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118 results for “Eutrophication”
A temporally consistent spatial gradient in methane ebullition from a eutrophic lake
<p>CH4 ebullition rates from lake Alstasjö (<a href="../api/records/11205773/draft/files/CH4Ebullition.xlsx/content" target="_blank" rel="noopener noreferrer">CH4Ebullition.xlsx</a>)</p> <p>CH4 ebullition rates from lake Alstasjö related to sediment temperature (<a href="../api/records/11205773/draft/files/CH4_Ebullition_Site_SedT.csv/content" target="_blank" rel="noopener noreferrer">CH4_Ebullition_Site_SedT.csv</a>)</p> <p>CH4 and gas ebullition rates and sedment characteristics (<a href="../api/records/11205773/draft/files/CH4_GS_update5.csv/content" target="_blank" rel="noopener noreferrer">CH4_GS_update5.csv</a>)</p> <p>Supplementary information <a href="../api/records/11205773/draft/files/SupportingInfo.pdf/content" target="_blank" rel="noopener noreferrer">SupportingInfo.pdf</a> </p> <p>Oxygen levels at lake Alstasjö between 2020-2021 (<a href="../api/records/11205773/draft/files/O2_Alsta_DailyMean.csv/content" target="_blank" rel="noopener noreferrer">O2_Alsta_DailyMean.csv</a>)</p> <p>Sediment dating from sediment cores collected at Alstasjö near bubble traps (<a href="../api/records/11205773/draft/files/CH4_SedimentDating.csv/content" target="_blank" rel="noopener noreferrer">CH4_SedimentDating.csv</a> and </p> <p><a href="../api/records/11205773/draft/files/CH4_SedimentDating_Cs.csv/content" target="_blank" rel="noopener noreferrer">CH4_SedimentDating_Cs.csv</a>)</p> <p>Results of lake Alstasjö thermal dynamics using lake analyzer (<a href="../api/records/11205773/draft/files/results_rLakeAnalyzer_Alsta.csv/content" target="_blank" rel="noopener noreferrer">results_rLakeAnalyzer_Alsta.csv</a>)</p> <p>Water level and discharge from Alstasjö (<a href="../api/records/11205773/draft/files/WaterLevelvsDischarge.xlsx/content" target="_blank" rel="noopener noreferrer">WaterLevelvsDischarge.xlsx</a>)</p>
Combined data file for Jokinen et al. "Depth and intensity of the sulfate-methane transition zone control sedimentary molybdenum and uranium sequestration in a eutrophic low-salinity setting", Applied Geochemistry 122, 2020
<p>The datafile contains all the new raw data presented in the figures in the publication.</p>
Ebullition drives high methane emissions from a eutrophic coastal basin
<p>Dataset used in the article: "Ebullition drives high methane emissions from a eutrophic coastal basin".</p>
The effect of eutrophication and global change on heterocystous cyanobacteria in freshwater lakes
<p>Eutrophication and global change have been suggested to promote cyanobacterial blooms. <em>Anabaena, Aphanizomenon and Cylindrospermopsis</em> are heterocystous genera of toxin-producing cyanobacteria. It is yet unclear how eutrophication and climate change will impact heterocystous cyanobacteria. This study investigates the effects of total nitrogen (TN), total phosphorus (TP), TN:TP ratio, temperature, pH and trophic state on the relative abundance of three heterocystous cyanobacteria, using data of 999 lakes obtained from the National Lake Assessment 2012 (NLA) of the U.S. Environmental Protection Agency (EPA). It was demonstrated that elevated TN and TP levels, as well as higher pH levels are related to higher abundance of heterocystous cyanobacteria. <em>Cylindrospermopsis</em> is correlated with TN and temperature, <em>Aphanizomenon</em> is related with TP and negatively correlated to TN:TP. All three heterocysts are correlated with pH. Eutrophication has a higher effect on the relative abundance of heterocystous cyanobacteria than the increased temperatures and increased CO<sub>2</sub> concentrations. Decreasing the concentration of nitrogen and especially phosphorus in lakes may limit the relative abundance of heterocystous cyanobacteria in fresh waters.</p>
Eutrophication Risk Index (ERI) for the Cerrado and Caatinga: Modeling Scenarios for 2030 and 2040
