Consulta: subjectFacets:"Sediment"
Registros recuperados: 165
Data/hora: 12/06/2024 05:12:24

Quantifying Expected Ecological Response to Natural Resource Legislation: a Case Study of Riparian Buffers, Aquatic Habitat, and Trout Populations
Provedor de dados: Ecology and Society
Autores: Jones, Krista L; Institute of Ecology, University of Georgia; kjones@eco-metrics.com; Poole, Geoffrey C; Eco-metrics, Inc. and Institute of Ecology, University of Georgia; gpoole@eco-metrics.com; Meyer, Judy L; Institute of Ecology, University of Georgia; jlmeyer@uga.edu; Bumback, William; River Basin Center, University of Georgia; wbumback@uga.edu; Kramer, Elizabeth A; Natural Resources Spatial Analysis Laboratory, University of Georgia; lkramer@uga.edu.
Regulations governing the management of streamside vegetation (riparian buffers) lie at a nexus between environmental, social, and land development interests, and can yield especially contentious debates among stakeholders.  In 2001, the State Legislature of Georgia, USA, took up this debate; the Legislature reduced the minimum width of mandatory-forested riparian buffers along designated trout streams from &amp;#8764;30 m (100 ft) to &amp;#8764;15 m (50 ft), and commissioned this study to assess the expected response of existing trout populations.  Because our research was designed to provide rigorous and accessible data for informing this management debate, this research may serve as a general template for other studies designed to inform regulatory and...
Tipo: Peer-Reviewed Reports
Palavras-chave: Georgia; Natural resource legislation; Riparian buffer width; Scientific assessment; Sediment; Southern Appalachians; Stream temperature; Trout.
Ano: 2006

Sediments and herbivory as sensitive indicators of coral reef degradation
Provedor de dados: Ecology and Society
Autores: Goatley, Christopher H. R.; College of Marine and Environmental Sciences, James Cook University; Australian Research Council Centre of Excellence for Coral Reef Studies; christopher.goatley@jcu.edu.au; Fox, Rebecca J.; College of Marine and Environmental Sciences, James Cook University; Australian Research Council Centre of Excellence for Coral Reef Studies;  Division of Evolution, Ecology and Genetics, Australian National University; School of Life Sciences, University of Technology Sydney; rebecca.fox-1@uts.edu.au; Bellwood, David R.; College of Marine and Environmental Sciences, James Cook University; Australian Research Council Centre of Excellence for Coral Reef Studies; david.bellwood@jcu.edu.au.
Around the world, the decreasing health of coral reef ecosystems has highlighted the need to better understand the processes of reef degradation. The development of more sensitive tools, which complement traditional methods of monitoring coral reefs, may reveal earlier signs of degradation and provide an opportunity for pre-emptive responses. We identify new, sensitive metrics of ecosystem processes and benthic composition that allow us to quantify subtle, yet destabilizing, changes in the ecosystem state of an inshore coral reef on the Great Barrier Reef. Following severe climatic disturbances over the period 2011-2012, the herbivorous reef fish community of the reef did not change in terms of biomass or functional groups present. However, fish-based...
Tipo: Peer-Reviewed Reports
Palavras-chave: Disturbances; Ecosystem state; Herbivory; Management; Monitoring; Processes; Resilience; Sediment; Thresholds.
Ano: 2016

GEOCHEMICAL BACKGROUND IN AN OXISOL
Provedor de dados: Engenharia Agrícola
Autores: Cembranel,Adir S.; Sampaio,Silvio C.; Remor,Marcelo B.; Gotardo,Jackeline T.; Rosa,Pábolla M. Dalla.
ABSTRACT Geochemical background establishment is indispensable to determine the actual state of contamination of soils and sediments. However, no scientific consensus exists regarding the methodology for determining these values. In this context, this study aimed to establish the geochemical background in an Oxisol (Rhodic Hapludox) by means of an integrated method that uses direct and indirect soil analyses to identify the most appropriate calculation methodology. Soil samples were collected in a permanent preservation area of the Cascavel River watershed, PR, Brazil. The elements Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, and Zn present in soil samples were quantified by flame atomic absorption spectrometry. The use of a permanent preservation area is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trace elements; Heavy metals; Sediment; Soil.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300565

Fluxo de sedimentos em suspensao na bacia Araguaia-Tocantins.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: LIMA, J. E. F. W.; SANTOS, P. M. C. dos; CARVALHO, N. de O.; SILVA, E. M. da.
bitstream/CPAC-2009/24369/1/p2003_20.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: ECAGUA150; Brasil; Hidrology; Sediment; Hidrography.; Bacia Hidrográfica; Hidrografia; Hidrologia; Sedimento.; Brazil; Watersheds.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566653

Aporte de nutrientes e sólidos suspensos no Rio Taquari.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: OLIVEIRA, M. D. de; CALHEIROS, D. F.
A agricultura intensiva, pastagens cultivadas, garimpo, agroindústria e os efluentes urbanos estão entre os principais fatores que causam alterações ambientais no Pantanal e rios associados (Ferreira et. al., 1994). Estas atividades estão concentradas principalmente nas áreas de planalto e têm gerado aumentos no aporte de nutrientes e sedimentos para a planície. Um bom exemplo, é rio Taquari, um dos maiores tributários da bacia do alto rio Paraguai (Brasil; 1997). A bacia hidrográfica do rio Taquari está localizada entre as latitudes de 17°00'00''S e 20°00'00''S e as longitudes de 53°00'00''W e 58°00'00''W, abrangendo uma área de aproximadamente 65.023 km2, dentro da bacia do Alto Paraguai (BAP). No fim do alto curso, o rio Taquari recebe o rio Coxim com...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Assoreamento; Sólido suspenso; Característica; Rio Taquari; Sediment; Nutrient; Characteristic; Taquari river.; Água; Limnologia; Nutriente; Sedimento.; Limnology; Water.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810732

Contaminação por mercúrio em sedimento e moluscos da Bacia do rio Bento Gomes, MT.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: VIEIRA, L. M.; ALHO, C. J. R.
Os níveis de mercúrio total detectados no sedimento e tecidos moles de moluscos gastrópodos provenientes da bacia hidrográfica do rio Bento Gomes, embora baixos, mostraram indícios de contaminação. De um total de 69 amostras de sedimento analisadas, 26% apresentaram níveis de mercúrio total variando de 0,01 a 0,25 µg.g-1 de mercúrio (peso úmido). Os níveis de mercúrio obtidos em 54 amostras dos moluscos Ampullaria scalaris; A. canaliculata e Marisa planogira evidenciaram que 39% estavam contaminadas com níveis variando de 0,02 a 1,6 µg.g-1 de peso úmido. Estes resultados indicam que o mercúrio utilizado na extração de ouro de aluvião está atingindo o ambiente aquático e contaminado o sedimento e os organismos bentônicos desta área do Pantanal.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Biomagnificação; Mollusc; Biomagnification; Sediment; Pantanal wetland.; Molusco; Mercúrio; Sedimento.; Pantanal; Mercury.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/811631

Impacto do sedimento sobre o desenvolvimento do perifíton no Rio Taquari, Pantanal, MS.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: OLIVEIRA, M. D. de; RODRIGUES, L.
As macrófitas aquáticas são muito abundantes em áreas alagadas como as do Pantanal, e fornecem um vasto substrato para a microbiota, em particular para a comunidade perifítica. Foi avaliado o efeito da deposição de sedimento sobre a comunidade perifítica ao longo de 40km do trecho final do rio Taquari, em 12 estações de amostragem, em setembro de 1998. Foram coletados pecíolos de Eichhornia azurea, raspados e filtrados para análise da biomassa perifítica (clorofila a e peso seco). Foram tomadas amostras de raízes, caules e folhas da macrófita para análise do sedimento aderido. E as características da água também foram estudadas. Do sedimento suspenso analisado, 55% foi depositado até a última estação, e 86% é de origem inorgânica. A transparência da água...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Deposição; Macrófita aquática; Rio Taquari; Sediment; Deposition; Aquatic macrophyte; Aquatic plant; Taquari river; Wetland.; Impacto Ambiental; Perifiton; Planta Aquatica; Sedimento.; Pantanal; Environmental impact; Periphyton.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810756

Teores de P2O5 e K2O nos sedimentos das inundações periódicas em solo Glei Pouco Húmico.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: MELEM JUNIOR, N. J.; CAVALCANTE, E. da S.; LOPES FILHO, R. P.
Este trabalho objetivou estimar os teores dos elementos P2O5 e K2O presentes nos sedimentos depositados nas várzeas.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Sediment; Solo de várzea.; Fertilidade do Solo; Fósforo; Potássio; Sedimento; Solo.; Soil.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/344116

Using geochronology to reconstruct the evolution of particulate phosphorus inputs during the past century in the Papeete Lagoon (French Polynesia)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Harris, Pierre; Fichez, Renaud; Fernandez, Jean Michel; Golterman, Han; Badie, Christian.
During the past century, the sediment deposition rate has been assessed by measuring excess Pb-210 activity in a sediment core sampled in the harbour area of the Papeete Lagoon (Tahiti, French Polynesia). Dated sediment samples were analysed following a sequential extraction method to quantify five sedimentary phosphorus pools: loosely sorbed or exchangeable phosphorus, ferric iron-bound phosphorus, authigenic calcium carbonate associated phosphorus, detrital apatite and detritic inorganic phosphorus, acid organic phosphorus. Results from sediment dating showed the core to cover the period from 1865 to 1995, with a sharp change around 1957 corresponding to a doubling in sediment deposition rates. From the bottom to the top of the core, concentrations...
Tipo: Text
Palavras-chave: Géochronologie; Phosphore; Sédiment; Lagons coralliens; Geochronology; Phosphorus; Sediment; Coral reef lagoon.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43365/42850.pdf

Matière organique et pollution par les hydrocarbures dans les sédiments superficiels du golfe d'Arzew (mer Méditerranée, Algérie)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Buscail, R; Foudil-bouras, Ae; Pauc, H.
The distribution of global organic parameters (organic carbon, nitrogen, hydrolyzable carbon) was established in surficial sediments of the Gulf of Arzew. Moreover, humic substances, humin and hydrocarbons have provided information on the organic matter origin and evolution in the identified sedimentary areas: prodeltas at the mouth of the dry rivers Cheliff and Macta; muddy mid-deposits and carbonated shallow environments. The higher organic matter concentrations characterize the muddy mid-deposits and especially the western part located near the Arzew and Bethioua harbours (TOC &gt; 0.9 %; Nt = 0.35 % d.w.). The marine origin of the organic matter is supported by low C/N ratios (5-9) in the total sediments and the position in the Van Krevelen diagram of...
Tipo: Text
Palavras-chave: Sédiment; Matière organique; Substance humique; Hydrocarbure; Marge algérienne; Sediment; Organic matter; Humic substance; Hydrocarbon; Algerian margin.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43612/43914.pdf

