Consulta: subjectFacets:"Eutrophication"
Registros recuperados: 154
Data/hora: 15/06/2024 15:35:54

Índice de salinidad de la red hidrográfica del estado de Morelos, México
Provedor de dados: 32
Autores: Ramírez García, Jazmin.
En la Red Hidrográfica del estado de Morelos el agua ocupa un lugar primordial, su disponibilidad y riqueza ha constituido un elemento de soporte básico para el desarrollo económico. Alrededor de 63000 hectáreas son irrigadas en Morelos y dado que las actividades agropecuarias, industriales y recreacionales compiten por este recurso, se hace necesario conocer las características químicas de las aguas y los efectos adversos sobre los terrenos en donde se aplican. Los objetivos de este trabajo fueron determinar las concentraciones iónicas del sistema y establecer índices para conocer el efecto sobre las propiedades físicas de los suelos. Se colectaron muestras de agua en 66 estaciones durante julio de 2007 y 78 en mayo de 2008 (primer y segundo muestreo...
Tipo: Tesis
Palavras-chave: Calidad del agua; Riego; Eutrofización; Sodicidad; RAS; PSI; Maestría; Hidrociencias; Quality of the water; Watering; Eutrophication; Sodicity; SAR; ESP.
Ano: 2009
URL: http://hdl.handle.net/10521/1621

Biological Diversity and Resilience: Lessons from the Recovery of Cichlid Species in Lake Victoria
Provedor de dados: 7
Autores: Awiti, Alex O; The Aga Khan University, Faculty of Arts and Sciences (East Africa); aawiti@gmail.com.
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Eutrophication; Lake Victoria; Nile perch; Recovery of haplochromine cichlids; Resilience; Response diversity.
Ano: 2011

Coupled human and natural system dynamics as key to the sustainability of Lake Victoria&amp;#8217;s ecosystem services
Provedor de dados: 7
Autores: Downing, Andrea S.; Stockholm Resilience Centre, Stockholm University, Sweden; Aquatic Ecology and Water Quality Management group, Wageningen  University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands ; andrea.downing@su.se; van Nes, Egbert H.; Aquatic Ecology and Water Quality Management group, Wageningen  University, Netherlands ; Egbert.vannes@wur.nl; Balirwa, John S.; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; jbalirwa@yahoo.com; Beuving, Joost; Department of Cultural Anthropology and Development Studies, Faculty of   Social Sciences, Radboud University, Nijmegen, Netherlands ; joostbeuving@gmail.com; Bwathondi, P.O.J.; University of Dar es Salaam, College of Natural and Applied Sciences,   Department of Aquatic Sciences and Fisheries, Dar es Salaam, Tanzania ; bwathondi@yahoo.co.uk; Chapman, Lauren J.; Department of Biology, McGill University, Montreal, Canada; lauren.chapman@mcgill.ca; Cornelissen, Ilse J. M.; Aquaculture &amp; Fisheries Group, Wageningen University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; ilsecornelissen@hotmail.com; Cowx, Iain G.; Hull International Fisheries Institute, University of Hull, United Kingdom; I.G.Cowx@hull.ac.uk; Goudswaard, Kees P. C.; Institute for Marine Resource and Ecosystem Studies (IMARES), Wageningen University, Yerseke, Netherlands; kees.goudswaard@wur.nl; Hecky, Robert E.; Biology Department and Large Lakes Observatory, University of Minnesota-Duluth, USA; rehecky@gmail.com; Janse, Jan H.; Netherlands Environmental Assessment Agency (PBL), Bilthoven, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; JH.Janse@rivm.nl; Janssen, Annette B. G.; Aquatic Ecology and Water Quality Management group, Wageningen  University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; A.Janssen@nioo.knaw.nl; Kaufman, Les; Boston University Marine Program, Biology Department, Boston University, USA ; lesk@bu.edu; Kishe-Machumu, Mary A.; Tanzania Fisheries Research Institute (TAFIRI), Dar es Salaam, Tanzania; mkishe@yahoo.com; Kolding, Jeppe; Department of Biology, University of Bergen, Norway; jeppe.kolding@bio.uib.no; Ligtvoet, Willem; Netherlands Environmental Assessment Agency (PBL), The Hague, Netherlands; Willem.Ligtvoet@pbl.nl; Mbabazi, Dismas; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; mbabazidismas@yahoo.com; Medard, Modesta; Department of Sociology of Development and Change. Social Science Group, Wageningen University, Netherlands ; modesta.medard@wur.nl; Mkumbo, Oliva C.; Lake Victoria Fisheries Organisation, Jinja, Uganda; ocmkumbo@lvfo.org; Mlaponi, Enock; Tanzania Fisheries Research Institute (TAFIRI), Mwanza, Tanzania; emlaponi@yahoo.com; Munyaho, Antony T.; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; ataabum@yahoo.com; Nagelkerke, Leopold A. J.; Aquaculture &amp; Fisheries Group, Wageningen University, Netherlands; leo.nagelkerke@wur.nl; Ogutu-Ohwayo, Richard; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; ogutuohwayo@yahoo.com; Ojwang, William O.; Kenya Marine and Fisheries Research Institute (KMFRI), Kisumu, Kenya; w_ojwang@yahoo.com; Peter, Happy K.; Aquaculture &amp; Fisheries Group, Wageningen University, Netherlands; Happy.Peter@wur.nl; Schindler, Daniel E.; Aquatic &amp; Fishery Sciences/Department of Biology, University of Washington, USA; deschind@uw.edu; Seehausen, Ole; Eawag, Kastanienbaum, Switzerland; Ole.Seehausen@eawag.ch; Sharpe, Diana; Smithsonian Tropical Research Institute, Panama City, Panama; Department of Biology, McGill University, Montreal, Canada; diana.sharpe@gmail.com; Silsbe, Greg M.; Royal Netherlands Institute for Sea Research, Yerseke, Netherlands; Greg.Silsbe@nioz.nl; Sitoki, Lewis; The Technical University of Kenya, Nairobi, Kenya; Sitoki@hotmail.com; Tumwebaze, Rhoda; National Fisheries Resources Research Institute (NaFIRRI), Jinja, Uganda; t60rhoda@gmail.com; Tweddle, Denis; South African Institute for Aquatic Biodiversity, Grahamstown, South Africa; D.Tweddle@saiab.ac.za; van de Wolfshaar, Karen E.; Institute for Marine Resource and Ecosystem Studies (IMARES), Wageningen University, Ijmuiden, Netherlands; karen.vandewolfshaar@wur.nl; van Dijk, Han; Department of Sociology of Development and Change. Social Science Group, Wageningen University, Netherlands ; han.vandijk@wur.nl; van Donk, Ellen; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands; E.vandonk@nioo.knaw.nl; van Rijssel, Jacco C.; Institute of Biology, University of Leiden, Netherlands; Naturalis Biodiversity Center, Leiden, Netherlands; Eawag, Kastanienbaum, Switzerland; j.c.van.rijssel@biology.leidenuniv.nl; van Zwieten, Paul A. M.; Aquaculture &amp; Fisheries Group, Wageningen University, Netherlands; paul.vanzwieten@wur.nl; Wanink, Jan; Institute of Biology, University of Leiden, Netherlands; Koeman en Bijkerk bv, Ecological Research and Consultancy, Haren, Netherlands; j.h.wanink@koemanenbijkerk.nl; Witte, F.; Institute of Biology, University of Leiden, Netherlands; Naturalis Biodiversity Center, Leiden, Netherlands;; Mooij, Wolf M.; Aquatic Ecology and Water Quality Management group, Wageningen  University, Netherlands; Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands ; w.mooij@nioo.knaw.nl.
East Africa&amp;#8217;s Lake Victoria provides resources and services to millions of people on the lake&amp;#8217;s shores and abroad. In particular, the lake&amp;#8217;s fisheries are an important source of protein, employment, and international economic connections for the whole region. Nonetheless, stock dynamics are poorly understood and currently unpredictable. Furthermore, fishery dynamics are intricately connected to other supporting services of the lake as well as to lakeshore societies and economies. Much research has been carried out piecemeal on different aspects of Lake Victoria&amp;#8217;s system; e.g., societies, biodiversity, fisheries, and eutrophication. However, to disentangle drivers and dynamics of change in this complex system, we need...
Tipo: Peer-Reviewed Reports
Palavras-chave: Eutrophication; Feedbacks; Fisheries; Lake Victoria; Model; Multidisciplinary  social-ecological system; Sustainability.
Ano: 2014

Nitrogen Source Apportionment for the Catchment, Estuary, and Adjacent Coastal Waters of the River Scheldt
Provedor de dados: 7
Autores: Vermaat, Jan E; Earth Sciences and Economics, Faculty of Earth and Life Sciences, VU University; j.e.vermaat@vu.nl; Broekx, Steven; Flemish Institute for Technological Research (VITO); steven.broekx@vito.be; Van Eck, Bert; Deltares; Bert.vanEck@deltares.nl; Engelen, Guy; Flemish Institute for Technological Research (VITO); guy.engelen@vito.be; Hellmann, Fritz; Institute for Environmental Studies (IVM), VU University; f.a.hellmann@vu.nl; De Kok, Jean Luc; Flemish Institute for Technological Research (VITO); Jean-Luc.DeKok@vito.be; Van der Kwast, Hans; Flemish Institute for Technological Research (VITO); hans.vanderkwast@vito.be; Maes, Joachim; Joint Research Centre-European Commission; joachim.maes@jrc.ec.europa.eu; Salomons, Wim; Institute for Environmental Studies (IVM), VU University; wim.salomons@home.nl; Van Deursen, Willem; PCRaster; willem@pcraster.nl.
Using the systems approach framework (SAF), a coupled model suite was developed for simulating land-use decision making in response to nutrient abatement costs and water and nutrient fluxes in the hydrological network of the Scheldt River, and nutrient fluxes in the estuary and adjacent coastal sea. The purpose was to assess the efficiency of different long-term water quality improvement measures in current and future climate and societal settings, targeting nitrogen (N) load reduction. The spatial-dynamic model suite consists of two dynamically linked modules:  PCRaster is used for the drainage network and is combined with ExtendSim modules for farming decision making and estuarine N dispersal. Model predictions of annual mean flow and total N...
Tipo: Peer-Reviewed Reports
Palavras-chave: Catchment hydrology; Coupled modeling; Estuary; Eutrophication; Land use; Systems analysis; Watershed nutrient loading.
Ano: 2012

Zebra Mussel Farming in the Szczecin (Oder) Lagoon: Water-Quality Objectives and Cost-Effectiveness
Provedor de dados: 7
Autores: Schernewski, Gerald; Leibniz-Institute for Baltic Sea Research; schernewski@eucc-d.de; Stybel, Nardine; EUCC - The Coastal Union Germany; stybel@eucc-d.de; Neumann, Thomas; Leibniz-Institute for Baltic Sea Research; thomas.neumann@io-warnemuende.de.
The Oder (Szczecin) Lagoon in the southern Baltic Sea is a heavily eutrophicated and degraded coastal ecosystem. We applied a systems approach framework to critically evaluate whether existing water-management measures achieve water-quality objectives for the river and lagoon systems. Our simulations reveal that the existing water-quality objectives for the river and the coastal waters are not sufficiently complementary. We suggest new water-quality threshold concentrations, which are in agreement with the European Water Framework Directive, and we calculate acceptable maximum nutrient loads for the Oder River. These calculations suggest that external nutrient-load reductions in the river basin alone seem insufficient to achieve good water quality in the...
Tipo: Peer-Reviewed Reports
Palavras-chave: Baltic Sea Action Plan; Coastal ecosystem; Cost-benefit analysis; ERGOM; Eutrophication; Marginal costs; Mussel farming; Nitrogen; Oder Lagoon; Oder River; Phosphorus; Szczecin Lagoon; Water Framework Directive; Water management; Water quality; Zebra mussels (Dreissena polymorpha).
Ano: 2012

The Cost of Restoration as a Way of Defining Resilience: a Viability Approach Applied to a Model of Lake Eutrophication
Provedor de dados: 7
Autores: Martin, Sophie; Cemagref; sophie.martin@cemagref.fr.
Multiple stable states or alternative equilibria in ecological systems have been recognized since the 1960s in the ecological literature. Very often, the shift between alternative states occurs suddenly and the resource flows from these systems are modified. Resilience is the capacity of a system to undergo disturbance and maintain its functions and controls. It has multiple levels of meaning, from the metaphorical to the specific. However, most studies that explore resilience-related ideas have used resilience as a metaphor or theoretical construct. In a few cases, it has been defined operationally in the context of a model of a particular system. In this paper, resilience is defined consistently with the theoretical uses of the term, in the context of...
Tipo: Peer-Reviewed Reports
Palavras-chave: Dynamic systems; Ecosystem models; Eutrophication; Lake ecosystem; Resilience; Time of crisis.
Ano: 2004

Resilience and Restoration of Lakes
Provedor de dados: 7
Autores: Carpenter, Stephen R; University of Wisconsin-Madison; srcarpen@wisc.edu; Cottingham, Kathryn L; ; cottingh@nceas.ucsb.edu.
Lake water quality and ecosystem services are normally maintained by several feedbacks.  Among these are nutrient retention and humic production by wetlands, nutrient retention and woody habitat production by riparian forests, food web structures that cha nnel phosphorus to consumers rather than phytoplankton, and biogeochemical mechanisms that inhibit phosphorus recycling from sediments.  In degraded lakes, these resilience mechanisms are replaced by new ones that connect lakes to larger, regional economi c and social systems.  New controls that maintain degraded lakes include runoff from agricultural and urban areas, absence of wetlands and riparian forests, and changes in lake food webs and biogeochemistry that channel phosphorus to blooms of nuisance...
Tipo: Peer-Reviewed Reports
Palavras-chave: Ecological economics; Ecosystem; Eutrophication; Lake; Resilience; Restoration; Watershed.
Ano: 1997

Mussel Production and Water Framework Directive Targets in the Limfjord, Denmark: an Integrated Assessment for Use in System-Based Management
Provedor de dados: 7
Autores: Dinesen, Grete E.; Coastal Ecology Section, National Institute of Aquatic Resources (DTU Aqua), Technical University of Denmark; gdi@aqua.dtu.dk; Timmermann, Karen; AU NERI, Roskilde;; Roth, Eva; SDU, Esbjerg;; Markager, Stiig; AU NERI, Roskilde;; Ravn-Jonsen, Lars; SDU, Esbjerg;; Hjorth, Morten; AU NERI, Roskilde;; Holmer, Marianne; SDU, Odense;.
Tipo: Peer-Reviewed Reports
Palavras-chave: Aquaculture; Bioeconomical modeling; Blue mussels; Danish estuary; Eutrophication; Fishery; Integrated coastal system assessment; Stakeholder involvement.
Ano: 2011

Achieving good environmental status in the Black Sea: scale mismatches in environmental management
Provedor de dados: 7
Autores: O'Higgins, Tim; Scottish Association for Marine Science; Tim.O'Higgins@sams.ac.uk; Farmer, Andrew; Institute for European Environmental Policy; AFarmer@ieep.eu; Daskalov, Georgi; IBER-BAS;; Knudsen, Stale; University in Bergen; stale.knudsen@sosantr.uib.no; Mee, Laurence; Scottish Association for Marine Science; laurence.mee@sams.ac.uk.
The Black Sea has suffered severe environmental degradation.  Governance of the Black Sea region is complex and results in a series of scale mismatches which constrain management.  This paper develops a simple classification of spatial scale mismatches incorporating the driver, pressure, state, welfare, response (DPSWR)  framework.  The scale mismatch classification is applied to two major environmental problems of the Black Sea, eutrophication and small pelagic fisheries.  A number of scale mismatches are described and classified and potential solutions are identified.
Tipo: Peer-Reviewed Reports
Palavras-chave: Black Sea; Ecosystem approach; Eutrophication; Fisheries; Marine strategy framework directive; Scale mismatch.
Ano: 2014

Environmental and Management Constraints on Tourism in Varna Bay, Bulgarian Black Sea Coast
Provedor de dados: 7
Autores: Moncheva, Snejana; IO-BAS; snejanam@abv.bg; Racheva, Eleonora; IO-BAS; ainsteim@abv.bg; Kamburska, Lyudmila; EC DG-JRC, Institute for Environment and Sustainability; lyudmila.kamburska@jrc.it.
We used the systems approach framework (SAF) to study the conflict between the development of tourism and marine environmental quality in Varna Bay, a critical regional policy issue selected for study after stakeholder consultation. Water quality is of central importance to the tourism industry, as a minimum level of water clarity is required to make the water attractive for swimming and bathing. Rampant development of coastal resorts in Varna Bay has led to water-quality deterioration because the tourism capacity has expanded without concurrent increases in the capacity to collect and treat sewage. We used a numerical model to simulate the Secchi depth (as a proxy for transparency) as a function of the nitrogen loading and total suspended solids. The SAF...
Tipo: Peer-Reviewed Reports
Palavras-chave: Black Sea; Coastal tourism; Eutrophication; Simulation models; Systems approach.
Ano: 2012

Development and Use of a Bioeconomic Model for Management of Mussel Fisheries under Different Nutrient Regimes in the Temperate Estuary of the Limfjord, Denmark
Provedor de dados: 7
Autores: Timmermann, Karen; Department of Bioscience, Aarhus University, Roskilde, Denmark; kti@dmu.dk; Dinesen, Grete E.; Section for Coastal Ecology, National Institute of Aquatic Science, Technical University of Denmark, Charlottenlund, Denmark; gdi@aqua.dtu.dk; Markager, Stiig; Department of Bioscience, Aarhus University, Roskilde, Denmark; markager@dmu.dk; Ravn-Jonsen, Lars; Department of Environmental and Business Economics, University of Southern Denmark, Esbjerg, Denmark; lrj@sam.sdu.dk; Bassompierre, Marc; Novo Nordisk A/S, Kalundborg, Denmark; mbass@post9.tele.dk; Roth, Eva; Department of Environmental and Business Economics, University of Southern Denmark, Esbjerg, Denmark; er@sam.sdu.dk.
Coastal ecosystems worldwide are under pressure from human-induced nutrient inputs, fishing activities,  mariculture, construction work, and climate change. Integrated management instruments handling one or more of these problems in combination with socioeconomic issues are therefore necessary to secure a sustainable use of resources. In the Limfjord, a temperate eutrophic estuary in Denmark, nutrient load reductions are necessary to fulfill EU regulations such as the Water Framework Directive (WFD). The expected outcome of these load reductions is an improved water quality, but also reduced production of the abundant stock of filter-feeding blue mussels, Mytilus edulis. This is expected to have significant economic consequences for the million-euro mussel...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: Decision support system; Ecological-socioeconomic model; Eutrophication; Mussel production; Nutrient loading; Predictive models; System-based management; Water Framework Directive.
Ano: 2014

Managing the Resilience of Lakes: A Multi-agent Modeling Approach
Provedor de dados: 7
Autores: Janssen, Marco A; Indiana University; maajanss@indiana.edu; Carpenter, Stephen R; University of Wisconsin-Madison; srcarpen@wisc.edu.
We demonstrate an approach for integrating social and ecological models to study ecosystem management strategies. We focus on the management of lake eutrophication. A model has been developed in which the dynamics of the lake, the learning dynamics of society, and the interactions between ecology and society are included. Analyses with the model show that active learning is important to retain the resilience of lakes. Although very low levels of phosphorus in the water will not be reached, active learning reduce the chance of catastrophic high phosphorus levels.
Tipo: Peer-Reviewed Reports
Palavras-chave: Active learning; Eutrophication; Integrated modeling; Lake dynamics; Lake management; Multi-agent modeling; Phosphorus; Resilience; Restoration; Simulation.
Ano: 1999

Uncertainty in Discount Models and Environmental Accounting
Provedor de dados: 7
Autores: Ludwig, Donald; University of British Columbia; Ludwig@math.ubc.ca; Brock, William A.; University of Wisconsin-Madison; WBrock@ssc.wisc.edu; Carpenter, Stephen R; University of Wisconsin-Madison; srcarpen@wisc.edu.
Cost-benefit analysis (CBA) is controversial for environmental issues, but is nevertheless employed by many governments and private organizations for making environmental decisions.  Controversy centers on the practice of economic discounting in CBA for decisions that have substantial long-term consequences, as do most environmental decisions.  Customarily, economic discounting has been calculated at a constant exponential rate, a practice that weights the present heavily in comparison with the future.  Recent analyses of economic data show that the assumption of constant exponential discounting should be modified to take into account large uncertainties in long-term discount rates. A proper treatment of this uncertainty requires that we consider returns...
Tipo: Peer-Reviewed Insight
Palavras-chave: Atlantic right whale; Cost-benefit analysis; Discounting; Ecological economics; Ecosystem service; Eutrophication; Renewable resource; Uncertainty.
Ano: 2005

