State of eutrophication indicates

• • We summarize the potential factors leading water quality degradation. • • Indices for lake trophic status and water quality are summarized. • • We describe the nutrients transformation and mechanisms of eutrophication. • • Countermeasures to maintain the sustainable development in watershed are provided. • • A framework for an early warning system of eutrophication occurrence is present. Some wastewater sources, such as agricultural waste and runoff, and industrial sewage, can degrade water quality. This study summarises the sources and corresponding mechanisms that trigger eutrophication in lakes. Additionally, the trophic status index and water quality index (WQI) which are effective tools for evaluating the degree of eutrophication of lakes, have been discussed. This study also explores the main nutrients (nitrogen and phosphorus) driving transformations in the water body and sediment. Lake Erhai was used as a case study, and it was found to be in a mesotrophic state, with N and P co-limitation before 2006, and only P limitation since 2006. Finally, effective measures to maintain sustainable development in the watershed are proposed, along with a framework for an early warning system adopting the latest technologies (geographic information systems (GIS), remote sensing (RS)) for preventing eutrophication.

• Home • IN BRIEF findings & basics • Summary of findings • Our Baltic Sea • Conclusions & future outlook • HUMAN WELFARE & ecosystem health • Links between activities & environment • Economic benefits from protection & use of the sea • PRESSURES & their status • Eutrophication • Hazardous substances • Marine litter • Underwater sound • Non-indigenous species • Fishing & hunting • Seabed loss and disturbance • BIODIVERSITY & its status • Benthic habitats • Pelagic habitats • Fish • Marine mammals • Waterbirds • Biodiversity summary & food webs • CUMULATIVE IMPACTS • HELCOM ACTIONS for improvement • ABOUT HELCOM & the assessment • Downloads & data • References • Acknowledgements • Regional consultation • Contact The Baltic Sea still suffers from eutrophication. Excessive input of nutrients to the marine environment enhances the growth of phytoplankton, leading to reduced light conditions in the water, oxygen depletion at the seafloor (as excessive primary producers are degraded), and a cascade of other ecosystem changes. The Baltic Sea still suffers from eutrophication. Excessive input of nutrients to the marine environment enhances the growth of phytoplankton, leading to reduced light conditions in the water, oxygen depletion at the seafloor (as excessive primary producers are degraded), and a cascade of other ecosystem changes. At least 97 percent of the region was assessed as eutrophied in 2011–2016 according to the integrated status assessment. Nutrient inputs from land...

On the hydrological map of the world eutrophication has become the primary water quality issue. The excessive enrichment of waters with anthropogenic sources of nutrients especially nitrogen (N) and phosphorus (P) lead to the transformation of oligotrophic water bodies to mesotrophic, eutrophic, and finally hypertrophic. Mesotrophic and eutrophic phases exhibit intermediate and rich levels of nutrients and show increasing and serious water quality problems, respectively. Eutrophication restricts water use for fisheries, recreation, industry, and drinking because of increased growth of undesirable algae and aquatic weeds and the oxygen shortages caused by their death and decomposition. Associated periodic surface blooms of cyanobacteria (blue-green algae) occur in drinking water supplies and may pose a serious health hazard to animals and humans. Anthropogenic activities are the worst culprit of nutrient enrichment and root cause of eutrophication of water bodies. Excess nutrient inputs to water bodies usually come from sewage, industrial discharges, agricultural runoff, construction sites, and urban areas. Eutrophication can be minimized by regulating the nutrient sources, reducing the use of fertilizers, proper soil management practices, implementing mathematical models, phytoremediation etc. Among these, public awareness of eutrophication can play an important role in preventing the eutrophication of water bodies. Keywords • Eutrophication • Fertilizers • Livestock inten...