Water column and recent sediment data on diatoms and coccolithophorids, off Portugal, confirm sediment record of upwelling events
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Abrantes, F; Moita, Mt.
Diatom and coccolithophorid abundance and diatom assemblage composition found in the water column along the Portuguese margin, during upwelling and non-upwelling conditions, are compared to the distribution patterns observed in the recent sediments from the same area. The water column results indicate a one order of magnitude increase in phytoplankton biomass during upwelling conditions (summer), with diatoms being the most important contributors. Coccolithophorids, on the contrary, dominate the phytoplankton in winter (non-upwelling), The comparison of the upwelling and non-upwelling spatial distribution of these phytoplankton groups to their sedimentary record reveals the sediment record as a reflection of the upwelling situation, preserving most of its...
Tipo: Text
Palavras-chave: Upwelling; Portugal; Diatomée; Colonne d'eau; Sédiment; Upwelling; Portugal; Diatom; Water column; Sediment.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43630/43253.pdf

Changes in seabed morphology, mud temperature and free gas venting at the Håkon Mosby mud volcano, offshore northern Norway, over the time period 2003-2006
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Foucher, Jean-paul; Dupre, Stephanie; Scalabrin, Carla; Feseker, Tomas; Harmegnies, Francois; Nouze, Herve.
The Håkon Mosby mud volcano is a 1.5-km-diameter geological structure located on the Southwest Barents Sea slope at a water depth of 1,270 m. High-definition seabed mapping of the mud volcano has been carried out in 2003 and 2006. A comparative analysis of the bathymetry and backscatter maps produced from the two surveys shows subtle morphological changes over the entire crater of the mud volcano, interpreted to be the consequence of mud eruption events. Mud temperature measurements point to a persistently warm mud at shallow depth in the crater. This is explained by upward fluid advection, rather than conductive cooling of mud flows. The small-scale spatial variability in the temperature distribution may be related to mud outflows or changes in the fluid...
Tipo: Text
Palavras-chave: Sw barents sea; Cold seep ecosystems; Fluid flow; Methane; Sediment; Onshore; Fluxes; Margin; Water.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00004/11527/10261.pdf

DNA extractions from deep subseafloor sediments: Novel cryogenic-mill-based procedure and comparison to existing protocols
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Alain, Karine; Callac, Nolwenn; Ciobanu, Maria Cristina; Reynaud, Yann; Duthoit, Frederique; Jebbar, Mohamed.
Extracting DNA from deep subsurface sediments is challenging given the complexity of sediments types, low bio-masses, resting structures (spores, cysts) frequently encountered in deep sediments, and the potential presence of enzymatic inhibitors. Promising results for cell lysis efficiency were recently obtained by use of a cryogenic mill (Lipp et al., 2008). These findings encouraged us to devise a DNA extraction protocol using this tool. Thirteen procedures involving a combination of grinding in liquid nitrogen (for various durations and beating rates) with different chemical solutions (phenol, chloroform, SDS, sarkosyl, proteinase, GTC), or with use of DNA recovery kits (MagExtractor (R)) were compared. Effective DNA extraction was evaluated in terms of...
Tipo: Text
Palavras-chave: Sediment; DNA extraction; Deep subsurface biosphere.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00056/16691/14364.pdf

Influence of environmental and anthropogenic factors on the composition, concentration and spatial distribution of microplastics: A case study of the Bay of Brest (Brittany, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Frere, L.; Paul-pont, I.; Rinnert, Emmanuel; Petton, Sebastien; Jaffre, J; Bihannic, Isabelle; Soudant, P.; Lambert, C.; Huvet, Arnaud.
The concentration and spatial distribution of microplastics in the Bay of Brest (Brittany, France) was investigated in two surveys. Surface water and sediment were sampled at nine locations in areas characterized by contrasting anthropic pressures, riverine influences or water mixing. Microplastics were categorized by their polymer type and size class. Microplastic contamination in surface water and sediment was dominated by polyethylene fragments (PE, 53–67%) followed by polypropylene (PP, 16–30%) and polystyrene (PS, 16–17%) microparticles. The presence of buoyant microplastics (PE, PP and PS) in sediment suggests the existence of physical and/or biological processes leading to vertical transfer of lightweight microplastics in the bay. In sediment (upper...
Tipo: Text
Palavras-chave: Microplastic; Coastal ecosystem; Surface water; Sediment; Raman spectroscopy; Hydrodynamic; Dispersal particle modelling.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00379/48994/51083.pdf

Campagne RNOSED 1998 - Analyse de la contamination des sédiments du littoral Nord / Pas-de-Calais / Picardie
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Desombre, Julie; Lefebvre, Alain; Bucas, Karenn.
The National Network of Observation (RNO) of the IFREMER is a monitoring network of the quality of the marine environment. This report is interested in the results of series of measurement from the RNO sediment of 1998 and relates to the analysis of the contamination of the coastal sediments from the Belgian coastal zone to Fécamp. Measurements relate to heavy metals and the organic compounds the such Polyaromatic Hydrocarbons (HAP), Polychlorobiphényles (PCB) and pesticides (DDT, Lindane). A statistical processing is carried out starting from the standardized metal contents and of the organic rough contents in order to highlight possible regroupings of intake points per level of pollution. The origins of the contamination given thanks to an inventory of...
Tipo: Text
Palavras-chave: Sédiment; RNO; Normalisation; Contaminants; Apports anthropiques; Sediment; RNO; Standardization; Contaminants; Anthropic fluxes.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00167/27821/26014.pdf

Short-term interactions between phytoplankton and intertidal seagrass vegetation in a coastal lagoon (Bassin d'Arcachon, SW France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: De Wit, Rutger; Troussellier, Marc; Courties, Claude; Buffan-dubau, Evelyne; Lemaire, Emmanuelle.
We experimentally simulated the temporality of the interactions between intertidal seagrasses and phytoplankton in the context of nutrient enrichment from continental origin. Phytoplankton development was retarded after 1-day exposure to intertidal Zostera noltii Hornemann vegetation samples, with respect to control treatments. This was not explained by resource competition and we hypothesized a direct interference between seagrass leaves and phytoplankton. After separation from the vegetation in 5-day incubations, the final yield of large phytoplankton, mainly diatoms and haptophytes, was determined by nutrient loading. In contrast, Synechococcus-like cells (SYN), phototrophic picoeukaryotes and nanophytoplankton decreased after day 3, most likely due to...
Tipo: Text
Palavras-chave: Competition; Allelopathy; Zostera noltii; Sediment; Intertidal vegetation; Flow cytometry; Photosynthetic pigments.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00106/21717/19414.pdf

Geochemical Characteristics of Iron in Sediments from the Sea of Marmara
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Yang, Hailin; Lu, Hailong; Ruffine, Livio.
Two ~1000 cm long sediment cores were recovered from the Sea of Marmara, one with the occurrence of gas hydrates in the Western High, and the other without hydrates in the Cinarcik Basin. Differences in mineralogical and chemical compositions have been identified between the two sediment cores. Based on the results of the mineralogical and geochemical analyses, the main sources of the sediments are quite similar for both investigated areas, but the authigenic components are different, particularly iron sulfides and carbonates. Authigenic Fe(II) carbonate are much higher in Core MRS-CS-05 in the Western High, while crystalline Fe(III) phases are more abundant in Core MRS-CS-16 in the Cinarcik Basin. Notably, the enrichments of greigite (Fe3S4), a metastable...
Tipo: Text
Palavras-chave: Iron geochemistry; The Sea of Marmara; Sediment; Redox environment.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00423/53455/54347.pdf

Analysis of slope failures in submarine canyon heads: An example from the Gulf of Lions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Sultan, Nabil; Gaudin, Mathieu; Berne, Serge; Canals, Miquel; Urgeles, Roger; Lafuerza, Sara.
To improve understanding of evolution of submarine canyons, a three-dimensional slope-stability model is applied to Bourcart Canyon in the western Gulf of Lions in the Mediterranean Sea. The model builds on previous work by Chen and others, and it uses the upper bound theorem of plasticity to calculate the factor of safety of a kinematically admissible failing mass. Examples of three-dimensional failure surfaces documented in the literature were used to test the model formulation. Model application to Bourcart Canyon employed the results of a detailed stratigraphic analyses based on data acquired by swath bathymetry, sub-bottom profiling, high-resolution seismic reflection surveys, and piston coring. The sediment layers were also characterized using...
Tipo: Text
Palavras-chave: Cascadia accretionary complex; Upper bound theorem; Stability analysis; Continental slope; Limit equilibrium; Western gulf; Offshore; Margin; Initiation; Sediment.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2410.pdf

Influence of oyster culture on biogeochemistry and bacterial community structure at the sediment-water interface
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Azandegbe, Afi; Poly, Franck; Andrieux, Francoise; Kerouel, Roger; Philippon, Xavier; Nicolas, Jean-louis.
Bacterial community structure and some biogeochemical parameters were studied in the sediment of two Pacific oyster farming sites, Aber Benoît (AB) and Rivière d'Auray (RA) in Brittany (France), to examine the ecological impact of oysters and to evaluate the emission of sulfide and ammonia from sediment. At AB, the organic matter accumulated in the sediment beneath the oyster tables was rapidly mineralized, with strong fluxes of ammonia and sulfide that reached 1014 μmol m−2 h−1 - and 215 μmol m−2 h−1, respectively, in June 2007. At RA, the fluxes were about half as strong on average and better distributed through the year. The ammonia and sulfide concentrations in the overlying water never reached levels that would be toxic to oysters in either site, nor...
Tipo: Text
Palavras-chave: Sediment; Biogeochemical parameters; Fluxes; Bacterial structure; Crassostrea gigas.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00079/19010/17083.pdf

Quantification of Vibrio parahaemolyticus, Vibrio vulnificus and Vibrio cholerae in French Mediterranean coastal lagoons
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cantet, Franck; Hervio-heath, Dominique; Caro, A; Le Mennec, Cecile; Monteil, Caroline; Quemere, Catherine; Jolivet-gougeon, Anne; Colwell, Rita R.; Monfort, Patrick.
Vibrio parahaemolyticus, Vibrio vulnificus and Vibrio cholerae are human pathogens. Little is known about these Vibrio spp. in the coastal lagoons of France. The purpose of this study was to investigate their incidence in water, shellfish and sediment of three French Mediterranean coastal lagoons using the most probable number-polymerase chain reaction (MPN-PCR). In summer, the total number of V. parahaemolyticus in water, sediment, mussels and clams collected from the three lagoons varied from 1 to &gt;1.1 x 10.3 MPN/l, 0.09 to 1.1 x 10.3 MPN/ml, 9 to 210 MPN/g and 1.5 to 2.1 MPN/g, respectively. In winter, all samples except mussels contained V. parahaemolyticus, but at very low concentrations. Pathogenic (tdh- or trh2-positive) V. parahaemolyticus were...
Tipo: Text
Palavras-chave: Vibrio; Lagoons; Shellfish; Water; Sediment; Human pathogen.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00148/25890/23889.pdf

