Water Biology and Security最新文献

{"title":"Effects of dietary Bacillus pumilus on the growth, intestinal health, lipid metabolism, and mTOR signaling pathway of juvenile coho salmon (Oncorhynchus kisutch)","authors":"Mengjie Guo ,&nbsp;Liuqing Meng ,&nbsp;Fanghui Li ,&nbsp;Yongqiang Liu ,&nbsp;Ziqi Zhang ,&nbsp;Qin Zhang ,&nbsp;Weiguang Kong","doi":"10.1016/j.watbs.2024.100313","DOIUrl":"10.1016/j.watbs.2024.100313","url":null,"abstract":"<div><div>This study investigated the effects of dietary supplementation with the probiotic <em>Bacillus pumilus</em> on coho salmon (<em>Oncorhynchus kisutch</em>). A total of 360 juvenile fish, with an average initial weight of 130.75 ​± ​1.33 ​g, were randomly assigned to four treatment groups, each with three replicates of 30 fish. The fish were then fed for 70 days using formulated diets containing four concentrations of <em>B. pumilus</em>: 0 (control group), 2 ​× ​10⁶, 4 ​× ​10⁸, and 8 ​× ​10¹⁰ ​CFU/g. We then evaluated growth, nutrient metabolism, immune-related serum biochemical markers, enzyme activity, gene expression, and muscle composition. Additionally, we assessed intestinal histology and microbiota composition. Our findings revealed that <em>B. pumilus</em> significantly improved growth, protein and fat metabolism, and immune function compared to the control group. It also had a positive effect on the structure and function of the intestinal microbiota. The group receiving 4 ​× ​10⁸ ​CFU/g showed the greatest improvements. Overall, <em>B. pumilus</em> appears to be a promising probiotic for enhancing the health and performance of coho salmon in aquaculture.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"4 1","pages":"Article 100313"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Eggshell waste as a promising adsorbent for phosphorus recovery from wastewater: A review","authors":"Protima Sarker ,&nbsp;Xin Liu ,&nbsp;Md Shiblur Rahaman ,&nbsp;Masahiro Maruo","doi":"10.1016/j.watbs.2024.100319","DOIUrl":"10.1016/j.watbs.2024.100319","url":null,"abstract":"<div><div>Phosphorus is a plant nutrient that is the main driving force of eutrophication, a serious type of water pollution. Various techniques and materials have been used to identify cost-effective, environmentally friendly options for phosphate removal. Eggshell waste is a good natural source of calcium, which is an effective adsorbent for phosphate removal. Many studies have examined pure eggshell, eggshell chemically modified with metal salts, and calcined eggshell mixed with biochar for phosphate removal. Here, most research on eggshell-based phosphate removal is reviewed to clarify the effectiveness of different types of modifications. Adsorption isotherm and kinetics models are the best methods for identifying the mechanism of adsorption, and both pure and modified eggshell have been characterized to understand the morphological and structural changes after adsorption. Furthermore, the phosphate-loaded material could be used as a fertilizer if it is not modified with harmful or toxic material. Eggshell-based adsorbents may provide cheaper, ecofriendly adsorbents for phosphate removal.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"4 1","pages":"Article 100319"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Taxonomic and functional diversity of protists in saline and hypersaline lakes in southern Western Siberia, a region strongly affected by climate change","authors":"Elena A. Gerasimova ,&nbsp;Alexander S. Balkin ,&nbsp;Vladimir Y. Kataev ,&nbsp;Ekaterina S. Filonchikova ,&nbsp;Yulia V. Mindolina ,&nbsp;Denis V. Tikhonenkov","doi":"10.1016/j.watbs.2024.100316","DOIUrl":"10.1016/j.watbs.2024.100316","url":null,"abstract":"<div><div>Climate change has had an unprecedented impact on lake ecosystems around the globe and has both direct and indirect consequences on lake structure and mineralization. These changes are threatening the unique biodiversity that lake ecosystems currently support. Siberia is experiencing one of the greatest impacts of climate change in the world, with exceptional warming in the north and increasing aridity in the south. Lakes in southern West Siberia, including saline and hypersaline waterbodies within endorheic basins, remain unexplored in terms of the biodiversity of the microbial eukaryotes inhabiting them. In this study, we investigated the taxonomic and functional diversity of planktonic protist communities in saline and hypersaline lakes (22–220‰) in southern Western Siberia through Illumina 18S rDNA amplicon sequencing. Taxonomic diversity was represented by the