Plausible futures of a social-ecological system: Yahara watershed, Wisconsin, USA
Provedor de dados: 7
Autores: Carpenter, Stephen R; Center for Limnology, University of Wisconsin-Madison; srcarpen@wisc.edu; Booth, Eric G.; Department of Agronomy, University of Wisconsin-Madison; Department of Civil and Environmental Engineering, University of Wisconsin-Madison; egbooth@wisc.edu; Gillon, Sean; Department of Food Systems and Society, Marylhurst University; Department of Forest and Wildlife Ecology, University of Wisconsin-Madison; sgillon@marylhurst.edu; Kucharik, Christopher J.; Department of Agronomy, University of Wisconsin-Madison; Nelson Institute Center for Sustainability and the Global Environment, University of Wisconsin-Madison; kucharik@wisc.edu; Loheide, Steven; Department of Civil and Environmental Engineering, University of Wisconsin-Madison; Loheide@wisc.edu; Mase, Amber S.; Department of Forest and Wildlife Ecology, University of Wisconsin-Madison; Mase@wisc.edu; Motew, Melissa; Nelson Center for Sustainability and the Global Environment, University of Wisconsin-Madison; Motew@wisc.edu; Qiu, Jiangxiao; Department of Zoology, University of Wisconsin-Madison; jqiu7@wisc.edu; Rissman, Adena R; Department of Forest and Wildlife Ecology, University of Wisconsin-Madison; ARRissman@wisc.edu; Seifert, Jenny; Center for Limnology, University of Wisconsin-Madison; JSeifert2@wisc.edu; Soylu, Evren; Department of Civil Engineering, Meliksah University; Nelson Institute for Sustainability and the Global Environment, University of Wisconsin-Madison; evrensoylu@gmail.com; Turner, Monica; Department of Zoology, University of Wisconsin-Madison; turnermg @ wisc.edu; Wardropper, Chloe B; Nelson Institute for Environmental Studies, University of Wisconsin-Madison; Wardropper@wisc.edu.
Agricultural watersheds are affected by changes in climate, land use, agricultural practices, and human demand for energy, food, and water resources. In this context, we analyzed the agricultural, urbanizing Yahara watershed (size: 1345 km&amp;#178;, population: 372,000) to assess its responses to multiple changing drivers. We measured recent trends in land use/cover and water quality of the watershed, spatial patterns of 10 ecosystem services, and spatial patterns and nestedness of governance. We developed scenarios for the future of the Yahara watershed by integrating trends and events from the global scenarios literature, perspectives of stakeholders, and models of biophysical drivers and ecosystem services. Four qualitative scenarios were created to...
Tipo: Peer-Reviewed Reports
Palavras-chave: Alternative futures; Climate; Ecosystem services; Eutrophication; Governance; Lakes; Land-use change; Phosphorus; Scenarios.
Ano: 2015

Regime Shifts and Ecosystem Service Generation in Swedish Coastal Soft Bottom Habitats: When Resilience is Undesirable
Provedor de dados: 7
Autores: Troell, Max; Beijer Institute; max@beijer.kva.se; Pihl, Leif; ; l.pihl@kmf.gu.se; Kautsky, Nils; ; nils@ecology.su.se.
Ecosystems can undergo regime shifts where they suddenly change from one state into another. &amp;nbsp;This can have important implications for formulation of management strategies, if system characteristics develop that are undesirable from a human perspective, and that have a high resistance to restoration efforts. This paper identifies some of the ecological and economic consequences of increased abundance of filamentous algae on shallow soft bottoms along the Swedish west coast. It is suggested that a successive increase in the sediment nutrient pool has undermined the resilience of these shallow systems. After the regime shift has occurred, self-generation properties evolve keeping the system locked in a high-density algae state. The structural and...
Tipo: Peer-Reviewed Reports
Palavras-chave: Alternate stable states; Shallow soft bottoms; Eutrophication; Filamentous algal mats; Resilience; Ecosystem function; Ecosystem goods and services.
Ano: 2005

Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
Provedor de dados: 72
Autores: Rabalais,Nancy N.
The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loads of dissolved inorganic nitrogen tripled. There are increases in primary production, shifts in phytoplankton community composition, changes in trophic interactions, and worsening severity of hypoxia. The river-influenced continental shelf is representative of similar ecosystems in which increased nutrient flux to the coastal ocean has resulted in eutrophication and subsequently hypoxia. The hypoxic conditions (dissolved oxygen less than 2 mg L-1) cover up to...
Tipo: Journal article
Palavras-chave: Anoxia; Hypoxia; Eutrophication; Nutrients; Nitrogen.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015

Oxygen deficiency in the north indian ocean
Provedor de dados: 72
Autores: Naqvi,S.W.A.
The Indian Ocean contains one of the oceans' most pronounced oxygen minimum zones (OMZ), which, anomalously, is the most intense in the northwestern sector (Arabian Sea). It also contains the majority of the area of oceanic continental margins in contact with oxygen-depleted waters. Impacts of the oxygen deficiency on regional biogeochemistry, especially anaerobic nitrogen transformations, are described. A comparison of the perennial, mesopelagic OMZ in the open Northwestern Indian Ocean is made with a shallower oxygen deficient system that develops seasonally (during late summer and autumn) over the western Indian shelf. The latter appears to have intensified in recent years presumably due to anthropogenic nutrient loading from land.
Tipo: Journal article
Palavras-chave: Indian Ocean; Nitrogen cycling; Denitrification; N2O; Eutrophication.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300011

ALTERATION OF NITROGEN CYCLING BY AGRICULTURAL ACTIVITIES, AND ITS ENVIRONMENTAL AND HEALTH CONSEQUENCES
Provedor de dados: 73
Autores: Cleemput,Oswald van; Boeckx,Pascal.
The food demands of the increasing world population puts pressure on land use and N availability. In this paper an overview is given of the different N cycling processes affected by agricultural activities. Of the amount of N added to the soil, about half is removed from the field as harvested crop, while the remainder of the N is incorporated into soil organic matter or is lost to other parts of the environment. During the last decades there has been much research on environmental consequences of agricultural activities, mainly on emission of gaseous N compounds (NH3, NO, N2O and N2), but also on N leaching, runoff and erosion. Study of the factors controlling loss of N is complex because of their multiplicity and mutual interactions. More recently...
Tipo: Journal article
Palavras-chave: Acidification; Drinking water; Eutrophication; Greenhouse effect; Nitrogen loss; Ozone.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200005

Фитобентос Большого и Малого филлофорных полей как отражение современного экологического состояния северо-западной части Чёрного моря
Provedor de dados: 13
Autores: Косенко, М. Н.; Миничева, Г. Г.; Швец, А. В.
На основе материала, полученного в международных  рейсах НИС «Академик» (2004, 2006), «Посейдон» (2008) в центральную часть северо-западного  шельфа и в экспедиции НИС «Спрут»  в Каркинитский залив (2008), уточнена современная структурно-функциональная организация и распределение сообществ фитобентоса Большого филлофорного поля (БФП) (Филлофорное поле Зернова) и Малого филлофорного поля (МФП). Из всех черноморских макрофитов виды Phyllophora имеют минимальные значения коэффициентов удельной поверхности и потому наиболее уязвимы при эвтрофировании. В связи с этим морфофункциональная структура сообществ филлофоры использована как наиболее чувствительный индикатор экологического состояния, связанного с уровнем трофности экосистемы. Показано, что при...
Tipo: Journal Contribution
Palavras-chave: Филлофора; Нитчатые водоросли; Морфофункциональные показатели; Эвтрофирование; Phyllophora; Filamentous algae; Morphofunctional parameters; Eutrophication.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/1192

Акватория и берега Севастополя: экосистемные процессы и услуги обществу
Provedor de dados: 13
Autores: Шадрин, Н. В.; Павлова, Е. В.
В монографии представлены результаты изучения современной экологической ситуации в акватории Севастополя. Рассмотрены также вопросы взаимосвязей функционирования экосистем и социально-экономического развития. Для экологов, экономистов, менеджеров, студентов и жителей Севастополя.
Tipo: Book
Palavras-chave: Ecosystems; Scales; Models; Anthropogenic factors; Eutrophication; Ichthyoplankton; Phytoplankton; Zooplankton; Oil pollution; Litter; Mortality; Coastal zone; Biodiversity; Rivers; Zooplankton; Ecosystems; Scales; Models; Eutrophication; Rivers; Biodiversity; Phytoplankton; Anthropogenic factors; Mortality; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_6838; Http://aims.fao.org/aos/agrovoc/c_4881; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_33949; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_34996; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999
URL: http://repository.ibss.org.ua/dspace/handle/99011/381

Тенденции многолетних изменений фитоценозов «цистозирового пояса» Карадагского природного заповедника (Крым, Чёрное море).
Provedor de dados: 13
Autores: Костенко, Н. С.; Дикий, Е. А.; Заклецкий, А. А.
Трансформация цистозировых фитоценозов района Карадага за период 1970 – 2006 гг. может  быть охарактеризована преимущественно как аллогенная деградация. Факторами, угнетающе действующими на фитоценозы цистозиры, вероятнее всего, являются эвтрофирование акваторий и снижение прозрачности  водных масс. Результатом процессов трансформации является формирование на малых глубинах (1 – 2 м) устойчивых фитоценозов с доминированием бурых многолетников и значительной биомассой зелёных и красных мезосапробных водорослей, на глубинах от 3 м и более – формирование переходных растительных ассоциаций с cодоминированием бурых многолетников и сциофильных красных водорослей, а в дальнейшем – полная деградация цистозировых фитоценозов.
Tipo: Journal Contribution
Palavras-chave: Донная растительность; Цистозира; Трансформация сообществ; Эвтрофикация; Прозрачность; Освещённость; Крым; Чёрное море; Bottom vegetation; Macrophytobenthos; Cystoseira; Long-term changes; Eutrophication; Water transparency; Illumination; Crimea; Black Sea; Донна рослинність; Макрофітобентос; Цистозіра; Трансформації фітоценозів; Евтрофування; Прозорість; Освітленість; Крим; Чорне море.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/819

Многолетняя динамика цветения микроводорослей в прибрежной зоне Одесского залива (Чёрное море).
Provedor de dados: 13
Autores: Теренько, Л. М.; Теренько, Г. В.
Проанализированы результаты многолетних собственных исследований и проведено сравнение с литературными данными предыдущих лет о временных изменениях «цветений» воды в северо-западной части Чёрного моря, а также видового состава вызывающих их микроводорослей. Мониторинг проводился в 1995 – 2005 гг. ежемесячно на 5 – 7 станциях, расположенных в прибрежной зоне Одесского залива. Показаны некоторые особенности «цветений» в современный период, а также отмечено увеличение числа токсичных видов-возбудителей «цветений». Приведен список токсичных или потенциально токсичных микроводорослей, развивающихся в данной акватории.
Tipo: Journal Contribution
Palavras-chave: «цветение» воды; Эвтрофирование; «красный прилив»; Виды-вселенцы; Токсичные микроводоросли; Чёрное море; Water blooms; Eutrophication; Red tide; Invasive species; Toxic microalgae; Black Sea; «цвітіння» води; Евтрофування; «червоний прилив»; Види-вселенці; Токсичні мікроводорості; Чорне море.
Ano: 2008
URL: http://repository.ibss.org.ua/dspace/handle/99011/814

Diet of Cnesterodon decemmaculatus (Poeciliidae) and Jenynsia multidentata (Anablepidae) in a hypertrophic shallow lake of Uruguay
Provedor de dados: 76
Autores: Quintans,Federico; Scasso,Flavio; Loureiro,Marcelo; Yafe,Alejandro.
Diet of Cnesterodon decemmaculatus (Jenyns, 1842) and Jenynsia multidentata (Jenyns, 1842) were analysed in Lake Rodó, an urban hypertrophic lake from Montevideo, Uruguay. Both species displayed omnivory. The most consumed items for C. decemmaculatus were zooplankton, periphyton, phytoplankton and detritus; the diet of J. multidentata included zooplankton, insects, crustaceans and juvenile fish. Our results suggest that both species could be acting as facultative planktivores. The fish community of this lake is characterised by the dominance of C. decemmaculatus and J. multidentata. Under this condition, predation on large-bodied zooplankton could indirectly be contributing to maintain a high phytoplankton abundance and a low water transparency.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish feeding; Facultative planktivores; Eutrophication.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000100014

Agricultura e qualidade da agua: contaminacao da agua por nitrato.
Provedor de dados: 14
Autores: RESENDE, A. V. de.
bitstream/CPAC-2009/24718/1/doc_57.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Contamination; Health.; Contaminação; Fósforo; Impacto Ambiental; Nitrogênio; Poluição da Água; Saúde.; Recurso Hídrico; Qualidade da Água; Environmental impact; Eutrophication; Nitrates; Nitrogen; Phosphorus; Water resources.; Water quality; Water pollution.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546464

Two decades of oligotrophication: Evidence for a phytoplankton community shift in the coastal lagoon of Thau (Mediterranean Sea, France)
Provedor de dados: 5
Autores: Derolez, Valerie; Soudant, Dominique; Malet, Nathalie; Chiantella, Claude; Richard, Marion; Abadie, Eric; Aliaume, Catherine; Bec, Beatrice.
Mediterranean costal lagoons have been exposed to anthropic eutrophication for decades. Thau lagoon is one of the largest among them and provides many ecosystem services including shellfish farming. Considerable efforts were made between the 1970s and the late 2000s to improve the wastewater treatment systems in the lagoon watershed. A decrease in nutrient inputs to Thau lagoon was subsequently observed, evidence for the start of a recovery process in Thau lagoon, following oligotrophication. This decrease has significant consequences for ecosystem communities, above all primary producers. In our study, we characterised and quantified long-term changes by analysing long monitoring time-series (1998-2016) of phytoplankton biomass, abundance and composition...
Tipo: Text
Palavras-chave: Eutrophication; Oligotrophication; Nutrients; Recovery; Phytoplankton community shift; Mediterranean coastal lagoon.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74063/73514.pdf

Eutrophication disrupts summer trophic links in an estuarine microbial food web
Provedor de dados: 5
Autores: López-abbate, M.c.; Molinero, Juan-carlos; Barría De Cao, M.s.; Silva, R.; Negri, R.; Guinder, V.a.; Hozbor, M.c.; Hoffmeyer, M.s.
Eutrophication is the most widespread effect of urban development in coastal areas. To elucidate how nutrient loading affects the carbon pathways at the base of food chains, we quantified the carbon transfer among microbial components, from prokaryotes to microzooplankton. For this purpose, we performed two size-fractionation feeding experiments during late summer under moderate (N: 28.5 μM, P: 0.92 μM, Si: 45.8 μM) and severe (N: 173.9 μM, P: 3.5 μM, Si: 67.2 μM) cultural eutrophication in the Bahía Blanca Estuary (Argentina). In both experiments, prokaryotes were largely dominated by heterotrophic forms, small diatoms dominated among autotrophs, and heterotrophic nanoflagellates were the most abundant among protistan grazers. Under severe eutrophication,...
Tipo: Text
Palavras-chave: Eutrophication; Microbial food web; Bacteria; Nanoflagellates; Microzooplankton; Estuaries.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00512/62335/66718.pdf

Green macroalgae blooms (Ulva spp.) influence trophic ecology of juvenile flatfish differently in sandy beach nurseries
Provedor de dados: 5
Autores: Jones, Auriane; Quillien, Nolwenn; Fabvre, Axel; Grall, Jacques; Schaal, Gauthier; Le Bris, Hervé.
Tipo: Text
Palavras-chave: Eutrophication; Foraging behavior; Fish diet; Macrobenthic invertebrates; Stable isotopes; Trophic niche; Pegusa lascaris; Pleuronectes platessa; Scoplithalmus maximus; North-East Atlantic.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00594/70603/68797.pdf

Eutrophication: A new wine in an old bottle?
Provedor de dados: 5
Autores: Le Moal, Morgane; Gascuel-odoux, Chantal; Menesguen, Alain; Souchon, Yves; Etrillard, Claire; Levain, Alix; Moatar, Florentina; Pannard, Alexandrine; Souchu, Philippe; Lefebvre, Alain; Pinay, Gilles.
Eutrophication is one of the most common causes of water quality impairment of inland and marine waters. Its best-known manifestations are toxic cyanobacteria blooms in lakes and waterways and proliferations of green macro algae in coastal areas. The term eutrophication is used by both the scientific community and public policy-makers, and therefore has a myriad of definitions. The introduction by the public authorities of regulations to limit eutrophication is a source of tension and debate on the activities identified as contributing or having contributed decisively to these phenomena. Debates on the identification of the driving factors and risk levels of eutrophication, seeking to guide public policies, have led the ministries in charge of the...
Tipo: Text
Palavras-chave: Eutrophication; Nitrogen; Phosphorus; Algae bloom; Land-sea continuum; Diffuse pollution.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00456/56734/58551.pdf

Modelling green macroalgal blooms on the coasts of Brittany, France to enhance water quality management
Provedor de dados: 5
Autores: Perrot, Thierry; Rossi, Nadege; Menesguen, Alain; Dumas, Franck.
First recorded in the 1970s, massive green macroalgal blooms have since become an annual recurrence in Brittany, France. Eutrophication (in particular to anthropogenic nitrogen input) has been identified as the main factor controlling Ulva ‘green tide’ events. In this study, we modelled Ulva proliferation using a two-dimensional model by coupling hydrodynamic and biological models (coined ‘MARS-Ulves’) for five sites along the Brittany coastline (La Fresnaye Bay, Saint-Brieuc Bay, Lannion Bay, Guissény Bay and Douarnenez Bay). Calibration of the biological model was mainly based on the seasonal variation of the maximum nitrogen uptake rate (VmaxN) and the half-saturation constant for nitrogen (KN) to reproduce the internal nutrient quotas measured in situ...
Tipo: Text
Palavras-chave: 2D model; Ulva; Eutrophication; Brittany coastal waters; Tracers; Nutrient reductions.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28268/26517.pdf

Physiological and behavioral responses of phytoplankton communities to nutrient availability in a disturbed Mediterranean coastal lagoon
Provedor de dados: 5
Autores: Leruste, A.; Pasqualini, V.; Garrido, M.; Malet, Nathalie; De Wit, R.; Bec, Beatrice.
Short-term bioassays were conducted in Biguglia lagoon (Corsica) to study the physiological and behavioral responses of phytoplankton to N- and P-availability. Natural communities were collected in two stations representative of the two sub-basins, at three periods with contrasting environmental characteristics to address the impact of seasonal variability. These samples were separately enriched with a full N and P enrichment, and with enrichments minus N or minus P. Phytoplankton size structuration, diversity, and growth of the total phytoplankton, the micro-, nano- and ultraphytoplankton were evaluated using spectrofluorimetry, and optical microscopy. Results showed that the communities were fueled by NO3− in the wet periods (autumn and spring) and NH4+...
Tipo: Text
Palavras-chave: Growth rate; Dilution experiment; Eutrophication; Functional traits.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00481/59238/61948.pdf

Modélisation du devenir à moyen terme dans l'eau et le sédiment des éléments majeurs (N, P, Si) rejetés par la Seine en Baie de Seine
Provedor de dados: 5
Autores: Cugier, Philippe.
The Bay of Seine is a coastal ecosystem submitted to a large river input (Seine river), which brings important quantities of nutrients. This nutrient enrichment leads to frequent eutrophication events and, from the beginning of the eighties, regular toxic phytoplanktonic (Dynophysis) blooms are observed.  In order to study the nutrient cycles (nitrogen, phosphorus, silica) and their contribution to phytoplanktonic stock regulation, a three dimensional model has been developed, based on the coupling between an hydrodynamic part taking into account sediment dynamics (SAM-3D) and an ecological part, which accounts for the main biological compartments and processes.  This model is able to reproduce the main physical and biological characteristics of the...
Tipo: Text
Palavras-chave: Bay of Seine (France); Dinoflagellates; Nutrients; Nutrients; Eutrophication; Sediments; Hydrodynamic; Mathematical models; Baie de (France); Seine; Dinoflagellés; Diatomées; Nutriments; Eutrophisation; Sédiments (géologie); Hydrodynamique; Modèles mathématiques.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/these-3220.pdf

Évaluation du descripteur 5 « Eutrophisation » en France métropolitaine. Rapport scientifique pour l’évaluation 2018 au titre de la DCSMM
Provedor de dados: 5
Autores: Devreker, David; Lefebvre, Alain.
This report is the second assessment of French marine water eutrophication status (descriptor 5) done in the framework of the MSFD. The goal of this report is to determine if French marine water reach the Good Ecological State as defined by the MSFD. It stands next to the initial evaluation made in 2012, from which it is an update. It introduces the second cycle of the Marine Environment Action Program. It shows that French marine waters, behind the 12 nm line, reach the GES as defined by the MSFD. Problems link to eutrophication occurs in marine waters above the 12 nm, where 6.5% of the area do not reach the GES.
Tipo: Text
Palavras-chave: DCSMM; Eutrophisation; Évaluation; Bon Etat Ecologique; Seuils; Indicateurs; Nutriments; Chlorophylle-a; Oxygène; Turbidité; Macroalgues; Pressions écologiques; MSFD; Eutrophication; Assessment; Good Environmental Status; Thresholds; Indicators; Nutrients; Chlorophyll-a; Oxygen; Turbidity; Macroalgae; Ecological pressures.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00437/54868/56361.pdf

Spatial and temporal extension of eutrophication associated with shrimp farm wastewater discharges in the New Caledonia lagoon
Provedor de dados: 5
Autores: Thomas, Yoann; Courties, Claude; El Helwe, Yasmin; Herbland, Alain; Lemonnier, Hugues.
Shrimp farming in New Caledonia typically uses a flow-through system with water exchange rates as a tool to maintain optimum hydrological and biological parameters for the crop. Moreover, the effluent shows hydrobiological characteristics (minerals, phytoplankton biomass and organic matter) significantly higher than that of the receiving environment. Separate surveys were carried out in a bay (CH Bay) with a medium-size intensive farm (30 ha) (PO) and in a mangrove-lined creek (TE Creek) near a larger semi-intensive farm (133 ha) (SO). Net loads of nitrogen exported from the semi-intensive farm and the intensive farm amounted to 0.68 and 1.36 kg ha(-1) day(-1), respectively. At CH Bay, discharge effects were spatially limited and clearly restricted to...
Tipo: Text
Palavras-chave: Environmental impact; Shrimp farming; Eutrophication; Flow cytometry; New Caledonia.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00014/12527/9882.pdf