Effect of sediment nearness on the metabolic enzyme activity and energy state of the oyster Crassostrea gigas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Moullac, Gilles; Fleury, Pierre-gildas; Le Coz, Jean-rene; Moal, Jeanne; Samain, Jean-francois.
This study was designed to assess in situ the effects of sediment nearness on Crassostrea gigas metabolism. One year-old oysters were reared for 5 months (April-August) in plastic bags on metallic frames at 10 and 60 cm off the sediment at the beginning of April. The management of the energetic resources (storage, consumption) was estimated with respect to biochemical changes of proteins, lipids and carbohydrates. In order to evaluate the  effect of the sediment nearness at cellular level, the metabolic rate was evaluated by assessing pyruvate kinase (PK) and phosphoenolpyruvate carboxykinase (PEPCK) enzyme activities and electron transport system (ETS) activity. The metabolic pathways were assessed by measuring ATP and intermediary metabolites such as...
Tipo: Text
Palavras-chave: Aspartate; Succinate; Alanine; ETS; PEPCK; PK; Carbohydrate; Lipids; Proteins; Sediment; Oyster; Aspartate; Succinate; Alanine; ETS; PEPCK; PK; Glucides; Lipides; Proteines; Sédiment; Huître.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2803.pdf

Effet des biodépôts de l'huître Crassostrea gigas (Thunberg) sur l'accumulation de matières organiques dans les parcs du bassin de Marennes-Oléron
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Sornin, Jean-marc; Feuillet, Michelle; Heral, Maurice; Deslous-paoli, Jean-marc.
The accumulation of biodeposits brings about geochemical modifications of the underlying sediment, that are noticeable. The increase can reach 83% of the amount of organic carbon. By catching the deposits on the spot and by gathering them directly from the oyster tables we get a daily deposit that can weigh, according to season, between 8 and 99 g of carbon a square meter. The recycling of important quantities of organic matter increase the oxygen needs and the most reducing environment provides opportunities for ammonification and reduction of sulfate into sulfur. So we can consider that there is as much as 4 times more sulfurous hydrogen in intensive oyster-growing areas. This output of sulfurs seems to cause the oyster filtration some damage (Ito et...
Tipo: Text
Palavras-chave: Marennes Oleron; Sediment; Oysters; Physiology; Filtration; Biodeposits; Crassostrea gigas; Marennes Oléron; Sédiment; Huître; Physilogie; Filtration; Biodépôts; Crassostrea gigas.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-2955.pdf

Summer mortality of Crassostrea gigas (Thunberg) in relation to environmental rearing conditions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Soletchnik, Patrick; Lambert, Christian; Costil, Katherine.
The purpose of this study is to investigate summer mortality of the cupped oyster, Crassostrea gigas, in relation to culture practices in the traditional oyster production region of Marennes-Oleron (France). Four oyster rearing conditions, varying culture location ("on-" or "off-bottom"), and site depth (65% to 80% daily immersion termed "deep" or 45% to 65%, termed "shallow") were studied to compare biologic performance and maturation status of oysters, in relation to sediment and water column parameters. The most severe mortality occurred in June to July in "on-bottom" reared oysters (25%), as compared with 10% mortality in "off-bottom" cultured oysters. Oysters (shell and meat) grew significantly better when reared "off-bottom" than "on-bottom."...
Tipo: Text
Palavras-chave: Summer mortality; Hydrology; Sediment; Marine ecosystem; Marennes Oleron Bay; Crassostrea gigas.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-3171.pdf

Cycle de l'azote à l' interface eau-sédiment dans le Bassin d'Arcachon : rôle des bactéries dans les processus de perte en azote (nitrification-dénitrification)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Riou, Stéphane Alain.
Bacterial nitrification and denitrification were studied in the sediments of the Bassin d'Arcachon, a macrotidallagoon located in the Southwestern Atlantic French coast colonized by extensive Zostera noltii  meadows. Nitrifiers were enumerated by MPN method. Densities were law : from 102 to 104 bacteria per ml of sediment presenting an increase during winter. Nitrifying activities were measured by NH4+  accumulation N-serve block technique. Activities were ranged from 0 to 90 µmol m-2 h-1 and nitrification represented 120-140 mmol m-2 yr-1 for intertidal sediments. The 15N  isotope pairing technique was applied to sediment samples from the whole bay for determining the denitrification rates. Average rates were 10-20 µmol m·2 h-1 with a maximum of 75 µmol...
Tipo: Text
Palavras-chave: Nitrification; Dénitrification; Sédiment; Zostera noltii; Lagune; NPP; N6SERVE; 15N; Nitrification; Denitrification; Sediment; Zostera noltii; Marine laboon; MPN; N-serve; 15N.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00443/55439/56959.pdf

Spring-arm core doser (SACC)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hartwig, Eo.
A spring-arm core doser (SACC) is described which does not disturb the sediment and is highly reliable. SA CC is designed to replace core catchers, baIl seals and other types of core retainers which disturb the sediments. SACC can be used on cores with a stationary, rigid outer frame. Additionally, SACC can accommodate various diameter core tubes. When attached to a disturbance free corer, SACC permits the retrieval of large diameter cores suit able for diagenetic, nutrient ex change and sediment-water interface studies.
Tipo: Text
Palavras-chave: SACC; Sediment; Carottier libre; SACC; Sediment; Free corer.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/00323/43412/43107.pdf

Subseafloor archaeal communities: from the surface to a deep hot biosphere?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Roussel, Erwan.
The sub-seafloor biosphere may contain two thirds of Earth's total prokaryotic biomass. The large and active microbial populations buried in the sub-seafloor play a key role in global biogeochemical cycles. However, little is known about these prokaryotic communities. The depth limit of this sub-seafloor biosphere is still unreached, and elevated temperatures as well as insufficient energy sources are the likely factors limiting life at depth. Interestingly, archaeal communities with unknown physiologies and no cultured relatives seem to have a key role in deep marine sediments and hydrothermal ecosystems.  As most deep biosphere microorganisms detected so far have been extremely resistant to cultivation, molecular approaches remain to date the most...
Tipo: Text
Palavras-chave: Sediment; Hydrothermal system; Ultramafic; CM DGGE; DGGE; PmoA; DsrA; McrA; AmoA; 16SrRNA; Bacteria; Archaea; Deep biosphere; Sédiment; Écosystème hydrothermal; Ultramafique; CM DGGE; DGGE; PmoA; DsrA; McrA; AmoA; 16SrRNA; Bacteria; Archaea; Biosphère profonde.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-4630.pdf

Evolution des caractéristiques chimiques et biologiques des sédiments en circuit clos. I. Azote et populations bactériennes en fonction de certains paramètres du milieu
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chamroux, S.; Boucher, G.
Chemical and Biological evolution of sediments in closed circuit : I. Nitrogen and bacteria. A series of well controlled sea water closed circuit sand filters al­lowed the study of chemical and biological regulation processes in the sediment. Bacteria, Nitrogen chemistry and meiofauna were mainly investigated. The evolution of the different forms of nitrogen is rather similar, whatever the organic matter flow in the sediment. As long as the amount of or­ganic input works as limiting factor, bacteria densities are proportional to its flow. No correlation was found between bacteria and chemical parameters in the sand or in the water. The temperature does not seem to play a determinant part neither in the evolution of bacteria nor in the mineralization of...
Tipo: Text
Palavras-chave: Circuit clos; Sédiment; Bactéries; Matière organique; Azote; Closed circuit; Sediment; Bacteria; Organic matter; Nitrogen.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41652/40861.pdf

When and why sediments fail to record the geomagnetic field during polarity reversals
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Valet, Jean-pierre; Meynadier, Laure; Simon, Quentin; Thouveny, Nicolas.
We present four new records of the Matuyama–Brunhes (M–B) reversal from sediments of the Equatorial Indian Ocean, West Equatorial Pacific and North Atlantic Oceans with deposition rates between 2 cm/kyr and 4.5 cm/kyr. The magnetic measurements were performed using 8 cc cubic samples and provided well-defined reverse and normal polarity directions prior and after the last reversal. In three records stepwise demagnetization of the transitional samples revealed a succession of scattered directions instead of a well-defined characteristic component of magnetization. There is no relationship with changes in magnetic mineralogy, magnetic concentration and magnetic grain sizes. This behavior could be caused by weakly magnetized sediment. However the transitional...
Tipo: Text
Palavras-chave: Geomagnetic reversals; Magnetization acquisition; Rock magnetism; Sediment; Demagnetization.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00347/45868/45561.pdf

Particulate matter and organic carbon budgets for the Gulf of Lions (NW Mediterranean)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P.
An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and...
Tipo: Text
Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf

Spatio-temporal variations in intertidal mudflat erodability: Marennes-Oleron Bay, western France
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Orvain, Francis; Sauriau, Pierre-guy; Le Hir, Pierre; Guillou, Gael; Cann, Philippe; Paillard, Michel.
A portable erosion device (ERIS) was deployed in November 2000 and May 2001 to investigate the spatio-temporal variation of fine-grained sediment erosion over a transect on the intertidal mudflats of Marennes-Oleron Bay, western France. The objective was to relate changes in bed erodability over diurnal emersion periods to bioturbation, rapid changes in sediment characteristics, and microphytobenthos biomass.   Macrofaunal assemblages were dominated by the bivalve, Scrobicularia plana, on the upper mudflat, and by the gastropod, Hydrobia ulvae. on the middle mudflat. A power relationship was obtained where tau(cr) was plotted as a function of sediment density. Results from the upper part of the mudflat deviated from this relationship due to bioturbation by...
Tipo: Text
Palavras-chave: EPS; Microphytobenthos; Erodability; Intertidal mudflat; Sediment; Scrobicularia plana; Hydrobia ulvae; Bioturbation; Resuspension; Eris.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3779.pdf

Coprostanol levels and organic enrichment in sediments of the Bilbao estuary (north of Spain)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Saiz-salinas, Ji; Gonzalez-oreja, Ja.
An assessment was made of the distribution of the faecal sterol coprostanol (COP) in sediments in the Bilbao estuary. Concentrations of COP ranged from 135.15 to 10.77 mu g g(-1) dry weight, from the inner to the open estuary, with a mean value of 51.43 mu g g(-1); the highest concentrations were found near the mouths of several tributaries flowing into the estuary. Comparisons with ether published values indicate that sediments from the Bilbao estuary are affected by sewage pollution in a similar degree to that reported for other estuaries in the world. Organic enrichment and anaerobic sediment conditions prevail in three-fourths of its watercourse bed. Since the spatial distribution of several organic sedimentary parameters could be clearly correlated...
Tipo: Text
Palavras-chave: Estuaire de Bilbao; Coprostanol; Sédiment; Enrichissement organique; Pollution; Bilbao estuary; Coprostanol; Sediment; Organic enrichment; Sewage pollution.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43689/43120.pdf

Correlations between dioxin-like and indicators PCBs: Potential consequences for environmental studies involving fish or sediment
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Babut, M.; Miege, C.; Villeneuve, B.; Abarnou, Alain; Duchemin, J.; Marchand, P.; Narbonne, J. F.
Among the numerous PCB congeners, most of the dioxin-like PCBs (DL-PCBs) need to be characterized by hyphenated techniques. It has been shown in several instances that these congeners are well related to the total PCB content in fish. We examined datasets collected mainly in France, on freshwater and marine fish and sediments. A statistical model linking DL- and indicator PCBs was developed for a dataset composed of freshwater fishes, and proved to predict well DL-PCBs from indicator PCBs in all other fish sets, including marine ones. Type II error rates remained low in almost all fish sets. A similar correlation was observed in sediments. Non-dioxin-like PCBs elicit various adverse effects and represent 95% of the total PCBs. A European guideline for them...
Tipo: Text
Palavras-chave: Sediment; Fish; Correlations; Indicator PCB; Dioxin like PCB.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6979.pdf

