Aquatic Ecology最新文献

{"title":"Effect of ultraviolet radiation (type B) and titanium dioxide nanoparticles on Microcystis aeruginosa and Lemna minor growth rate and potential allelopathic interactions","authors":"Sadiya Awala Samuel,&nbsp;Suleiman Dauda,&nbsp;Regina Anya Otogo,&nbsp;Adriana Sturion Lorenzi,&nbsp;Zainab Abdullahi Ibrahim,&nbsp;Elizabeth Abdulmalik,&nbsp;Micheline Kezia Cordeiro-Araujo,&nbsp;Mathias Ahii Chia","doi":"10.1007/s10452-026-10347-6","DOIUrl":"10.1007/s10452-026-10347-6","url":null,"abstract":"<div><p>Ultraviolet-B (UV-B) radiation, intensified by ozone depletion, is a major stressor for aquatic primary producers. Titanium dioxide nanoparticles (TiO₂ NPs) are widely used in industrial and consumer products, leading to their increasing discharge into aquatic systems. These particles interact with cyanobacteria (e.g., <i>Microcystis aeruginosa</i>) and macrophytes (e.g. <i>Lemna minor</i>). This study examined the interactive effects of UV-B radiation (0.8 W/m² and 2 W/m²) and TiO₂ NPs (48 mg/L) on the physiological responses and allelopathic interactions between <i>M. aeruginosa</i> and <i>L. minor</i>. Our findings showed that low UV-B exposure significantly reduced chlorophyll <i>a</i> and total protein levels in <i>M. aeruginosa</i>, accompanied by increased microcystin, hydrogen peroxide (H₂O₂), and malondialdehyde (MDA) levels under UV-B exposure. High UV-B particularly upregulated peroxidase (POD) activity in <i>M. aeruginosa</i>. In <i>L. minor</i>, low UV-B enhanced chlorophyll <i>a</i>, whereas high and low UV-B and TiO₂ exposure suppressed pigment and growth. Co-culturing <i>M. aeruginosa</i> with <i>L. minor</i> under low UV-B and TiO₂ exposure further suppressed algal growth and reduced protein content. UV-B and TiO₂ increased oxidative damage, reduced algal biomass and toxin production, and potentially disrupted allelopathic interactions. Exposure of <i>L. minor</i> to <i>M. aeruginosa</i> and high UV-B increased H₂O₂ levels and POD activity. Our results show that allelopathic interactions between <i>L. minor</i> and <i>M. aeruginosa</i> are highly sensitive to UV-B radiation and are further increased when TiO₂ nanoparticles are present. Additionally, UV-B radiation and TiO₂ nanoparticles exert synergistic physiological stress on <i>M. aeruginosa</i> and <i>L. minor</i>, potentially changing species interactions and reshaping community structure in freshwater ecosystems.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838254","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 variation of the fish community in a mine tailings dam","authors":"Caio De Marco Oliveira do Nascimento,&nbsp;Rafael de Oliveira Marques,&nbsp;Reinaldo Luiz Bozelli,&nbsp;Erica Pellegrini Caramaschi,&nbsp;Bruno Eleres Soares","doi":"10.1007/s10452-026-10349-4","DOIUrl":"10.1007/s10452-026-10349-4","url":null,"abstract":"<div><p>It is expected that the spatial distribution of ichthyofauna in reservoirs within mining areas will be affected by environmental changes imposed by damming and the progressive deposition of tailings. In this context, we evaluated variations in the taxonomic and functional diversity of fish communities at five locations within the Gelado tailings dam, formed by a dammed stream in the Brazilian Amazon region. Among these locations, two are additionally affected by the continuous deposition of iron tailings. We sampled fish (collected using standardized gill nets) and environmental data in 2006, 2007, 2008, 2009, and 2021. We used linear mixed-effects models (GLMM) and permutational analysis of variance to assess differences in alpha and beta diversity among the different locations, respectively. We used the longitudinal gradient and expedition years to control for potential spatial and temporal autocorrelation effects during the analyses. Our results revealed that species composition varied significantly only between areas with and without tailings, while taxonomic structure, functional structure, and functional composition showed no variations among the different locations. The longitudinal gradient was significant only for functional evenness. Differences in species composition were due to variations in the abundance and capture frequency of <i>Leporinus friderici,</i> primarily in the area with tailing. Consequently, effects related to tailings deposition, along with the longitudinal gradient, exert a greater influence on the spatial structure of communities than local environmental variations, such as the presence of specific microhabitats. In conclusion, the fish community exhibited low species richness when compared to the regional species pool, an expected effect of the 45-year-old damming, and displayed an altered spatial structure in areas with continued deposition of iron tailings.