When do phytoplankton blooms cause the most intense hypoxia in the northern Adriatic Sea?
Provedor de dados: 5
Autores: Legovic, T; Justic, D.
Eutrophication of the northern Adriatic Sea was investigated using data on dissolved oxygen (DO) from 1911 to 1982. Beginning in the period 1955-1965, DO concentrations increased in the surface layer and decreased close to the bottom in all seasons except winter. These changes are attributed to an increase of the anthropogenic nutrient inflow. The occurrence of hypoxia near the bottom and its disappearance were investigated using the vertical distribution of DO on the transect from the Po delta to Rovinj during 1973. Horizontal distributions of DO close to the surface and near the bottom show prominent gradients from the Po delta towards the middle of the northern Adriatic Sea. Application of a simple box model indicates that phytoplankton blooms which...
Tipo: Text
Palavras-chave: Hypoxia; Phytoplankton blooms; Nutrients; Eutrophication; Adriatic Sea.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20451/18123.pdf

Rôle des macrophytes dans la restauration des milieux lagunaires : successions écologiques
Provedor de dados: 5
Autores: Le Fur, Ines.
The growing awareness of the negative impacts of the degradation of the water quality in coastal lagoons because of eutrophication has resulted in public action aiming at the reduction of the nutrient loadings into these lagoons. Hence, some of these coastal lagoons are currently undergoing ecological restoration and have shown a clear improvement of their water quality linked to decreasing phytoplankton biomass in the last 10 years. However, the response of the benthic macrophytes appears more complex, particularly by showing non-linear behaviour. By using complementary approaches including statistical analyses of long-term observations (1998-2015) and in situ measurements, this thesis aims to describe the dynamics of the macrophytes in space and time and...
Tipo: Text
Palavras-chave: Macrophytes; Eutrophisation; Lagunes méditerranéennes; Oligotrophisation; Restauration; Macrophytes; Eutrophication; Mediterrannean lagoons; Oligotrophication; Restoration.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00498/60959/64362.pdf

Nutrient and microbial dynamics in eutrophying shrimp ponds affected or unaffected by vibriosis
Provedor de dados: 5
Autores: Lemonnier, Hugues; Courties, Claude; Mugnier, Chantal; Torreton, Jean-pascal; Herbland, Alain.
A field survey was conducted on two intensive shrimp farms using similar technical practices: one (DF) historically affected by a vibriosis, the other (HC) in which the pathogen has been observed although no mortality event has occurred. Because historical data suggest that eutrophication process may directly or indirectly play a role in the disease outbreak, we focussed our research on its dynamics. A higher variability of the phytoplanktonic compartment linked to an imbalance in the molar N:P ratio was observed in farm DF compared to farm HC, implying a modification on the linkage between the bacteria and phytoplankton compartments at DF. The beginning of the mortality outbreak at DF followed a shift from picoto nanophytoplankton. The organic matter...
Tipo: Text
Palavras-chave: Aquaculture; Shrimp; Eutrophication; Ecosystem shift; Phytoplankton; Vibriosis.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00002/11368/8119.pdf

L'eutrophisation des eaux marines et saumâtres en Europe, en particulier en France
Provedor de dados: 5
Autores: Menesguen, Alain; Aminot, Alain; Belin, Catherine; Chapelle, Annie; Guillaud, Jean-francois; Joanny, Michel; Lefebvre, Alain; Merceron, Michel; Piriou, Jean-yves; Souchu, Philippe.
In order to be able to count the cases of coastal eutrophication and to propose methods to monitor as well as to reduce these phenomena, first of all it is necessary to precisely define the word eutrophication itself. Instead of the strict etymological definition, that is to say a progression of the enrichment of a medium, we will rather retain the concept of a state enriched at a point such as it causes harmful effects on the ecosystem, and nuisances to man's activities. Based on the average chemical equations of the organic matter synthesis/degradation in the sea, this operational definition thus puts forwards the harmful consequences of enrichment, i.e. the production of an excessive algal biomass, sometimes unbalanced from the point of view of...
Tipo: Text
Palavras-chave: Alexandrium; Phaeocystis; Monostroma; Ulva; Dilution plume; Water trapping; Anoxia; Nitrogen and phosphorus loadings; Red tides; Phytoplankton blooms; Green tides; Eutrophication; Alexandrium; Phaeocystis; Monostroma; Ulva; Panache de dilution; Confinement; Anoxie; Phosphate; Nitrate; Apports terrigènes; Eaux colorées; Blooms phytoplanctoniques; Marées vertes; Eutrophisation.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/rapport-22.pdf

Ability of taxonomic diversity indices to discriminate coastal lagoon environments based on macrophyte communities
Provedor de dados: 5
Autores: Mouillot, David; Gaillard, Sylvain; Aliaume, Catherine; Verlaque, Marc; Belsher, Thomas; Troussellier, Marc; Chi, Thang.
Lagoons are highly productive areas representing more than 50% of the coastline area in Languedoc-Roussillon (South of France, Mediterranean sea). These lagoons are very different in their environmental conditions, human influences, eutrophication levels and aquaculture intensity. Based on macrophyte communities associated with soft substrates, two indices of taxonomic diversity (the "average taxonomic distinctness" (Delta(+)) and the "variation in taxonomic distinctness" (Lambda(+))) were used to discriminate four of these lagoons (Thau, Salse-Leucate, Bages-Sigean and Mauguio). Bages-Sigean presented a significant higher average taxonomic distinctness (p &lt; 0.05) and Salse-Leucate had a significant higher variation in taxonomic distinctness (p &lt;...
Tipo: Text
Palavras-chave: Languedoc Roussillon; Exotic species; Human impact; Eutrophication; Biodiversity.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-748.pdf

In situ growth potential of the subtidal part of green tide forming Ulva spp. stocks
Provedor de dados: 5
Autores: Merceron, Michel; Antoine, Virginie; Auby, Isabelle; Morand, P.
Ulva spp., the algae most responsible for green tides in Brittany (France), are found on the foreshore and in the most beachward wave area (MBWA) of many bays during green tide phenomena. These algae have recently been seen drifting at greater depths (reaching -20 m). In view of the significant quantities of algae found at these depths, and the less favorable conditions for algal growth than in the intertidal zone, we attempted to determine if they could grow there. For that, during their maximum growth period (from May to July), algae were picked up at three stations located on the foreshore, in the MBWA and in the subtidal (deep) zones of the Bay of Douarnenez, and their nitrogen, carbon and chlorophyll a+b contents were determined, and their...
Tipo: Text
Palavras-chave: Nutrients; Irradiance; Photosynthesis; Ulva sp.; Algal blooms; Eutrophication.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3527.pdf

Dynamics of an estuarine ecosystem: Long-term trends in the macrobenthic communities of Chesapeake bay, (1985-1993)
Provedor de dados: 5
Autores: Dauer, Dm.
Long-term trends in subtidal macrobenthic communities of the lower Chesapeake Bay, USA, were examined using data collected quarterly (March, June, September and December) fr om 1985 through 1993 at 16 stations along a salinity gradient from tidal freshwater regions of the major tributaries (James, York and Rappahannock rivers) to the polyhaline region of the mainstem of Chesapeake Bay. In March 1989 two stations were added to the program in the mesohaline region of the Southern Branch of the Elizabeth River, a region characterized by contaminated sediments. A non-parametric trend analysis procedure was applied to five parameters characterizing macrobenthic community structure: community biomass, species richness, abundance of individuals, proportion of...
Tipo: Text
Palavras-chave: Chesapeake Bay; Benthos; Trends; Estuary; Eutrophication.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20399/18066.pdf

Rapport final projet Liteau II. Modélisation intégrée des transferts de nutriments depuis les bassins versants de la Seine, la Somme et l'Escaut jusqu'en Manche-Mer du Nord
Provedor de dados: 5
Autores: Lefebvre, Alain.
The main aim of the project was to produce quantitative assessment elements on past and future consequences of nutrient inputs from French and Belgian coastal rivers (Seine, Somme, Escaut) with regards to eutrophication status in the English Channel – North Sea. This project will reinforce implementation of the Water Framework Directive (2000/60/CE), in the context of the 2.1. axis (Definition of ecological status) from APR LITEAU II. This project implements and generalizes to the whole eastern English Channel and the southern bight of the North Sea the results from LITEAU I Programme which allowed the development of this application on the Seine watershed and the Baie de Seine estuary. The method consists in : (i) the simulating the Nitrogen, the...
Tipo: Text
Palavras-chave: OSPAR; WFD; Watershed – coastal zone continuum; Modelisation; Eutrophication; Southern bight of the North Sea; English Channel; OSPAR; DCE; Continuum bassin versant – zone côtière; Modélisation; Eutrophisation; Baie sud de la Mer du Nord; Manche.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/rapport-6298.pdf

Biogeochemical aspects of bottom anoxia in a Mediterranean lagoon (Thau, France)
Provedor de dados: 5
Autores: Souchu, Philippe; Gasc, Anne; Collos, Y; Vaquer, A; Tournier, Henri; Bibent, B; Deslous-paoli, Jean-marc.
Physical and chemical characteristics (temperature, salinity, dissolved oxygen), nutrients [dissolved inorganic nitrogen (DIN), soluble reactive phosphorus (SRP) and silicate], dissolved organic nitrogen (DON) and phosphorus and particulate matter [particulate organic carbon (POC) and nitrogen (PON) and chlorophyll a] were measured at a station located in the deepest part of the Thau lagoon (8.5 m), France, during a 10 d period of bottom anoxia in summer 1994. The upper 8 cm of sediment were also analyzed for ammonium (NH(4)(+)) and SRP concentrations in the porewater. The study period was characterized by mean wind speed under 4 m s(-1) which induced an increase of surface temperature from 18 to 29 degrees C with the formation of a thermocline. The...
Tipo: Text
Palavras-chave: Anoxia; Nitrogen; Phosphorus; Eutrophication; Thau lagoon; Mediterranean Sea.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00070/18142/15694.pdf

Inventaire des Ulves en Bretagne année 1998 - rapport de synthèse
Provedor de dados: 5
Autores: Merceron, Michel.
The 1998 survey of green tides on the Brittany coast was performed in the same way as that of 1997 in order to allow comparison. 11 includes an inventory ofail the concerned sites, and a precise assessment ofthirteen ofthem, the most loaded. On these ones, nitrogen fluxes were surveyed during the critical period, and the green seaweed stock on the beach and in the first waves was quantified. The climatic conditions were opposite between the two years, very dry in spring and summer 1997, and wet in 1998. The irradiance contrast was inverse, and less pronounced. The nitrate contents and mostly the flows were more important in 1998. They generated nitrogen fluxes about 3.3 times those of 1997. The total number of sites concerned in 1998 is clearly higher than...
Tipo: Text
Palavras-chave: Bretagne; Nitrate; Prolifération; Ulve; Eutrophisation; Brittany; Nitrate; Proliferation; Ulva; Eutrophication.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/rapport-2665.pdf

Caractéristiques du feutrage algal des récifs coralliens de Polynésie française soumis à différentes intensités de bioérosion
Provedor de dados: 5
Autores: Le Bris, S; Le Campion-alsumard, T; Romano, Jc.
This study deals with the colonisation of experimental Porites blocks by epilithic and endolithic algal community in two atoll lagoons and two high-island lagoons in French Polynesia, exposed to different environmental conditions during a 5-year period. A qualitative analysis of the community (cyanobacteria and micro-algae) was carried out, and the relationship between the epilithic and endolithic strata observed. HPLC analysis of chlorophyll pigments was used to quantitatively determine the plant biomass, which was then compared to that of the algal turf of neighbouring reefs. The results show that these blocks are colonised according to two factors: the reef structure (atoll or high-island) and the degree of human disturbance. The epilithic and...
Tipo: Text
Palavras-chave: Récif corallien; Feutrage algal épilithe et endolithe; Biomasse; Bioérosion; Eutrophisation; Coral reef; Epilithic and endolothic algal community biomass; Bioerosion; Eutrophication.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43652/43241.pdf

Détection satellitaire et modélisation opérationnelle de la production végétale non-fixée dans la bande côtière bretonne
Provedor de dados: 5
Autores: Penard, Cédric.
The negative impact of the man on the environment unquestionably increases. The coastal environment as a whole is the maritime environment which is the most exposed to man-made eutrophication. For instance, nitrate loads to coastal waters off Brittany (France) have increased 10 times (from 3 to s 30mg L-1NO3) during the four last decades. Eutrophication of this coastal zone is now a recurrent problem, more and more worrying. This eutrophication exhibits two main forms : " green tides ", which are caused by local proliferations and stranding of green macro-algae (particularly the Ulva species) in nitrogen-enriched areas ; phytoplanktonic blooms, which are responsible for coloured water events, toxic species can be present (Pseudo-Nitzschia, Alexandrium,...
Tipo: Text
Palavras-chave: Bande côtière bretonne; Modèle couplé hydrodynamique-biogéochimie; Nutriments; Chlorophyllea; Production primaire; Eutrophisation; Modèle opérationnel; Pseudo-Nitzschia; French Brittany coastal shelf; Hydrodynamical biogeochemical coupled model; Nutrients; Chlorophyll-a; Primary production; Eutrophication; Operational model; Pseudo-Nitzschia.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00015/12603/9481.pdf

Benthic foraminifera as bio-indicators of drill cutting disposal in tropical east Atlantic outer shelf environments
Provedor de dados: 5
Autores: Mojtahid, Meryem; Jorissen, Frans; Durrieu, Josiane; Galgani, Francois; Howa, Helene; Redois, Fabrice; Camps, Roger.
We present a study of benthic foraminiferal. faunas from the outer continental shelf off Congo (tropical West Africa), with the aim to determine the impact of the discharge of oily drill cuttings on the sea floor environment, to judge the regenerating capacity of the benthic ecosystem, and to investigate the possibility to develop an environmental monitoring method for open marine continental shelf environments, based on benthic foraminifera. We studied the spatial distribution and microhabitats of living and dead foraminiferal faunas, sampled in April 2003, 4 years after the end of disposal activities, in the upper 3 cm of the sediment at 9 stations (about 180 m depth) offshore Congo, that were subject to various degrees of pollution by oily cuttings from...
Tipo: Text
Palavras-chave: Oily cuttings; Opportunistic taxa; Drill mud; Bio indicator; Eutrophication; Outer shelf; Benthic foraminifera.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2170.pdf

Effects of fish farming on seagrass (Posidonia oceanica) in a Mediterranean bay: seagrass decline after organic loading cessation
Provedor de dados: 5
Autores: Delgado, O; Ruiz, J; Perez, M; Romero, J; Ballesteros, E.
The effects of fish farming on a seagrass (Posidonia oceanica) meadow at Fornells Bay, Minorca (Balearic Islands) were studied. Changes in plant and meadow features (e.g. shoot morphology, shoot density, biomass, rhizome growth, nutrient and soluble sugars concentrations...) in three stations along a transect from a disturbed (organic pollution due to fish cultures) to an undisturbed site were assessed. The fish culture had ceased in 1991; however, seagrass decline, already reported in a previous study for the period 1988-1990, was still taking place at the time of sampling (July 1994). Differences between stations were very clear; the station closest to the fish cages showed reduced shoot density, shoot size, underground biomass, sucrose concentration and...
Tipo: Text
Palavras-chave: Aquaculture; Phanérogame marine; Posidonia oceanica; Eutrophisation; Caractéristique du sédiment; Aquaculture; Seagrass; Posidonia oceanica; Eutrophication; Sediment characteristics.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43632/43250.pdf

EXpertise sur les stocks SEDimentaires en milieu lagunairE. Projet EXSEDE
Provedor de dados: 5
Autores: Ouisse, Vincent; Fiandrino, Annie; Giraud, Anais.
La dynamique de restauration des les milieux lagunaires vis-à-vis de l’eutrophisation reste lente et souvent limitée par l'azote et le phosphore contenus dans les sédiments qui alimentent la colonne d'eau et supporteraient largement la croissance de macro-algues. Le compartiment sédimentaire doit donc être considéré comme une « pression » dans ce contexte de restauration qu’il faut aujourd’hui quantifier au même titre que les autres pressions. De nouvelles grilles d’évaluation des risques liés aux charges sédimentaires ont ainsi été développées pour l’azote et le phosphore total. Basées sur les seuils définis dans le RSL, elles tiennent compte de la structure des sédiments et sont fondées sur la notion de « stocks mobilisables ». L’analyse temporelle des...
Tipo: Text
Palavras-chave: Lagune méditerranéenne; Stock sédimentaire; Eutrophisation Mediterranean lagoon; Internal loads; Eutrophication.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00642/75435/76260.pdf

Production primaire et activité bactérienne en eutrophisation expérimentale (lagune du Brusc - Automne 1977)
Provedor de dados: 5
Autores: Cahet, G.; Martin, Y.
An experimental eutrophication carried out with several technics on mediterranean sea water (Embiez) in autumn shows : - significant variations in the electro-chemical composi­tion of phytoplanktonic excretion; complex organic substances are excreted during two different periods, especially after the Skeletonema costatum bloom; - close relations between heterotrophy (l4C glucose test) and excretion of organic matter by photosyn­thetic organisms, glucids are always predominant; - the original heterotrophy from the 14c pyruvate test; which is obviously more selective than the 14c glucose test; - the existence of different periods of active ultraplankton.
Tipo: Text
Palavras-chave: Eutrophisation; Méditerranée; Embiez; Eutrophication; Mediterranean; Sea; Embiez.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41670/40879.pdf

Methode de cartographie quantitative des ulves "offshore"
Provedor de dados: 5
Autores: Merceron, Michel; Lunven, Michel.
Recent studies in the bays of Douarnenez and La Forêt-Fouesnant have proved that drifting stocks of « offshore » ulva exist between -2 and -20 meters depth. These stocks are nearly as important in weight as those located in the tidal zone, the only ones which are generally studied. It is likely that such « offshore » stocks also exist elsewhere in Brittany. The sampling method by discrete stations visited by divers, which has been used till now, is considered heavy and not precise enough. The new method involves a film camera set on a fish towed at a speed of a few knots. The fish is kept above the sea bottom at a chosen altitude controlled by a guiderope. The system is sturdy, autonomous, and can be easily transferred from one boat to another. The...
Tipo: Text
Palavras-chave: Brittany; Cartography; Imagery; Method; Offshore ulva; Eutrophication; Bretagne; Cartographie; Imagerie; Méthode; Ulve offshore; Eutrophisation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/rapport-1579.pdf

Pré-contrat de baie - Golfe du Morbihan - Identification, localisation et estimation des biomasses d'algues vertes du golfe du Morbihan en 1995.
Provedor de dados: 5
Autores: Ifremer, Del; Ceva, Pleubian.
In 1995, the gulf of Morbihan was not showing on the whole a pronounced level of eutrophication, but has nonetheless three sites of green algae proliferation: the Auray river estuary, the branches of the Vannes and Séné estuary, as well as the outlet of the Noyalo's estuary. Only these last two sectors show algal developments that are "abnormal" and that can be linked to a specific phenomenon of eutrophication (Ulva green tide in the Rosvellec-Séné sector, Monostroma green tide in the Saint Armel-Tascon sector). In the spring of 1995, the observations made on the foreshores of the Gulf of Morbihan, excluding the islands, made it possible to estimate an algal biomass of between 2,000 and 6,000 tons.
Tipo: Text
Palavras-chave: Morbihan gulf; Eutrophication; Green seaweed; Green algae; Eutrophisation; Golfe du Morbihan; Algues vertes.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/rapport-2085.pdf

Influence of Freshwater Discharges on Biogeochemistry and Benthic Communities of a Coral Reef Ecosystem (La Réunion Island, Indian Ocean)
Provedor de dados: 5
Autores: Tedetti, Marc; Bigot, Lionel; Turquet, Jean; Guigue, Catherine; Ferretto, Nicolas; Goutx, Madeleine; Cuet, Pascale.
We investigated the influence of freshwater discharges on biogeochemistry and benthic communities of La Saline fringing reef, the largest coral reef system of La Réunion Island (France, Indian Ocean). Sampling was conducted in February–March 2012 along a land-ocean continuum, including rivers, groundwater, reef waters, and oceanic waters. Our results indicated the discharges of basalt groundwater (enriched in nitrates) in the southern part of the reef, and the discharges of sand groundwater and river waters (enriched in organic matter) in sites located northward. These discharges mainly impacted fore reef surface waters, while groundwater resurgences were more diffuse and not clearly detected in depth. We highlighted the relationship Si(OH)4/NO3– to...
Tipo: Text
Palavras-chave: Coral reefs; La Reunion; Indian Ocean; Eutrophication; Groundwater; Nutrients; Organic matter; Fluorescence.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/77030/78316.pdf

Eutrophication modelling chain for improved management strategies to prevent algal blooms in the Bay of Seine
Provedor de dados: 5
Autores: Passy, Paul; Le Gendre, Romain; Garnier, Josette; Cugier, Philippe; Callens, Julie; Paris, Francois; Billen, Gilles; Riou, Philippe; Romero, Estela.
Eutrophication of the Seine estuary and the Bay of the Seine is a crucial environmental issue for the management of ecosystems and economic activities related to fisheries and tourism. A large quantity of nutrients, especially nitrogen, is brought to the coastal zone by the Seine River, the main input of that area, but also by smaller rivers along the Normandy coast. This large delivery of nitrogen leads to an imbalance between nitrogen (N), phosphorus (P) and silica (Si), which affects the growth of planktonic organisms and can exacerbate the occurrence of harmful algal blooms (HABs). These events can be damaging for shellfish fisheries, an important economic resource for the region. The study describes a new modelling chain coupling a riverine and a...
Tipo: Text
Palavras-chave: Eutrophication; Harmful algal blooms; Nutrient load; Modelling; Water quality; Seine.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00300/41103/41542.pdf