The intra-annual variability of soft-bottom macrobenthos abundance patterns in the North Channel of the Seine estuary
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Desroy, Nicolas; Janson, Anne-laure; Denis, Lionel; Charrier, Gregory; Lesourd, Sandric; Dauvin, Jean-claude.
Temporal and spatial variability of the Abra alba–Pectinaria koreni and Macoma balthica communities was examined in the northern part of the Seine estuary (North Channel) over different space and time scales in order to assess the role that the hydrologic regime and/or anthropogenic influences play in defining benthic communities over time. Sediment in the North Channel displayed strong spatial and temporal variability, sustained by intense sediment transport episodes. Total macrobenthic abundances ranged widely on the course of the year and there was no evidence of a seasonal signal for the density fluctuations, whatever the spatial scale considered. The bio-sedimentary dynamics can be divided into two periods: the first corresponds to the high flow rate...
Tipo: Text
Palavras-chave: Port 2000; Anthropogenic impacts; Abra alba community; Sediment; Bentho pelagic coupling; Temporal variability.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2613.pdf

Complex coupled metabolic and prokaryotic community responses to increasing temperatures in anaerobic marine sediments: critical temperatures and substrate changes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Roussel, Erwan; Cragg, Barry A.; Webster, Gordon; Sass, Henrik; Tang, Xiaohong; Williams, Angharad S.; Gorra, Roberta; Weightman, Andrew J.; Parkes, R. John.
The impact of temperature (0 - 80°C) on anaerobic biogeochemical processes and prokaryotic communities in marine sediments (tidal flat) was investigated in slurries for up to 100 days. Temperature had a non-linear effect on biogeochemistry and prokaryotes with rapid changes over small temperature intervals. Some activities (e.g. methanogenesis) had multiple “windows” within a large temperature range (~10 - 80°C). Others, including acetate oxidation, had maximum activities within a temperature zone, which varied with electron acceptor (metal oxide [up to ~34°C] and sulphate [up to ~50°C]). Substrates for sulphate reduction changed from predominantly acetate below, and H2 above, a 43°C critical temperature; along with changes in activation energies and types...
Tipo: Text
Palavras-chave: Sediment; Temperature; Anaerobic processes; Chemoorganotrophic; Chemolithotrophic; Mineralisation; Sulphate reduction; Methanogenesis; Acetogenesis.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00273/38464/36883.pdf

Modélisation des cycles de l'azote et du phosphore dans les sédiments d'une lagune soumise à une exploitation conchylicole
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chapelle, Annie; Mesnage, Valérie; Mazouni, Nabila; Deslous-paoli, Jean-marc; Picot, Bernadette.
A simulation of nitrogen and phosphorus exchanges for the sediment-water interface is presented, The aim of the sttudy is to understand the dynamic behaviour of an eutrophie coastal lagoon (Thau, France), ln situ experiments were performed to estimate the different pools of nitrogen and phosphorus in the water column and in the sediment. The diffusive fluxes between them were also estimated. A numerical mode1, simulating nitrogen and phosphorus cycles, was developed and calibrated with data recorded .at two seasons (winter and summer). This study leads to the conclusion that is necessary to know the different pools of nitrogen and phosphorus in order to estimate which fraction is bioavailable and the rate of nutrient exchange between sediment and water. It...
Tipo: Text
Palavras-chave: Modèle; Phosphore; Azote; Sédiment; Ecosystème conchylicole; Modelling; Phosphorus; Nitrogen; Sediment; Shellfish ecosystem.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00039/15026/12360.pdf

Archaeal Methane Cycling Communities Associated with Gassy Subsurface Sediments of Marennes-Oleron Bay (France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Roussel, Erwan; Sauvadet, Anne Laure; Allard, Jonathan; Chaduteau, Carine; Richard, Pierre; Cambon Bonavita, Marie-anne; Chaumillon, Eric.
In Marennes-Oleron Bay, a macro-tidal bay located on the French Atlantic coast, kilometer-scale acoustic turbidity reveals an accumulation of free gas in the sediment. Large concentrations of organic matter and rapid sedimentation rates provide ideal settings for biogenic methane cycling. We integrate seismic, sedimentologic, biogeochemical and molecular genetic approaches to determine whether microbial methane cycling is involved in this process. Here we show that the acoustic turbidity upper boundary matched with X-ray facies displaying fissures with the highest methane concentrations, demonstrating the existence of methane bubbles in the sediment. 16S rRNA and mcrA gene clone libraries were dominated by sequences affiliated to the three known ANME...
Tipo: Text
Palavras-chave: Sediment; Methane; McrA; 16S rRNA; Archaea.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6165.pdf

Impact of Oyster Farming on Diagenetic Processes and the Phosphorus Cycle in Two Estuaries (Britanny, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Andrieux, Francoise; Azandegbe, Afi; Caradec, Florian; Philippon, Xavier; Kerouel, Roger; Youenou, Agnes; Nicolas, Jean-louis.
This study aims to compare the impact of oyster cultures on diagenetic processes and the phosphorus cycle in the sediments of the Aber Benoît and the Rivière d’Auray, estuary of Brittany, France. Our results showed clear evidence of the seasonal impact of oyster cultures on sediment characteristics (grain size, organic matter parameters), and the phosphorus cycle, especially in the Aber Benoît. At this site, seasonal variations of sulfide and Fe concentrations in pore waters, as well as Fe-P concentrations in the solid-phase highlighted a shift from a system governed by iron reduction (Reference) to a system governed by sulphate reduction (Beneath Oyster). This could be partly explained by the increase in labile organic matter (ie, biodeposits) beneath...
Tipo: Text
Palavras-chave: Sediment; Phosphorus; Sulfide; Dissolved Fe/P ratios; Labile organic matter; Oyster cultures.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00209/32003/30441.pdf

Influence hydrothermale dans les sédiments de fosses de la mer Rouge par l'étude de quelques éléments traces
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pierret, Marie Claire; Clauer, Norbert; Blanc, Gerard.
The Cu, Ni, Fe, Cr and Zr concentrations were evaluated to study the influence of hydrothermal activity on the sediments of six Red-Sea deeps. Comparison between the Ni/Fe and Cu/Fe ratios supports distinction between hydrothermal and non-hydrothermal sediments, whereas anti-correlation between Zr and Cr concentrations results from hydrothermal influence. The results allow us to envisage that the sediments of the Suakin Deep did not undergo a hydrothermal activity and that this hydrothermal influence was weak in the Valdivia Deep. The sediments of Port-Soudan Deep recorded a hydrothermal activity, whereas this activity was the strongest in the Thetis and Atlantis II deeps.
Tipo: Text
Palavras-chave: Sédiment; Mer Rouge; Fosses; Hydrothermalisme; Métaux; Sediment; Red sea; Deeps; Hydrothermalism; Metals.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00323/43375/42836.pdf

Isotopic composition and speciation of sedimentary nitrogen and carbon in the Okinawa Trough over the past 30 ka
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Zheng, Li-wei; Hsiao, Silver Sung-yun; Ding, Xiao-dong; Li, Dawei; Chang, Yuan-pin; Kao, Shuh-ji.
Total organic carbon to total nitrogen ratios (C/N) and their isotopic compositions (δ13CTOC and δ15NTN) are oft-applied proxies to discern terrigenous from marine-sourced organics and to unravel ancient environmental information. In high depositional Asian marginal seas, the inclusion of N-bearing minerals in the bulk sediment dilutes or masks signals sought after in δ15N and δ13C analyses, thus leading to incorrect and even contradictory interpretations. We used KOH-KOBr to separate operationally defined total organic matter into oxidizable (labile) and residual fractions for content and isotope measurements. In a sediment core in the Okinawa Trough, significant amounts of carbon and nitrogen existed in the residual phase, in which the C/N ratio was ~9,...
Tipo: Text
Palavras-chave: Carbon; Nitrogen; Isotope; Okinawa Trough; Sediment; Total organic carbon.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00295/40584/39503.pdf

Modélisation du transport particulaire dans le Golfe du Lion en vue d'une application au devenir des traceurs radioactifs issus du Rhône
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Dufois, Francois.
Among the contaminants introduced into the environment, the artificial radionuclides appear particularly important to take into account because of their chemical toxicity and/or of their radiotoxicity. Some radionuclides present a high affinity with particles so that the study of the sediment dynamics is a useful preliminary to the study of their dispersion on the open sea. This thesis is focused on the fate of sediments in the Gulf of Lions (NW Mediterranean) and in particular on the impact of the Rhone River, which is the main source of particulate matter in the Gulf of Lions. In order to study the sediment transport mechanisms on various space and time scales, this thesis is based on mathematical modelling. The hydro-sedimentary model set up in the Gulf...
Tipo: Text
Palavras-chave: Waves; MARS 3D; Hydrodynamic; Radionuclides; Modelling; Sediment; Rhône prodelta; Gulf of Lions; Vagues; MARS 3D; Hydrodynamique; Radioéléments; Modélisation; Sédiment; Prodelta du Rhône; Golfe du Lion.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6308.pdf

Lessons learned from an intercalibration exercise on the quantification and characterisation of microplastic particles in sediment and water samples
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cadiou, Jean-francois; Gerigny, Olivia; Koren, Š.; Zeri, C.; Kaberi, H.; Alomar, C.; Panti, C.; Fossi, M.c.; Adamopoulou, A.; Digka, N.; Deudero, S.; Concato, M.; Carbonell, A.; Baini, M.; Galli, M.; Galgani, Francois.
An intercalibration exercise on the characterisation of microplastics in marine sediment and water samples was carried out among five laboratories involved in the implementation of the Marine Strategy Framework Directive (MSFD) in their country. The samples were prepared by mixing cleaned natural sediment and sea water with microplastics sets made of particles of various polymers, shapes and colours. Overall, the errors on total counts were under 25% in absolute value. The risk of non-detection and loss of particles is greater than the risk of contamination during sample analysis. Significant differences are observed among particle types. It appears difficult to obtain reliable and comparable data on the colour of microplastics. A comparison of the errors...
Tipo: Text
Palavras-chave: Microplastics; Intercalibration; Protocols; Sediment; Seawater.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00622/73397/72812.pdf

Premières observations sur la morphologie et les processus sédimentaires récents de l'Éventail celtique
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Auffret, Gérard-andré; Zaragosi, S; Voisset, Michel; Droz, Laurence; Loubrieu, Benoit; Pelleau, Pascal; Savoye, R; Bourillet, Jean-francois; Baltzer, Agness; Bourquin, S; Dennielou, Bernard; Coutelle, Alain; Weber, N; Floch, Gilbert.
During the SEDIFAN 1 cruise we surveyed the bathymetry and the acoustic properties of the surface sediment of the Celtic Deep Sea Fan. We also collected Kullenberg cores in order to study recent sedimentary processes. From the bathymetry survey it is relatively easy to recognize the main areas of modern fan. The upper fan included a large sedimentary ridge which constitutes the right levee of the prominent meandering Whittard valley. After its confluence with the Shamrock valley the course of the Whittard valley is abruptly deflected to the south. At a short distance to the south the valley divides into two upper-fan channels, the Celtic channel to the west being the deeper one. This point constitutes the centre of a radiating pattern which is developed on...
Tipo: Text
Palavras-chave: Paléoclimat; Turbidité; Sédiment; Quaternaire; Eventail profond; Palaeoclimate; Turbidity; Sediment; Quaternary; Deep sea fan.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-525.pdf

