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Registros recuperados: 150
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Ability of taxonomic diversity indices to discriminate coastal lagoon environments based on macrophyte communities ArchiMer
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 < 0.05) and Salse-Leucate had a significant higher variation in taxonomic distinctness (p <...
Tipo: Text Palavras-chave: Languedoc Roussillon; Exotic species; Human impact; Eutrophication; Biodiversity.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-748.pdf
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Achieving good environmental status in the Black Sea: scale mismatches in environmental management Ecology and Society
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
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Agricultura e qualidade da agua: contaminacao da agua por nitrato. Infoteca-e
RESENDE, A. V. de..
2002
Tipo: Documentos (INFOTECA-E) Palavras-chave: Qualidade da agua; Contaminacao; Nitrogenio; Fosforo; Recurso hidrico; Saude; Impacto ambiental; Poluicao da agua; Water quality; Contamination; Nitrogen; Phosphorus; Water resources; Nitrates; Health; Environmental impact; Water pollution; Eutrophication.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/546464
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Algal food processing by Stegastes nigricans, an herbivorous damselfish: differences between an undisturbed and a disturbed coral reef site (La Reunion, Indian Ocean) ArchiMer
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
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Alteraciones de indicadores biológicos de Gambusia puncticulata (Poey, 1854) en sitios muy contaminados del río Almendares OceanDocs
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
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ALTERATION OF NITROGEN CYCLING BY AGRICULTURAL ACTIVITIES, AND ITS ENVIRONMENTAL AND HEALTH CONSEQUENCES Gayana Botánica
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
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Ambiance rose production and nutrient supply in soil irrigated with treated sewage AGRIAMBI
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
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Animal-based agriculture, phosphorus management and water quality in Brazil: options for the future Scientia Agricola
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
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Apports d'origine agricole et qualité des eaux côtières ArchiMer
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
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Aquatic Hyphomycetes in the Parque Estadual das Fontes do Ipiranga - PEFI, São Paulo, Brazil Rev. Bras. Bot.
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
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Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation BABT
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
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Benthic foraminifera as bio-indicators of drill cutting disposal in tropical east Atlantic outer shelf environments ArchiMer
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
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Biogeochemical aspects of bottom anoxia in a Mediterranean lagoon (Thau, France) ArchiMer
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
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Biological Diversity and Resilience: Lessons from the Recovery of Cichlid Species in Lake Victoria Ecology and Society
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
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Calidad ambiental y capacidad de autodepuración de la laguna costera El Doctor. Playa Baracoa, Habana, Cuba OceanDocs
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
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Caractéristiques du feutrage algal des récifs coralliens de Polynésie française soumis à différentes intensités de bioérosion ArchiMer
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
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Caracterização da hidrodinâmica e do estado trófico da lagoa de Bilene, Sul de Moçambique OceanDocs
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
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Changes in the annual harmful algal blooms of Alexandrium minutum : effects of environmental conditions and drainage basin inputs in the Rance estuary (Brittany, France) ArchiMer
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
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Combining Supply and Demand Estimates for Ecosystem Services from Cropland AgEcon
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
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Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil Biota Neotropica
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
Registros recuperados: 150
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