Limnologica最新文献

{"title":"Suitability of wild decapods from an alluvial valley in South America for human nutrition as derived by amino acid composition","authors":"Magali Petean ,&nbsp;Pablo Collins ,&nbsp;Maria Eugenia D’Alessandro","doi":"10.1016/j.limno.2025.126223","DOIUrl":"10.1016/j.limno.2025.126223","url":null,"abstract":"<div><div>Decapods are abundant in freshwater environments of tropical and subtropical rivers and could be considered a good resource for human feeding. The present study evaluated the nutritional quality of decapods in relation to amino acid (AA) composition and compared them with human requirements, and with the AA patterns of some crustaceans and fishes commonly consumed by human people around the world. Prawn and crab (<em>Macrobrachium borellii</em> and <em>Aegla uruguayana,</em> respectively) from the Parana River Basin were sampled. Catch effort and volume were also calculated according to the sampled area. AA was determined by high-performance liquid chromatography. Sixteen AA were identified in muscle; eight were essential amino acids for humans (EAA), and the others were non-essential amino acids (NEAA). Of the total AA, 38.0 % of those from <em>M</em>. <em>borellii</em> and 39.8 % from <em>A</em>. <em>uruguayana</em> were EAA. The NEAA values were 62.0 % for <em>M</em>. <em>borellii</em> and 60.2 % for <em>A</em>. <em>uruguayana</em>. Lipid content was close to 1 % of the biomass in wet weight in both species. When comparing decapod AA profiles with those from marine and freshwater crustacean and fishes used as food (giant river prawn, amazon river prawn, longarm river prawn, southern king crab, green tiger shrimp, speckled shrimp, tuna, sardine, hake, carp, trout, jundía catfish), the values of Leucine and Lysine in the decapods were found to be higher or equal. The amount of tyrosine in <em>M</em>. <em>borellii</em> and <em>A</em>. <em>uruguayana</em> was higher than in freshwater fishes. Nutritionally, both species are good quality food and could serve as a functional resource for the feeding of humans, nevertheless, they are not yet marketed.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"110 ","pages":"Article 126223"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129953","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":"Discovery of the Asian clam Corbicula sp. form A in Ensenada, Baja California through conventional taxonomy and innovative shell dna whole genome amplification","authors":"Jorge Cáceres-Martínez ,&nbsp;Roberto Cruz-Flores ,&nbsp;Edna Naranjo-García ,&nbsp;Miguel Ángel Del Río-Portilla ,&nbsp;Rebeca Vásquez-Yeomans","doi":"10.1016/j.limno.2024.126222","DOIUrl":"10.1016/j.limno.2024.126222","url":null,"abstract":"<div><div>Ensenada, Baja California is characterized by intermittent runoff occurrences, typically limited to the rainy season, and scarce hot springs, devoid of documented native freshwater clam populations. Notably, the region encompasses the 'Emilio López Zamora' reservoir, vital for water storage and urban supply. However, an unexpected phenomenon unfolded during the dry season of 2021: a substantial accumulation of deceased freshwater clam shells was serendipitously discovered along a stretch of sandy reservoir bed. The goals of this study were to determine the identity of the clam, analyze its possible origin and consider its potential control/use. A sampling of 100 these shells was carried out to perform morphological and molecular identification. Morphological identification was carried out using conventional malacological techniques of taxonomy based on shell morphology. Molecular identification was conducted by extracting DNA from both the shell and periostracum of deceased clams, employing whole-genome amplification (WGA) in conjunction with PCR and sequencing techniques. The integration of classic malacological methods with molecular analysis unequivocally confirmed the lineage of the clam as <em>Corbicula</em> sp. form A. This is the first record of this invasive species in the city of Ensenada, Baja California. The WGA method demonstrated its efficacy in identifying deceased mollusks when only the shell remains, and nucleic acid availability is constrained. The origin of the clam within the reservoir remains elusive, underscoring the need for future investigations to delve into its potential for biomonitoring, bioremediation, and aquaculture applications.