Etude Sédimentaire Appliquée à l'Aquaculture pour Cinq Estrans de Bretagne Sud (Morbihan et Loire Atlantique).
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
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

Helium transport in sediment pore fluids of the Congo-Angola margin
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chaduteau, Carine; Jean-baptiste, Philippe; Fourre, Elise; Charlou, Jean-luc; Donval, Jean-pierre.
During the ZaiRov2 cruise of the ZaiAngo project (1998-2000) on the passive Congo-Angola margin, several gravity cores were analyzed for helium isotopic composition of sedimentary pore waters in two cold fluid seepage zones: the Astrid slide area and the Regab giant pockmark. Gas concentration and isotopic composition are presented along with thermal data in terms of the origin and circulation of fluids. Helium isotope data lie on a mixing line between bottom seawater and an almost pure radiogenic. Helium and temperature vertical profiles are well described by the classic diffusion-advection equation. On the basis of He profiles, we estimate the advection rate on the rim of the pockmark between 1.2 and 2.3 mm/a. The He flux derived for a pure diffusive...
Tipo: Text
Palavras-chave: Zaire Angola margin; Sediment; Regab; Pore fluids; Pockmark; Helium.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6112.pdf

Accumulation des sels nutritifs dans un sédiment lagunaire et environnement hydrodynamique
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gomez, E; Millet, B; Picot, B.
The Mejean-Perols Lagoon is situated on the French Mediterranean coast. It is a small (747 ha) and shallow (70 cm) lagoon. Some treated effluent from Montpellier flows into this hypereutrophic lagoon. The cartography of C, N and P concentrations in the sediment was studied based on 35 bottom samples. The nitrogen and organic carbon concentrations were more or less homogeneous, the highest concentrations being found in the middle of the lagoon. The phosphate was principally bound onto the sediment in the west zone. The observed distribution was independent of grain size, the distribution of which was rather homogeneous. In this lagoon water circulation is wind induced. Four different water flow structures were observed, as functions of the prevailing winds...
Tipo: Text
Palavras-chave: Sédiment; Lagune côtière; Hydrodynamique; Sels nutritifs; Carbone; Sediment; Coastal lagoon; Hydrodynamics; Nutrients; Carbon.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43642/43247.pdf

Satellite-derived parameters for biological modelling in coastal waters: Illustration over the eastern continental shelf of the Bay of Biscay
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gohin, Francis; Loyer, S; Lunven, Michel; Labry, Claire; Froidefond, J; Delmas, Daniel; Huret, Martin; Herbland, Alain.
In biological modelling of the coastal phytoplankton dynamics, the light attenuation coefficient is often expressed as a function of the concentrations of chlorophyll and mineral suspended particulate matter (SPM). In order to estimate the relationship between these parameters over the continental shelf of the northern Bay of Biscay, a set of in situ data has been gathered for the period 1998-2003 when SeaWiFS imagery is available. These data comprise surface measurements of the concentrations of total SPM, chlorophyll, and irradiance profiles from which is derived the attenuation coefficient of the photosynthetically available radiation, K-PAR. The performance of the IFREMER look-up table used to retrieve the chlorophyll concentration from the SeaWiFS...
Tipo: Text
Palavras-chave: Bay of Biscay; SeaWiFS; Sediment; Chlorophyll; Ocean color.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1172.pdf

Retrospective study of metal contamination time trends in the French part of the Bay of Biscay
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Boutier, Bernard; Quintin, Jean-yves; Rozuel, Emmanuelle; Auger, Dominique; Bretaudeau-sanjuan, Jane.
Two cores were sampled in the Bay of Biscay: one a few miles off the Gironde estuary (pointe de la Coubre), the other near the Spanish border (Capbreton canyon) to study past variations in sediment contamination. Radiochronology (210Pb, 137Cs) and total metal determinations by ICP-MS allowed the study of time trends for metal concentrations in sediment. Off the Gironde, during the time interval recorded by the core (1958–1999), all metal concentrations remained less than OSPAR background values. Some variations occurred along the Cd and Zn profiles, which may correspond to a very attenuated signal from the Gironde outputs. This suggests that this area was not submitted to any significant anthropogenic input of metals between 1958 and 1999. In the canyon of...
Tipo: Text
Palavras-chave: Sediment; Metal contamination; Dating; Cores; Time trends.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00061/17254/16094.pdf

Etat de la pollution par les hydrocarbures dans l'Aber Benoit
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Allen, G.; D'Ozouville, Laurent; L'Yavanc, Jacky.
The Aber Benoît, a small estuary on the North West coast of Brittany was polluted by oil from the Amoco Cadiz oil spill. Preliminary results from water and sediment samples taken in the estuary in May 1978, show that two months after the initial spill, high concentrations of hydrocarbures existed in the water and sediments of the estuary. The Aber Benoît shows a well developed salt wedge and upstream increasing suspended sediment concentrations. Oil was dispersed more or less evenly throughout the water column, in the entire length of the estuary. In the bottom sediments, oil had accumulated to depths of 30 cm. Sand bars appear to induce a trapping of oil in the estuary channel.
Tipo: Text
Palavras-chave: Estuaire; Sédiment; Pollution Hydrocarbures; Estuary; Sediment; Oil spill.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/00306/41721/40932.pdf

Levels and trends of brominated flame retardants in the European environment
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Law, Robin J.; Allchin, Colin R; De Boer, Jacob; Covaci, Adrian; Herzke, Dorte; Lepom, Peter; Morris, Steven; Tronczynski, Jacek; De Wit, Cynthia A.
In this paper, we review those data which have recently become available for brominated flame retardants (particularly the brominated diphenyl ethers (BDEs) and hexabromocyclododecane (HBCD)) in samples from the European environment. Environmental compartments studied comprise the atmosphere, sediments and soils. sewage sludges. and a variety of biological samples and food chains. This is currently a very active research area, and we cite over 70 studies reported in the literature during 2003-04. Findings include that the input of BDEs (especially BDE209) to the Baltic Sea by atmospheric deposition now exceeds that of PCBs by a factor of almost 40 times. Sewage sludge samples from both industrial and background locations show concentrations of BDEs. HBCD...
Tipo: Text
Palavras-chave: Biota; Sewage sludge; Soil; Sediment; Atmosphere; Europe; Tetrabromobisphenol A; Hexabromocyclododecane; Polybrominated diphenyl ethers; Brominated flame retardants.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1685.pdf

The biogeochemistry of mercury at the sediment water interface in the Thau lagoon. 1. Partition and speciation
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Muresan Paslaru, Bogdan; Cossa, Daniel; Jezequel, D; Prevot, F; Kerbellec, S.
Solid sediment, pore and epibenthic waters were collected from the Thau lagoon (France) in order to study the post depositional partition and mobility of mercury and monomethylmercury in an organic rich sediment. Total Hg (HgT) and monomethymercury (MMHg) profiles were produced in both dissolved and solid phases. The distribution of HgT in the solid appeared to be related to the historical changes in the Hg inputs into the lagoon. HgT was in equilibrium between solid and solution in the sulfidic part of the cores, with a mean log Kd of 4.9 +- 0.2. The solid appeared to be a source of HgT for pore water in the upper oxic to suboxic parts of the cores. The MMHg represented a small fraction of HgT: 3-15 % and 0.02-0.80 % in the dissolved and in the solid...
Tipo: Text
Palavras-chave: Fluxes; Partition; Sediment; Lagoon; Methylmercury; Mercury.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2006/publication-2083.pdf

Spatio-temporal variability in benthic silica cycling in two macrotidal estuaries: Causes and consequences for local to global studies
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Raimonet, Melanie; Ragueneau, Olivier; Andrieux Loyer, Francoise; Philippon, Xavier; Kerouel, Roger; Le Goff, Manon; Memery, Laurent.
The high heterogeneity of silica cycling in coastal margins and the lack of silica data (compared to nitrogen and phosphorus) prevent the estimation of global silica retention in estuaries. In this study, the spatial and temporal variability of porewater silicic acid (Si(OH)4) profiles e that integrate benthic transport and reaction processes e was investigated at different spatial (metre, longitudinal and crosssection, intra-estuary) and temporal (tidal, seasonal) scales in two macrotidal estuaries, very close geographically but essentially differing in their shape. Studying the spatial and temporal variability of Si(OH)4 concentrations in porewaters provided evidence for the importance of transport processes, e.g. bio-irrigation, tidal pumping,...
Tipo: Text
Palavras-chave: Heterogeneity; Season; Silicate; Sediment; Land-sea interface; Upscaling.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00124/23529/22370.pdf

Rejets urbains. Volet Manche - Atlantique - Site de Morlaix - Etudes sédimentologique et Bathymétrique de l' estuaire de Morlaix
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bassoullet, Philippe; L'Yavanc, Jacky; Guillaud, Jean-francois; Loarer, Ronan; Breton, Marguerite.
In order to increase our knowledge about sediment transport in the bay and maritime part of the River of Morlaix (Finistère), measurernènts have been perforrned on site. This report gives the granulometrical and physical parameters of the sediments as weIl as the hydrodynamics, used for a model of particulate transport in the area. The rnodel and its application will be published later
Tipo: Text
Palavras-chave: Rejet urbain; Sédiment; Granulométrie; Hydrodynamique; Modèle de transport particulaire; Sable; Vase; Estuaire de Morlaix.; Urban wastes; Model; Sediment; Granulometry; Hydrodynamics; Sand; Mud; Sedimentary transport model; Morlaix estuary.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00345/45658/45293.pdf

Le logmètre : un nouvel outil de saisie des descriptions de carottes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Savoye, Bruno; Floch, Gilbert; Kerbrat, Rene; Apprioual, Ronan.
Core description is used extensively by sedimentologists to yield critical information from sediments. It consists of a naturalistic description of the visual and textural characteristics of the sediment. It is generally a manual procedure. However, digital core descriptions are now required re manage data processing. Hand-written description can be keyed into a computer, but it is tedious and time consuming. Moreover, recording and typing errors can occur. A system is presented for digital description of sediment cores using a bar code principle. It can be used in the laboratory as well as on board vessels. It comprises a box inside which the half-core can be placed. A ruler and several sets of bar codes are printed on the inside box top. Bar codes are...
Tipo: Text
Palavras-chave: Traitement informatique; Outil; Sédiment; Codes barres; Carotte; Software processing; Measuring board; Sediment; Bar codes; Core.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/publication-838.pdf

Consequences of radioactive releases into the sea resulting from the accident at the Fukushima Dai-ichi nuclear power plant - Evolution of expert investigation according to the data available
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Laguionie, Philippe; Bailly-du-bois, Pascal; Boust, D.; Fievet, B.; Garreau, Pierre; Connan, O.; Charmasson, Sabine; Arnaud, M.; Duffa, Celine; Champion, D.
The accident at the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in March 2011 led to an unprecedented direct input of artificial radioactivity into the marine environment. The Institute for Radioprotection and Nuclear Safety was requested by the French authorities to investigate the radioecological impact of this input, in particular the potential contamination of products of marine origin used for human consumption. This article describes the close link between the responses provided and the availability of the data, as well as their nature and ability to meet the requirements of expert investigation. These responses were needed: (i) to evaluate the inputs of radionuclides into the marine environment, (ii) to understand their dispersion in seawater,...
Tipo: Text
Palavras-chave: Nuclear power plant; Accident analysis; Seawater; Sediment; Biota.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00096/20690/18353.pdf