<p><span>To assist in mapping Water Pollution Risk (WPR), we developed the Eutrophication Risk Index (ERI). This index is designed to assess and predict the vulnerability of water bodies to eutrophication, a process driven by excessive nutrient accumulation—particularly nitrogen and phosphorus—resulting in uncontrolled algal growth. The ERI helps identify at-risk areas and supports the development of more effective mitigation strategies aimed at preserving water quality and sustaining aquatic ecosystems.</span></p> <p><span>The proposed Eutrophication Risk Index (ERI) specifically accounts for human pressures on aquatic ecosystems. The ERI is determined by the phosphorus contribution to aquatic environments, derived from urban effluents and the excess nutrients (phosphorus and nitrogen) applied to the soil, measured in tons per hectare per year (Ton ha⁻¹ year⁻¹). To calculate the ERI for the Cerrado and Caatinga, we employed an equation with two main components: one concerning nutrient loss from agricultural systems and the other related to nutrient loss in wastewater.</span></p> <p><strong><span>Nutrient Loss in Agricultural Areas:</span></strong><span><br>Nutrient loss from agricultural areas was estimated using a spatially explicit soil nutrient balance model, incorporating secondary data sources and land use and land cover maps of the study area. For this analysis, we assumed that the nutrient balance in the soil is the difference between total inputs (IN) and total outputs (OUT), where IN includes chemical and organic fertilizers and OUT represents agricultural products. A positive nutrient balance, or surplus, indicates potential nutrient loss that could impact adjacent ecosystems. In our calculations, we also considered phosphorus saturation levels as a risk factor for phosphorus loss, alongside soil types.</span></p> <p><strong><span>Nutrient Loss in Wastewater:</span></strong><span><br>Nutrient loss in wastewater was based on data from the National Water and Sanitation Agency. This method considers the nutrient content in untreated wastewater and in effluents from wastewater treatment plants. We assumed a constant treatment efficiency of 30%, although this value may be optimistic given the primary effluent treatment processes in Brazil. For future assessments, local data on sewage treatment plants could be incorporated into the calculations if available during the project's execution.</span></p> <p><span>This dataset includes empirical data and model simulations developed under the NEXUS project (</span><a href="https://nexus.ccst.inpe.br/" target="_new"><span>https://nexus.ccst.inpe.br/</span></a><span>), which analyzed the interrelationship and challenges of agricultural production, energy, and water resource use in the Caatinga and Cerrado regions. Conducted between 2018 and 2024, the NEXUS project employed a participatory multiscale approach, combining qualitative and quantitative methods from natural and social sciences. Over its six-year duration, the project engaged more than one hundred stakeholders from various sectors, producing diagnostics and scenarios for sustainable futures in these biomes.</span></p> <p><strong><span>Scenarios Descriptions:</span></strong><span><br>The “Green Transition” scenario aligns with the dominant sustainability narrative in the business sector, focusing on efficiency gains and technological solutions (e.g., low-carbon agriculture, energy transition led by large corporations) to address environmental challenges. This scenario envisions agricultural production concentrated in highly productive areas, facilitating the restoration of natural vegetation and fostering an increasingly urban future.</span></p> <p><span>Conversely, the “Lives in Balance” scenario reflects the aspirations and struggles of social movements and traditional communities for recognition and the coexistence of diverse ways of life. It advocates transforming production systems, particularly through decentralized food and energy production, and emphasizes strengthening family farming and agroecological systems.</span></p> <p> </p> <p><strong><span>Acknowledgements</span></strong><span><br>The authors would like to thank the NEXUS Project, funded by the São Paulo Research Foundation – FAPESP (grants 2022/00917-0 and 2017/22269-2), and the Coordination for the Improvement of Higher Education Personnel (CAPES) for their support to Marcela Miranda through the National Postdoctoral Program (grants 88882.317530/2019-1 and 1732909/2017-2).</span></p>
Pathways of methane removal in the sediment and water column of a seasonally anoxic eutrophic marine basin - dataset
<p>Dataset used in the article: "Pathways of methane removal in the sediment and water column of a seasonally anoxic eutrophic marine basin", Zygadlowska et al., 2023.</p>
Figure 1 in Impact of the bird-manure caused eutrophication on the abundance and diversity of chironomid larvae (Diptera; Chironomidae) in lakes of the Bolshoy Aynov Island (Russia, Barents Sea)
Figure 1. Landscape of the Greater Ainu Island.