Amoebozoa, Archaeplastida, Cryptista, Excavata, Haptista, Obazoa, Provora, and TSAR supergroups, and varied significantly among lakes of different salinities. Salinity has been shown to be an important determinant that directly influences the composition and uniqueness of protist communities. The co-occurrence network analysis revealed a decrease in the complexity of the network of protist communities with increasing salinity. The taxonomic diversity of protists in lakes determines functional diversity, which is expressed as the relative abundance of free-living heterotrophs, phototrophs, and parasites. Phototrophs dominated the delta-hypersaline waters, and free-living heterotrophs dominated the alpha- and beta-hypersaline lakes. The parasite amplicon sequence variants (ASVs) were affiliated mainly with mixohaline and beta-hypersaline lakes.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"4 1","pages":"Article 100316"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143103957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of sub-monthly and sub-daily water level variations on water level fluctuation requirements of Phragmites australis and Phalaris arundinacea","authors":"Tingyu Zhang ,&nbsp;Wenjuan Gao ,&nbsp;Saibo Yuan ,&nbsp;Xiaodie Jiang ,&nbsp;Yongjing Zhao ,&nbsp;Yongde Cui ,&nbsp;Hongzhu Wang","doi":"10.1016/j.watbs.2024.100317","DOIUrl":"10.1016/j.watbs.2024.100317","url":null,"abstract":"<div><div>Water level variations (WLVs) substantially affect the spatial distribution of riparian vegetation. Accurately quantifying the water level fluctuation requirements (WLFRs) of aquatic macrophytes is essential for effective ecological water level management. Nevertheless, studies on the WLFRs of herbaceous plants in large river floodplains, such as <em>Phragmites australis</em> (common reed) and <em>Phalaris arundinacea</em> (reed canarygrass), are limited. Herein, we investigated the WLFRs of the two plants across water bodies with different WLVs in the Yangtze River Basin. We focused on the effects of sub-monthly and sub-daily WLVs on their average monthly water depth requirements (WDRs) during critical growth periods. Our findings indicated: (1) For <em>Phragmites</em>, during the emergence period, the upper limits of WDRs decreased with increased amplitudes of sub-monthly WLVs and with greater frequency and amplitude of sub-daily WLVs, in which sub-daily variations had a more pronounced effect. Conversely, during the rapid growth period, the upper limits increased with larger sub-monthly WLVs amplitudes, but decreased with higher frequency and amplitude of sub-daily WLVs. (2) For <em>Phalaris</em>, during both the emergence and rapid growth periods, intensified sub-daily WLVs led to decreased upper limits of WDRs. In summary, although distinct disparities existed in the WLFRs of <em>Phragmites</em> and <em>Phalaris</em> across various water bodies, the trends in WDRs during the emergence and rapid growth periods were consistent for both species. These findings provide essential quantitative data to restore aquatic vegetation and carry out effective ecological water level management in large-scale riparian ecosystems.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"4 1","pages":"Article 100317"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143170948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CRISPR/Cas9 mutagenesis reveals an essential role of PI4KB in promoting growth and resisting hemorrhagic disease caused by GCRV-II infection in juvenile grass carp","authors":"Jie Zhang ,&nbsp;Liqiang Zhang ,&nbsp;Xiaoman Wu ,&nbsp;Minhui Tao ,&nbsp;Yang Chen ,&nbsp;Mingxian Chang","doi":"10.1016/j.watbs.2024.100323","DOIUrl":"10.1016/j.watbs.2024.100323","url":null,"abstract":"<div><div>Few studies have reported obtaining grass carp resistant to hemorrhagic disease via gene editing in commercial fish. Here, we demonstrate that the expression and activity of grass carp PI4KB (gcPI4KB) are vital for GCRV-I and GCRV-II replication. Given the obvious cytopathic effect (CPE) in the present available cell lines is only caused by GCRV-I, but GCRV-II is the current popular and fatal strain in grass carp, GCRV-I and GCRV-II are used in cell lines and in grass carp, respectively. <em>In vitro</em> studies in CIK cells revealed that gcPI4KB interacted with NS80 and VP3 of GCRV-I, and that gcPI4KB was recruited by NS80 for promoting the generation of GCRV viral inclusion bodies (VIBs). Since the negative regulatory role of gcPI4KB in GCRV infection was confirmed by <em>in vitro</em> data, we performed gene editing of gcPI4KB in grass carp. We found that