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"110 ","pages":"Article 126222"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129955","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":"Ecosystem engineering at the regional scale—Beaver impact on floodplain pondscapes","authors":"Ivan W. Bashinskiy ,&nbsp;Ekaterina N. Andriushkevich ,&nbsp;Nikita G. Kadetov ,&nbsp;Vitaly V. Osipov","doi":"10.1016/j.limno.2024.126214","DOIUrl":"10.1016/j.limno.2024.126214","url":null,"abstract":"<div><div>Currently, global climate change has led to alterations in river discharge. In Eastern and Southern Europe, decreasing spring flood levels are observed, leading to drying and overgrowth of floodplain water bodies, especially in semiarid regions. Under such conditions, the scale of influence of the ecosystem engineer, the Eurasian beaver, which is often considered one of the tools for wetland restoration, is of interest. The aim of this study was to analyze beaver digging activity on a regional scale by estimating beaver abundance and occurrence patterns in floodplain pondscapes of the upper Khoper River and by quantifying changes in the morphometric parameters of water bodies due to the impact of this species. During the field survey and remote GIS analysis, 80 water bodies were surveyed. The results of the field study revealed that 67 % of the water bodies were inhabited by beavers, 21 % of which were inhabited by large families. Only 5.6 % of the water bodies had no traces of beaver activity. Approximately 30 % of all the water bodies under study were significantly altered, and 10–13 % were almost completely excavated by beavers. The remote sensing analyses revealed that beavers digging increased the area of the water bodies by an average of 40 %, the perimeter of the water bodies by an average of 60 %, and the shoreline development (complexity) by 60 %. In total, beaver-created structures occupied 0.05 km² in the floodplain of the upper reaches of the river, and their total length reached 30.5 km. The main factor influencing beaver digging activity was the drying of water bodies; the values of morphometric parameters altered or created by beavers increased significantly at large differences in the maximum and minimum water levels. Our results highlight the importance of ecosystem engineering activities at the regional scale in the face of climate change and provide insight into the possibility of considering beaver digging activities as an inspiration for the development of nature-based strategies.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"109 ","pages":"Article 126214"},"PeriodicalIF":2.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653891","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, community structure and metabolic potential of bacterioplankton in a small boreal lake: Microscopy-based survey and 16S rRNA-based DNA metabarcoding","authors":"Maria Yu. Skopina ,&nbsp;Elizaveta V. Kuznetsova ,&nbsp;Denis V. Tikhonenkov ,&nbsp;Haihan Zhang ,&nbsp;Elena A. Gerasimova ,&nbsp;Alexander I. Tsvetkov ,&nbsp;Dmitry B. Kosolapov","doi":"10.1016/j.limno.2024.126213","DOIUrl":"10.1016/j.limno.2024.126213","url":null,"abstract":"<div><div>Bacteria are numerous and diverse organisms that have a significant impact on the functioning of aquatic ecosystems. On the vast territory of the West Siberian Lowland (Russia) there are many rivers, lakes and bogs, the microbial communities of which are almost unexplored. Here, we report the study results on the distribution, diversity, community structure and functions of bacterioplankton in the pelagic and littoral zones of one of the lakes, located in this region (Lake Kuchak) obtained using microscopic techniques and 16S rRNA gene metabarcoding. The high total bacterial abundance and biomass, the diversity indices, and the high number of Actinobacteria amplicon sequence variants (ASVs), along with the relatively low number of Betaproteobacteria ASVs, indicate the eutrophication of the lake, especially in its overgrown littoral zone. Similar bacterial communities developed in the pelagic and littoral zones due to similar environmental conditions in these habitats of this small and shallow lake. Nevertheless, there were some differences between the pelagic and littoral zones, causing differences in the bacterial communities of these zones more in size and morphological structure than in taxonomic composition. Comparative analysis of the bacterial metabolic ways showed the higher functional potential in the pelagic zone compared to the littoral one. Signs of methylotrophic and methanotrophic activities, as well as pollutant biodegradation potential of the bacterioplankton were identified. The bacterial distribution and community composition indicates the input of organic substances into the lake from the watershed, but also shows the community resistance to allochthonous microorganisms. Alpha diversity indices, distribution of taxonomic groups and some other results indicate deterioration of water quality in the overgrown littoral zone.