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10349-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sessile invertebrate assemblages on artificial structures at a commercial kelp farm and on natural substrates at an adjacent kelp forest site, Lüderitz, Namibia: baseline patterns of spatial and temporal variation","authors":"Dortea Hamukoto,&nbsp;Lineekela Kandjengo,&nbsp;Tamuka Nhiwatiwa","doi":"10.1007/s10452-026-10337-8","DOIUrl":"10.1007/s10452-026-10337-8","url":null,"abstract":"<div><p>Kelp aquaculture is expanding globally, yet baseline information on sessile invertebrates associated with farm infrastructure remains limited in southern Africa. We characterised assemblages on artificial structures at a commercial <i>Macrocystis pyrifera</i> farm in Shearwater Bay and on natural substrates within an adjacent kelp forest at Diaz Point, Lüderitz, Namibia. Three sampling campaigns were conducted during 2024. Individual-count and percentage-cover data were used for within-site substrate analyses, while presence-absence data were used for an exploratory description of broader assemblage patterns. Thirty taxa from eight phyla were recorded: 24 at Diaz Point and 19 at Shearwater Bay, with 13 taxa shared. Because the sites differed in sampling effort, substrate composition, kelp species, seabed type and hydrodynamic exposure, these observed totals and between-site patterns are descriptive rather than estimates of habitat effects. Within each site, assemblage structure varied among substrates and sampling campaigns, although abundance-based PERMANOVA results were partly associated with heterogeneous multivariate dispersion. Occurrence-based ordination showed partial separation with overlap; Shearwater Bay samples were more tightly clustered, whereas Diaz Point samples occupied a broader ordination space. Farm structures were frequently occupied by mussels and barnacles, while the natural-site taxon list included a wider range of sponges, anemones, bryozoans and polychaetes. The study establishes a baseline for monitoring fouling assemblages, non-native kelp cultivation and farm operations in the Lüderitz coastal system.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838130","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":"Factors driving micro-habitat structuring of zoomacrobenthic assemblages in a north-western Iberian estuary","authors":"Nuno Gomes,&nbsp;Isabel Sousa-Pinto,&nbsp;Carlos Antunes","doi":"10.1007/s10452-026-10348-5","DOIUrl":"10.1007/s10452-026-10348-5","url":null,"abstract":"<div><p>Estuaries are open systems with highly structured habitats and rich biodiversity. The structuring of invertebrate assemblages depends on several factors, such as saline and depth gradients, vegetation coverage and substrate characteristics. Transition areas are an interconnected mosaic of habitats that are subject to daily and seasonal environmental changes. Identifying the factors that drive community structuring at large and small scale is crucial for habitat preservation. This study analysed the relationship between different contiguous assemblages in the Minho River estuary, focusing on the salinity gradient present in the intertidal and subtidal zones with soft substrates, and in algal and macrophyte beds, as well as their associated sediments. The distribution of most species was determined by salinity and depth gradients, sediment texture and organic matter content. The seasonal colonisation of areas upstream or downstream depended on salinity and temperature. Overall, the diversity and abundance of sediments associated with macrophytes is higher, which highlights the importance of these beds in estuarine productivity. Furthermore, the assemblages found in the <i>Fucus ceranoides</i> and <i>Egeria densa</i> leaves differed markedly from those found on the soft bottom. It was also discovered that, in oligohaline environments, regional drivers shape the invertebrate communities, in contrast to polyhaline and tidal freshwater environments which are mainly shaped by both regional and local factors. In the light of these findings it becomes evident that submerged vegetation plays a vital role in the maintenance of estuarine biodiversity and its areas should be designated as zones of special interest for ecological processes.