Changes in the annual harmful algal blooms of     Alexandrium minutum     : effects of environmental conditions and drainage basin inputs in the Rance estuary (Brittany, France)
Provedor de dados: 5
Autores: Le Bec, Claude; Legendre, Aurelie; Messiaen, Gregory.
Time series of physico-chemical data and concentrations (cell L-1) of the toxic dinoflagellate Alexandrium minutum collected in the Rance macrotidal estuary (Brittany, France) were analyzed to understand the physico-chemical processes of the estuary and their relation to changes in bloom development from 1996 to 2009. The construction of the tidal power plant in the north and the presence of a lock in the south have greatly altered hydrodynamics, blocking the zone of maximum turbidity upstream, in the narrowest part of the estuary. Alexandrium minutum occurs in the middle part of the estuary. Most physical and chemical parameters of the Rance estuary are similar to those observed elsewhere in Brittany with water temperatures between 15–18 °C, slightly...
Tipo: Text
Palavras-chave: Harmful algae; Dinoflagellate; Nutrients; Eutrophication; Drainage basin; Land runoff.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00341/45257/44698.pdf

Etude Sédimentaire Appliquée à l'Aquaculture pour Cinq Estrans de Bretagne Sud (Morbihan et Loire Atlantique).
Provedor de dados: 5
Autores: Lemoine, Gérard.
Within the national molluscan monitoring network, a sedimentary study was carried out on five experimental sites located in southern Brittany (i.e., from Etel to Pen-Bé rivers). The study aimed to specify sediment integrating characteristics with regards to hydrobiological variables. Moreover, interactions between sediment and water column characteristics were specified. It appears that this approach is likely unappropriate to characterize interdical rearing area productivity. However, this approach can support the site evaluation on a long term basis to sustain shellfish culture management. This would require additional study to assess sediment reactivity to abnormal events like drastic salinity decrease.
Tipo: Text
Palavras-chave: Sédiment; Ostréiculture; Estran; Phosphore; Eutrophisation; Sediment; Oyster culture; Intertidal area; Phosphorus; Eutrophication.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00102/21344/18967.pdf

Large-scale patterns of river inputs in southwestern Europe: seasonal and interannual variations and potential eutrophication effects at the coastal zone
Provedor de dados: 5
Autores: Romero, Estela; Garnier, Josette; Lassaletta, Luis; Billen, Gilles; Le Gendre, Romain; Riou, Philippe; Cugier, Philippe.
We provide data on nutrient export for 28 rivers in southwestern Europe and analyze long-term changes in the context of anthropogenic pressures and regulation policies. Special attention is given to seasonal variations, because the integrated annual values that are usually provided do not allow us to establish comparisons with seasonal phytoplankton dynamics. The eutrophication risk associated with river inputs is addressed by means of an indicator (Index of Coastal Eutrophication Potential, ICEP, Billen and Garnier, Mar Chem 106:148–160, 2007). An overview of the temporal evolution and the intra-annual variability of the ICEP is discussed for specific rivers and integrated coastal regions. The annual dynamics of the eutrophication indicator is analyzed to...
Tipo: Text
Palavras-chave: River inputs; Coastal zone; N:P:Si stoichiometry; Eutrophication; Seasonality; Europe.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00090/20152/17928.pdf

On the occurrence of ichthyoplankton in the Saronikos Gulf, Aegean Sea, 1. Anchovy and sardines in 1969-1970-1971.
Provedor de dados: 5
Autores: Yannopoulos, A; Yannopoulosa, C; Soteriades-vlahos, C.
The spawning and nursery grounds of 3 spp of commercial importance, Engraulis encrasicholus, Sardinella aurita and S. pilchardus were studied in the Saronikos Gulf during 1969, 1970 and 1971. The waters of the gulf are very rich due to turbulence caused by currents penetrating the gulf from the Aegean Sea. This turbulence causes bottom upwelling especially in the northern region which is shallower. At the height of their reproduction these fish represent 90-95 per cent of the entire ichthyoplankton, especially in the northern region. E. encrasicholus appears to be the most abundant sp with a maximum of 1099/m super(2) of surface waters (where the density of eggs = 536 and of larvae = 563). 232/m super(2) of surface water represents the maximum for S....
Tipo: Text
Palavras-chave: Aegean sea; Saronikos gulf; Hydrography; Eutrophication; Reproduction; Sardines species; Anchovy; Ecology; Ichthyoplankton.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-2160.pdf

Marées vertes en Bretagne : état actuel des connaissances
Provedor de dados: 5
Autores: Merceron, Michel.
On tens of sandy beaches of Brittany, a green seaweed (Ulva) blooms during spring and summer. In the sites where the proliferation is the most important, the total biomass amounted to 20 000 t of wet weight in 1997, at the time of maximum. These "green tides" occur every year in nearly the same locations. They have a very harmful impact on local tourism. In many communes, beached and rotting algae are collected and dumped (43 000 m 3 as a whole in 1997). The main development of biomass takes place between the surf zone and the bare sand.The outbreak requires three coexisting conditions : 1) a sandy beach gently sloping, 2) a weak residual current (i.e. once the tidal back and forth movement has been filtered), 3) a nitrogen loading, even moderate (ammonium...
Tipo: Text
Palavras-chave: Brittany; Eutrophication; Proliferation; Ulva; Marine algae; Bretagne; Eutrophisation; Prolifération; Ulves; Algues marines.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/acte-46.pdf

Modélisation sur vingt ans (1976-1995) de la production phytoplanctonique en baie de Seine
Provedor de dados: 5
Autores: Guillaud, Jean-francois; Menesguen, Alain.
This paper presents an ecological modelling of the Bay of Seine (Eastern Channel) over the last twenty years, chosen as a typical case of eutrophication in a river plume. In the physical sub-model, the Bay is divided into 42 boxes and water fluxes between them are calculated automatically using Ifremer's "Elise" software. A two-layer, vertical thermohaline model is then linked with the horizontal circulation scheme in order to take vertical stratification into account. The biological submodel deals with two chemical elements, nitrogen and silicon, and splits phytoplankton into diatoms and flagellates. Results from this ecological model point out the spatial concordance of highest phytoplanktonic concentrations with the river plume spreading in the bay....
Tipo: Text
Palavras-chave: Eutrophication; Flagellate; Diatom; Bay of Seine; Two layer model; Eutrophisation; Diatomée; Diatomée; Baie de Seine; Modèle bicouche.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-842.pdf

Dynamics of phytoplankton communities in eutrophying tropical shrimp ponds affected by vibriosis
Provedor de dados: 5
Autores: Lemonnier, Hugues; Lantoine, Francois; Courties, Claude; Guillebault, Delphine; Nezan, Elisabeth; Chomerat, Nicolas; Escoubeyrou, Karine; Galinie, Christian; Blockmans, Bernard; Laugier, Thierry.
Tropical shrimp aquaculture systems in New Caledonia regularly face major crises resulting from outbreaks of Vibrio infections. Ponds are highly dynamic and challenging environments and display a wide range of trophic conditions. In farms affected by vibriosis, phytoplankton biomass and composition are highly variable. These conditions may promote the development of harmful algae increasing shrimp susceptibility to bacterial infections. Phytoplankton compartment before and during mortality outbreaks was monitored at a shrimp farm that has been regularly and highly impacted by these diseases. Combining information from flow cytometry, microscopy, pigment and phylogenetic analysis, the presence of Picocyanobacteria, Prasinophyceae and Diatomophyceae were...
Tipo: Text
Palavras-chave: Tropical aquaculture pond; Litopenaeus stylirostris; Vibriosis; Eutrophication; Phytoplankton; Harmful algae.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00343/45411/44986.pdf

Précontrat de baie "golfe du Morbihan" Mesures de flux nutritifs et inventaire d'algues vertes en 1995
Provedor de dados: 5
Autores: Piriou, Jean-yves; Chapron, Victorien; Annezo, Jean-pierre.
The gulf of Morbihan, without manifesting any pronounced signs of eutrophication, has, in 1995, three sites of green algae proliferation: the Auray river estuary, the branches of the Vannes and Séné estuary, as well as the outlet of the Noyalo's estuary. They are also the three sectors of the gulf that receive the most nutrient salts, in particular, nitrogen, which is a determining factor in the development of nitrophilic green algae (Ménesguen and Piriou 1995). During spring the nitrogen seems to come as much from urban sources (Vannes, Auray) as from agricultural sources coming from the northern catchment areas of the gulf.
Tipo: Text
Palavras-chave: Morbihan gulf; Eutrophication; Nitrogen; Green seaweed; Green algae; Eutrophisation; Golfe du Morbihan; Azote; Algues vertes.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/rapport-2084.pdf

Relations milieu-ressources : impact de la conchyliculture sur un environnement lagunaire méditerranéen (Thau)
Provedor de dados: 5
Autores: Deslous-paoli, Jean-marc; Souchu, Philippe; Mazouni, N; Juge, Claude; Dagault, Francoise.
Shellfish farming leaves its mark on the environment in which it has developed, and the men who depend upon it. These changes have altogether balanced the lagoon cycle and have caused disastrous episodic events. Increased water c1arity caused by the uptake of particulate material by shellfish farming allows seagrass to grow in deeper areas of the lagoon (down to five metres). Shellfish farming nutrient transformations increase ecosystem productivity, even if the filtration pressure keeps phytoplankton biomass at a low leveI. Storage of phosphorus and nitrogen in animal tissue limits eutrophication in this ecosystem. Transfer of oysters from growout facilities increases animal and vegetal specific diversity. The presence of large amounts of shellfish allows...
Tipo: Text
Palavras-chave: Lagune; Conchyliculture; Biogéochimie; Benthos; Eutrophie; Lagoon; Shellfish farming; Biogeochemistry; Benthos; Eutrophication.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00039/15032/12365.pdf

Approche dynamique et intégrée de l’évaluation d’un socio-écosystème côtier. Application à la lagune de Thau, son état écologique et ses bouquets de services écosystémiques sur la période 1970-2018
Provedor de dados: 5
Autores: Derolez, Valerie.
The Thau lagoon is one of the largest Mediterranean coastal lagoons and it supports many uses such as shellfish farming and fishing, priority activities of the territory, and more recently recreational activities. Since the 1960s, the increase in anthropogenic inputs, linked to the sudden growth of the population, led to microbiological contaminations of shellfish and degraded status of the lagoon, with negative impacts at sanitary, ecological and socio‐economic levels. Since the 1970s, the considerable work carried out on the waste water system on the watershed has made it possible to restore the lagoon, which then began an oligotrophication trajectory, a process that has still few been studied in coastal environments. Subject to a variety of pressures...
Tipo: Text
Palavras-chave: Lagoon; Eutrophication; Oligotrophication; Ecological status; Ecosystem services; Socio‐ecosystem; Thau.; Lagune; Eutrophisation; Oligotrophisation; État écologique; Services écosystémiques; Socio‐écosystème; Thau.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00662/77364/78938.pdf

Apports d'origine agricole et qualité des eaux côtières
Provedor de dados: 5
Autores: Merceron, Michel.
This summary and orientation document concerning the impact of agricultural activities on the quality of coastal waters summarises the main pollution, with the exception of organic microcontaminants. The excess of nutritive contributions is considered to be the most significant problem.
Tipo: Text
Palavras-chave: Discharges; Salubrity; Eutrophication; Water quality; Débits; Salubrité; Eutrophisation; Qualité d'eau.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/rapport-2652.pdf

Modeling the Influence of Eutrophication and Redox Conditions on Mercury Cycling at the Sediment-Water Interface in the Berre Lagoon
Provedor de dados: 5
Autores: Pakhomova, Svetlana; Yakushev, Evgeniy; Protsenko, Elizaveta; Rigaud, Sylvain; Cossa, Daniel; Knoery, Joel; Couture, Raoul-marie; Radakovitch, Olivier; Yakubov, Shamil; Krzeminska, Dominika; Newton, Alice.
This study presents a specifically designed Mercury module in a coupled benthic-pelagic reactive-transport model - Bottom RedOx Model (BROM) that allows to study mercury (Hg) biogeochemistry under different conditions. This module considers the transformation of elemental mercury (Hg(0)), divalent mercury (Hg(II)) and methylmercury (MeHg). The behavior of mercury species in the model is interconnected with changes of oxygen, hydrogen sulfide, iron oxides, organic matter, and biota. We simulated the transformation and transport of Hg species in the water column and upper sediment layer under five different scenarios, combining various levels of oxygenation and trophic state in the Berre lagoon, a shallow eutrophic lagoon of the French Mediterranean coast...
Tipo: Text
Palavras-chave: Mercury; Methylmercury; Biogeochemical modeling; Anoxia; Eutrophication; Lagoon; BROM.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00454/56535/58239.pdf

Field investigations and multi-indicators for shallow water lagoon management: perspective for societal benefit
Provedor de dados: 5
Autores: Brehmer, Patrice; Thang Do Chi,; Laugier, Thierry; Galgani, Francois; Laloe, Francis; Darnaude, Audrey M.; Fiandrino, Annie; Mouillot, David.
1. Abiotic and biotic variables of coastal lagoons are highly heterogeneous in both space and time, and this heterogeneity complicates the assessment of their ecological status. These variables are essential to the monitoring and preservation of these fragile ecotones and the resources and services they sustain. 2. An integrative approach for evaluating the ecological status of coastal lagoons, based on field investigations of the key parameters driving their functioning and a set of selected ecological indicators matching lagoon management information needs for societal benefits, is investigated. Consistency in lagoon status evaluation from multiple and different variables was estimated, through a case study comparing three adjacent yet contrasting French...
Tipo: Text
Palavras-chave: Coastal lagoon; Ecological assessment; Ecotoxicology; Eutrophication; Indicator; Management; Mediterranean Sea; Observatory.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00056/16702/14202.pdf

Rôle des sédiments dans le cycle des nutriments et impacts sur l’eutrophisation des écosystèmes côtiers
Provedor de dados: 5
Autores: Ratmaya, Widya.
Eutrophication was studied in the coastal waters of Vilaine Bay (VB) in relation to that in the Loire and Vilaine rivers, by analyzing long-term trends of phytoplankton biomass and nutrient concentrations during the past decades. The reduction in dissolved riverine inorganic phosphorus concentrations (DIP) during the last two decades led to the significant decrease in chlorophyll a concentrations. However, dissolved inorganic nitrogen concentrations (DIN) decreased only slightly in the Vilaine and actually increased in the Loire, especially during summer. Simultaneously, phytoplankton in VB has undergone the following changes: 1) increase in biomass, 2) change in timing of the annual peak of biomass from spring to summer, 3) modification in seasonal course...
Tipo: Text
Palavras-chave: Eutrophisation; Cycle des nutriments; Régénération benthique; Nutriment limitant; Baie de Vilaine; Eutrophication; Nutrient cycling; Benthic regeneration; Nutrient limitation; Vilaine Bay.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00476/58799/61337.pdf

Trajectories of Changes in Phytoplankton Biomass, Phaeocystis globosa and Diatom (incl. Pseudo-nitzschia sp.) Abundances Related to Nutrient Pressures in the Eastern English Channel, Southern North Sea
Provedor de dados: 5
Autores: Lefebvre, Alain; Dezécache, Camille.
The phytoplankton compartment is particularly reactive to changes in nutrient concentration and is used as a quality indicator. Using a simple numerical approach, the response of emblematic harmful taxa from the eastern English Channel and southern North Sea to changes in nutrient inputs was studied. The method is based on a diachronic approach using averaged maxima over sliding periods of six years (1994–2018). This gave a final dataset containing pairs of points (number of years) for explained and explanatory variables. The temporal trajectory of the relationship between each pair of variables was then highlighted. Changes were represented as long-term trajectories that allowed a comparison to a reference/average situation. In addition, the relevance of...
Tipo: Text
Palavras-chave: Harmful algal blooms; Eutrophication; Trajectory; Phaeocystis globosa; Pseudo-nitzchiacomplex; Oslo and Paris Convention OSPAR; Water Framework Directive (WFD); Marine Strategy Framework Directive (MSFD).
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00632/74400/74103.pdf

Effet des conditions environnementales sur le développement des pathologies à Vibrio dans les élevages de crevettes en Nouvelle-Calédonie
Provedor de dados: 5
Autores: Lemonnier, Hugues.
Shrimp aquaculture in New Caledonia is a developing industry, exclusively based on the species Litopenaeus stylirostris. However, it is subject to mortalities during grow out as observed all over the world. Since 1993, shrimp reared during the cold period are affected by a disease named "syndrome 93". As a consequence, the whole industry has become seasonal and produces essentially during the warm season. The climatic conditions during the periods of transition between the two main seasons could be responsible for an environmental stress and the origin reason for mortality outbreaks. Stocking density is the main risk factor. It increases the probability of the appearance and development of the epizooty in the pond. The "Summer Syndrome", a septicemic...
Tipo: Text
Palavras-chave: New Caledonia; Risk factors; Environmental stress; Vibriosis; Epizooty; Pond management; Eutrophication; Pond health; Shrimp; Litopenaeus stylirostris; Peneids; Aquaculture; Nouvelle  Calédonie; Facteur de risque; Stress environnemental; Vibrioses; Pratiques d'élevage; Eutrophisation; Santé de l'écosystème bassin; Crevette; Litopenaeus stylirostris; Pénéides; Aquacultre.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-2643.pdf

Inventaire des ulves en Bretagne. Année 1997. Rapport de synthese
Provedor de dados: 5
Autores: Merceron, Michel.
The yearly study of Ulva in Brittany aims at building a time series of its proliferations and corresponding nutrient loadings. The goal is to detect results of wilful loading reductions, and to distinguish them from natural variations. This first actually quantified study is the starting bench-mark of the process. Forty-five concerned sites were listed in 1997. They are nearly the same as in 1988, 1991 and 1994 (previous rough census). The Côtes d'Armor and then the Finistère are the most affected departments. The Morbihan is less and file et Vilaine not at all. Ulva biomass was precisely quantified in about fifteen locations during the growing season, along with nitrogen loadings of local streams (mostly nitrate). The fluxes of nitrogen - the limiting...
Tipo: Text
Palavras-chave: Bretagne; Nitrate; Prolifération; Ulve; Eutrophisation; Brittany; Nitrate; Proliferation; Ulva; Eutrophication.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/rapport-1580.pdf

Évolution biologique de la lagune de Nador (Maroc) au cours de la période 1982-1993
Provedor de dados: 5
Autores: Lefebvre, A; Guelorget, O; Perthuisot, Jp; Dafir, Je.
The biogeological evolution of Nador lagoon over the 1982-1993 period was surveyed through water parameters, chlorophyll biomass, macrobenthos and surficial sediments. Comparison of present data with the 1982-83 ones (Guelorget et al., 1984) shows that: the general organization and functioning of the basin (water circulation, biological and sedimentological zonations) remain roughly the same, the global confinement as described by the biological zonation has slightly increased, with an extension of the high confinement zones (zones IV to VI) to the detriment of the low confinement zones, notably zones I and II, the main change has been eutrophication and a dramatic increase elf organic matter inputs and sedimentation, due to increasing urbanization and the...
Tipo: Text
Palavras-chave: Paralic; Confinement; Morocco; Present; Eutrophication.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20404/18071.pdf

Spatio-temporal dynamics of sedimentary phosphorus along two temperate eutrophic estuaries: A data-modelling approach
Provedor de dados: 5
Autores: Ait Ballagh, Fatima Ezzahra; Rabouille, Christophe; Andrieux Loyer, Francoise; Soetaert, Karline; Elkalay, Khalid; Khalil, Karima.
Sediments play an important role in dissolved inorganic phosphorus (DIP) recycling, which needs to be precisely quantified in eutrophic estuaries. A coupled field data and diagenetic modelling approach was used to study P dynamics in two estuaries (Elorn and Aulne, Brittany, France). An existing model (OMEXDIA) was extended with phosphorus (P) benthic cycle by adding dissolved inorganic phosphorus (DIP) and particulate P fractions (organic P, Fe-bound P and Ca-bound P). The model was fitted to pore water oxygen, nitrate, ammonium, oxygen demand units (reduced substances that were produced by the anoxic mineralization; Fe2+, Mn2+ and H2S; ODU), DIP, sediment organic P and C, Fe-bound P and Ca-bound P data from four seasons (February, May, July and October...
Tipo: Text
Palavras-chave: Phosphorus; Estuarine sediments; Eutrophication; Diagenetic modelling; Fe-bound P formation-release; Ca-bound P precipitation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00598/71041/73089.pdf

Réseau de Suivi Lagunaire du Languedoc-Roussillon. Bilan des résultats 2002
Provedor de dados: 5
Autores: Laugier, Thierry; Fiandrino, Annie; Souchu, Philippe; Benau, Laurent.
The numerous coastallagoons lining the Languedoc-Roussillon mediterranean coast undergone high anthropic pressure. The Lagoon Monitoring Network as a result of partnership between Ifremer, the Languedoc- Roussillon Regional Council and the Rhône Méditerranée Corse Water Agency, apply to provide yearly a diagnostic of the environmental quality of21lagoons. This network has two main goals: • The monitoring of the state of the lagoon with regards to eutrophication and sorne specifie survey in coordination with local managers. • Management support (model simulation, synthetic infonnation, scientific support) towards local managers. This annual report gathers results of the actions planned in 2002 within the Network : • For each lagoon excosystem, results of...
Tipo: Text
Palavras-chave: Lagunes littorales; Méditerranée; Eutrophisation; Diagnostic; Surveillance; Gestion; Coastal lagoon; Mediterranean; Eutrophication; Diagnostic; Monitoring; Management.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00419/53085/54046.pdf

Long-term changes and coastal eutrophication. Examples from the Aland Islands and the Archipelago Sea, northern Baltic Sea
Provedor de dados: 5
Autores: Bonsdorff, E; Blomqvist, Em; Mattila, J; Norkko, A.
The coastal and archipelago waters of the northern Baltic Sea are influenced by increasing eutrophication (significantly increasing temporal trends in nutrient availability). Increased nutrient levels and pelagic primary production have led to decreased transparency in the water body, increased plankton biomass, and increased amounts of filamentous algae. Large-scale and long-term (15-30 years) comparisons have shown that zoobenthic communities have changed significantly (altered species diversity, increased total abundance and increased biomass). The stress in the ecosystem is also illustrated at the population level (Macoma balthica). An increasing trend is shown for a near-shore fish community, where the increase in biomass has been linear over the past...
Tipo: Text
Palavras-chave: Baltic Sea; Eutrophication; Long-term changes; Nutrient; Zoobenthos.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20402/18069.pdf

