Limnologica最新文献

{"title":"Adsorption performance and mechanism of HFO/pumice composites for phosphate in water","authors":"Jian Huang ,&nbsp;Xianjin Qiu ,&nbsp;Hua Zhang ,&nbsp;Chenxi Zhang ,&nbsp;Zhuoyi Lu ,&nbsp;Tao Luo ,&nbsp;Chunhua He ,&nbsp;Jiamei Zhang ,&nbsp;Zichen Shuai","doi":"10.1016/j.limno.2025.126237","DOIUrl":"10.1016/j.limno.2025.126237","url":null,"abstract":"<div><div>Excessive phosphorus is a principal cause of water eutrophication. Adsorption is an effective method for phosphorus removal. Yet there is little research on the adsorption performance and mechanism of phosphorus with HFO (hydrous ferric oxide)/pumice composites. In this study, the HFO/pumice composites were prepared, and the adsorption performance and mechanism of HFO/pumice composites for phosphorus were researched. The results indicated that the phosphorus adsorption performance reached a maximum value of 5.69 mg·g⁻¹ when the pH was 7. The adsorption performance increased with temperature. Moreover, when Cl^-, SO₄^2- and HCO₃^- coexisted, HCO₃^- had a greater effect on the adsorption performance of the HFO/pumice composites for phosphorus, and the adsorption performance decreased gradually with the increase of HCO₃^- concentration. The adsorption isotherms indicated that the Langmuir isotherm model was more suitable to describe the adsorption behavior of the HFO/pumice composites for phosphorus, and the correlation coefficient was 0.9785. In addition, the pseudo-second-order kinetic was more consistent with the adsorption mechanism of HFO/pumice composites for phosphorus. The internal diffusion model showed that the combination of external mass transfer and internal diffusion controlled the adsorption rate of the HFO/pumice composites for phosphorus. The experimental results showed that the adsorption mechanisms of HFO/pumice composites for phosphorus mainly involved pore filling, electrostatic interaction, and surface complexation.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"111 ","pages":"Article 126237"},"PeriodicalIF":2.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471190","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":"Adaptation of the biotic index for macroinvertebrates in tributaries of the Itacaiúnas River","authors":"J.S. Oliveira ,&nbsp;M.E.C. Liberal ,&nbsp;C.P. Leão ,&nbsp;M. Cruz ,&nbsp;J. Martins ,&nbsp;R.M. Siqueira ,&nbsp;B.S. Godoy","doi":"10.1016/j.limno.2025.126239","DOIUrl":"10.1016/j.limno.2025.126239","url":null,"abstract":"<div><div>The streams in the Amazon region play a pivotal role in maintaining biodiversity and providing ecosystem services, but they are vulnerable to a range of anthropogenic impacts. The objective of this study is to develop a biotic index based on macroinvertebrate communities for the purpose of assessing the ecological integrity of streams in the Tapirapé-Aquiri National Forest, an area that is threatened by mining and livestock activities. Sampling was conducted in 16 streams with varying degrees of impact over the course of two dry seasons in years of 2022 and 2023. Macroinvertebrates were collected from leaf litter habitats using a kick-net collector. Environmental conditions were evaluated through the adapted habitat integrity protocol and the calculation of integrated disturbance indices. The final index was composed of: genus richness, percentage of predators, and percentage of scrapers. No stream was classified as \"preserved\", with seven streams rated as \"acceptable\", eight as \"impacted\", and one as \"severely impacted\". The analysis indicated that activities such as mining and livestock farming are strongly associated with environmental degradation of high-altitude streams in the Amazon. Although the index showed moderate accuracy in cross-validation, it proved to be a promising tool for monitoring environmental quality in tropical regions. Future studies should consider integrating additional factors, such as habitat connectivity and hydrological dynamics, to enhance the index's sensitivity and support conservation policies.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"111 ","pages":"Article 126239"},"PeriodicalIF":2.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473933","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":"An approach towards the quantification of the dynamics of a lacustrine bay based on blue economy investments","authors":"Christopher Mulanda Aura ,&nbsp;Collins Onyango Ongore ,&nbsp;Safina Musa ,&nbsp;Francis Kimani Njonge ,&nbsp;Micheni Japhet Ntiba","doi":"10.1016/j.limno.2025.126235","DOIUrl":"10.1016/j.limno.2025.126235","url":null,"abstract":"<div><div>The article presents a possible translational approach for the quantification of the changes that may occur in a lakescape following increased blue economy investments. The methodology used available literature, data and information from blue economy strategies implemented in a very active shoreline and rapidly growing Kisumu Bay of Lake Victoria, Kenya, as well as other publicly available online information. The study aimed to investigate the possible dynamics that may have socio-ecological effects on the environment. Six in-situ data collection locations were chosen based on the monthly sampling which occurred between 2018 and 2023. All parameters and investigation sites demonstrated stochastic temporal and geographical shifts. However, using this novel conceptual framework, the data revealed a mixed picture of the effects of blue economy investments on lacustrine health following the revamping of most shoreline activities. Based on nutrient and light transparency data, the lake water was found to be eutrophic to hypereutrophic, which was exacerbated by the start of these initiatives. The socio-ecological assessment showed that the bay had experienced continued variety of blue economy investments ranging in size and proximity to the lake. The parameters used showed varied patterns based on the proposed geographical scaling paradigm. Most of the identified blue economy investments had large variations in magnitude and their closeness to lacustrine ecosystems. This study provides a more practical, focused and localised technique of analysing the socio-ecological and limnological status of a potential hot spot for blue economy investment that is applicable to other lacustrine environments.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"111 ","pages":"Article 126235"},"PeriodicalIF":2.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473932","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":"Environmental preservation leads to greater beta diversity of periphytic algae in Amazonian streams","authors":"Ellen Guimarães Amaral Trindade ,&nbsp;Bárbara Dunck","doi":"10.1016/j.limno.2024.126221","DOIUrl":"10.1016/j.limno.2024.126221","url":null,"abstract":"<div><div>Changes in land use modify the structure of forests and the dynamics of streams. They cause changes in the chemical and physical environments, directly affecting the composition of the local aquatic biota. Our research sought to answer whether species composition is different between streams with different land uses; whether density is higher in locations with lower environmental integrity values; whether the richness and diversity of periphytic species are related to higher values of environmental integrity indices; and whether beta diversity is greater in streams in preserved areas. 18 streams were sampled in the Tapajós River basin, in a range of at least 100 km in the stretch that comprises the banks of the Amazon National Park and its surroundings, located in the southwest region of the State of Pará. Samples of periphytic algae were obtained from the <em>Nymphaea amazonum</em> Mart. &amp; Zucc macrophyte. Our study demonstrated that streams located in preserved areas (national forest) differed environmentally from streams with agricultural land use and presented higher environmental integrity values. Species composition differed between different land uses. Environmental integrity had no effect on species diversity, richness and density. Beta diversity responded to different land uses, and the highest values were observed in streams from more intact environments. Our results showed that environmental variables had a greater influence on the structuring of the periphytic community than landscape variables. Preserved areas were important in environmental heterogeneity and in the formation of the structure of periphytic communities. Our study demonstrated that streams located in preserved areas differ from surrounding streams with different land uses, mainly because they present greater environmental integrity and greater variation in the beta diversity of periphytic algae.</div></div>","PeriodicalId":51110,"journal":{"name":"Limnologica","volume":"110 ","pages":"Article 126221"},"PeriodicalIF":2.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143129956","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":"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}