Comparison of microbial communities associated with three Atlantic ultramafic hydrothermal systems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Roussel, Erwan; Konn, Cecile; Charlou, Jean-luc; Donval, Jean-pierre; Fouquet, Yves; Querellou, Joel; Prieur, Daniel; Cambon-bonavita, Marie-anne.
The distribution of Archaea and methanogenic, methanotrophic and sulfate-reducing communities in three Atlantic ultramafic-hosted hydrothermal systems (Rainbow, Ashadze, Lost City) was compared using 16S rRNA gene and functional gene (mcrA, pmoA and dsrA) clone libraries. The overall archaeal community was diverse and heterogeneously distributed between the hydrothermal sites and the types of samples analyzed (seawater, hydrothermal fluid, chimney and sediment). The Lost City hydrothermal field, characterized by high alkaline warm fluids (pH&gt;11; T&lt;95 °C), harbored a singular archaeal diversity mostly composed of unaffiliated Methanosarcinales. The archaeal communities associated with the recently discovered Ashadze 1 site, one of the deepest active...
Tipo: Text
Palavras-chave: Archaea; Hydrothermal vent; Mid-Atlantic Ridge; 16S rRNA gene; Sediment; Ultramafic.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00067/17836/15573.pdf

Réseau de surveillance benthique – Région Bretagne. Approche sectorielle subtidale : Identification et caractérisation des habitats benthiques du secteur Trégor-Goëlo
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ehrhold, Axel; Chevalier, Claire; Alix, Anne-sophie; Autret, Elodie; Caisey, Xavier; Drussel, Benjamin; Gaffet, Jean-dominique; Hamon, Dominique; Houlgatte, Eric; Pluquet, Fabrice; Biscara, Laurie; Choisnet, Justine; Bajjouk, Touria.
In 2000 Ifremer launched and coordinated the development of a monitoring strategy for the REBENT network (REseau BENThique) in order to assess the aftermath of the “Erika” oil spill which took place in December 1999. Its aim is to provide consistent baseline knowledge on coastal benthic habitats, as well as to develop a monitoring tool that detects changes at various spatial and temporal scales. Sector-based seabed habitat mapping in shallow water (&lt; 50 m deep), is currently being conducted throughout Brittany's coastal waters using a combination of geoacoustic marine systems together with ground-truthing using biological grab sampling and seabed observations.  Due to the extended area, the overlap of soft and rocky bottoms, and contrasting hydrological...
Tipo: Text
Palavras-chave: Rebent; Trégor-Goëlo; Bréhat; Cartographie d’habitats; Sonar latéral; Macrofaune benthique; Peuplements; Crépidule; Maërl; Sédiments; Morphologie; Dynamique sédimentaire; Rebent; Trégor-Goëlo; Bréhat archipelago; Marine habitat mapping; Sidescan sonar; Benthic macrofauna; Communities; Crepidula bed; Maerl; Sediment; Morphology; Bedload transpor.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00280/39161/37724.pdf

Change in the structure of Escherichia coli population and the pattern of virulence genes along a rural aquatic continuum
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Petit, Fabienne; Clermont, Olivier; Delannoy, Sabine; Servais, Pierre; Gourmelon, Michele; Fach, Patrick; Oberle, Kenny; Fournier, Matthieu; Denamur, Erick; Berthe, Thierry.
The aim of this study was to investigate the diversity of the E. coli population, focusing on the occurrence of pathogenic E. coli, in surface water draining a rural catchment. Two sampling campaigns were carried out in similar hydrological conditions (wet period, low flow) along a river continuum, characterized by two opposite density gradients of animals (cattle and wild animals) and human populations. While the abundance of E. coli slightly increased along the river continuum, the abundance of both human and ruminant-associated Bacteroidales markers, as well as the number of E. coli multi-resistant to antibiotics, evidenced a fecal contamination originating from animals at upstream rural sites, and from humans at downstream urban sites. A strong spatial...
Tipo: Text
Palavras-chave: Water; Sediment; Pathogenic E. coli; Virulence gene; Shiga toxin.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00378/48887/49328.pdf

Ba distribution in surface Southern Ocean sediments and export production estimates
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Fagel, N; Dehairs, F; Andre, L; Bareille, G; Monnin, C.
We present excess Ba (Baxs) data (i.e., total Ba corrected for lithogenic Ba) for surface sediments from a north-south transect between the Polar Front Zone and the northern Weddell Gyre in the Atlantic sector and between the Polar Front Zone and the Antarctic continent in the Indian sector. Focus is on two different processes that affect excess Ba accumulation in the sediments: sediment redistribution and excess Ba dissolution. The effect of these processes needs to be corrected for in order to convert accumulation rate into vertical rain rate, the flux component that can be linked to export production. In the Southern Ocean a major process affecting Ba accumulation rate is sediment focusing, which is corrected for using excess (230)Th. This correction,...
Tipo: Text
Palavras-chave: Excess Ba; Sediment; Southern Ocean; Export production.
Ano: 2002
URL: https://archimer.ifremer.fr/doc/00223/33392/31868.pdf

Suivi des coques du Croisic en 1998. Bilan synthétique.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Fleury, Pierre-gildas; Langlade, Aime; Le Coguic, Marie-jo; Thebault, Anne; Chellet, B.; Ponthoreau, C.; Devulder, G.
Suite aux mortalités massives de coques apparues au Croisic en août 1997, des études ont été mises en place en 1998, avec une coordination des travaux des différents laboratoires impliqués: suivi de la température et de la matière organique dans le sédiment, suivi des animaux et observation des parasites. Les principaux résultats sont:  - l'enregistrement de brusques amplitudes thermiques dans le sédiment;  - des taux anormalement élevés de matière organique dans le sédiment (20 à 40%) à l'automne 1997, puis des taux plus habituels (&lt;2%) après les tempêtes de l'hiver 1997-98 ; - un affaiblissement important de la vitalité musculaire des animaux en juillet;  - une infestation relativement faible en trématodes virulents (Labratrema minimus), mais dont les...
Tipo: Text
Palavras-chave: Coques; Cerastoderma edule; Le Croisic; Sédiment; Elevage; Mortalité; Croissance; Vitalité; Maturation; Pathologie; Cockles; Cerastoderma edule; Le Croisic (France); Sediment; Rearing; Mortallty; Growlh; Vitality; Maturation; Pathology.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00107/21848/19435.pdf

Microplastics baseline surveys at the water surface and in sediments of the North-East Atlantic
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Maes, Thomas; Van Der Meulen, Myra D; Devriese, Lisa L.; Leslie, Heather A.; Huvet, Arnaud; Frere, Laura; Robbens, Johan; Vethaak, Dick A.
Microplastic contamination was determined in sediments of the Southern North Sea and floating at the sea surface of North West Europe. Floating concentrations ranged between zero and 1.5 microplastic/m3, whereas microplastic concentrations in sediments ranged between zero and 3146 particles/kg dry weight sediment. In sediments, mainly fibers and spheres were found, whereas at the sea surface fragments were dominant. At the sea surface, concentrations of microplastics are lower and more variable than in sediments, meaning that larger sample sizes and water volumes are required to find detectable concentrations. We have calculated the widths of the confidence intervals (CI) for different sample sizes, to give a first indication of the necessary sample size...
Tipo: Text
Palavras-chave: Microplastics; Marine litter; Floating debris; Sediment; Marine Strategy Framework Directive (MSFD); Baseline.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00384/49505/49999.pdf

Water column and recent sediment data on diatoms and coccolithophorids, off Portugal, confirm sediment record of upwelling events
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Abrantes, F; Moita, Mt.
Diatom and coccolithophorid abundance and diatom assemblage composition found in the water column along the Portuguese margin, during upwelling and non-upwelling conditions, are compared to the distribution patterns observed in the recent sediments from the same area. The water column results indicate a one order of magnitude increase in phytoplankton biomass during upwelling conditions (summer). with diatoms being the most important contributors. Coccolithophorids, on the contrary, dominate the phytoplankton in winter (non-upwelling). The comparison of the upwelling and non-upwelling spatial distribution of these phytoplankton groups to their sedimentary record reveals the sediment record as a reflection of the upwelling situation, preserving most of its...
Tipo: Text
Palavras-chave: Upwelling; Portugal; Diatomée; Colonne d’eau; Sédiment; Upwelling; Portugal; Diatom; Water column; Sediment.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43613/43915.pdf

Rare earth elements and neodymium isotopes in sedimentary organic matter
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Freslon, Nicolas; Bayon, Germain; Toucanne, Samuel; Bermell, Sylvain; Bollinger, Claire; Chéron, Sandrine; Etoubleau, Joel; Germain, Yoan; Khripounoff, Alexis; Ponzevera, Emmanuel; Rouget, Marie Laure.
We report rare earth element (REE) and neodymium (Nd) isotope data for the organic fraction of sediments collected from various depositional environments, i.e. rivers (n=25), estuaries (n=18), open-ocean settings (n=15), and cold seeps (n=12). Sedimentary Organic Matter (SOM) was extracted using a mixed hydrogen peroxide/nitric acid solution (20%-H2O2 – 0.02M-HNO3), after removal of carbonate and oxy-hydroxide phases with dilute hydrochloric acid (0.25M-HCl). A series of experimental tests indicate that extraction of sedimentary organic compounds using H202 may be complicated occasionally by partial dissolution of sulphide minerals and residual carbonates. However, this contamination is expected to be minor for REE because measured concentrations in H2O2...
Tipo: Text
Palavras-chave: Organic matter; Rare earth elements; REE; Neodymium isotopes; ΕNd; Sediment; Boundary Exchange; Paleoceanography.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00191/30250/28682.pdf

Improvements in Digestion Protocols for Trace Element and Isotope Determinations in Stream and Lake Sediment Reference Materials (JSd-1, JSd-2, JSd-3, JLk-1 and LKSD-1)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Revillon, Sidonie; Hureau Mazaudier, Daniele.
Total dissolution is a critical step in geochemical analysis. Despite the number of published protocols, this issue still draws attention for sediment samples, which are particularly difficult to dissolve due to the common occurrence and high abundance of refractory phases such as zircon. We present tests of different chemical digestion procedures carried out on reference materials (RM) of stream (JSd-1, JSd-2 and JSd-3) and lake (JLk-1 and LKSD-1) sediments from the Geological Survey of Japan (GSJ) and the Canadian Certified Reference Material Programme (CCRPM). We demonstrate that the fusion technique is not appropriate for our studies as not all elements of interest were recovered and blank levels were too high to permit further Sr and Pb isotopic...
Tipo: Text
Palavras-chave: Sediments; Fusion; Dissolution acide; HR ICP MS; Materiel de reference; Sediment; Fusion; Acid digestion; HR ICP MS; RM; Sédiments; Fusion; Dissolution acide; HR ICP MS; Matériel de référence.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6840.pdf