Eutrophication decreases ecological resilience by reducing species diversity and altering functional traits of submerged macrophytes
<p><span>Positive feedback is key to producing alternative stable states and largely determines ecological resilience in response to external perturbations. Understanding the positive feedback mechanisms in macrophyte-dominated lakes is crucial for resilience-based management and restoration. Based on the field investigation of submerged macrophyte communities in 35 lakes in China, we found that morphological complexity (<em>MC</em>) and morphological plasticity (<em>MP</em>) are correlated with the stoichiometric homeostasis of phosphorus (<em>H<sub>P</sub></em>) and are related to ecosystem structure, functioning, and stability. We also found that the positive feedback strength of lakes dominated by macrophytes is biomass- and diversity-dependent. Eutrophication can decrease the community biomass by decreasing community<em> MC, MP,</em> and <em>H<sub>P</sub></em> and the species diversity through low-light availability, ultimately decreasing the positive feedback strength and resilience of clear-water states. We argue that functional traits and species diversity should be considered to build more resilient ecosystems in future changing environment scenarios.</span></p>
Eutrophication, water quality, and fisheries: a wicked management problem with insights from a century of change in Lake Erie
<p>The datasets here were used to examine relationships between the overall productivity of Lake Erie and the commercial harvest of lake whitefish (<em>Coregonus clupeaformis</em>), walleye (<em>Sander vitreus</em>), and yellow perch (<em>Perca flavescens</em>) during 1915–2011. Here, we provide the two datasets used in the paper by Sinclair et al. titled "Eutrophication, water quality, and fisheries: a wicked management problem with insights from a century of change in Lake Erie". Each dataset is provided as a separate tab in a single Excel worksheet. The first dataset ("Productivity") provides the annual values of the five metrics used to develop the index of overall Lake Erie productivity. The second dataset ("Commercial harvest") provides the total annual commercial harvest (kg) of the three fish species, which were obtained from the Great Lakes Fishery Commission (<a href="http://www.glfc.org/great-lakes-databases.php">http://www.glfc.org/great-lakes-databases.php</a>). A summary and explanation of each variable is provided in the "Info" tab. Further information on how values were calculated (and transformed if necessary) is provided in either the info tab or the methods and supporting information of the associated article.</p>
On the biodiversity of diatom communities in lakes of east China: Geochemical effects dominated after eutrophication
<p><strong>Aim:</strong> Over the last century, lakes all over the world have experienced significant eutrophication and become more susceptible to critical transitions. This has prompted a growing need to understand how community dynamics shift following ecological perturbations. This study aims to elucidate the present status, spatial patterns and determinants of biological diversity, and how they have changed in response to alterations driven by eutrophication.</p> <p><strong>Location:</strong> Lakes of East China, mostly in the Yangtze River Basin</p> <p><strong>Taxa:</strong> Bacillariophyceae (163 species in 33 genres) </p> <p><strong>Methods:</strong> The environmental conditions of over sixty lakes were assessed based on parameters such as water quality, physical characteristics and biogeochemical constituents. Surface sediment samples and high-resolution sediment records were collected to quantify the biodiversity of diatom communities, and Principle Component Analysis (PCA) was used to determine the major environmental gradients. Meanwhile, linear regression, Canonical Correlation Analysis and Mantel tests were used to quantify the correlations between variables.</p> <p><strong>Results:</strong> Biodiversity metrics showed no distinct geographic patterns, although areas near large lakes showed comparatively high evenness. Smaller pairwise dissimilarities were observed among hypereutrophic lakes in comparison to lakes with a lower trophic status. The past century has witnessed a decrease in both pairwise dissimilarity and the standard deviation of Evenness. A significant statistical association was found between dissimilarity and ionic concentration and composition in the surface sediment of lakes, rather than nutrient levels.</p> <p><strong>Main conclusions:</strong> Following regional eutrophication and human disturbance, a significant reduction in biodiversity differentiation was observed in lakes located in East China. Currently, the dominant factor in determining the beta diversity of diatom communities is geochemical conditions rather than nutrient concentrations. Long-term stress caused by cultural eutrophication may also have altered the dominant determinant of regional biodiversity and diatom community dynamics.</p>
Eutrophication, water quality, and fisheries: a wicked management problem with insights from a century of change in Lake Erie
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Density-driven facilitations increase ecological resilience under eutrophic stress
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Wetlands as a potential multi-functioning tool to mitigate eutrophication and brownification
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Data from: Human eutrophication drives biogeographic saltmarsh productivity patterns in China
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Particulate organic carbon sedimentation triggers lagged methane emissions in a eutrophic reservoir
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Scrub encroachment promotes biodiversity in temperate European wetlands under eutrophic conditions
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Water level drawdown and perennial vegetation impact litter decomposition in the sediment of a eutrophic wetland in the Netherlands
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Fast and furious: Early differences in growth rate drive short-term plant dominance and exclusion under eutrophication
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A 140-year paleolimnological record of climatically and anthropogenically driven eutrophication in Utikuma Lake, Alberta, Canada
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On the biodiversity of diatom communities in lakes of east China: Geochemical effects dominated after eutrophication
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