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837454","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":"Infection dynamics and temporal structure of gill monogeneans (Platyhelminthes: Dactylogyridae) of Enteromius guirali Thominot, 1886 in Cesala River, Cameroon","authors":"Tombi Jeannette,&nbsp; Onana Ngono Michel Thierry,&nbsp;Ndongo Ivan","doi":"10.1007/s10452-026-10342-x","DOIUrl":"10.1007/s10452-026-10342-x","url":null,"abstract":"<div><p>Monogeneans are fish ectoparasites which commonly infest gill filament. Population dynamics and temporal structure of gill monogeneans were studied on 390 individuals of <i>Enteromius guirali</i> caught in the Cesala River. From June 2020 to June 2021, 3671 <i>Dactylogyrus mendehei</i> and 4684 <i>Dactylogyrus nyongensis</i> were collected. Prevalence were low in June 2021 and high in August 2020 for <i>D. mendehei</i>; low in December and high in June 2020 for <i>D. nyongensis</i>. Mean intensities were lowest in June, October, November and December 2020; January and February 2021 for <i>D. mendehei</i>; November and December 2020 for <i>D. nyongensis</i>. <i>Dactylogyrus mendehei</i> parasitized the same number of hosts each season, whereas <i>D. nyongensis</i> parasitized few hosts during the long dry season. <i>Dactylogyrus mendehei</i> and <i>D. nyongensis</i> were more abundant on the gills of <i>E. guirali</i> during the long and short rainy seasons. <i>Dactylogyrus mendehei</i> was frequently distributed according to models III, II, I, IV (September 2020 and February 2021) and II, IV, III, I (December 2020 and January 2021) while <i>D. nyongensis</i> frequently occupied the gill arches according to model II, III, IV, I (September, November, December 2020 and February 2021). The patterns of exploitation of the transverse gradient by monogeneans changed over time. It was linked to the variation model of the colonisable gill surface area of this Teleost. An increase of temperature and a decrease of water level influenced the distribution of component community. The robustness of the haptoral parts have a positive effect on parasitism by <i>D. mendehei</i> and <i>D. nyongensis</i>.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148837704","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":"Adaptability of Chaetomorpha valida (Ulvophyceae) spores to salinity, nutrients and water flow in aquaculture ponds and its invasive evaluation","authors":"Dongyue Li,&nbsp;Ronglian Xing,&nbsp;Rui Li,&nbsp;Xuebin Cao,&nbsp;Shujun Hu,&nbsp;Xiaojing Pan,&nbsp;Hongxia Zhang,&nbsp;Lihong Chen,&nbsp;Zhen Yu","doi":"10.1007/s10452-026-10344-9","DOIUrl":"10.1007/s10452-026-10344-9","url":null,"abstract":"<div><p>The alien species <i>Chaetomorpha valida</i>, first found in sea cucumber ponds in Liaoning and Shandong, has severely harmed China’s ecology, economy, and society. The periodic abundance of this alga greatly affects water quality and sometimes leads to the loss of aquaculture. Spore reproduction may be one of the main reasons for its rapid growth. Adaptability to the environment also determines its rapid adaptation and expansion of territory. However, the invasion potential remains poorly understood. We investigated reproductive characteristics in different lengths of fragments excised from <i>C. valida</i>, the detailed process and environmental adaptation conditions of spore reproduction and the variation of the enzyme activity of cells during sporangium formation. Results: shorter fragments boosted spore reproduction (more sporangia, spore release) but reduced vegetative reproduction; algal cell oxidation favored sporangium formation. Salinity 20–30 psu best promoted sporangium formation/release (salinity 40 psu inhibited both); high nitrogen enhanced sporangium production. Low water flow promoted spore release, high flow inhibited it and reduced spore attachment. Suitable fragment lengths and environments enabled massive spore production and new individual development, so spore-producing fragments drive <i>C. valida</i>’s biomass accumulation. Analyzing spore reproduction/germination helped predict its spread, aiding biological invasion control.