Clay mineral evolution in the central Okinawa Trough since 28 ka: Implications for sediment provenance and paleoenvironmental change
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Dou, Yanguang; Yang, Shouye; Liu, Zhenxia; Clift, Peter D.; Yu, Hua; Berne, Serge; Shi, Xuefa.
The Okinawa Trough is a natural laboratory for the study of later Quaternary land-ocean interaction and paleoenvironmental changes. In this study we reconstruct the evolution of clay mineral assemblages in Core DGKS9604 retrieved from the central Okinawa Trough. Illite dominates the clay mineral compositions, with average contents above 60%. Clay mineral evolution since 28 ka is closely related to changes in sediment provenance and paleoenvironment. Sea level rise and the strength of the Kuroshio Current control the dispersal and deposition of clays on the East China Sea shelf and in the Okinawa Trough, and thus, determine the clay mineral compositions in the core sediments. During the late last glacial period (28.0-14.0 ka), the paleo-Changjiang River...
Tipo: Text
Palavras-chave: Clay mineral; Sediment; Provenance; East China Sea; Okinawa Trough.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00002/11367/7977.pdf

Variations à différentes échelles spatiales de l'herbier à Posidonia oceanica (L.) Delile ; effets sur les paramètres physico-chimiques du sédiment
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gobert, S; Kyramarios, M; Lepoint, G; Pergent-martini, C; Bouquegneau, Jm.
The biometric parameters (shoot density, length and width of leaves, leaf and epiphyte biomasses, leaf surface) of the P. oceanica meadow present a significant spatial variability at the mesoscale level (100m(2)). All the parameters studied, excepting the number of leaves, decrease according to the depth. The horizontal spatial variations (centrifuge and centripetal distributions) reach a maximum in the shallower areas. The analysis of the microstructures (m(2)) of the meadow has not allowed a relationship to be established between the spatial variations of the biometric parameters and the environmental factors in the sediment (pH, water and organic matter content, red-ox potential, nutrient content). The heterogeneity of the meadow in the Revellata Bay...
Tipo: Text
Palavras-chave: Posidonia oceanica; Distribution spatiale; Biomasse; Sédiment; Phanérogame; Méditerranée; Posidonia oceanica; Spatial distribution; Biomass; Sediment; Seagrass; Mediterranean Sea.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43277/43009.pdf

Environmental stress in the pacific oyster Crassostrea gigas during gametogenesis : role of herbicides?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Burgeot, Thierry; Quirion, Sophie; Quiniou, Francoise; Knoery, Joel; Soletchnik, Patrick; Gagnaire, Beatrice; Renault, Tristan; Osada, M.; Geret, F.; Communal, P. Y.; Jadas-hecart, A.; Gagne, F.
In the Atlantic French coast, significant mortalities were observed in oyster communities during gametogenesis. These deaths possibly result from the cumulative effects of various stressors such as seasonal temperature variations, pesticide application and the release of contaminants from the resuspension of sediments. A field survey, based on aquaculture conditions at 15 and 70 cm from the sediment bed with genetically-resistant (R) and -sensitive (S) lines, showed a stress condition. Significant weight loss was observed during May 14th through June 10th for both R and S lines. On one hand, the levels of the egg yolk vitellin in females were decreased at May 14th for both R and S lines.  On the other hand, a significant increase in vitellin production was...
Tipo: Text
Palavras-chave: Mortalities; Herbicides; Sediment; Biomarkers; Gametogenesis; Crassostrea gigas; Pacific oysters.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/acte-3384.pdf

The influence of sediment cohesiveness on bioturbation effects due to Hydrobia ulvae on the initial erosion of intertidal sediments: A study combining flume and model approaches
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Orvain, F; Sauriau, Pierre-guy; Bacher, Cedric; Prineau, Michel.
Laboratory experiments performed in a recirculating flume were designed to quantify the bioturbation influence of the mud snail Hydrobia ulvae, one of the most abundant deposit feeders on European intertidal mudflats. Variations in sediment moisture content that occur between bedforms in shore-normal, ridge and runnel systems of intertidal mudflats were added to the model definition. Sediment erosion thresholds, erosion rates and the microalgal pigment composition of resuspended material were quantified for different H. ulvae densities (0, 1000, 5000, 10 000 and 50 000 snails m(-2)) and applied bed shear stresses. Two different sediment moisture contents were tested. In the absence of macrofauna, recorded turbidities increased up to the maximum applied...
Tipo: Text
Palavras-chave: Model; Flume; Chloropigments; Ridges and tunnels; Mudflat; Sediment; Hydrobia ulvae; Bioturbation; Resuspension.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3774.pdf

Eléments azotés de la colonne d'eau et de l'interface eau-sédiment du bassin de Marennes-Oléron : influence des cultures d'huîtres
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Feuillet-girard, Michelle; Heral, Maurice; Sornin, Jean-marc; Deslous-paoli, Jean-marc; Robert, Jean-michel; Mornet, Francoise; Razet, Daniel.
The respective influences of the sediment and of oyster (Crassostrea gigas) farming on the accumulation and the recycling of different forms of organic and inorganic nitrogen are described. Fluxes of dissolved inorganic and organic forms of nitrogen were studied between the water column, the water overlying the sediment and the pore waters, while for particulate forms the fluxes were studied between suspended material, the "biodeposits" (faeces and pseudofaeces of Crassostrea) and the sediment. The flux of inorganic nitrogen amounts to 10.5 106 g.m(-2). Yr(-1), while that of organic nitrogen is half this figure. The particulate flux is 15.106 g.m(-2).yr(-1). On the other hand, the phytoplanktonic nitrogen accounts for only 6% of the total particulate...
Tipo: Text
Palavras-chave: Marenne Oleron; Sediment; Pore water; Interface; Crassostrea gigas; Nitrogen; Marennes Oléron; Sédiment; Eau interstitielle; Adsorption; Interface; Crassostrea gigas; Azote.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/publication-2878.pdf

Contribution of resuspended sedimentary particles to dissolved iron and manganese in the ocean: An experimental study
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cheize, Marie; Planquette, H.f.; Fitzsimmons, J.n.; Pelleter, Ewan; Sherrell, R.m.; Lambert, Christophe; Bucciarelli, E.; Sarthou, G.; Le Goff, Marion; Liorzou, Celine; Chéron, Sandrine; Viollier, E.; Gayet, Nicolas.
A number of trace metals play essential roles in marine ecosystem structure and biological productivity. Until recently, it has been argued that phytoplankton access primarily dissolved iron, while particulate iron was considered a refractory material with little use biologically and limited interaction with the dissolved pool. In order to assess the transfer mechanisms between sediment-sourced particulate trace metals and the dissolved pool, we conducted a 14-month incubation that reacted resuspended sediments with natural seawater, both originating from the Kerguelen area (KEOPS cruises; Southern Ocean), in the dark, and at concentrations replicating natural conditions. Three types of sediments were investigated (named BioSi, BioSi + Ca, and Basalt),...
Tipo: Text
Palavras-chave: Suspended particle dissolution; Sediment; Iron; Manganese; Biogenic silica; Southern Ocean; Kerguelen.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00460/57197/59166.pdf

Microplastics in sediments: A review of techniques, occurrence and effects
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Van Cauwenberghe, Lisbeth; Devriese, Lisa; Galgani, Francois; Robbens, Johan; Janssen, Colin R.
Microplastics are omnipresent in the marine environment and sediments are hypothesized to be major sinks of these plastics. Here, over 100 articles spanning the last 50 year are reviewed with following objectives: (i) to evaluate current microplastic extraction techniques, (ii) to discuss the occurrence and worldwide distribution of microplastics in sediments, and (iii) to make a comprehensive assessment of the possible adverse effects of this type of pollution to marine organisms. Based on this review we propose future research needs and conclude that there is a clear need for a standardized techniques, unified reporting units and more realistic effect assessments.
Tipo: Text
Palavras-chave: Microplastics; Pellets; Sediment; Techniques; Direct effects; Indirect effects.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00270/38157/36291.pdf

Aggregated and Validated Datasets for the European Seas: The Contribution of EMODnet Chemistry
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Giorgetti, Alessandra; Lipizer, Marina; Molina Jack, Maria Eugenia; Holdsworth, Neil; Jensen, Hans Mose; Buga, Luminita; Sarbu, George; Iona, Athanasia; Gatti, Julie; Larsen, Martin; Fyrberg, Lotta; Østrem, Ann Kristin; Schlitzer, Reiner.
Tipo: Text
Palavras-chave: Nutrients; Oxygen; Acidity; Contaminants; Sediment; Biota; Aggregated datasets.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00663/77519/79314.pdf

Acquisition of detrital magnetization in four turbidites
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Tanty, Cyrielle; Valet, Jean-pierre; Carlut, Julie; Bassinot, Franck; Zaragosi, Sebastien.
Turbiditic events are mostly avoided in paleomagnetic studies and therefore their remanence and magnetic properties are poorly described. Turbidites are exempt of bioturbation and potentially provide pertinent information about depositional remanence. We studied four quaternary turbidites of different origins in marine sediment cores. Upward fining of both magnetic and sedimentary fractions indicates that coarser grains reached the bottom first. We observe a progressive shallowing of the magnetic inclinations between the upper and bottom layers of the turbidites that increases with the size of the events and obeys a simple linear scaling law. Measurements of magnetic anisotropy suggest that hydrodynamic conditions prevailing during deposition seem to be...
Tipo: Text
Palavras-chave: Detrital remanence; Turbidite; Sediment; Rock magnetism; Magnetization.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00421/53226/54792.pdf

(CS)-C-137 inventory in sediment near the Rhone mouth: role played by different sources
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Charmasson, S.
The low tidal range of the Mediterranean Sea and the high sediment load of the Rhone induce the formation of an important submarine delta. The Cs-137 inventory in sediment on a 480 km(2) area near the Rhone mouth reached 19.6 TBq in 1990. The spatial distribution of both sediment accumulation rates and (CS)-C-137 concentrations in this area confirm the existence of a spatially well-delimited zone, i.e. the prodelta, where both parameters are the highest. Thus, 40% of the total amount of Cs-137 stored in this 480 km(2) area was found within the prodelta (30 km(2)) in the close vicinity of the river mouth. This attests to the efficiency of the (CS)-C-137 trapping by the prodelta sediments. A study on the part the different (CS)-C-137 sources in the...
Tipo: Text
Palavras-chave: Rhône; Méditerranée; Radioéléments; Sédiment; Inventaire; Rhone; Mediterranean Sea; Radionuclides; Sediment; Inventory.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43266/42997.pdf

Origin and Accumulation of Trace Elements in Sediments of the Northwestern Mediterranean Margin
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cossa, Daniel; Buscail, R.; Puig, P.; Chiffoleau, Jean-francois; Radakovitch, Olivier; Jeanty, G.; Heussner, S.
Continental margins receive natural and anthropogenic trace elements (TEs) from direct atmospheric deposition of aerosols onto the sea surface and from advection of riverine suspended particles and/or resuspended sediments from the continental shelf/slope. When the margin is incised by submarine canyons, as for example in the Northwestern Mediterranean Sea, most of these particles are preferentially transferred via these topographic features towards their final repositories in the abyssal plain. The Gulf of Lions (GoL) shelf receives the largest particulate riverine input to the Western Mediterranean, with its associated chemical contaminants originating from the industrialized and urbanized Rhone Valley. Sediments samples (grabs, cores and moored traps)...
Tipo: Text
Palavras-chave: Trace-element; Sediment; Canyon; Continental margin; Mediterranean.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29971/28424.pdf