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"109 ","pages":"Article 126213"},"PeriodicalIF":2.0,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142534747","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":"Population dynamics of planktonic and symbiotic Vibrio spp. associated with the freshwater invasive snail Physa acuta (Gastropoda: Physidae) in Wouri estuary (Douala, Cameroon)","authors":"Ernest Koji ,&nbsp;Paul Alain Nana ,&nbsp;Siméon Tchakonté ,&nbsp;Fils Mamert Onana ,&nbsp;Antoine Arfao Tamsa ,&nbsp;Sylvie Chinche Belengfe ,&nbsp;Richard Mbelle Ekwa ,&nbsp;Ornella Eunice Wandji Kweya ,&nbsp;Moïse Nola","doi":"10.1016/j.limno.2024.126211","DOIUrl":"10.1016/j.limno.2024.126211","url":null,"abstract":"<div><div>In Cameroon, the coastal city of Douala is seriously confronted with major epidemics of waterborne diseases, especially cholera, caused by pathogenic bacteria. However, the related environmental factors are poorly understood. This study aimed to investigates the population dynamics of planktonic and symbiotic <em>Vibrio</em> spp. associated with the freshwater invasive snail <em>Physa acuta</em> in Wouri estuary, focusing on the impact of selected abiotic factors. Abiotic parameters were analyzed using standardardized methods. Microbiological analyses involved isolating, identifying and counting planktonic and symbiotic <em>Vibrio</em> spp. cells associated with <em>Physa acuta</em>. The Wouri Estuary streams exhibit hypoxia, with dissolved oxygen levels as low as 1 % at certain stations and characterized by high organic matter loads. Total symbiotic <em>Vibrio</em> spp<em>.</em> abundance peaked during the rainy season and increased from freshwater saltwater gradient. The survival of both planktonic and symbiotic <em>Vibrio</em> spp. cells associated with <em>Physa acuta</em> is influenced by several abiotic factors including precipitation, salinity, suspended solids and dissolved organic matter. The species of <em>Vibrio</em> spp. potentially pathogen to human were isolated in both planktonic and symbiotic forms. <em>Vibrio parahaemolyticus</em> was provisionally identified in this study as indigenous to <em>Physa acuta</em>, while <em>V. alginolyticus</em>, <em>V. vulnificus, V. cholerae</em>, <em>V. fluvialis</em> and <em>V. mimicus</em>, which may be responsible for public health problems, are present accidentally in both study environments. All the evidence suggests that the bacteria present in the digestive tract of <em>Physa acuta</em> accumulate indiscriminately from the natural environment and constitute transient populations. Based on this study, decisions on the management of public health problems can be envisaged to avoid the emergence and re-emergence of certain zoonotic diseases.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"109 ","pages":"Article 126211"},"PeriodicalIF":2.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432090","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":"First use of Chironomid Pupal Exuvial Technique in freshwater biomonitoring in Cameroon: Ecological aspect and morphological description of Chironomidae (Insecta: Diptera)","authors":"Simeon Tchakonte ,&nbsp;Ernest Koji ,&nbsp;Nectaire Lie T. Nyamsi ,&nbsp;Paul-Alain Nana ,&nbsp;Raoul Kayo Tuekam ,&nbsp;Antoine Arfao Tamsa ,&nbsp;Mamert Fils Onana ,&nbsp;Gideon Aghaindum Ajeagah","doi":"10.1016/j.limno.2024.126212","DOIUrl":"10.1016/j.limno.2024.126212","url":null,"abstract":"<div><div>The biodiversity of urban streams is gradually degrading as a result of anthropogenic pollution. In this study, chironomid pupal exuviae were used as surrogates to assess urban streams and a lake in Douala Cameroon. We compared these assessments with samples collected from a suburban forest stream. Based on their highly adaptive capability, we predicted that chironomid communities would present high diversity and abundance in urban habitats. Chironomid pupal exuviae were collected using the chironomid pupal exuvial technique in 14 urban and 2 forest reference stations during dry and rainy seasons. Measurements of the environmental variables were done simultaneously. Physicochemical analysis revealed that all urban sites have had very poor ecological health status whereas forest site had good water quality as shown by the hierarchical cluster analysis. This ecological survey identified 8 species/morphotypes of chironomids all belonging to the subfamily Chironominae, tribe Chironomini. These are <em>Chironomus holomelas</em>(?), <em>Chironomus</em> sp.1, <em>Chironomus</em> sp.2, <em>Chironomus</em> sp.3, <em>Chironomus (Lobochironomus)</em> sp., <em>Stenochironomus</em> sp., <em>Dicrotendipes</em> sp. and <em>Dicrotendipes pulsus</em>. No midge pupal exuviae were recorded at the forest stations (S₁ &amp; S₂) and the stations S₆ and S₇ located downstream industrial mill effluents. The species richness of the study sites was significantly very low as compare to other Afrotropical studies. Canonical redundancy analysis revealed that high values of water temperature, ammonium, nitrates and phosphates, and low oxygen concentration were significant predictors of the distribution and high abundance of Chironomidae. This survey highlighted the impacts of anthropogenic activities on chironomid diversity and distribution, with great decrease of their diversity due to industrial pollution.