PI4KB F0 juvenile grass carp crispants have obvious advantages in promoting growth and in resisting GCRV-II infection. Compared with uninfected WT grass carp, the uninfected PI4KB F0 juvenile grass carp crispants exhibit a higher expression level of many genes involved in growth- and development-related metabolic pathways such as the FoxO signaling pathway and insulin signaling pathway. Compared with WT grass carp without infection, PI4KB F0 juvenile grass carp crispants without infection or WT grass carp infected with GCRV-II, higher expression levels for many genes involved in metabolic diseases and viral infections were observed in the liver from PI4KB F0 juvenile grass carp crispants infected with GCRV-II. Altogether, the present study suggests the mechanism of gcPI4KB in facilitating GCRV replication, the signaling pathways regulated by gcPI4KB, and the possibility to obtain grass carp resistant to hemorrhagic disease via gene editing of PI4KB.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"4 1","pages":"Article 100323"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The lake cod Gadus morhua kildinensis in the context of conservation biology","authors":"Igor Popov","doi":"10.1016/j.watbs.2024.100325","DOIUrl":"10.1016/j.watbs.2024.100325","url":null,"abstract":"<div><div>Atlantic cod, <em>Gadus morhua</em>, is a marine fish, but there are several Arctic lakes, where it also occurs. Mogilnoye Lake on Kildin Island in the Barents Sea is especially famous for them. It is a salinity stratified meromictic lake. The surface layer is fresh with saline water saturated with hydrogen sulfide underneath. Kildin cod have been studied over the last 100 years with emphasis on taxonomy, physiology, genetics and growth. However, the conservation of this species has been overlooked. Recent sonar surveys showed that the cod are quite abundant, but in danger from hydrogen sulfide accumulation within the lower lake levels. Therefore, the habitat of this species is shrinking. Conservation studies must be a priority in the situations like this.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"4 1","pages":"Article 100325"},"PeriodicalIF":5.1,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143171578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"From source to lake: Multi‒taxon alpha and beta diversity patterns along a river above 4500 ​m AMSL on the Qinghai‒Tibetan Plateau","authors":"Yintao Jia ,&nbsp;Huan Zhu ,&nbsp;Tingfeng Xie ,&nbsp;Xiong Xiong ,&nbsp;Zhengfei Li ,&nbsp;Yongde Cui ,&nbsp;Guoxiang Liu ,&nbsp;Mingdian Liu ,&nbsp;Yifeng Chen","doi":"10.1016/j.watbs.2024.100294","DOIUrl":"10.1016/j.watbs.2024.100294","url":null,"abstract":"<div><div>Understanding the distribution of species is highly important for optimizing future conservation priorities and strategies at the regional scale. Relatively little attention has been given to multi-taxon aquatic biota in extreme alpine environments. We examined the spatial and temporal patterns of alpha and beta diversity, site-specific contributions to beta diversity and assembly mechanisms of four taxonomic groups (fishes, macroinvertebrates, zooplankton and phytoplankton) from the source to the estuary of the Za'gya Zangbo River above 4500 ​m AMSL (above mean sea level) on the northern Qinghai-Tibetan (Q–T) Plateau. A total of 4 fish species, 45 macroinvertebrate taxa, 17 zooplankton taxa and 56 phytoplankton taxa were found in the study area. No consistent patterns in taxonomic richness were observed across taxa from upstream to estuary. The fish communities had the lowest dissimilarity between communities, the phytoplankton community had the highest dissimilarity in the dry season, and the macroinvertebrate community had the highest dissimilarity in the wet season. The relative importance of the turnover and nestedness components varied considerably across taxa and along spatial gradients. The diversity patterns of macroinvertebrate, zooplankton and phytoplankton communities were significantly correlated with several environmental factors, whereas only the beta diversity of fish was correlated with altitude. Stochastic processes dominated in shaping the macroinvertebrate communities whereas deterministic processes dominated the assembly of the phytoplankton communities. Weak congruence of diversity patterns across taxonomic groups suggested that biological groups cannot serve as reliable surrogates for one another and that multiple biological groups should be included in the biomonitoring of high-altitude rivers on the Q‒T Plateau. The relatively unique species in the upstream area and estuary of the Za'gya Zangbo River harbor should receive more attention in future conservation and management schemes.