Limnologica最新文献

{"title":"The first eco-assessment of thirteen lakes in the Lake Van Basin of Türkiye with phytoplankton metrics as indicators of environmental conditions","authors":"Abuzer Çelekli","doi":"10.1016/j.limno.2025.126283","DOIUrl":"10.1016/j.limno.2025.126283","url":null,"abstract":"<div><div>Lakes are increasingly vulnerable to anthropogenic pressures such as pollution, eutrophication, and climate change, leading to biodiversity loss and ecosystem degradation. This study employed phytoplankton-based metrics across two hydrological periods to evaluate species-environment interactions and assess the ecological status of thirteen lakes in the Lake Van Basin. Canonical correspondence analysis (CCA) showed a strong correlation (96.7 %) between phytoplankton assemblages and environmental stressors. The most influential factors affecting phytoplankton distribution were conductivity, total organic carbon, total suspended solids, total phosphorus, total nitrogen, and nitrate. The CCA clearly distinguished the soda lakes, Lakes Erçek and Sodalı, which were characterized by high conductivity, alkaline pH, and high total organic carbon, and hosted assemblages dominated by taxa tolerant to organic pollution and salinity. In contrast, Lake Hıdırmenteş supported phytoplankton communities adapted to elevated nutrient and turbidity levels, while the Ahlat Marshes were associated with species indicative of nitrogen enrichment<em>.</em> The MPTI−modified phytoplankton trophic index proved to be an effective tool for ecological assessment, showing a strong correlation with total phosphorus (r = 0.925, p &lt; 0.01). The MPTI indicated that Lakes Nemrut, Aygır, and Nazik had a high ecological status, whereas Lakes Erçek, Hıdırmenteş, and Adırum showed a poor status and Lakes Turna and Hasantimur had a moderate one. This first eco-assessment of the region underscores the value of phytoplankton as sensitive indicators of environmental stress and supports the application of the MPTI for ecological status classification in saline and freshwater lakes of the Lake Van Basin.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"115 ","pages":"Article 126283"},"PeriodicalIF":2.0,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050224","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":"Interannual variability in dissolved organic matter (DOM) concentration and quality in shallow water bodies of Tierra del Fuego (Argentina)","authors":"Patricia E. Garcia ,&nbsp;Maria V. Castro ,&nbsp;María C. Maluendez Testoni ,&nbsp;Patricia Rodríguez","doi":"10.1016/j.limno.2025.126282","DOIUrl":"10.1016/j.limno.2025.126282","url":null,"abstract":"<div><div>Dissolved organic matter (DOM) is a crucial component of the global carbon cycle, significantly influencing aquatic ecosystems through its quantity and quality, which are shaped by abiotic factors such as precipitation, runoff, and solar radiation. Recently, the role of winter conditions, particularly ice cover, has gained attention due to the ongoing biogeochemical processes that occur during this period. This study explores the effect of winter precipitations on DOM dynamics in humic shallow lakes and beaver ponds in Tierra del Fuego over two consecutive years. Higher accumulated precipitation in 2021 compared to 2022 led to differences in DOM properties. While dissolved organic carbon (DOC) levels were higher in 2022, likely due to concentration effects from reduced precipitation, shallow lakes and beaver ponds exhibited distinct responses. Absorbance-based (water color, SUVA and spectral slope) assessments revealed a slight increase in DOM molecular size in shallow lakes during 2022, whereas fluorescence-based indices (HIX and BIX) indicated greater humification in 2021 but fewer humic components, suggesting complex patterns of allochthonous DOM mobilization. These findings highlight the importance of precipitation regimes and runoff in shaping DOM dynamics in subantarctic aquatic systems, with significant contribution from the surrounding soils and vegetation.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"115 ","pages":"Article 126282"},"PeriodicalIF":2.0,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027735","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":"Reed between the lines: Terrestrial 3D laser scanning to assess recreational impacts on lakeshore vegetation","authors":"Nora Meyer ,&nbsp;Matthias Kunz ,&nbsp;Roman Mathias Link ,&nbsp;Goddert von Oheimb","doi":"10.1016/j.limno.2025.126279","DOIUrl":"10.1016/j.limno.2025.126279","url":null,"abstract":"<div><div>Swimming in lakes and spending time on the shore are popular summer activities, but as climate change continues and land use intensifies, pressure on lakeshore ecosystems is increasing. In particular, plants play an important role in these ecosystems by stabilizing the shoreline and providing habitat, but they suffer from trampling and destruction caused by human use. However, the effects of lakeshore recreation on plants are not well understood. To assess the impact of bathers on the reed bed and the area of the shoreline used for sunbathing, terrestrial laser scanning (TLS) was employed to analyze changes in the aboveground spatial distribution of plant material at very high spatial or temporal resolution. Measurements were taken before and after summer weekends at nine lakes in Brandenburg, Germany, and the occupancy status of voxels (i.e., cubic volume elements) in voxelized TLS point clouds of the lakeshore vegetation was compared. In addition, standardized visitor counts were conducted to determine the bathing sites' visitation rates. Over the course of a summer weekend, bathing and control sites displayed similar changes in total reed volume. The analysis has identified no clear relationship between the highly dynamic volume changes and the bathing activity along the gradient of visitor density that has been considered here. The variation of vegetation in the sunbathing area was generally small and showed no clear tendency for directed loss or gain after a weekend. As we studied established sites, the vegetation may have already adapted to human use. While the current visitor density and visitor behavior do not appear to be causing discernible changes, visitor management measures will be necessary if the intensity of use increases in the future.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"114 ","pages":"Article 126279"},"PeriodicalIF":2.0,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902326","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":"Exploratory modelling of wind-generated wave and current bottom stress and potential for sediment resuspension in small lakes","authors":"L.A. Morales-Marín ,&nbsp;J.R. French ,&nbsp;K.E. Lindenschmidt","doi":"10.1016/j.limno.2025.126267","DOIUrl":"10.1016/j.limno.2025.126267","url":null,"abstract":"<div><div>Although lakes are generally considered to function as long-term sediment sinks, remobilisation of bottom sediments can be significant and has implications for water quality and palaeoenvironmental analysis of lake sediment records. Wind-waves and wind-generated currents are the most important drivers of sediment resuspension but the complexity of their interaction and their intermittent nature complicate direct observation of these processes. This paper demonstrates a hybrid approach that combines a three-dimensional (3D) community hydrodynamic model (FVCOM) with a parameterised fetch-limited wind wave model to simulate the relative proportions of the lake bed subject to sediment resuspension under different meteorological conditions. Model validation and testing is undertaken for a small upland lake exposed to strong wind forcing. A series of exploratory model experiments indicate the dominance of wind-wave stresses over flow current stresses for wind speed <span><math><mo>≤</mo></math></span> 12 m s<span><math><mrow><msup><mrow></mrow><mrow><mo>−</mo></mrow></msup><mn>1</mn></mrow></math></span>. Accordingly, the ratio between wind-wave stresses and current stresses can be around 15 for low wind speeds, but this ratio tends non-linearly to 1 when wind speed increases because of the faster growth of current stresses. The analysis of wind direction scenarios under typical wind speed conditions indicate that wind waves would resuspend sediments over narrow downwind zones along the shores. At different depth ranges, wind-waves are only able to resuspend sediments in areas less than about 5 m in depth, whereas for current-induced stresses, the resuspended area is more extensive for intermediate depths (from 5 m to 15 m).</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"114 ","pages":"Article 126267"},"PeriodicalIF":2.0,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656931","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":"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}