Algal food processing by Stegastes nigricans, an herbivorous damselfish: differences between an undisturbed and a disturbed coral reef site (La Reunion, Indian Ocean)
Provedor de dados: 5
Autores: Lison De Loma, Thierry; Harmelin-vivien, Mireille; Naim, Odile; Fontaine, Marie France.
There has, as yet, been little study of nutrient disturbance and its consequences on the functional biology of primary consumers in coral reefs. The processing of epilithic algal communities by the damselfish Stegastes nigricans was investigated at La Reunion, at two sites of a fringing reef, oligotrophic for one and eutrophic for the other. Differences between sites were analyzed in quantifying organic matter, organic carbon, nitrogen, and organic 'nutrients' (carbohydrate, lipid and protein) in the algal food, the digestive contents and the faeces of S. nigricans. In the disturbed site, algal turfs and digestive contents presented significantly higher organic matter, organic carbon, nitrogen and organic nutrient values. Absorption efficiency of total...
Tipo: Text
Palavras-chave: Régime herbivore; Stegastes; Récif corallien; Eutrophisation; La Réunion; Herbivory; Stegastes; Coral reef; Eutrophication; La Reunion.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43376/42835.pdf

"Summer syndrome" in Litopenaeus stylirostris grow out ponds in New Caledonia: zootechnical and environmental factors
Provedor de dados: 5
Autores: Lemonnier, Hugues; Herbland, Alain; Salery, Lucas; Soulard, Benoit.
The "Summer Syndrome", a septicemic vibriosis caused by Vibrio nigripulchritudo, is responsible for one of the two main seasonal mortalities which affect shrimp aquaculture in New Caledonia. It was identified for the first time in December 1997 in an intensive shrimp farm (called farm DF) and has been enzootic ever since. The "Summer syndrome" affects shrimp during warm-season growout. Although the geographic area concerned is limited, it is a potential threat for the industry in that the disease could spread. Analysis of grow out data from 1991 to 2002 in this farm was carried out in order to characterize the disease and the environmental conditions in relation to mortality. Results of farm DF were compared to data from farms not affected by the disease...
Tipo: Text
Palavras-chave: Eutrophication; Pond management; Vibriosis; Shrimp culture ponds.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1868.pdf

Relation concentration-débit et évolution temporelle du nitrate dans 25 rivières de la région Bretagne (France)
Provedor de dados: 5
Autores: Guillaud, Jean-francois; Bouriel, Luc.
The study of the twenty-five largest rivers of Brittany showed that nitrate concentrations are positively correlated with river flow, in 90 % of the cases. The hydrogeological characteristics of the watersheds had an influence on these relationships. In this respect, river basins characterized by prevalent surficial water runoff exhibited higher correlation coefficients and lower lag times between river flow sequences and nitrate concentrations.  The multi-year trend in riverine nitrate concentrations indicated a fourfold increase over 30 years. Nevertheless, 80% of rivers exhibited a recent decrease in nitrate concentrations, independent of inter-annual river flow fluctuations. The highest annual rates of nitrate decrease corresponded to river basins for...
Tipo: Text
Palavras-chave: Eutrophication; River flow; Multiple regression analysis; Multi year trend; Nitrate; Brittany; Eutrophisation; Débit fluvial; Régression multiple; Évolution pluriannuelle; Nitrate; Bretagne.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2568.pdf

First Comprehensive Quantitative Multi-Parameter Assessment of the Eutrophication Status from Coastal to Marine French Waters in the English Channel, the Celtic Sea, the Bay of Biscay, and the Mediterranean Sea
Provedor de dados: 5
Autores: Lefebvre, Alain; Devreker, David.
The first quantitative and comprehensive assessment of the eutrophication status from coastal to offshore French waters was performed within the Marine Strategy Framework Directive (MSFD descriptor 5) for the English Channel, the southern bight of the North Sea, the Celtic Seas, the Bay of Biscay and the Western Mediterranean Sea. Based on a combination of different data sources (in situ, satellite, and modeling products), a fully-integrated dataset was generated over the period 2010–2016. Using the best available knowledge on the eutrophication process and definition, the assessment procedure was implemented considering nutrient pressures, and direct and indirect effects of excessive inputs. The different steps of the assessment were: (i) Establishment of...
Tipo: Text
Palavras-chave: Eutrophication; Assessment; Marine Strategy Framework Directive (MSFD); Water Framework Directive (WFD); Oslo and Paris Convention (OSPAR); English Channel; Celtic Seas; Bay of Biscay; Mediterranean Sea; Nutrients; Chlorophyll; Oxygen; Turbidity; Phytoplankton; Macro-algae.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75350/76083.pdf

Reducing marine eutrophication may require a paradigmatic change
Provedor de dados: 5
Autores: Desmit, X.; Thieu, V.; Billen, G.; Campuzano, F.; Duliere, V.; Garnier, J.; Lassaletta, L.; Menesguen, Alain; Neves, R.; Pinto, L.; Silvestre, M.; Sobrinho, J. L.; Lacroix, G.
Marine eutrophication in the North-East Atlantic (NEA) strongly relies on nutrient enrichment at the river outlets, which is linked to human activities and land use in the watersheds. The question is whether human society can reduce its nutrient emissions by changing land use without compromising food security. A new version of Riverstrahler model (pyNuts-Riverstrahler) was designed to estimate the point and diffuse nutrient emissions (N, P, Si) to the rivers depending on land use in the watersheds across a large domain (Western Europe agro-food systems, waste water treatment). The loads from the river model have been used as inputs to three marine ecological models (PCOMS, ECO-MARS3D, MIRO&amp;CO) covering together a large part of the NEA from the Iberian...
Tipo: Text
Palavras-chave: North-East Atlantic; Eutrophication; Model scenarios; Land-sea continuum; Land use; Pristine; Management support.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00438/55007/56426.pdf

Response of phytoplankton to organic enrichment and shrimp activity in tropical aquaculture ponds: a mesocosm study
Provedor de dados: 5
Autores: Lemonnier, Hugues; Hochard, Sebastien; Nakagawa, Kento; Courties, Claude; Rodier, Martine.
We conducted a mesocosm study to investigate the combined effect of organic enrichment and sediment resuspension by shrimp on phytoplankton communities in shrimp aquaculture ponds. Hence, the factorial design included two factors, i.e., (i) shrimp density with a concomitant increase of feed input resulting in organic enrichment and (ii) with/without access of shrimp to the sediments. Increasing feed input in the system raised the eutrophication state of the environment characterized by an increase in phytoplankton biomass. Bioturbation enhanced (i) mineralization of organic matter via the microbial loop, resulting in faster nutrient recycling, (ii) an increase of primary production, and (iii) buffering capacity against eutrophication consequences. The...
Tipo: Text
Palavras-chave: Aquaculture; Litopenaeus stylirostris; Phytoplankton communities; Eutrophication; Bioturbation.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00392/50364/51066.pdf

Impacts of high-nitrate freshwater inputs on macrotidal ecosystems. I. Seasonal evolution of nutrient limitation for the diatom-dominated phytoplankton of the Bay of Brest (France)
Provedor de dados: 5
Autores: Del Amo, Yolanda; Le Pape, Olivier; Treguer, Paul; Queguiner, Bernard; Menesguen, Alain; Aminot, Alain.
The chemical factors (inorganic nitrogen, phosphate, silicic acid) that potentially or actually control primary production were determined for the Bay of Brest, France, a macrotidal ecosystem submitted to high-nitrate-loaded freshwater inputs (winter nitrate freshwater concentrations &gt;700 mu M, Si:N molar ratio as low as 0.2, i.e. among the lowest ever published). Intensive data collection and observations were carried out from February 1993 to March 1994 to determine the variations of physical [salinity, temperature, photosynthetically active radiation (PAR), freshwater discharges] and chemical (oxygen and nutrients) parameters and their impacts on the phytoplankton cycle (fluorescence, pigments, primary production). With insufficient PAR the winter...
Tipo: Text
Palavras-chave: Coastal ecosystem; Phytoplankton dynamics; Macrotidal; Nutrient limitation; Silicon; Eutrophication.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00337/44782/44588.pdf

Suivi régional des nutriments sur le littoral Nord Pas de Calais / Picardie. Bilan de l'année 2005.
Provedor de dados: 5
Autores: Lefebvre, Alain; Bonte, Yohann.
The coastal zone of the Nord - Pas de Calais / Picardie showed dysfonctioning patterns of the ecosystem considered to be link to human activities along shores. This results in regular massive development of species, such as the phytoplanktonic seaweed, Phaeocytis sp. which life cycle was partiy linked to nutrients availability and consequently to anthropogenic inputs. As part of the evaluation of the influence of continental inputs on the marine environment (nitrates, phosphates, ... ) and on potential eutrophication processes, of the estimation of the efficiency of the sewage treatments plants in the possible elimination of dumpings and in order to establish a long-term survey to follow up the change in coastal waters quality, the regional nutrients...
Tipo: Text
Palavras-chave: Apports continentaux; Eutrophisation; Qualité des eaux littorales; Surveillance; Continental inputs; Eutrophication; Quality of coastal waters; Monitoring.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00102/21346/18969.pdf

Overview of eutrophication indicators to assess environmental status within the European Marine Strategy Framework Directive
Provedor de dados: 5
Autores: Ferreira, Joao G.; Andersen, Jesper H.; Borja, Angel; Bricker, Suzanne B.; Camp, Jordi; Da Silva, Margarida Cardoso; Garces, Esther; Heiskanen, Anna-stiina; Humborg, Christoph; Ignatiades, Lydia; Lancelot, Christiane; Menesguen, Alain; Tett, Paul; Hoepffner, Nicolas; Claussen, Ulrich.
In 2009, following approval of the European Marine Strategy Framework Directive (MSFD, 2008/56/EC), the European Commission (EC) created task groups to develop guidance for eleven quality descriptors that form the basis for evaluating ecosystem function. The objective was to provide European countries with practical guidelines for implementing the MSFD, and to produce a Commission Decision that encapsulated key points of the work in a legal framework. This paper presents a review of work carried out by the eutrophication task group, and reports our main findings to the scientific community. On the basis of an operational, management-oriented definition, we discuss the main methodologies that could be used for coastal and marine eutrophication assessment....
Tipo: Text
Palavras-chave: Eutrophication; Chlorophyll; Dissolved oxygen; Harmful algae; Marine; Coastal; Assessment methods; Europe; Marine Strategy Framework Directive; Water Framework Directive.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00039/15055/12609.pdf

Ocean acidification with (de)eutrophication will alter future phytoplankton growth and succession
Provedor de dados: 5
Autores: Flynn, Kevin J.; Clark, Darren R.; Mitra, Aditee; Fabian, Heiner; Hansen, Per J.; Glibert, Patricia M.; Wheeler, Glen L.; Stoecker, Diane K.; Blackford, Jerry C.; Brownlee, Colin.
Human activity causes ocean acidification (OA) though the dissolution of anthropogenically generated CO2 into seawater, and eutrophication through the addition of inorganic nutrients. Eutrophication increases the phytoplankton biomass that can be supported during a bloom, and the resultant uptake of dissolved inorganic carbon during photosynthesis increases water-column pH (bloom-induced basification). This increased pH can adversely affect plankton growth. With OA, basification commences at a lower pH. Using experimental analyses of the growth of three contrasting phytoplankton under different pH scenarios, coupled with mathematical models describing growth and death as functions of pH and nutrient status, we show how different conditions of pH modify the...
Tipo: Text
Palavras-chave: Ocean acidification; Eutrophication; Primary production; Plankton succession; Food security.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00286/39723/38196.pdf

Trajectoires d’évolution des communautés phytoplanctoniques au cours du processus de restauration écologique des milieux lagunaires méditerranéens
Provedor de dados: 5
Autores: Leruste, Amandine.
Located at the interface between marine and continental systems, coastal lagoons are among the most diverse and productive ecosystems. These semi-enclosed ecosystems are very vulnerable to nutrient enrichment. In the Languedoc-Roussillon region, anthropogenic pressures have profoundly damaged the coastal lagoons, especially those belonging to the Palavasian complex close to Montpellier. The latter lagoons have been affected by high nutrient loadings from the sewage treatment plant of the Montpellier agglomeration. This resulted in a trophic gradient among the eight lagoons in the complex, from mesotrophy to hypertrophy, with altered primary producer communities by favoring the predominance of the phytoplankton compartment.The phytoplankton responds very...
Tipo: Text
Palavras-chave: Phytoplancton; Biodiversité; Eutrophisation; Restauration; Résilience; Lagunes méditerranéennes; Phytoplankton; Biodiversity; Eutrophication; Restoration; Resilience; Mediterranean lagoons.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00498/60930/64324.pdf

Response of diatom and dinoflagellate lifeforms to reduced phosphorus loading: a case study in the Thau lagoon, France
Provedor de dados: 5
Autores: Gowen, R. J.; Collos, Y.; Tett, P.; Scherer, C.; Bec, B.; Abadie, Eric; Allen, M.; O'Brien, T.
The basin of Thau in southern France is a shallow, weakly flushed lagoon which is an important location for oyster cultivation. Phytoplankton analyses were carried out in 1975-1976 and then (almost) continuously since 1987. We report an investigation of 'the balance of organisms' in phytoplankton in relation to reductions in phosphorus loading, using two new tools based on phytoplankton lifeforms: the Plankton Index for Phytoplankton (PIp); Euclidean distance in state space. Our results show the utility of the tools for analysing changes in the ‘balance of organisms’ at the level of functional groups (in our study diatoms and dinoflagellates), but also illustrate the difficulties in demonstrating the reversal of human impacts resulting from eutrophication....
Tipo: Text
Palavras-chave: Eutrophication; Thau lagoon; Phosphorus; Lifeform; State-space; Euclidean distance.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00257/36817/35449.pdf

Dataset on marine ecosystem services supplied by coral reefs, sandy beaches and coastal lagoons in different eutrophication states
Provedor de dados: 5
Autores: Kermagoret, Charlene; Claudet, Joachim; Derolez, Valerie; Nugues, Maggy M.; Ouisse, Vincent; Quillien, Nolwenn; Bailly, Denis.
This data article provides indicators of Ecosystem Service (ES) supply for coral reefs, sandy beaches and coastal lagoons in different ecological states regarding eutrophication. 14 ES are considered: food through fisheries; material; molecules; coastal protection; nutrient regulation; pathogen regulation; climate regulation; support of recreational and leisure activities; contribution to a pleasant landscape; contribution to culture and territorial identity; emblematic biodiversity; habitat; trophic networks; recruitment. For each ecosystem 3 to 4 eutrophication states are described. Indicators of ES supply are filled on the basis of a literature review supplemented with expert-knowledge. A semi-quantification of the indicator value is finally provided....
Tipo: Text
Palavras-chave: Ecosystem services; Marine ecosystems; Eutrophication; Marine biodiversity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61145/64573.pdf

Distribution of picophytoplankton and nanophytoplankton along an anthropogenic eutrophication gradient in French Mediterranean coastal lagoons
Provedor de dados: 5
Autores: Bec, Beatrice; Collos, Yves; Souchu, Philippe; Vaquer, Andre; Lautier, Jacques; Fiandrino, Annie; Benau, Laurent; Orsoni, Valerie; Laugier, Thierry.
We explored the role of natural and anthropogenic environmental perturbations in shaping the community structure and dynamics of pico- and nanophytoplankton in coastal waters. The distribution patterns of phycoerythrin-rich picocyanobacteria (PE-CYAN) and phycocyanin-rich picocyanobacteria (PC-CYAN), autotrophic picoeukaryotes (PEUK) and nanophytoplankton (NANO) were examined over a period of 3 yr in 24 Mediterranean coastal lagoons displaying wide trophic gradients (from 0.2 to 630 mu g chlorophyll a [chl a] l(-1)) and salinity gradients (from fresh to marine waters). In summer, picoplanktonic abundances reached 3 x 10(8) cells l(-1), 5 x 10(9) cells l(-1) and 6 x 10(10) cells l(-1) for PE-CYAN, PC-CYAN and PEUK, respectively. PE-CYAN and PC-CYAN showed...
Tipo: Text
Palavras-chave: Autotrophic picoeukaryotes; Picocyanobacteria; Nanophytoplankton; Abundance; Biomass; Eutrophication; Mediterranean lagoons.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00031/14267/11547.pdf

Macroalgal population and sustainability
Provedor de dados: 5
Autores: Morand, Philippe; Merceron, Michel.
Algal blooms, often associated with eutrophication, are common in temperate regions in coastal lagoons and estuarine areas as well as in open seas. However, because of recent changes in water flows and sediment and nutrient loads in most rivers, eutrophication phenomena are now occurring in areas previously non affected. One of its most widespread and easily recognized effects in a coastal marine ecosystem is the excessive growths and drifts of macroalgae, to such a degree that the biomass becomes a significant problem.   The nutrients, notably from anthropogenic origin, constitute a significant factor in the appearance of the blooms in coastal waters. Besides a background originating from natural areas and precipitations, nutrients come from agriculture,...
Tipo: Text
Palavras-chave: Green tides; Macroalgae; Eutrophication; Nutrients; Black Sea.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-2131.pdf

Predicting the consequences of nutrient reduction on the eutrophication status of the North Sea
Provedor de dados: 5
Autores: Lenhart, Hermann-j.; Mills, David K.; Baretta-bekker, Hanneke; Van Leeuwen, Sonja M.; Van Der Molen, Johan; Baretta, Job W.; Blaas, Meinte; Desmit, Xavier; Kuehn, Wilfried; Lacroix, Genevieve; Los, Hans J.; Menesguen, Alain; Neves, Ramiro; Proctor, Roger; Ruardij, Piet; Skogen, Morten D.; Vanhoutte Brunier, Alice; Villars, Monique T.; Wakelin, Sarah L.
In this paper the results from a workshop of the OSPAR Intersessional Correspondence Group on Eutrophication Modelling (ICG-EMO) held in Lowestoft in 2007 are presented. The aim of the workshop was to compare the results of a number of North Sea ecosystem models under different reduction scenarios. In order to achieve comparability of model results the participants were requested to use a minimum spin-up time, common boundary conditions which were derived from a wider-domain model, and a set of common forcing data, with special emphasis on a complete coverage of river nutrient loads. Based on the OSPAR requirements river loads were derived, taking into account the reductions already achieved between 1985 and 2002 for each country. First, for the year 2002,...
Tipo: Text
Palavras-chave: Eutrophication; Ecosystem modeling; OSPAR Comprehensive Procedure; Eutrophication assessment; North Sea; River nutrient loads; Reduction scenarios.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00003/11391/8054.pdf

Temporal variability of benthic-pelagic coupling in shallow enclosed environment: A case study with eutrophying shrimp ponds
Provedor de dados: 5
Autores: Hochard, Sébastien; Royer, Florence; Hubert, Morgane; Lemonnier, Hugues.
The evolution of benthic pelagic coupling was followed in two semi-intensive shrimp ponds in New Caledonia, with a special emphasis on the role of microphytobenthos (MPB). Three distinct periods could be identified. During the first period, MPB activity led to relative decoupling between the water column and the sediment, both compartments being autotrophic with low nutrients exchanges. During the second period, the sediment operated at the edge of a functional switch between autotrophy and heterotrophy. The amplitude of nutrient fluxes depended of the pool considered (DIN, DIP) and showed light dark variation. In the last period, sediment switched to heterotrophy with the establishment of benthic-pelagic coupling concomitantly to a massive sediment...
Tipo: Text
Palavras-chave: Tropical aquaculture; Shrimp; Eutrophication; Benthic-pelagic coupling; Microphytobenthos; Bioturbation.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00485/59681/62754.pdf

Floraciones algales nocivas en la bahía de Santiago de Cuba
Provedor de dados: 20
Autores: Gómez, L.; Díaz, U.; Fernández, A.; Licea, Y.; Álvarez, I.
Santiago de Cuba bay is an ecosystem eutrophic and vulnerable to FANs events. This work preset the results of monitoring during three year in eight stations located in the less polluted area of the bay, leading to the determination of the possible seasonal distribution and FANs frequency. 117 Phytoplankton species were identifying, which belong to 5 divisions; 28% of these species are reported as potentially toxic and/ or noxious. This zone of the bay classifies as politrophic, heterogeneous and dynamics. It highlights the cysts presence, as well as the occurrence of unialgal "blooms" of Gymnodinium catenatum and Cochlodinium polykrikoides, indicating the presence in the ecosystem of favorable conditions to HABs occurrence with negative impact on the...
Tipo: Conference Material
Palavras-chave: Cysts; Eutrophication; Phytoplankton; Algal blooms; Cysts; Eutrophication; Phytoplankton; Algal blooms; Http://aims.fao.org/aos/agrovoc/c_34811; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_32367.
Ano: 2006
URL: http://hdl.handle.net/1834/2251

Efecto acumulativo de agentes estresantes múltiples sobre  los corales hermatípicos de la región noroccidental de Cuba
Provedor de dados: 20
Autores: González Díaz, S. P.
En las últimas décadas ha ocurrido un deterioro acelerado de los arrecifes de coral debido al  efecto sinérgico de impactos naturales y antrópicos. En consecuencia, el objetivo de la tesis  es evaluar los efectos acumulativos producidos por agentes estresantes múltiples y que  impactan de forma simultánea los corales hermatípicos. Para ello se estimaron indicadores  ecológicos en los niveles de comunidad y población. Los resultados obtenidos en esta  investigación evidencian cambios en la estructura de las comunidades de corales que se  asocian con el impacto antrópico directo existente a lo largo de la costa noroccidental de  Cuba y que disminuye en la dirección este-oeste. Los indicadores ecológicos referidos a las  tallas de los corales, muestran...
Tipo: Theses and Dissertations
Palavras-chave: Coral reefs; Agents; Sedimentation; Eutrophication.
Ano: 2010
URL: http://hdl.handle.net/1834/5385