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"3 4","pages":"Article 100294"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gossypol is the main limiting factor in the application of cottonseed meal in grass carp feed production: Involvement of growth, intestinal physical and immune barrier, and intestinal microbiota","authors":"Yong Shi ,&nbsp;Lei Zhong ,&nbsp;Yuanxiang Liu ,&nbsp;Shuang Zheng ,&nbsp;Shude Xu ,&nbsp;Shouqi Xie ,&nbsp;Yi Hu","doi":"10.1016/j.watbs.2024.100287","DOIUrl":"10.1016/j.watbs.2024.100287","url":null,"abstract":"<div><div>The objective of this study is to investigate the effects of free gossypol in cottonseed meal (CM) on the growth and intestinal health of grass carp, as well as to determine whether free gossypol is the primary factor restricting high-level inclusion of cottonseed meal. This study was designed with five groups: the control group (32% soybean concentrate protein), the CM group (44% CM), the cottonseed protein concentrate (CPC) group (33% CPC), and the CPC and control groups with 400 and 600 ​mg/kg gossypol added, designated as CON, CM, CPC, CPC ​+ ​GP, and CON ​+ ​GP, respectively. The experiment lasted eight weeks, and each group had three replicates. This experiment employed one-way ANOVA and Duncan's multiple comparisons of the means. The findings revealed that in comparison to the CON group, the growth of fish in the CM, CPC ​+ ​GP, and CON ​+ ​GP groups significantly decreased. Intestinal inflammation damage was observed. This was indicated by a significant upregulation of pro-inflammatory factors, including <em>tnf-α</em>, <em>nf-κb</em>, <em>il-6</em>, <em>il-8</em>, <em>il-12β</em>, and <em>il-1β</em>, along with significant downregulation of anti-inflammatory factors, including <em>tgf-β1</em>, <em>il-15</em>, and <em>il-10</em>. Additionally, significant downregulation of antioxidant enzyme-related genes, including <em>nrf2</em>, <em>cat</em>, <em>CuZnsod</em>, <em>gpx4</em>, and <em>gpx1</em>, was observed and the intestinal physical barrier function was compromised. In addition, the intestinal microbiota composition was affected, with a significant reduction in <em>Bacillus</em> and <em>Cetobacterium</em> abundances and a remarkable increase in the abundance of <em>Aeromonas</em>, resulting in dysregulation of the intestinal microbiota function. However, in comparison to the CM group, the growth rate of fish in the CPC group exhibited a marked increase; nonetheless, it persisted at a level lower than that observed in the CON group and the degree of intestinal damage was significantly improved. Additionally, the intestinal microbiota structure was found to be similar to that of the CON group. In conclusion, excessive CM negatively affects grass carp growth and intestinal health, whereas replacing CM with CPC mitigates these effects. Adding gossypol equivalent to CM group in CON and CPC diets reduces growth performance and impairs intestinal function, indicating gossypol as a primary limiting factor for high CM inclusion in diets.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"3 4","pages":"Article 100287"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141713596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implications of digital elevation models on habitat analysis of Golden Mahseer in the Upper Ganga Basin, India","authors":"J.P. Nale,&nbsp;G.K. Pakhale","doi":"10.1016/j.watbs.2024.100278","DOIUrl":"10.1016/j.watbs.2024.100278","url":null,"abstract":"<div><div>Aquatic habitat analysis is crucial in determining the relationship between river flow and habitat availability for aquatic species. This helps in identifying the environmental flow requirements of rivers. However, conducting habitat analysis in Indian rivers is challenging because of the unavailability of reliable and high-resolution terrain data. To address this challenge, a study was conducted to explore the possibilities of using Digital Elevation Models (DEMs) to extract required hydraulic data and to evaluate their accuracies. The extracted data were coupled with ecological data of a keystone fish species, namely Golden Mahseer (<em>Tor putitora</em>), to develop habitat analysis models for the Upper Ganga Basin (UGB) in India. The study adopted a hierarchical three-step approach for evaluating the accuracy and performance of DEMs as surrogate data sources. Firstly, cross sections at selected sites in the UGB were extracted from three different DEMs (SRTM, ASTER, and CARTOSAT) and evaluated against surveyed cross-section data with turning point tests and correlation coefficients. These data were then used to establish hydraulic and habitat analysis models. Four parameters (top width, flow cross-sectional area, hydraulic mean depth, and wetted perimeter) were evaluated using five error estimators to determine the accuracy and performance of hydraulic modelling. Finally, the hydraulic parameters were coupled with ecological requirements to develop a habitat model for different life stages of Golden Mahseer, namely fingerling, juvenile, and adult stages.