Even though human-induced eutrophication has severely impacted temperate lake ecosystems over the last centuries, the effects on total organic carbon (TOC) burial and mineralization are not well understood. We study these effects based on sedimentary records from the last 180 years in five Swiss lakes that differ in trophic state. We compare changes in TOC content and modeled TOC accumulation rates through time to historical data on algae blooms, water column anoxia, wastewater treatment, artificial lake ventilation, and water column phosphorus (P) concentrations. We furthermore investigate the effects of eutrophication on rates of microbial TOC mineralization and vertical distributions of microbial respiration reactions in sediments. Our results indicate that the history of eutrophication is well recorded in the sedimentary record. Overall, eutrophic lakes have higher TOC burial and accumulation rates, and subsurface peaks in TOC coincide with past periods of elevated P concentrations in lake water. Sediments of eutrophic lakes, moreover, have higher rates of total respiration and higher contributions of methanogenesis to total respiration. However, we found strong overlaps in the distributions of respiration reactions involving different electron acceptors in all lakes regardless of lake trophic state. Moreover, even though water column P concentrations have been reduced by ∼ 50 %–90 % since the period of peak eutrophication in the 1970s, TOC burial and accumulation rate...

Marine pollution is an introduction by humans, directly or indirectly, of substances or energy into marine environments (including estuaries) resulting in such deleterious effects as harm to living resources, hazards to human health, hindrance of marine activities including fishing, impairment of quality for use of sea, and reduction of amenities. Eutrophication process or the enrichment of dissolved nutrients (nitrogen and phosphorous) in aquatic systems (coastal or freshwater) is frequently due to the runoff from the land. These nutrient inputs contribute to the increase of phytoplankton, toxic algae and cyanobacterial blooms, lack of oxygen (hypoxia and/or anoxia events), and massive fish mortality with negative consequences for water quality and aquatic biodiversity. Trophic state indexes refer to a quantitative expression (e.g. arithmetic combination) calculated with water quality... • Acha EM, Mianzán H, Guerrero R et al (2009) An overview of physical and ecological processes in the Río de la Plata Estuary. ContShelf Res 28:1579–1588 • Achkar M, Domínguez A, Pesce F (2012) Cuenca del Río Santa Lucía – Uruguay Aportes para la discusión ciudadana. REDES Amigos de la Tierra Uruguay, Montevideo • Anguiano-Cuevas JR, Olivos-Ortiz A, Cervantes OSA et al (2015) Evaluation of trophicstate in the Palo Verde estuary (Colima, México), action to regulating agricultural activities. J Integr Coast Zone Mana 15(4):507–522. • Aldabe J, Mejía P, Morena V (2009) Propuesta de Proyecto ...

• 18 February 2020 Pattern of the state of eutrophication in the floodplain wetlands of eastern India in context of climate change: a comparative evaluation of 27 wetlands • ORCID: orcid.org/0000-0002-6115-9838 • ORCID: orcid.org/0000-0001-8166-4375 • • • ORCID: orcid.org/0000-0001-7205-9034 • • … • ORCID: orcid.org/0000-0002-6629-8992 Show authors Environmental Monitoring and Assessment volume 192, Article number: 183 ( 2020) The floodplain wetlands in different regional settings vary with time and space in terms of function and geomorphological diversity. In recent decades, these eco-sensitive waterbodies have been exposed to a wide range of anthropogenic threats and climatic changes. Therefore, assessment of these ecological and environmental threats is prerequisite to understand the state of ecosystem and to develop a sustainable management strategy for conservation of wetland biodiversity and fisheries enhancement. This paper discusses the region-specific pattern of trophic state index (TSI) of the 27 floodplain wetlands in West Bengal, India. Carlson TSI and Lamparelli TSI methods were used to determine a better approach based on historical and continuous dataset and to delineate the interrelationship among historical climatic variability for sustainable management of the resources. The study revealed that agro-climatic divisions do not unveil any significant impact on the TSI calculated using Carlson TSI as well as Lamparelli TSI method. The TSI scores for the two m...