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148783029","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 distribution and hydrological influences of microplastic contamination in the upstream reach of the ambathale water treatment plant intake, Sri Lanka","authors":"Dilshan Rathnayake,&nbsp;Nandika Miguntanna,&nbsp;Upaka Rathnayake","doi":"10.1007/s10452-026-10341-y","DOIUrl":"10.1007/s10452-026-10341-y","url":null,"abstract":"<div><p>Microplastic contamination has emerged as a global environmental concern, with rivers serving as important pathways for the accumulation and transport of these particles. This study investigated the spatial distribution of microplastic contamination and the influence of hydrological and physicochemical factors on microplastic occurrence in the upstream reach of the Ambathale Water Treatment Plant intake along the Kelani River, Sri Lanka. Water samples were collected from four locations within the study area, including three upstream sites and one downstream site. Microplastics were detected at all sampling locations, with Kelaniya recorded the highest microplastic concentration (20.08 ± 10.19 mg/L), while Ambathale had the lowest (9.12 ± 3.89 mg/L). Three main microplastic types were identified: fibers, fragments, and films. Fibers and fragments were the most abundant microplastic types across all sampling locations, while films occurred at comparatively lower concentrations. Statistical analyses revealed a significant positive correlation between river water level and microplastic concentration (r = 0.883, <i>p</i> = 0.001), indicating the importance of hydrological conditions in microplastic transport. Fiber and film concentrations exhibited particularly strong positive relationships with water-level fluctuations (r = 0.940 and r = 0.904, respectively; <i>p</i> &lt; 0.01). Furthermore, positive associations between microplastic abundance and suspended solids suggest that particulate matter plays an important role in the transport and distribution of microplastics within the river system. The findings demonstrate significant spatial variability in microplastic contamination and highlight the influence of hydrological processes on microplastic occurrence and transport in the Kelani River. This study provides baseline information for future monitoring and contributes to a better understanding of microplastic dynamics in tropical freshwater environments.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782179","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":"Exploring environmental and biogeographic patterns of Ceriantharia (Cnidaria) across the Atlantic through habitat suitability modeling","authors":"Marcela Aparecida de Barros,&nbsp;Gustavo Reis de Brito,&nbsp;Sergio N. Stampar","doi":"10.1007/s10452-026-10343-w","DOIUrl":"10.1007/s10452-026-10343-w","url":null,"abstract":"<div><p>Tube-dwelling anemones of the subclass Ceriantharia are important components of benthic ecosystems, contributing to habitat complexity and supporting diverse biological interactions. Despite their ecological relevance, most species remain poorly studied due to sampling difficulties and the limited knowledge available regarding their ecology, biogeography, and dispersal. In this context, habitat suitability modeling provides a valuable framework for identifying environmentally suitable areas for understudied marine taxa. Here, we present the first broad-scale habitat suitability assessment for nine Atlantic Ceriantharia species using MaxEnt models. Model projections were interpreted as environmentally suitable areas sharing conditions with known occurrences rather than as estimates of realized or potential geographic distributions. All models showed satisfactory predictive performance (AUC ≥ 0.70; TSS ≥ 0.40). Bathymetry emerged as the dominant environmental predictor, followed by temperature and slope, indicating that broad-scale oceanographic gradients strongly influence habitat suitability. Three major centers of environmental suitability were consistently identified across the Atlantic basin, encompassing the western Atlantic, the eastern Atlantic, and high-latitude regions. Although several models recovered suitability patterns consistent with documented occurrences, others projected environmentally suitable areas beyond currently known records, highlighting the influence of limited knowledge regarding species dispersal, population connectivity, and historical biogeography. These results provide the first comprehensive overview of habitat suitability patterns for Atlantic Ceriantharia, identify priority regions for future sampling, and demonstrate the importance of integrating ecological, oceanographic, and life-history information to improve habitat suitability assessments for poorly known benthic marine invertebrates.