Calidad ambiental y capacidad de autodepuración de la laguna costera El Doctor. Playa Baracoa, Habana, Cuba
Provedor de dados: 20
Autores: Perigó Arnaud, E.; Montalvo, J.F.; Miravet Regalado, M.E.; Enríquez Lavandera, D.; Cobas, L.S.; Ramírez Stout, O.; Rivas Rodríguez, L.; García, R.
Se presenta un diagnóstico sobre la calidad ambiental de la laguna costera El Doctor a partir de las principales variables físico químicas y microbiológicas indicadoras de la contaminación orgánica, su estado trófico e higiénico sanitario en tres campañas de muestreo realizadas en febrero de 2006 y mayo y octubre de 2007. La laguna presenta un alto grado de contaminación orgánica, altos valores de nutrientes, así como, elevadas concentraciones de coliformes totales y fecales, y estreptococos fecales, los cuales, sobrepasan los limites establecidos en las normas cubanas de calidad de agua para usos pesquero y recreativo (NC: 22-99 y NC: 25-99). La principal causa de la contaminación de la laguna son los residuales crudos que llegan a la laguna originados...
Tipo: Journal Contribution
Palavras-chave: Eutrophication; Coastal lagoons; Environmental assessment; Eutrophication; Coastal lagoons; Environmental assessment; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_37751.
Ano: 2010
URL: http://hdl.handle.net/1834/3668

Going against the flow: Effects of river damming in Cuban fisheries
Provedor de dados: 20
Autores: Baisre, J. A.; Arboleya, A.
Over the last decade eutrophication of freshwater artificial reservoirs in Cuba occurred in parallel to oligotrophication of estuarine and coastal waters. These two processes influenced both freshwater and marine fisheries. A dramatic shift in species composition in freshwater fisheries has occurred, from dominance by cichlids (tilapia) to dominance by cyprinids. The high fishery yield from some reservoirs, and shift in species composition, seems related to progressive eutrophication of reservoirs by nutrient subsidies from different anthropogenic activities; particular those related to the size of urban areas within their watersheds. On the other hand, marine landings of estuarine-dependent species declined more significantly than for other groups...
Tipo: Journal Contribution
Palavras-chave: Fisheries; Eutrophication; River.
Ano: 2006
URL: http://hdl.handle.net/1834/5110

Variación espacio-temporal y grado de eutrofia de sustancias  nutrientes en aguas de los Golfos de Ana Maria  y Guacanayabo, Cuba
Provedor de dados: 20
Autores: Betanzos Vega, A.; Garcés Rodríguez, Y.; Delgado Miranda, G.; Pis Ramírez, M. A.
A partir de nueve muestreos efectuados en meses lluviosos del 2009 en aguas de los golfos de Ana María y Guacanayabo, región suroriental de Cuba, se realizaron comparaciones (ANOVA) entre ambos golfos de concentración de  sustancias nutrientes y otras variables oceanográfcas, así como se estimó el grado de eutrofia y se confeccionaron  cartas de distribución horizontal del índice de eutrofización del nitrógeno total inorgánico y el fósforo inorgánico. Se  analizaron las variaciones de la concentración media de nutrimentos en tres periodos diferentes (1972-1973, 1988- 1991 y 2009). Entre ambos golfos, se encontró diferencia signifcativa (P &lt; 0.05) en la salinidad, el fósforo inorgá- nico y los silicatos. La distribución espacial del índice de...
Tipo: Journal Contribution
Palavras-chave: Nutrients (mineral); Eutrophication.
Ano: 2012
URL: http://hdl.handle.net/1834/5246

Diagnóstico ambiental de la zona marino costera de Baracoa. Impactos y respuestas
Provedor de dados: 20
Autores: Perigó Arnaud, E.; Alcaide Orpín, J.; Montalvo Estévez, J.F.; Izquierdo, M.; Rivas, L.; Cobas Gómez, S.
Se realizó un diagnóstico de los principales problemas ambientales de la zona marino costera situada en la playa de Baracoa, perteneciente al Municipio Bauta, provincia La Habana, determinándose que las principales presiones antropogénicas que han alterado la calidad del ambiente químico-físico de los ecosistemas costeros como la laguna El Doctor, los estuarios de los ríos Santa Ana y Baracoa, así como el litoral donde se ubican las playas Holliwood y Habana y se relacionan con los vertimientos de residuales de las actividades domésticas, comerciales, recreativas y docentes que han contaminado los ecosistemas con nutrientes, materia orgánica y microorganismos entéricos que han hecho estos ecosistemas inapropiados para su empleo en las actividades...
Tipo: Preprint
Palavras-chave: Management; Eutrophication; Pressure; Eutrophication; Management; Pressure; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_16086; Http://aims.fao.org/aos/agrovoc/c_6174.
Ano: 2010
URL: http://hdl.handle.net/1834/3598

Variaciones espaciales y temporales de las  enfermedades en dos arrecifes de la región occidental de  Cuba
Provedor de dados: 20
Autores: González Ontivero, O.
Para Cuba no se encontraron trabajos que hagan énfasis en las enfermedades lo que  sugiere que existe un registro muy limitado de información sobre el tema. Este estudio  analiza la incidencia de enfermedades en dos  zonas de arrecifes de Cuba. Una en la  costa Norte y otra en la costa Sur, incluida dentro de un Parque Nacional, además de por  sus valores naturales, porque  mantiene las condiciones prístinas, sin influencia de  desechos humanos.    En los arrecifes de Ciudad de La Habana, en la región Norte, se han realizado diversos  trabajos sobre la diversidad y la densidad de las asociaciones de esponjas, gorgonias,  corales y peces. Sus resultados hacen referencia a las variaciones espaciales y  temporales en los índices ecológicos en relación con...
Tipo: Theses and Dissertations
Palavras-chave: Coral reefs; Eutrophication; Oil; Ecosystem management.
Ano: 2006
URL: http://hdl.handle.net/1834/5518

eventualité d’un transfert du phytoplancton toxique des milieux portuaires du golfe de gabè vers les zones de production de coquillage
Provedor de dados: 20
Autores: Hamza, A.; Dammak-Zouari, H.; Bouain, A.
Il est connu que les ports soumis à un trafic maritime intense réceptionnent éventuellement les eaux de ballast des navires en provenance de diverses contrées océaniques. De part le monde, le transfert et l’invasion de plusieurs espèces nuisibles  via  le déversement des eaux de ballast et le fouling des coques des navires ont été amplement mis en cause ces derniers temps. Ces introductions peuvent causer de nombreux dégâts aux secteurs avoisinants et notamment dans les zones de production des coquillages surtout si les espèces introduites sont constituées de phytoplancton toxique. Au terme de  4 années de suivi de la qualité phytoplanctonique des milieux portuaires du golfe de Gabès, nous avons pu  inventorier certaines espèces toxiques pour la plupart...
Tipo: Journal Contribution
Palavras-chave: Ballast; Ecology; Ecosystems; Eutrophication; Phytoplankton; Pollution monitoring; Toxicity.
Ano: 2006
URL: http://hdl.handle.net/1834/4271

Caracterização da hidrodinâmica e do estado trófico da lagoa de Bilene, Sul de Moçambique
Provedor de dados: 20
Autores: André, E.
Foi observado um evento de afloramento de algas nocivas e morte maciça de peixes e interrupção temporária das actividades turísticas na lagoa de Bilene, Moçambique em 2007. O presente estudo pretende fazer uma caracterização da hidrodinâmica e do estado trófico desta lagoa e compreender processos que resultam em afloramentos de algas tóxicas. Entre Julho de 2010 e Agosto de 2011, foram realizados oito campanhas de colheitas de dados de CTD incluindo a concentração de oxigénio em água,cobrindo um ciclo anual. Os resultados revelaram que a Lagoa de Bilene contem duas sub-bacias, uma a sul, maior em extensão geográfica mas menos profunda, e uma bacia a norte, com menor extensão geográfica mas mais profunda. As massas de água tem uma caracterização típica com...
Tipo: Journal Contribution
Palavras-chave: Eutrophication; Fertilization (biological); Salinity; Oxygen; Temperature; Oxygen deficiency; Temperature.
Ano: 2012
URL: http://hdl.handle.net/1834/5143

Compuestos de nitrógeno y fósforo en las aguas superficiales de tres zonas de la plataforma marina cubana
Provedor de dados: 20
Autores: Montalvo, J.F.; Perigó Arnaud, E.; Martínez, M.; García, I.; Esponda, S.C.; Cesar, M.E.; García, R.; López, D.; García, N.; Blanco, M.
Entre los años 1990 y 1991 se estudió el Golfo de Guacanayabo, desde 1998 hasta 2003 se evaluó el Golfo de Batabanó y el Archipiélago Sabana Camagüey fue investigado en la etapa 2001-2005, con el objetivo de evaluar los contenidos de nitrógeno y fósforo en estas tres regiones de la plataforma marina cubana y establecer las relaciones existentes entre ambos nutrientes. Los golfos de Guacanayabo y Batabanó poseen un mayor potencial de nitrógeno y fósforo que el ecosistema costero Sabana-Camagüey, debido al menor desarrollo de la red fluvial en este ecosistema, aunque en las tres regiones las concentraciones de estos compuestos están bajo una acentuada influencia antropogénica. La relación nitrógeno total-fósforo total N.T./P.T., mostró una tendencia a...
Tipo: Journal Contribution
Palavras-chave: Eutrophication; Nitrogen; Phosphorus; Man-induced effects; Archipelagoes; Eutrophication; Nitrogen; Phosphorus; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804.
Ano: 2010
URL: http://hdl.handle.net/1834/3667

Etude de la résistance aux antibiotiques des bactéries isolées de "mytilus galloprovincialis.
Provedor de dados: 20
Autores: El Bour, M.; Bouamama, K.; El Abed, O.
L’étude des résistances vis-à-vis de différentes substances antibiotiques pour des espèces bactériennes (aérobies et anaérobies) isolées chez Mytilus galloprovincialis a été réalisée par la méthode standard de l’antibiogramme. Ainsi, 50 souches bactériennes aérobies et 20 souches anaérobies appartenant à plus de 25 espèces différentes ont été isolées et testées. Les résultats obtenus montrent des profils à plusieurs résistances vis-à-vis des différentes familles  d’antibiotiques testés. Les résultats obtenus révèlent des profils à 12 résistances différentes notamment chez l’espèce anaérobie (Propioni acnes). Aussi, chez l’espèce aérobie pré dominante ( Aeromonas hydrophila) nous avons mis en évidence au moins 6 antibiotypes différents. Ces résultats...
Tipo: Journal Contribution
Palavras-chave: Antibiotics; Bacterial diseases; Control resistance; Ecology; Eutrophication; Indicator species; Microbiological analysis; Bacteria; Mytilus galloprovincialis; Http://aims.fao.org/aos/agrovoc/c_765; Http://aims.fao.org/aos/agrovoc/c_31155.
Ano: 2006
URL: http://hdl.handle.net/1834/4266

Significations ecologiques de la variabilite des polychetes dans le golfe de Tunis
Provedor de dados: 20
Autores: Zaabi, S.; Afli, A.
The coastal areas, like the gulf of Tunis, are more and more affected by the increasing anthropic activities and nutriment inputs coming from the catchments area. The polychaeta populations show different reactions in front of such conditions and constitute an effective biological tool to detect the first signs of disturbance. In total, nine stations in the north-east of the gulf, were sampled by the Van Veen grab. In this study, the model of ecological groups and biotic index was used. It appears that the general state in the studied area is overall satisfactory, except for some ones where a situation of beginning of imbalance or of transition, seems taking place.
Tipo: Journal Contribution
Palavras-chave: Polychaeta; Ecological zonation; Ecosystem disturbance; Eutrophication; Indicator species; Pollution monitoring; Water quality; Ecological zonation; Eutrophication; Water quality; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2465; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_35790.
Ano: 2006
URL: http://hdl.handle.net/1834/4273

Preliminary Discussion on the Sea Water Quality Status in the 2008 Olympics Boat-sailing Field and Adjacent Area.
Provedor de dados: 20
Autores: Shi, Xiaoyong; Chen, Lili; Zhu, Chenjian; Wang, Xiulin.
A cruise of survey in the 2008 Olympics boat-sailing field and adjacent area was carried out on August 28th, 2003. Preliminarily analysis on the eutrophication status was made on the basis of the content of dissolved inorganic nitrogen (DIN), dissolved inorganic phosphate (PO4-P)，dissolved oxygen(DO) and chemical oxygen demand (COD) as well. The results indicated that in most of the survey area, water quality was in accordance with the 1st class National Seawater Standard except the average concentration of petroleum hydrocarbon which was beyond the 2nd class National Seawater Standard. The concentrations of PO4-P as well as DIN were mainly influenced by the runoff or drainage from lands, with a comparatively higher concentration in the coastal areas from...
Tipo: Journal Contribution
Palavras-chave: Eutrophication; Pollution; Mineral salts (nutrients).
Ano: 2007
URL: http://hdl.handle.net/1834/5866

Effects of physical mixing on the environment of satellite lakes and dams of lake Victoria, Kenya
Provedor de dados: 20
Autores: Guya, F.; Wakwabi, E.; Jembe, T.; Osumo, W.; Sitoki, L.; Ogutu, Z.
In the Lake Victoria (Kenya) catchment are found several small lakes and dams. The satellite lakes and dams are important aquifers and buffer zones for the lake. Besides the water bodies are important water sources both for livestock and domestic use. A study conducted in the water bodies between January 2003 and December 2004 showed that effects of eutrophication are wide spread in the lakes and dams. An investigation of primary productivity and effects of physical mixing and material transport was done. In Lake Sare, Lake Victoria waters are transported to the satellite lake during both day and night through Goye causeway that connects the two. The water bodies have higher rates of primary productivity than Lake Victoria. Spatial extent of oxygen...
Tipo: Proceedings Paper
Palavras-chave: Dams; Eutrophication; Water reservoirs; Inland waters; Water bodies; Eutrophication; Primary production; Lake basins; Water mixing; Artificial lakes; Oxygen depletion; Endemic species; Pollution effects; Eutrophication; Dams; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_2121.
Ano: 2006
URL: http://hdl.handle.net/1834/1494

Coralline Algae, Important Coral-reef Builders Threatened by Pollution
Provedor de dados: 20
Autores: Mohammed, S.M.; Björk, M.; Björklund, M.; Semesi, A.
The release of inorganic nutrients into the sea by domestic sewage is a major threat to many marine systems. This eutrophication affects coral-reef organisms indirectly by increased growth of microalgae, leading to increased sedimentation, decreased light availibility, rapid growth of opportunistic macroalgae, etc. In this paper, we report a decrease in the cover of important group of coral-reef builders, the coralline algae. This decrease might be caused by the outlets of sewage water from Zanzibar town. Laboratory and field experiments show that both the growth rate and the calcification of these organisms are negatively affected by high phosphate levels, but not by nitrate or ammonia.
Tipo: Journal Contribution
Palavras-chave: Sewage; Algae; Eutrophication; Coral reefs; Nutrients; Environmental degradation; Http://aims.fao.org/aos/agrovoc/c_5274; Http://aims.fao.org/aos/agrovoc/c_34821.
Ano: 1995
URL: http://hdl.handle.net/1834/302

Determinación comparativa de la producción primaria con las técnicas de 14C y O2 en aguas salobres con diferentes grados de Eutroficación
Provedor de dados: 20
Autores: Gocke, Klaus; Hernández-J., Carlos A.
Se estudió la producción primaría del fitoplancton comparando las técnicas de la fijación de 14CO2 y la liberación de O2 en la Bahía de Kiel (BK, mesotrófico), el Fiordo de Kiel (FK, eutrófico) y el Fiordo de Schlei (hipertrófico). Estos lugares salobres de la parte más occidental del Mar Báltico se distinguen marcadamente en su producción primaria (PP). En promedio y considerando solamente la profundidad de máxima PP, la producción del Schlei por unidad de volumen excedió 9 veces la del Fiordo de Kiel y más de 40 veces la de la Bahía de Kiel. Por unidad de área las diferencias fueron mucho menos pronunciadas, dado que la profundidad de compensación se encontró a los 0.8 m (BK: 5.5 m, FK: 5.2 m). De acuerdo con consideraciones teóricas se encontró que la...
Tipo: Journal Contribution
Palavras-chave: Eutrophication; Brackish water; Eutrophication; Brackish water; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_1049.
Ano: 1994
URL: http://hdl.handle.net/1834/3791

Concentraciones de nutrientes y eutrofización en arrecifes coralinos de los archipiélagos Los Canarreos y Sabana-Camagüey
Provedor de dados: 20
Autores: Montalvo, J.F.; Perigó, E.
Coral reefs are very sensitive to the increment in nitrogen concentrations and phosphorus, since these compounds propitiate the macroalgae growth, resulting in the degradation of coral reefs. With the purpose of assessing the degree of nutriphication of the coral reefs in Los Canarreos Archipelago, located in the periphery of the Gulf of Batabanó, and those located in the outer area of Sabana-Camagüey Archipelago (SCA), three samplings were executed in the reefs of Los Canarreos Archipelago (August 1999, March 2000 and August 2000). In SCA, samplings were done in May 2002 and August 2003. The parameters evaluated were nitrates + nitrite, ammonium, total nitrogen, inorganic phosphorus and total phosphorus. The nutrient contents in the reefs located in the...
Tipo: Proceedings Paper
Palavras-chave: Coral reefs; Eutrophication; Nutrients (mineral); Nitrogen; Phosphorus; Coral reefs; Eutrophication; Nitrogen; Phosphorus; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_5804.
Ano: 2006
URL: http://hdl.handle.net/1834/2084

Investigation on possible chemical pollution of the BouGhraa lagoon south of Tunisia by chemical wastes
Provedor de dados: 20
Autores: Farhat, F.; Ben Aoun, Z.; Chouba, L.; Hadj Ali, M. S.
La mer de BouGhrara, un milieu quasi-lagunaire de cinquante milles hectares environ, a contribué d’une manière remarquable à la production halieutique Tunisienne jusqu’au 1992  4.786 tonnes, année à partir de laquelle cette production n’a cessé de décroître (1.118 tonnes en 2002). Par ailleurs le premier projet industriel d’aquaculture marine y a également vu le jour, atteignant une production aquacole en cages flottantes de 252 tonnes en 1990. Malheureusement cette activité a cessé en 1995, après une dizaine d’années et la société  qui assurait cette production a cessé ses activités et les quelques cages ont été déplacées de la lagune vers le bassin du port de Zarzis à la recherche de conditions environnementales meilleures. Plusieurs raisons ont été...
Tipo: Journal Contribution
Palavras-chave: Chemical pollution; Depletion; Eutrophication; Lagoon fisheries; Organic matter; Pollution effects; Salinity; Temperature; Waste disposal; Acidity.
Ano: 2007
URL: http://hdl.handle.net/1834/4249

Alteraciones de indicadores biológicos de   Gambusia puncticulata (Poey, 1854) en sitios muy contaminados del río Almendares
Provedor de dados: 20
Autores: Cabrera Páez, Y.
Se realizó una investigación con el objetivo de evaluar las alteraciones de los  procesos biológicos en los peces que viven en sitios muy contaminados. Se  aplicó una metodología basada en los efectos acumulativos de agentes  estresantes múltiples a nivel de individuo en la especie  Gambusia  puncticulata (Poey, 1854).   Este estudio se efectuó en tres sitios del río  Almendares: El Rodeo, considerado como  sitio de referencia, y dos sitios  altamente contaminados, el Bosque de La Habana y el Puente 23.  Se  encontró un incremento en el largo y el peso de las hembras, y en el factor  de condición para ambos sexos en los sitios más impactados.  Este resultado  se atribuye a la mayor disponibilidad de alimento debido a la eutrofización. El  índice...
Tipo: Theses and Dissertations
Palavras-chave: Fishes; Biological contamination; Eutrophication.
Ano: 2007
URL: http://hdl.handle.net/1834/5516

Control de la calidad ambiental del ecosistema marino de la Bahía de Santiago de Cuba
Provedor de dados: 20
Autores: Regadera, R.; Gómez, Y.; García, E.; Gómez, L.
It is presented an analysis of several indicators of water quality in Santiago de Cuba bay and of the bacteriological state in five of its beaches. Samples were taken in surface and 8 m deep. A low transparency of the waters was detected, associated with high levels of ammonium, total phosphorus and chlorophyll. In surface the dissolved oxygen had high levels, but in 8 m there was anoxia in the most interior stations. The thermotolerant coliforms reached high concentrations in the stations of the central axis, but in the beahes, only El Níspero was not appropriate for direct contact, in accordance with the current cuban standard. By means of a principal components analysis it was determined that high ammonium and total phosphorus concentrations were...
Tipo: Preprint
Palavras-chave: Eutrophication; Nutrients (mineral); Pollution; Eutrophication; Pollution; Http://aims.fao.org/aos/agrovoc/c_2734; Http://aims.fao.org/aos/agrovoc/c_6077.
Ano: 2010
URL: http://hdl.handle.net/1834/3572