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"109 ","pages":"Article 126212"},"PeriodicalIF":2.0,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432091","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":"Local factors drive leaf breakdown in tropical streams","authors":"Guilherme Sena ,&nbsp;Marcos Callisto ,&nbsp;Renan de Souza Rezende ,&nbsp;José F. Gonçalves Júnior","doi":"10.1016/j.limno.2024.126202","DOIUrl":"10.1016/j.limno.2024.126202","url":null,"abstract":"<div><p>Plants of riparian forests provide abundant dead leaves for freshwater stream ecosystems which support detritus-based food webs. The increased replacement from natural riparian forests to <em>Eucalyptus</em> plantations, an exotic species distributed throughout the neotropic landscapes, alters leaf breakdown as a key ecosystem process. We evaluate the breakdown of native and exotic leaf species with distinct physical and chemical characteristics (traits) in two different tropical reference condition streams located in Cerrado and Atlantic Forest biomes. We tested the hypothesis that regardless of the leaves’ origin (native or non-native species), leaf litter with higher nutrients and less recalcitrant compounds has higher decay rates. <em>Eucalyptus camaldulensis</em> leaf breakdown was faster than the native species <em>Miconia chartacea</em> in both streams. Leaf breakdown was driven by local characteristics (context dependent) and the macrodecomposer community, with more intensity to the litter's intrinsic physical and chemical quality. The higher leaf breakdown of <em>E. camaldulensis</em> was evidenced in the Atlantic Forest stream, that with the most increased water flow, further accelerating the leaf breakdown. Our findings indicate that due to the innate physical and chemical characteristics of <em>E. camaldulensis</em>, its decomposition occurs at a faster rate compared to native tropical species, as evidenced by the stream flows.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"109 ","pages":"Article 126202"},"PeriodicalIF":2.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238090","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":"Combined effects of food quality and temperature on competitive interactions between small- and large-bodied cladoceran species","authors":"Irina Yu. Feniova ,&nbsp;Tomasz Brzeziński ,&nbsp;Andrew R. Dzialowski ,&nbsp;Varos G. Petrosyan ,&nbsp;Anna Bednarska ,&nbsp;Natalia S. Zilitinkevicz ,&nbsp;Piotr Dawidowicz","doi":"10.1016/j.limno.2024.126203","DOIUrl":"10.1016/j.limno.2024.126203","url":null,"abstract":"<div><p>Competition is one of the main drivers of population dynamics of cladoceran species. According to the Size Efficiency Hypothesis, large-bodied cladocerans are superior competitors over small-bodied species because they are more effective filter-feeders and can consume a wider size spectrum of food particles. However, we hypothesized that food quality in terms of phosphorus (P) and/or polyunsaturated fatty acid (PUFA) content can alter competitive interactions, and these potential effects can be modified by temperature. Since large-bodied cladocerans are more vulnerable to poor food quality and are regarded as less adaptive to high temperatures, we hypothesized that large-bodied species would be superior competitors at low temperature and/or high food quality, while small-bodied cladocerans would be competitively superior at enhanced temperature and/or poor food quality. To verify this hypothesis, we conducted laboratory experiments with the small-bodied <em>D. longispina</em> and large-bodied <em>D. magna</em> fed with three different types of food: (1) P-poor and PUFA-rich green algae (low phosphorus or LP-treatment), (2) PUFA-poor-cyanobacteria treatment (CYANO) and (3) P-rich and PUFA-rich green algae (high phosphorus or HP-treatment) at 18°C and 24°C. We found that <em>D. magna</em> had a stronger suppressive competitive effect on <em>D. longispina</em> in all food quality and temperature treatments. Nevertheless, food quality and temperature modified competitive interactions between the small- and large-bodied <em>Daphnia</em>. In HP and CYANO, both <em>Daphnia</em> species were more strongly suppressed by competitor presence at high than low temperatures, whereas in LP mutual suppression was relatively weaker at higher temperatures. This phenomenon was attributed to higher requirement for P at enhanced temperature which created constraints for population growth thus decreasing competitive interactions at higher temperatures. Mutual competitive suppression in CYANO was weaker than in the HP treatment although cyanobacteria had the greatest negative impact on the abundance of both <em>Daphnia</em> species. In general our results show that the outcome of competition between large and small-bodied cladoceran species was not affected by food quality and/or temperature, yet, these factors markedly altered competitive interactions between species.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"109 ","pages":"Article 126203"},"PeriodicalIF":2.