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10343-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anurans as potential external vectors of putative anthropogenic microfibers in neotropical coastal wetlands","authors":"Diana Balieiro Pinheiro,&nbsp;Andressa Adolfo,&nbsp;Leonardo Maltchik,&nbsp;Cristina Stenert","doi":"10.1007/s10452-026-10340-z","DOIUrl":"10.1007/s10452-026-10340-z","url":null,"abstract":"<div><p>Anthropogenic microfibers are pervasive contaminants in aquatic ecosystems, yet their interactions with organisms are predominantly studied through ingestion. External adhesion represents a potentially important but overlooked pathway of anthropogenic microfiber transport. Here, we assessed the occurrence of putative anthropogenic microfibers adhering to the skin of adult anurans in coastal wetlands of southern Brazil, evaluating their potential role as external biological vectors. We sampled 165 individuals from nine species spanning aquatic, terrestrial, and arboreal ecological groups across four sites. Samples were processed using stereomicroscopy, and microfibers were identified based on morphological features and characterized by size and color. Differences in occurrence and load among ecological groups were evaluated using hurdle models. Microfibers were detected in 28.5% of individuals and occurred across seven species and all ecological groups. In total, 889 microfibers were recovered, with highly variable loads among individuals. Transparent microfibers overwhelmingly dominated samples (94.7%). The widespread presence of adhered microfibers among sampled individuals is consistent with microfiber exposure during the sampling period and with amphibian skin acting as a substrate for particle adhesion under the surveyed conditions. Although transport was not directly quantified, these findings highlight a previously underexplored pathway of organism–microfiber interaction, with potential implications for passive redistribution of contaminants across interconnected wetland ecosystems.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10340-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Benthic primary producers affect pelagic nitrogen fixation by influencing benthic nutrient fluxes in a shallow lake","authors":"K. Riley Book,&nbsp;Emily L. Adler,&nbsp;Jamieson C. Botsch,&nbsp;Ian S. Hart,&nbsp;Árni Einarsson,&nbsp;Anthony R. Ives","doi":"10.1007/s10452-026-10339-6","DOIUrl":"10.1007/s10452-026-10339-6","url":null,"abstract":"<div><p>Nutrient supply is an important determinant of N fixation rates in pelagic cyanobacteria. In shallow aquatic ecosystems, benthic primary producers can affect nutrient release from the sediment to the pelagic zone, yet the relationship between benthic primary producers and pelagic N fixation is not well understood. Here, we explore the effect of benthic primary producers on benthic nutrient fluxes and pelagic N fixation rates in shallow, eutrophic Lake Mývatn, Iceland. In paired benthic nutrient flux and pelagic N fixation assays, we showed that sites with increased benthic phosphate release were associated with increased pelagic N fixation. In turn, during assays of flux rates, benthic phosphate release was negatively associated with dissolved oxygen concentrations at the sediment–water interface, which was positively associated with benthic primary producer abundances. Together, these relationships suggest that benthic primary producers influence variation in within-lake pelagic N fixation via their effects on benthic nutrient flux rates.</p></div>","PeriodicalId":8262,"journal":{"name":"Aquatic Ecology","volume":"60 3","pages":""},"PeriodicalIF":2.2,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10452-026-10339-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}