Het Schelde-estuarium als filter: een bioreactor van stofstromen
Provedor de dados: 27
Autores: Van Damme, S.; Meire, P.
The Scheldt estuary is exposed to large loads of carbon and nutrients. This leads to a eutrophication problem characterized by reduced oxygen concentrations and a huge efflux of CO&lt;sub&gt;2&lt;/sub&gt;. In the coastal waters a degradation of the foodchain is noted caused by excessive nutrient supply. The capacity of the estuary to polish the water is important but can not cope with the vast scale of the immissions. Restoration and development of tidal wetlands can contribute in several ways to restore the water quality. Increase of water treatment is expected to have positive ecological results. Nevertheless, restoration of the oxygen conditions might counteract some purifying processes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Estuaries; Eutrophication; Food chains; Nutrients (mineral); Water quality.
Ano: 2001
URL: http://www.vliz.be/imisdocs/publications/280697.pdf

Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil
Provedor de dados: 86
Autores: Bortolon,Leandro; Ernani,Paulo Roberto; Bortolon,Elisandra Solange Oliveira; Gianello,Clesio; Almeida,Rodrigo Gabriel Oliveira de; Welter,Samuel; Rogeri,Douglas Antônio.
Abstract The objective of this work was to assess the risk of phosphorus losses by runoff through an index based on the degree of P saturation (DPS), in cropland soils of Southern Brazil. Sixty-five highly representative cropland soils from the region were evaluated. Three labile P forms were measured (Mehlich-1, Mehlich-3, and ammonium oxalate), and four P sorption indexes were tested (phosphorus single sorption point and Fe+Al determined with the three extractors). Water-extractable P (WEP) was used as an index of P susceptibility to losses by surface runoff. The DPS was determined from the ratio between labile P and each sorption index. DPS values obtained from the ratio between Mehlich-1 P and the single P sorption point ranged from 1 to 25%, whereas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eutrophication; Runoff; Single P sorption point; Water quality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901088

EFFECTIVENESS OF DIQUAT, BOTH ISOLATED AND ASSOCIATED WITH COPPER SOURCES IN CONTROLLING THE Hydrilla verticillata SUBMERGED MACROPHYTES AND ANKISTRODESMUS Gracilis microphyte
Provedor de dados: 87
Autores: MALASPINA,I.C.; CRUZ,C; GARLICH,N; BIANCO,S; PITELLI,R.A.
ABSTRACT The goal of this study was to evaluate the effectiveness of diquat, both isolated and associated with copper sources (oxychloride and hydroxide) in controling the H. verticillata submerged macrophyte and the A. gracilis microalgae. For this purpose, 10.0 cm H. verticillata young branches and 300 mL of A. gracilis culture were used. The experiments were performed in laboratory and the tested diquat concentrations were: 0.1; 0.2; 0.4; 0.8; 1.2; and 1.8 mg L-1, either isolated or added with 1.0% copper oxychlorideand hydroxide, as well as a control sample. On day 3, 7, 11, 21 and 30 after application, phytotoxicity signs were evaluated and on day 60 after application, green and dry biomass production and plant length were measured. To obtain dry...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical control; Water plant; Eutrophication; Phytotoxicity; Chlorophyll a.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100212

Phosphorus-Based Application of Livestock Manure and the Law of Unintended Consequences
Provedor de dados: 31
Autores: Norwood,   F. Bailey; Chvosta,   Jan.
The application of manure phosphorus at rates above crop uptake has resulted in water pollution for some regions.  In response, new manure management standards will require some farms to match manure phosphorus applications rates with crop uptake.  For some regions, this will lead to more crop acres and a shift toward crops with greater nutrient uptake, both of which will increase nitrogen runoff.  The greater nitrogen runoff could offset the lower phosphorus runoff to result in greater water pollution.  This demonstrates the law of unintended consequences, which results when policy does not consider how economic agents respond to incentives.
Tipo: Journal Article
Palavras-chave: Best management practice; Eutrophication; Manure management; Nutrient runoff; Phosphorus standards; Pollution control; Water pollution; Environmental Economics and Policy; Production Economics; D6; Q1; Q2.
Ano: 2005
URL: http://purl.umn.edu/43715

Combining Supply and Demand Estimates for Ecosystem Services from Cropland
Provedor de dados: 31
Autores: Ma,   Shan; Swinton,   Scott M.; Lupi,   Frank.
Payment-for-Ecosystem-Services (PES) programs are gaining appeal as flexible approaches to inducing the voluntary provision of ecosystem services (ES). Farmers, who manage agricultural ecosystems, provide important nonmarket ecosystem services to the public by their choice of production inputs and management practices. Although there exist various PES programs in the United States and Europe, we are aware of none that was designed based on a comprehensive understanding of the underlying supply and demand of ecosystem services. Taking advantage of unique, coupled datasets of stated preferences, this paper combines a supply-side cost function of farmers’ willingness to adopt practices that provide increased ES with a demand-side social benefit function of...
Tipo: Conference Paper or Presentation
Palavras-chave: Payment-for-Ecosystem-Services (PES); Contingent valuation; Aggregate supply and demand; Cropland; Eutrophication; Greenhouse gas; Agricultural and Food Policy; Environmental Economics and Policy; Q11; Q51; Q57; Q58.
Ano: 2011
URL: http://purl.umn.edu/103501

Water recreation benefits from reduced eutrophication in Finnish surface waters
Provedor de dados: 31
Autores: Vesterinen,   Janne; Pouta,   Eija.
Eutrophication has been commonly acknowledged as a typical problem of the Baltic Sea, but it is also emerging in Finnish inland waters. As municipal sources of nutrients have been addressed by enhancing waste water treatment, the pressure has focused to agriculture along with the adoption of the EU- Water Framework Directive, which aims to improve surface water quality to “good ecological status” by 2015. The implementation of the directive will likely affect water recreation behavior and benefits. In this study we modeled water recreation participation and water quality econometrically using a hurdle model for three activities: swimming, fishing and boating. In addition, we estimated the consumer surplus for a water recreation day using a travel cost...
Tipo: Conference Paper or Presentation
Palavras-chave: Water recreation; Non-market valuation; Eutrophication; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/43848

(In)Efficient Management of Interacting  Environmental Bads
Provedor de dados: 31
Autores: Kuosmanen,   Timo; Laukkanen,   Marita.
Many environmental problems involve the transformation of multiple harmful substances into one or more damage agents much in the same way as a firm transforms inputs into outputs. Yet environmental management differs from a firm’s production in one important respect: while a firm seeks efficient input allocation to maximize profit, an environmental planner allocates abatement efforts to render the production of damage agents as inefficient as possible. We characterize a solution to the hmultiple pollutants problem and show that the optimal policy is often a corner solution, in which abatement is focused on a single pollutant. Corner solutions may arise even in well-behaved problems with concave production functions and convex damage and cost functions....
Tipo: Working or Discussion Paper
Palavras-chave: Climate change; Cost-benefit analysis; Eutrophication; Multiple pollutants; Optimal environmental policy; Pollution control; Environmental Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/54287

Aquatic Hyphomycetes in the Parque Estadual das Fontes do Ipiranga - PEFI, São Paulo, Brazil
Provedor de dados: 88
Autores: Schoenlein-Crusius,Iracema Helena; Moreira,Carolina Gasch; Bicudo,Denise De Campos.
In the State Park Parque Estadual das Fontes do Ipiranga - PEFI, located in the city of São Paulo, samples of submerged mixed leaf litter were collected monthly from 10 sites with different levels of eutrophication, from October 2003 to April 2005. Some abiotic factors, such as pH, temperature, conductivity and dissolved oxygen were simultaneously measured in 20 cm deep water at each site. The leaf litter samples were washed in laboratory, cut into 1 cm² pieces and incubated in Petri dishes containing distilled sterile water for five to seven days at 15 °C to 20 °C. Twenty-four aquatic Hyphomycete species were identified, with predominance of Anguillospora crassa Ingold, Lunulospora curvula Ingold, Tetrachaetum elegans Ingold and Camposporium pellucidum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Eutrophication; Fungal diversity; Ingoldian fungi.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000300003

Effect of nitrate and ammonium on the growth and protein concentration of Microcystis viridis Lemmermann (Cyanobacteria)
Provedor de dados: 88
Autores: Rückert,Gabriela Von; Giani,Alessandra.
Cyanobacteria are a very important group in aquatic systems, particularly in eutrophic waters. Therefore studies about their success in the environment are essential. Many hypotheses have tried to explain the dominance of Cyanobacteria, and several emphasized the importance of various nitrogen sources for the success of the group. In this study, we measured the effect of ammonium and nitrate on the growth and protein concentration of Microcystis viridis (Cyanobacteria). This species is well-known because bloom formation in eutrophic waters. The study was carried out, in experimental batch cultures, using the WC medium with different nitrogen sources: ammonium, nitrate, ammonium + nitrate (50% ammonium + 50% nitrate) and ammonium at different concentrations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium; Cyanobacteria; Eutrophication; Growth; Nitrate; Protein concentration.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000200011

Modeling temporal variations of Gracilaria Greville and Hypnea J.V. Lamouroux (Rhodophyta) assemblages on a midlittoral reef platform at Piedade Beach, Pernambuco State, Brazil
Provedor de dados: 88
Autores: Guimaraens,Mariana Alves de; Macedo,Silvio José de; Oliveira-Carvalho,Maria de Fátima de; Burgos,Douglas Correia; Pereira,Sonia Maria Barreto.
The diversity of algal banks composed of species out the genera Gracilaria Greville and Hypnea J.V. Lamouroux have been impacted by commercial exploitation and coastal eutrophication. The present study sought to construct dynamic models based on algal physiology to simulate seasonal variations in the biomasses of Gracilaria and Hypnea an intertidal reef at Piedade Beach in Jaboatão dos Guararapes, Pernambuco State, Brazil. Five 20 × 20 cm plots in a reef pool on a midlittoral reef platform were randomly sampled during April, June, August, October, and December/2009 and in January and March/2010. Water temperature, pH, irradiance, oxygen and salinity levels as well as the concentrations of ammonia, nitrate and phosphate were measured at the sampling site....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algal biomass; Eutrophication; Sandstone reefs; Trophic models.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000400010

SOIL PHOSPHORUS THRESHOLDS IN EVALUATING RISK OF ENVIRONMENTAL TRANSFER TO SURFACE WATERS IN SANTA CATARINA, BRAZIL
Provedor de dados: 90
Autores: Gatiboni,Luciano Colpo; Smyth,Thomas Jot; Schmitt,Djalma Eugenio; Cassol,Paulo Cezar; Oliveira,Clovisson Menotti Boeira de.
The State of Santa Catarina, Brazil, has agricultural and livestock activities, such as pig farming, that are responsible for adding large amounts of phosphorus (P) to soils. However, a method is required to evaluate the environmental risk of these high soil P levels. One possible method for evaluating the environmental risk of P fertilization, whether organic or mineral, is to establish threshold levels of soil available P, measured by Mehlich-1 extractions, below which there is not a high risk of P transfer from the soil to surface waters. However, the Mehlich-1 extractant is sensitive to soil clay content, and that factor should be considered when establishing such P-thresholds. The objective of this study was to determine P-thresholds using the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eutrophication; Swine manure; Environmental pollution.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401225

Phosphorus fractions in sandy soils of vineyards in southern Brazil
Provedor de dados: 90
Autores: Schmitt,Djalma Eugênio; Comin,Jucinei José; Gatiboni,Luciano Colpo; Tiecher,Tales; Lorensini,Felipe; Melo,George Wellington Bastos de; Girotto,Eduardo; Guardini,Renato; Heinzen,Janaína; Brunetto,Gustavo.
Phosphorus (P) applications to vineyards can cause P accumulation in the soil and maximize pollution risks. This study was carried out to quantify the accumulation of P fractions in sandy soils of vineyards in southern Brazil. Soil samples (layers 0-5, 6-10 and 11-20 cm) were collected from a native grassland area and two vineyards, after 14 years (vineyard 1) and 30 years (vineyard 2) of cultivation, in Santana do Livramento, southern Brazil, and subjected to chemical fractionation of P. Phosphorus application, especially to the 30-year-old vineyard 2, increased the inorganic P content down to a depth of 20 cm, mainly in the labile fractions extracted by anion-exchange resin and NaHCO3, in the moderately labile fraction extracted by 0.1 and 0.5 mol L-1...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphate fertilization; Eutrophication; Vineyards.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200018

LAYERED DOUBLE HYDROXIDES: NANOMATERIALS FOR APPLICATIONS IN AGRICULTURE
Provedor de dados: 90
Autores: Benício,Luíz Paulo Figueredo; Silva,Rejane Alvarenga; Lopes,Júnia Aparecida; Eulálio,Denise; Santos,Rodrigo Morais Menezes dos; Aquino,Leonardo Angelo de; Vergütz,Leonardus; Novais,Roberto Ferreira; Costa,Liovando Marciano da; Pinto,Frederico Garcia; Tronto,Jairo.
The current research aims to introduce Layered Double Hydroxides (LDH) as nanomaterials to be used in agriculture, with particular reference to its use as storage and slow release matrix of nutrients and agrochemicals for plant growing. Structural characteristics, main properties, synthesis methods and characterization of LDH were covered in this study. Moreover, some literature data have been reported to demonstrate their potential for storage and slow release of nitrate, phosphate, agrochemicals, besides as being used as adsorbent for the wastewater treatment. This research aims to expand, in near future, the investigation field on these materials, with application in agriculture, increasing the interface between chemistry and agronomy.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Layered compounds; Nutrient slow release; Eutrophication; Nutrient reuse.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100001

Phosphorus Forms in Sediments as Indicators of Anthropic Pressures in an Agricultural Catchment in Southern Brazil
Provedor de dados: 90
Autores: Tiecher,Tales; Schenato,Ricardo Bergamo; Santanna,Maria Alice; Caner,Laurent; Santos,Danilo Rheinheimer dos.
ABSTRACT Phosphorus (P) fractionation is a suitable procedure to ascertain P lability in sediments and is able to distinguish sources of P under different soil management practices in a catchment. Brazil is the second largest producer and the largest exporter of tobacco in the world. Inadequate management of cultivated areas exposes the soil to erosion processes, accelerating the transfer of sediment and P to water bodies, which leads to eutrophication. We evaluated the P forms in suspended sediments collected at two rainfall events in the stream of a small catchment in the state of Rio Grande do Sul. The samples were collected upstream and downstream areas in three sub-catchments with different degrees of anthropogenic pressure and in three phases of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phosphorus fractionation; Watershed; Nonpoint source pollution; Eutrophication; Land use.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100431

Mobility of inorganic and organic phosphorus forms under different levels of phosphate and poultry litter fertilization in soils
Provedor de dados: 90
Autores: Gebrim,Fabrício de Oliveira; Novais,Roberto Ferreira; Silva,Ivo Ribeiro da; Schulthais,Fernanda; Vergütz,Leonardus; Procópio,Lorena Costa; Moreira,Frederico Fonseca; Jesus,Guilherme Luiz de.
The eutrophication of aquifers is strongly linked to the mobility of P in soils. Although P mobility was considered irrelevant in a more distant past, more recent studies have shown that P, both in organic (Po) and inorganic forms (Pi), can be lost by leaching and eluviation through the soil profile, particularly in less weathered and/or sandier soils with low P adsorption capacity. The purpose of this study was to determine losses of P forms by leaching and eluviation from soil columns. Each column consisted of five PVC rings (diameter 5 cm, height 10 cm), filled with two soil types: a clayey Red-Yellow Latosol and a sandy loam Red-Yellow Latosol, which were exposed to water percolation. The soils were previously treated with four P rates (as KH2PO4 ) to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eutrophication; Environmental critical level; Mehlich-1; Olsen.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000400019

Initial growth of Brachiaria subquadripara (Trin.) Hitchc. plants under different nutritional conditions
Provedor de dados: 91
Autores: Domingos,Vanessa D.; Martins,Dagoberto; Costa,Neumarcio V.; Costa,Andreia C. P. R. da; Marchi,Sidnei R. de.
ABSTRACT The objective of this study was to evaluate the initial growth of emergent plants of Brachiaria subquadripara under different conditions of availability levels of the nutrients nitrogen (N), phosphorus (P), and potassium (K) provided to the plants via nutrient solution in a greenhouse. The treatments consisted of five concentrations of N (0, 42.0, 84.0, 126.0, and 168.0 mg L-1), five concentrations of P (0, 6.2, 12.4, 18.6, and 24.8 mg L-1) and five concentrations of K (0, 46.8, 93.6, 140.4, and 187.2 mg L-1) which were adapted from a base solution. The results showed that the initial growth of plants was slow up to 21 days after transplantation (DAT) and it increased in accordance with increments in N, P, and K concentrations in the nutrient...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Urochloa subquadripara; Urochloa arrecta; Aquatic plant; Weed; Eutrophication; Water reservoir.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000600560

Ambiance rose production and nutrient supply in soil irrigated with treated sewage
Provedor de dados: 91
Autores: Gabrielli,Giuliano; Paixão,Jorge L. da; Coraucci,Bruno; Tonetti,Adriano L.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater reuse; Post-treatment; Eutrophication.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000800755

Size-mass relationships of Melanoides tuberculatus (Thiaridae: Gastropoda) in a eutrophic reservoir
Provedor de dados: 103
Autores: Silva,Eduardo Carvalho; Molozzi,Joseline; Callisto,Marcos.
This study evaluated the relationships of certain allometric measurements in Melanoides tuberculatus Muller, 1774, in order to develop a statistical model to estimate the biomass of this mollusc species. We measured the total length and aperture of 70 shells. These measurements were correlated with the biomass values to construct exponential and power-function models, and both models showed high coefficients of determination. The exponential model was the better biomass predictor, with a coefficient of determination over 93%. These proposed models may be an effective tool to determine the biomass of M. tuberculatus in eutrophic Brazilian reservoirs.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Dry mass; Eutrophication; Molluscs.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000500004

Trophic parameters and method validation in Lake Riñihue (North Patagonia: Chile) from 1978 through 1997
Provedor de dados: 97
Autores: WOELFL,STEFAN; VILLALOBOS,LORENA; PARRA,ÓSCAR.
Lake Riñihue is the last in a chain of glacially derived oligotrophic lakes in southern Chile and was the subject of limnological research by Dr. Hugo Campos and co-workers at the Universidad Austral de Chile, Valdivia, Chile, since the 1970's. Prof. Campos died in the field in 1998, and this paper now presents a review of these data with comments on methodology relevant to trophic parameters of this lake. Data are presented on inorganic nutrients, chlorophyll a, phytoplankton biomass, primary production and Secchi depth obtained over a period of 21 years between 1978 and 1997 in order to evaluate potential changes in these parameters over time. Non-parametric Wilcoxon rank sum tests were applied to determine temporal trends and revealed: (1) total...
Tipo: Journal article
Palavras-chave: Eutrophication; North Patagonian lake; Nutrients; Trophy; Analytical methods.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2003000300010

Occurrence of toxic blooms of Microcystis aeruginosa in a central Chilean (36° Lat. S) urban lake
Provedor de dados: 97
Autores: Almanza,Viviana; Parra,Oscar; Bicudo,Carlos E. De M.; Baeza,Carolina; Beltran,Johana; Figueroa,Ricardo; Urrutia,Roberto.
BACKGROUND: During the last decades the frequency and global distribution of toxic cyanobacteria blooms has increased globally, which has been attributed to the eutrophication and climate change. In Chile there have been reports on blooms in aquatic ecosystem in localities with high density population and on the presence of five congeners of microcystins but only two documented toxics blooms with hundreds fish kills. We investigated the presence of toxic cyanobacteria blooms in the Lo Galindo urban lake, Concepción city, and the environmental factors that influence the abundance of cyanobacteria and microcystins concentration. Lo Galindo Lake, is used for various recreational and eventually as a drinking water source RESULTS: Toxic blooms of Microcystis...
Tipo: Journal article
Palavras-chave: Microcystin; Microcystis aeruginosa; Scums blooms; Dispersive blooms; Eutrophication; Urban lake; Chile.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100008

Managing agricultural phosphorus to minimize water quality impacts
Provedor de dados: 63
Autores: Sharpley,Andrew.
ABSTRACT Eutrophication of surface waters remains a major use-impairment in many countries, which, in fresh waters, is accelerated by phosphorus (P) inputs from both point (e.g., municipal waste water treatment plants) and nonpoint sources (e.g., urban and agricultural runoff). As point sources tend to be easier to identify and control, greater attention has recently focused on reducing nonpoint sources of P. In Brazil, agricultural productivity has increased tremendously over the last decade as a consequence, to a large extent, of increases in the use of fertilizer and improved land management. For instance, adoption of the “4R” approach (i.e., right rate, right time, right source, and right placement of P) to fertilizer management can decrease P runoff....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertilizer management; Conservation practices; Runoff; Erosion; Eutrophication.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100001

Animal-based agriculture, phosphorus management and water quality in Brazil: options for the future
Provedor de dados: 63
Autores: Shigaki,Francirose; Sharpley,Andrew; Prochnow,Luís Ignácio.
Eutrophication has become a major threat to water quality in the U.S., Europe, and Australasia. In most cases, freshwater eutrophication is accelerated by increased inputs of phosphorus (P), of which agricultural runoff is now a major contributor, due to intensification of crop and animal production systems since the early 1990s'. Once little information is available on the impacts of Brazilian agriculture in water quality, recent changes in crop and animal production systems in Brazil were evaluated in the context of probable implications of the fate of P in agriculture. Between 1993 and 2003, there was 33% increase in the number of housed animals (i.e., beef, dairy cows, swine, and poultry), most in the South Region (i.e., Paraná, Rio Grande do Sul, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffuse pollution; Eutrophication; Poultry production; Swine production; Surface runoff.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200013

