113 ","pages":"Article 126265"},"PeriodicalIF":2.0,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491316","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":"Distribution of zooplankton functional groups in a tropical reservoir and their relationship with the trophic state index","authors":"Renato Miziara Assef dos Santos ,&nbsp;Maria José dos Santos-Wisniewski ,&nbsp;Odete Rocha","doi":"10.1016/j.limno.2025.126264","DOIUrl":"10.1016/j.limno.2025.126264","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"113 ","pages":"Article 126264"},"PeriodicalIF":2.0,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144308185","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":"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}