</div><div>We found that the SRTM predictions were better than those of the other DEMs, indicating its suitability to replicate channel geometry with higher accuracy, thus better predicting hydraulic parameters at all flow ranges. In habitat area estimation for adult Golden Mahseer, all the DEMs performed reasonably well (within ±20%) within the flow range of 100 ​m³/s, which covers the low to average flow season. Beyond this flow range, ASTER and CARTOSAT resulted in considerable underestimations, averaging 22% and 54%, respectively. It is important to note that DEM-based cross sections lack high-resolution channel information, resulting in unstable habitat predictions for younger life stages like fingerling. However, overall, the study established that DEM-based data can be relied upon for habitat modelling-based assessment of environmental flows with some precautions for sensitive cases. Remote sensing presents a promising avenue for habitat analysis studies of Indian species, offering the potential to unlock significant progress in environmental flows (E-Flows) assessments and thus providing ecological benefits.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"3 4","pages":"Article 100278"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Relationships between environmental variables and fish functional groups in impounded reaches of the Upper Mississippi and Yangtze Rivers","authors":"Kyle J. Brumm ,&nbsp;Fangyuan Xiong ,&nbsp;Yushun Chen ,&nbsp;Hao Yu ,&nbsp;Lizhu Wang ,&nbsp;Dana M. Infante","doi":"10.1016/j.watbs.2024.100291","DOIUrl":"10.1016/j.watbs.2024.100291","url":null,"abstract":"<div><div>Large rivers throughout the world have been transformed by anthropogenic stressors that are known to influence the structure and composition of fish assemblages. Management of large rivers requires balancing socio-economic and political considerations with biodiversity conservation efforts. By exchanging best management practices between rivers, management efforts can be improved. However, data limitations have largely prevented comparative analyses among fish assemblages in large rivers, potentially limiting the effectiveness of shared management strategies. To improve understanding of the similarities and differences between the Upper Mississippi and Yangtze Rivers, we (1) compared environmental variables and functional traits of fish assemblages between the two systems, (2) identified traits responsible for distinguishing functional groups from one another, and (3) investigated relationships between similar functional groups of fishes and environmental variables to establish expectations for how fish assemblages in large rivers might respond to anthropogenic stressors. Regional species pools in the Upper Mississippi and Upper Yangtze Rivers were characterized by a similar composition of functional traits; the majority of species were omnivorous, had affinities for gravel or sand substrates, and produced sinking eggs. Few species were pelagic, planktivorous, or herbivorous. Functional groups in both rivers were primarily distinguished according to species' trophic habits and substrate preferences, with secondary contributions from species’ water column positions and life history characteristics. Pelagic planktivores and small-bodied guarders with an affinity for structural habitat complexity tended to increase downriver in both systems, in direct association with total phosphorus concentrations, agricultural land use, and temperature. In contrast, proportions of lithophilic species with affinities for gravel or cobble substrates were highest in segments located furthest upriver. By highlighting the sensitivity of different groups of fishes to anthropogenic stressors, we provide insights into the functional ecology of fishes inhabiting the Mississippi and Yangtze Rivers.</div></div>","PeriodicalId":101277,"journal":{"name":"Water Biology and Security","volume":"3 4","pages":"Article 100291"},"PeriodicalIF":5.1,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}