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142229514","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":"Spatial and seasonal dynamics of zooplankton functional groups and their relationship with environmental factors in urban rivers in Haikou City, China","authors":"Eunice Mutethya ,&nbsp;Edwine Yongo ,&nbsp;Liu Qi ,&nbsp;Liu Xiaojin ,&nbsp;Zhiqiang Guo ,&nbsp;Ye Changqing","doi":"10.1016/j.limno.2024.126200","DOIUrl":"10.1016/j.limno.2024.126200","url":null,"abstract":"<div><p>The urban rivers, including Changwang, Meishe, and Wuyuan in Haikou City, China, are vital water resources. Despite the rivers experiencing anthropogenic impacts, limited studies have investigated their water quality and ecological community structure. This study assessed zooplankton functional groups' spatial and seasonal dynamics relative to environmental factors in the three urban rivers. The samples were collected and analyzed seasonally between March and December 2019. The environmental factors varied significantly at spatial and seasonal scales (<em>p</em> &lt; 0.05). Meishe and Wuyuan Rivers had higher electrical conductivity, salinity, TN, and TP than Changwang, which had low turbidity. Seasonally, higher TP, TN, NH₃-N, and COD_Mn levels were found in the spring, while summer and autumn experienced high temperatures. Additionally, spring and summer had high Chl-<em>a</em> levels. Likewise, spring had the lowest heavy metal concentrations, while nearly all metals were elevated in winter and summer. Generally, the average metal content followed the order of Mn &gt; Zn &gt; Cu &gt; Ni &gt; As &gt; Cr &gt; Co &gt; Pb &gt; Cd. The environmental parameters were within class III of the China standard for surface waters (GB 3838–2002), suggesting negligible pollution. This study identified 159 zooplankton species, including 62 Rotifers, 50 Protozoans, 31 Cladocerans, and 16 Copepods. They were classified into 11 functional groups, dominated by Rotifers filter feeders (RF), Rotifers carnivores (RC), and small copepods and cladocerans filter feeders (SCF), followed by Middle copepods and cladocera carnivores (MCC) and Middle copepods and cladocerans filter feeders (MCF). Analysis of similarity (ANOSIM) revealed seasonal differences (<em>p</em> &lt; 0.001) in zooplankton functional groups, with RF and RC most dominant in summer, autumn, and winter, while SCF, MCF, and MCC were dominant in spring. Hence, the redundancy analysis (RDA) and Pearson Correlation analysis revealed that temperature, Chl-<em>a</em>, TP, salinity, COD_Mn, NH₃-N, TN, As, Co, and Cd were the main environmental factors influencing zooplankton functional groups. This study helps understand urban rivers' water quality and ecological community structure, bridging the knowledge gap. The findings are essential for water quality monitoring and management.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"108 ","pages":"Article 126200"},"PeriodicalIF":2.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142098286","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":"Diversity and structure of prokaryotic assemblages in a thermally stratified tropical lake","authors":"Jesús Torres-Huesca ,&nbsp;Jazmín Santillán ,&nbsp;Yislem Beltrán ,&nbsp;Rafael A. López-Martínez ,&nbsp;Miroslav Macek ,&nbsp;Luisa I. Falcón ,&nbsp;Martín Merino-Ibarra ,&nbsp;Patricia M. Valdespino-Castillo ,&nbsp;Jesús T. Martínez-Díaz ,&nbsp;Javier Alcocer ,&nbsp;Rocío J. Alcántara-Hernández","doi":"10.1016/j.limno.2024.126201","DOIUrl":"10.1016/j.limno.2024.126201","url":null,"abstract":"<div><p>The structure and diversity of prokaryotic assemblages in inland waters are strongly related to their habitat. Yet, there is a lack of integrative studies surveying them in different compartments in tropical lakes. This study estimated the diversity and composition of prokaryotic assemblages in sediments, microbialites, and water column in the tropical warm monomictic Lake Alchichica and identified the most representative phylotypes while thermally stratified. The 16S rRNA gene survey showed a distinctive prokaryotic assemblage for each compartment, with 60–78 % of the phylotypes being unique to each one. Sediments accounted for the major prokaryotic diversity in the lake, with chemoorganotrophic bacteria and sulphate reducers as major biogeochemical components. Microbialites showed a high abundance of oxygenic and anoxygenic phototrophs, as well as organotrophs. The prokaryoplancton in the water column was mainly composed of picocyanobacteria and Flavobacteria in the epilimnion, shifting to a high diversity of anaerobic microorganisms in the hypolimnion. These water column assemblages were significantly correlated to pH, ORP, DO, and nutrient concentration. This study shows an integral view of the prokaryotic assemblages in a deep tropical lake related to physicochemical characteristics, from their diversity to their biogeochemical implications, suggesting the role of lake sediments as a possible microbial seed bank.</p></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"108 ","pages":"Article 126201"},"PeriodicalIF":2.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142149799","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}