Phosphorus loss by surface runoff in no-till system under mineral and organic fertilization
Provedor de dados: 63
Autores: Bertol,Oromar João; Rizzi,Nivaldo Eduardo; Favaretto,Nerilde; Lana,Maria do Carmo.
The no-till system has been intensively used in the state of Paraná, Brazil, and it has increased the nutrients level at the soil surface. This has contributed for nutrient losses via runoff and consequently, off-site water pollution. The objective of this study was to evaluate phosphorus loss in surface runoff by simulated rainfall on an Oxisol, under no-till system following application of mineral fertilizer and liquid swine manure. Nitrogen, soil and water losses from the same study are reported in a separated paper. The application of liquid swine manure, compared with mineral fertilization, increased runoff concentration of total P, particulate P and dissolved reactive P by 193%, 111% and 506%, respectively, averaged for all rainfall intensities....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liquid swine manure; Water quality; Eutrophication; Soil erosion; Conservation tillage.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000100010

POTENTIALLY HARMFUL CYANOBACTERIA IN OYSTER BANKS OF TÉRMINOS LAGOON, SOUTHEASTERN GULF OF MEXICO
Provedor de dados: 37
Autores: POOT-DELGADO,Carlos Antonio; OKOLODKOV,Yuri B.; AKÉ-CASTILLO,José Antolin; RENDÓN von OSTEN.,Jaime.
ABSTRACT Cyanobacteria inhabit hypersaline, marine and freshwater environments. Some toxic and non-toxic species can form harmful blooms. The aim of this study was to identify potentially harmful cyanobacterial species in the oyster banks of Términos Lagoon, the southeastern Gulf of Mexico. Six sample sites (up to 2-m depth) were monitored monthly from August 2012 to September 2013. Water temperature, salinity, pH, dissolved oxygen saturation (% DO), inorganic nutrients and abundance of cyanobacteria were determined. Temperature and salinity were characterized by marked seasonal differences (26.8 to 30.6 °C and 6.1 to 19.5, respectively). The pH values (ranging from 7.1 to 8.4) and the % DO (88.4 to 118.2 %) suggest a predominance of photosynthetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annual cycle; Cyanobacteria; Eutrophication; Gulf of Mexico; Harmful algal blooms.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2018000100051

Temporal variation of the phytoplankton community at short sampling intervals in the Mundaú reservoir, Northeastern Brazil
Provedor de dados: 39
Autores: Dantas,Ênio Wocyli; Moura,Ariadne do Nascimento; Bittencourt-Oliveira,Maria do Carmo; Arruda Neto,João Dias de Toledo; Cavalcanti,Airlton de Deus C.
The aim of this study was to determine how abiotic factors drive the phytoplankton community in a water supply reservoir within short sampling intervals. Samples were collected at the subsurface (0.1 m) and bottom of limnetic (8 m) and littoral (2 m) zones in both the dry and rainy seasons. The following abiotic variables were analyzed: water temperature, dissolved oxygen, electrical conductivity, total dissolved solids, turbidity, pH, total nitrogen, nitrite, nitrate, total phosphorus, total dissolved phosphorus and orthophosphate. Phytoplankton biomass was determined from biovolume values. The role abiotic variables play in the dynamics of phytoplankton species was determined by means of Canonical Correspondence Analysis. Algae biomass ranged from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cylindrospermopsis raciborskii; Eutrophication; Nutrients; Water supply reservoir.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062008000400008

Effects of ocean warming, eutrophication and salinity variations on the growth of habitat-forming macroalgae in estuarine environments
Provedor de dados: 39
Autores: Borburema,Henrique Douglas dos Santos; Lima,Ruth Pessoa de; Miranda,George Emmanuel Cavalcanti de.
ABSTRACT Global change and coastal eutrophication are affecting macroalgae worldwide. We analyzed the effects of increased water temperature (25, 28 and 32 °C) and eutrophication on the growth of Bostrychia binderi and Bostrychia montagnei in a range of salinities (18, 24, 30, 36 and 42 PSU) through three independent multifactorial experiments. Both species had higher growth at 25 °C than at 28 and 32 °C (warming scenario projected by IPCC), suggesting a negative effect of ocean warming. The species showed a broad tolerance to the range of salinities tested, with higher growth at 36 and 42 PSU, as a local adaptation strategy. Oligotrophic seawater significantly affected the growth of both species because the lowest growth was found in this condition,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bostrychia; Bostrychietum; Climate change; Ecophysiology; Estuarine macroalgae; Eutrophication; Global change; Growth; Salinity variation; Sea level rise.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400662

Preliminary analysis on the use of Trophic State Indexes in a brazilian semiarid reservoir
Provedor de dados: 3
Autores: Lima, Paulo de Freitas; Sousa, Mart Som Reis; Porfírio, André Ferreira; Almeida, Beatriz Soares; Freire, Rogério Herlon Furtado; Santaella, Sandra Tédde.
The Carlson’s (1977) Trophic State Index (TSI) is a widely employed tool to estimate the degree of eutrophication in a reservoir. In Brazil, the need of a classification system that would take into account regional characteristics employed adjusted indexes generated by data from reservoirs in the southeastern region of the country. Current research compares responses for Carlson’s TSI (1977) and its derivations for Brazilian reservoirs from data collected in the Pereira de Miranda Reservoir (State of Ceará, Brazil), and analyzes the influence of local conditions on results and their applicability to reservoirs in the semiarid region. TSIs were calculated by data on total phosphorus, chlorophyll a and water transparency. The reservoir was estimated as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências biológicas; Ecologia (2.05.00.00-9) hydro-climatic conditions; Eutrophication; Limiting nutrient; Phosphorus; Nitrogen; Chlorophyll a Ecologia de ecossistemas (2.05.02.00-1).
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/27160

Ecotoxicity assessment in aquaculture system using the test organism Pseudokirchneriella subcapitata (Chlorophyceae) - doi: 10.4025/actascibiolsci.v34i4.9391
Provedor de dados: 3
Autores: Miashiro, Luciana; Instituto de Pesca; Lombardi, Julio Vicente; Instituto de Pesca; Mercante, Cacilda Thais Janson; Instituto de Pesca.
The purpose of this study is to perform toxicity tests with microalgae Pseudokirchneriella subcapitata (Chlorophyceae) using inland water samples to evaluate the impact caused by aquaculture. Six field samples were collected ranged November 2006 to March 2007, at Experimental Station, Pindamonhangaba, State of São Paulo. Abiotic factors pointed out to the mesotrophic and eutrophic characteristics already observed at the fish pond and its effluent. The results of ecotoxicological tests carried out with the microalgae Pseudokirchneriella subcapitata showed that the fish pond effluent was potential enough to stimulate the algal growth, therefore eutrophication, to the extent that it is naturally diluted to at least 12.5% of its initial concentration. This...
Palavras-chave: 2.10.07.00-4 Nile tilapia; Effluent; Eutrophication; Microalgae Toxicologia.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/9391

Modelling the impact of sediment management on the trophic state of a tropical reservoir with high water storage variations
Provedor de dados: 42
Autores: LIRA,CAMILA C.S; MEDEIROS,PEDRO H.A.; NETO,IRAN E. LIMA.
Abstract  Eutrophication of lakes has affected society in many regions, particularly in water scarce environments where: i) low runoff reduces the self-purification potential of water bodies; ii) water supply relies on surface reservoirs, which are susceptible to nutrient enrichment. This work presents an assessment of the impact of the silted sediment management on the trophic status of a tropical surface reservoir with intense temporal variability of water storage. A complete mixing model describing the total phosphorus budget in the water and sediments was used, based on semi-empirical formulations. The sediment reuse as soil fertilizer has been proposed to increase productivity in small scale agriculture, which should also enhance the water quality by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water-sediment interaction; Sediment reuse; Eutrophication; Water quality modelling; Tropical reservoir.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100601

Trophic dynamics (Dissolved Inorganic Nitrogen-DIN and Dissolved Inorganic Phosphorus-DIP) in tropical urban estuarine systems during periods of high and low river discharge rates
Provedor de dados: 42
Autores: NORIEGA,CARLOS; ARAUJO,MOACYR; FLORES-MONTES,MANUEL; ARAUJO,JULIA.
Abstract: This paper focused on the use of the biogeochemical LOICZ (Land Ocean Interactions in the Coastal Zone) to investigate the dynamics of DIN and DIP nutrients among three highly urbanized tropical estuaries (Barra das Jangadas (BJ), Recife (RE) and Timbó (TB)), located in the northeastern region of Brazil. The input data were obtained through in situ measurements (2007) and governmental agency databases (2001-2007). The balances of the non-conservative elements showed that the RE and TB systems alternated between sources and sinks during the observation periods (0.2-0.8 mmoles DIP m-2 d-1 and 0.1-10 mmoles DIN m-2 d-1). The metabolism rates in the systems indicated that the BJ system was autotrophic during the two observation periods (10-26 mmoles...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nutrients dynamics; Estuarine; Eutrophication; Modelling; Brazil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300502

Phosphorus dynamics in a highly polluted urban drainage channel-shallow reservoir system in the Brazilian semiarid
Provedor de dados: 42
Autores: ARAÚJO,GERMÁRIO M.; LIMA NETO,IRAN E.; BECKER,HELENA.
Abstract: This paper investigates phosphorus dynamics in a highly polluted system composed of a drainage channel followed by a shallow reservoir in the city of Fortaleza, Brazilian semiarid. During the dry season, significant non-point source loads of total phosphorus originated from residences unconnected to sewers were identified along the channel, resulting in an increasing flow rate of untreated sewage towards the reservoir. During the rainy season, as a consequence of dilution, phosphorus concentrations decreased by about 5-fold. The results also revealed that the reservoir was acting similarly to a waste stabilization pond, with phosphorus removal efficiency of about 33%. Assuming one-dimensional flow for the channel and complete mixing for the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffuse pollution; Eutrophication; Nutrients; Semiarid; Urbanization; Water quality modeling.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500902

Seasonal effects of wastewater to the water quality of the Caeté river estuary, Brazilian Amazon
Provedor de dados: 42
Autores: Pereira,Luci C.C.; Monteiro,Marcela C.; Guimarães,Danielly O.; Matos,Jislene B.; Costa,Rauquírio M. da.
Bragança's socioeconomic situation is highly dependent on estuarine and marine biological resources that are influenced by tidal cycles and climatology. Field measurements (hydrological, hydrodynamic and microbiological variables) were taken in the most urbanized zone from Caeté estuary to characterise the quality of the local environment. During the dry period, the estuary was more eutrophic and presented the highest temperature (30.5 °C in Oct./06), salinity (17 psu in Feb./07), pH (8.24 in Feb./07) and fecal coliform (&gt; 1000 MPN/100 ml in Dec./06 and Feb./07) values. The phytoplankton Cyclotella meneghiniana, Coscinodiscus centralis and other r-strategist species were observed. The lack of basic hydric canalization was responsible for the local...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Equatorial estuary; Temporal variation; Eutrophication; Northern Brazil.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200022

Influence of water volume reduction on the phytoplankton dynamics in a semi-arid man-made lake: A comparison of two morphofunctional approaches
Provedor de dados: 42
Autores: BRAGA,GUSTAVO G.; BECKER,VANESSA.
Abstract  Significant reductions in the water levels of lakes are influenced by droughts and freshwater demands, especially in semi-arid regions, where hydric stress is greater. The aim of this study was to investigate the dynamics of phytoplankton during two different water volume periods resulting from an extended drought in a semi-arid lake. Another objective was to compare two functional approaches to test which one of these best captures phytoplankton variability as a function of environmental variability. Multivariate analyses performed using the Reynolds Functional Groups (RFG) and Morphology-Based Functional Groups (MBFG) classification schemes indicated two periods, high and a low water volume. The results demonstrated the importance of light...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydric deficit; Cyanobacteria; Eutrophication; Reynolds Functional Groups; Morphology-Based Functional Groups.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100707

Low water quality in tropical fishponds in southeastern Brazil
Provedor de dados: 42
Autores: COSTA,SIMONE M.; APPEL,ELEONORA; MACEDO,CARLA F.; HUSZAR,VERA L.M.
Expansion of aquaculture around the world has heavily impacted the environment. Because fertilizers are needed to raise fish, one of the main impacts is eutrophication, which lowers water quality and increases the frequency of algal blooms, mostly cyanobacteria. To evaluate whether the water quality in 30 fishponds in southeastern Brazilian met the requirements of Brazilian legislation, we analyzed biotic and abiotic water conditions. We expected that the high nutrient levels due to fertilization would cause low water quality. We also analyzed cyanotoxins in seston and fish muscle in some systems where cyanobacteria were dominant. The fishponds ranged from eutrophic and hypereutrophic with high phytoplankton biomass. Although cyanobacteria were dominant in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cyanobacteria; Cyanotoxins; Eutrophication; Fish culture.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301181

Invasion of the dinoflagellate Ceratium furcoides (Levander) Langhans 1925 at tropical reservoir and its relation to environmental variables
Provedor de dados: 49
Autores: Silva,Lidiane Cristina da; Leone,Isabela Carnielli; Santos-Wisniewski,Maria José dos; Peret,Alberto Carvalho; Rocha,Odete.
Dinoflagellates of the genus Ceratium are chiefly marine but there are rare occurrences in freshwater. In this study we analyze the invasion and progressive establishment of Ceratium furcoides, an exotic species, in the Furnas Reservoir. Samples were taken at 36 points in the reservoir, during the months of March, June, September and December, 2007. Measurements of some physical and chemical variables were simultaneously performed at each site. The occurrence of C. furcoides was registered at 20 sites, with densities varying between 0.57 and 28,564,913.0 ind.m-3. Blooms of this species were recorded in points which were classified as mesotrophic, coinciding with the places receiving high amounts of untreated domestic sewage. C. furcoides density was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Invasive species; Algal blooms; Eutrophication; Reservoir ecology.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000200010

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil
Provedor de dados: 49
Autores: Faustino,Samantha Borges; Fontana,Luciane; Bartozek,Elaine Cristina Rodrigues; Bicudo,Carlos Eduardo de Mattos; Bicudo,Denise de Campos.
Fresh water biodiversity is an increasing concern due to growing human impact. Herein, we report a long-term survey (ca. 90 years) of sedimentary diatoms and the modern flora from surface sediments and their biodiversity changes along a eutrophication gradient. Study was carried out in one of the most important water supply reservoirs (Guarapiranga Reservoir) of São Paulo Metropolitan Region, Brazil. Results are based on 75 core subsamples (subfossil assemblages from core) previously dated by 210Pb and 14 samples from surface sediments (modern assemblages). Overall, 84 taxa were reported, belonging to 30 genera, 71 species and eight non-typical varieties, besides five probable new taxa. Results expanded two new additions for the Brazilian diatom flora...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillariophyta; Biodiversity change; Eutrophication; Guarapiranga Reservoir; Paleolimnology; Species richness.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000200203

Evaluation of the water quality of tidal creeks of Pontal do Paraná, Paraná, Brazil
Provedor de dados: 52
Autores: Siqueira,Adriana; Godinho,Mirna Januária Leal; Kolm,Hedda Elisabeth; Machado,Eunice da Costa.
The aim of this wat was to evaluate the water quality in four tidal creeks of Paraná, Brazil, with different anthropic influences. Samples were collected every three months. Temperature, salinity, pH, alkalinity, total CO2, dissolved O2, nitrite, nitrate, N-ammoniacal, phosphate, silicate, particulate suspended matter, humic matter, total chlorophyll, total and fecal coliform bacteria of surface water were measured in each sample and compared. For all the stations water temperature was lower in winter, but ranged within typically subtropical values. Salinity (7 - 25) and pH (7.08 - 7.91) were higher in Perequê tidal creek indicating that only this tidal creek was strongly influenced by the nearby ocean waters. Lower dissolved O2, reaching anoxic levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tidal creek; Eutrophication; Coast of Paraná.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200028

Impact of the Icaraí Sewage Outfall in Guanabara Bay, Brazil
Provedor de dados: 52
Autores: Marques Júnior,Aguinaldo Nepomuceno; Crapez,Mirian Araujo Carlos; Barboza,Conceição Denise Nunes.
The present study aimed to evaluate the water quality of the Icaraí Sewage Outfall (ISEO) area. Sampling was conducted during winter and summer, and water samples were analyzed for dissolved oxygen, pH, temperature, salinity, dissolved inorganic nutrients (DIN), seston, particulate organic matter (POM), and pigments. Results showed that the water chemistry of the area suffers temporal and spatial variation. Great variability was also seen in the C:N:P ratios of POM (August, 112:30:1; December, 59:11:1) and in the DIN concentrations. Chlorophyll-a and ammonium concentrations (4.5 µg L-1 - 71.2 µg L-1, and 0.20 µM - 52,6 µM, respectively) characterized the ISEO area as eutrophic. The dispersal of the material was not effective under certain oceanographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eutrophication; Sewage outfall; Water pollution; Nutrients; Guanabara Bay.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500014

Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation
Provedor de dados: 52
Autores: Gonzalez,Alessandra M.; Paranhos,Rodolfo; Andrade,Luciana; Valentin,Jean L.
The aim of this work was to evaluate the necessary ³H-leucine concentration to estimate bacterial production in Guanabara Bay through saturation curves. A second aim was to collect preliminary data of bacterial production in two distinct sites corresponding to different water qualities: Urca inlet and Governador Island. Saturation curves were made with water samples taken at the main circulation channel of the bay, Paquetá Island, and the two sites mentioned before. The ³H-leucine curves showed similar pattern for all studied areas, indicating the ideal isotope concentration to be 10 nM. Bacterial biomass production ranged from 0.40 to 4.53 µgC L-1 h-1 in Urca and from 3.86 to 73.72 µgC L-1 h-1 in Governador Island indicating the relationship between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterioplankton; Activity measurement; Heterothrophic production; Estuary; Water pollution; Eutrophication.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500008

Influence of effluents from a Wastewater Treatment Plant on nutrient distribution in a coastal creek from southern Brazil
Provedor de dados: 52
Autores: Santos,Isaac Rodrigues; Costa,Ronaldo Cataldo; Freitas,Ubiratan; Fillmann,Gilberto.
The hypothesis that effluents treated through activated sludge process cause changes in nutrient biogeochemistry of receiving water bodies was investigated in Vieira creek, southern Brazil. Dissolved oxygen, suspended matter, and pH did not vary among the sampling stations. Nutrient, biochemical oxygen demand, and conductivity values were significantly higher downstream from the Wastewater Treatment Plant (WWTP) effluents. Further downstream, nitrate concentrations were higher due to ammonium nitrification, organic matter remineralization and/or the occurrence of unidentified sources. Per capita nutrient emission factors were estimated to be 0.16 kg P.yr-1 and 4.14 kg N.yr-1. Under pristine conditions, low N:P ratios were observed, which were significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Activated sludge; Nutrients; Contamination; Coastal zone; Biogeochemistry; Eutrophication.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100019

Floating Aquatic Macrophytes Decrease the Methane Concentration in the Water Column of a Tropical Coastal Lagoon: Implications for Methane Oxidation and Emission
Provedor de dados: 52
Autores: Fonseca,André Luiz dos Santos; Marinho,Claudio Cardoso; Esteves,Franscisco de Assis.
ABSTRACT In wetlands, the knowledge accumulated on the role of aquatic plants in the methane cycle focused on emergent macrophytes, to the detriment of other typologies. Herein, we evaluated whether the free-floating macrophyte Salvinia auriculata Aubl. and the floating-leaved macrophyte Eichhornia azurea (Sw.) Kunth. decrease the water column methane concentrations compared to a plant-free surface. We prepared microcosms by inserting an individual of S. auriculata or of E. azurea into chambers filled with lagoon water previously bubbled with CH4. Another set of chambers was incubated only with the prepared water, representing the plant-free surface. Half of the chambers were kept in the dark and half in sunlight to simulate a diel cycle. We observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Eutrophication; Global warming; Eichhornia azurea; Salvinia auriculata.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100702

Heterotrophic bacteria abundances in Rodrigo de Freitas Lagoon (Rio de Janeiro, Brazil)
Provedor de dados: 58
Autores: Gonzalez,Alessandra M.; Paranhos,Rodolfo; Lutterbach,Márcia S.
The Rodrigo de Freitas Lagoon (RJ, Brazil) is an important coastal ecosystem that has been submitted to an accelerated degradation process. The aim of this work was to determine the abundance and the spatial distribution of total heterotrophic (by flow cytometry) and cultivated bacteria ("pour plate" method on R2A agar). Another objective was to evaluate the lagoon's influence on water quality of Ipanema and Leblon beaches. Physical and chemical data were acquired too. Sub-superficial water samples were taken monthly, from December 1999 to October 2000. On lagoon, the cultivated bacteria abundance varied from 6.9x10(5) to 5.0x10(7) CFU.100 mL-1. On Ipanema and Leblon beaches, this parameter yielded 1.4x10(5) and 2.8x10(6) CFU.100 mL-1, respectively. Total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterioplankton; Flow cytometry; Eutrophication; Water pollution; Rodrigo de Freitas Lagoon.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000400005

Ecological aspects of the antimicrobial resistence in bacteria of importance to humn infections
Provedor de dados: 58
Autores: Meirelles-Pereira,Frederico de; Pereira,Angela de Meirelles Santos; Silva,Márcio Cataldo Gomes da; Gonçalves,Verônica Dias; Brum,Paulo Roberto; Castro,Almeida Ribeiro de; Pereira,Alexandre Adler; Esteves,Francisco de Assis; Pereira,José Augusto Adler.
In view of the intimate relationship of humans with coastal lagoons (used for recreation, tourism, water supply, etc.), the discharge of domestic effluents may lead to the establishment of routes of dissemination of pathogenic microorganisms, including microorganisms carrying genes for resistance to antimicrobials, through the surrounding human communities. The objective of the present investigation was to relate the presence of antimicrobial-resistant bacteria to the environmental characteristics of three coastal lagoons, comparing the results with those from hospital sewage. Of the lagoons evaluated, two (Geribá and Imboassica) receive domestic sewage discharge, and the other (Cabiúnas) is still in a natural state. We isolated in a culture medium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial resistance; Eutrophication; Sanitary microbiology; Environmental microbiology.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000400002