Modélisation des flux sédimentaires charriés dans la baie du Mont-Saint-Michel (Manche, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ehrhold, Axel; Guillou, Sylvain; Auffret, J; Garlan, T; Nguyen, K.
A study of the sediment bedload in the Mont-Saint-Michel bay is presented here. It combines the use of a 2DH numerical model and a pattern of sediment bedload transport established on the analysis of the statements of sidescan imagery combined with a dense groundwork of sedimentary grab samples. Results show the role of tidal currents asymetry in the realistic bioclastic sand transfert from the subtidal environment to the coast and the divergence of sedimentary dynamic between the maritime bay to the West and the tidal delta to the East. This in-shore transfer is responsable of the Holocene prism construction. The model reproduces tidal sedimentary dynamics with the immediate surroundings of the Mont-Saint-Michel. It shows the interest of the modeling of...
Tipo: Text
Palavras-chave: Mont Saint Michel bay; Sediment; Sidescan; Bedload transport; Hydrodynamic model; Baie du Mont Saint Miche; Sédiment; Sonar latéral; Débit massique; Modèle hydrodynamique.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-522.pdf

Circulation and suspended sediment transport in a coral reef lagoon: The south-west lagoon of New Caledonia
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ouillon, S.; Douillet, Pascal; Lefebvre, J. P.; Le Gendre, Romain; Jouon, Aymeric; Bonneton, P.; Fernandez,; Chevillon, C.; Magand, O.; Lefevre, J.; Le Hir, Pierre; Laganier, R.; Dumas, Franck; Marchesiello, P.; Madani, A. Bel; Andrefouet, S.; Panche, J. Y.; Fichez, R.
The south-west lagoon of New Caledonia is a wide semi-open coral reef lagoon bounded by an intertidal barrier reef and bisected by numerous deep inlets. This paper synthesizes findings from the 2000-2008 French National Program EC2CO-PNEC relative to the circulation and the transport of suspended particles in this lagoon. Numerical model development (hydrodynamic, fine suspended sediment transport, wind-wave, small-scale atmospheric circulation) allowed the determination of circulation patterns in the lagoon and the charting of residence time, the later of which has been recently used in a series of ecological studies. Topical studies based on field measurements permitted the parameterisation of wave set-up induced by the swell breaking on the reef barrier...
Tipo: Text
Palavras-chave: Hydrodynamics; Suspended sediment; New Caledonia; Coral reef lagoon; Sediment; Turbidity; Resuspension.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00014/12526/9401.pdf

Impact de la salmoniculture marine sur l'environnement en rade de Cherbourg (1993-1995) 2. étude biosédimentaire
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Kempf, Marc; Cadour, Gwenael; Jeanneret, Hélène; Mear, Yan; Miramand, Pierre; Merceron, Michel.
This document is a result of an environmental impact study carried out between 1993 and 1995 on the site of a marine trout culture located in the Harbour of Cherbourg, France. It deals with the solid waste of the farm and concems deposition rate, sediment analysis and chemistry (fine fraction &lt; 63 ~m, organic matter, carbon, nitrogen, copper and zinc), bottom living organisms and underwater video monitoring. The impact observed is very moderate and localised. This is mainly due to the strong d)'TIamics and flushing rate of the site. A seperate volume of the same study deals with dissolved waste and concems the water mass (volume 1 : water and pelagos). (Not controlled OCR)
Tipo: Text
Palavras-chave: Rade de Cherbourg; Étude biosédimentaire; Impact; Salmoniculture marine; France; Cherbourg; Benthos; Sediment; Environmental impact; Trout; Marine fish farming.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-3349.pdf

Impact des installations ostréicoles sur l’hydrodynamique et la dynamique sédimentaire
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Kervella, Youen.
Oyster farm structures represent artificial obstacles which can disturb tidal currents and wave propagation, and thus modify sediment transport patterns. Local deposition may result from these modifications, in proportions that may threaten the oyster farming. The impact of structures on hydrodynamics, waves and currents, is investigated at different spatial scales by means of in-situ measurements, experimental tests and numerical modeling. These different approaches show that in the near-field, tidal currents are modified in terms of intensity and direction but there is no significant impact on the waves. On the other hand, at the scale of the oyster farm, a significant reduction of the current velocities and a large wave height attenuation are recorded....
Tipo: Text
Palavras-chave: Tables à huîtres; Envasement; Courants; Vagues; Sédiments; Impact; Oyster tables; Silting up; Currents; Waves; Sediment; Impact.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12262/9043.pdf

Changes in the sediment trace metal contamination after the commissioning of a municipal wastewater treatment plant in the Souss estuary (South Morocco)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Moukrim, A; Chiffoleau, Jean-francois; Cheggour, M; Burgeot, Thierry.
Monthly samples of sediment were collected from the Souss estuary, to determine the changes which have occurred in the concentrations of ten metals between 2001 when the low estuary was receiving the wastewaters from Agadir city and 2003 after stopping the sewage dumping. The annual contents of Cu, Fe, Zn (in 2001) and those of Cr, Cu, Fe, Mn, Ni, Pb, and Zn (in 2003) showed significant correlations with those of Al, indicating that fluctuations of their concentrations were only due to those of the aluminosilicate fraction of the clayey sediment. After normalization of these metallic concentrations in relation to those of Al, the contents of the different metals showed insignificant correlations between both years, except for Zn which significantly dropped...
Tipo: Text
Palavras-chave: Souss estuary; Wastewater; Sediment; Metal contamination.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-5923.pdf

Bacterivory by benthic organisms in sediment : Quantification using 15N-enriched bacteria
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pascal, P.y.; Dupuy, C; Mallet, C; Richard, P; Niquil, N.
The fate of benthic bacterial biomass in benthic food webs is a topic of major importance but poorly described. This paper describes an alternative method for evaluation of bacterial grazing rate by meiofauna and macrofauna using bacteria pre-enriched with stable isotopes. Natural bacteria from the sediment of an intertidal mudflat were cultured in a liquid medium enriched with 15NH4Cl. Cultured bacteria contained 2.9% of 15N and were enriched sufficiently to be used as tracers during grazing experiments. Cultured bacteria presented a biovolume (0.21 &amp;#956;m3) and a percentage of actively respiring bacteria (10%) similar to those found in natural communities. The number of Operational Taxon Units found in cultures fluctuated between 56 and 75% of that...
Tipo: Text
Palavras-chave: Tracer; Stable isotope; Sediment; Grazing; Bacteria.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4296.pdf

Modern sedimentation and geochemical imprints in sediments from the NW Madagascar margin
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pastor, Lucie; Brandily, Christophe; Schmidt, S.; Miramontes, E.; Péron, Maela; Appere, Dennis; Chéron, Sandrine; Boissier, Audrey; Jouet, Gwenael.
The NW Madagascar continental margin receives high loads of terrigenous particulate organic matter during the wet season and especially linked to extreme events, originating from two major rivers, the Betsiboka and the Mahavavy Rivers. This particulate matter contains a high content of iron minerals from the weathering of red ferruginous/ferralitic soils of Madagascar. The presence of pockmarks, i.e. gas or fluid expulsion features on the continental slope, testifies to past/present methane migration through the sedimentary column, associated with early diagenetic processes. This study globally aims at deciphering the interactions between episodic sedimentation and geochemical processes influenced by fluids upward migration, using a sediment trap mooring...
Tipo: Text
Palavras-chave: Episodic sedimentation; Madagascar margin; Betsiboka river; Mahavavy river; Progradation; Methane; Geochemistry; Sediment.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00628/73964/73323.pdf

Etude de la structure des communautés bactériennes du sédiment et de l'écologie de Vibrio aestuarianus pathogène de l'huître creuse Crassostrea gigas dans deux sites ostréicoles
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Azandegbe, Afi.
Since several years, the French oyster farming copes with high mortality affecting juveniles and some adults of the Pacific oyster Crassostrea gigas. Studies conducted in the framework of a multidisciplinary project (MOREST) showed that mortality was related to several factors like physiological and genetic status of oyster, pathogens including bacteria of the genus Vibrio, and revealed that the sediment, on which the oyster cages are installed, might play a particular role. This has been suggested because of the concomitance of the mortalities and increased toxic compounds like ammonia and sulphides in the sediment. Moreover, the presence of Vibrio bacteria in the sediment indicates a dual role of sediment in the mortality onset. The physico-chemical...
Tipo: Text
Palavras-chave: Huître; Crassostrea gigas; Bactéries; Vibrio aestuarianus; Écologie; Sédiment; Ammonium; Sulfures; Oyster; Crassostrea gigas; Bacteria; Vibrio aestuarianus; Ecology; Sediment; Ammonia; Sulphide.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00032/14277/11561.pdf

Etude sur les contaminants émergents dans les eaux françaises - Rapport de l'étude prospective sur les contaminants émergents dans les eaux littorales de la métropole et des DOM
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Abarnou, Alain; Bocquene, Gilles; Champin, Maryline; Durand, Gaetane; Gonzalez, Jean-louis; Le Moigne, Morgan; Masson, Jean-claude; Priou, Pierre; Tixier, Celine.
This study contributes to inventory programme on emerging pollutants in French waters and to the general reflection which will enable to update the list of relevant substnaces to be included in the new monitoring programmes to come. This work concerns the coastal part of the inventory programme on marine waters and sediments of France and five overseas french departments (OFD). In this goal, passive sampling techniques and direct extraction techniques have been tested through the implementation of in situ systems integrators POCIS (Polar Organic Chemical Integrative Sampler) and the extraction by SBSE bars (Stir bar sorptive extraction) directly in the waters sampled. Finally, analyzes of sediment completed the acquisition of data. Arount 40 stations were...
Tipo: Text
Palavras-chave: Eaux littorales; Eaux côtières; Sédiment; Métropole; DOM; Pollution; Substances chimiques; POCIS; SBSE; Coastal waters; Sediment; France; Overseas french departments; Pollution; Chemicals contaminants; POCIS; SBSE.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00259/36994/35483.pdf

Fonctionnement hydrodynamique du bassin de Thau. Validation écologique d’un modèle numerique de circulation (programme Écothau)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Millet, B.
The wind-driven flow in the closed bassin de Thau is reproduced with a two-dimensional numerical model of horizontal ciruclation using an Alternate Direction Implicit scheme. A stochastic analysis of frequencies on a yearly time scale of the velocity fields computed in the model and a spatial and stochastic treatment of the term (H2 y2), similar to an effective coefficient of horizontal dispersion by shear effect are presented. This approach will allow the delineation, in a stochastic manner, of the main structures of the circulation in the lagoon and the spatial heterogeneity of its ecohydrodynamic features. Two attempts of analogical research are presented, with sorne examples of the spatial structure in the phytoplankton biomass and the map of the...
Tipo: Text
Palavras-chave: Lagune; Modèle; Circulation; Dispersion; Sédiment; Lagoon; Model; Circulation; Dispersion; Sediment.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/00323/43399/43093.pdf

Interacting effects of Hydrobia ulvae bioturbation and microphytobenthos on the erodibility of mudflat sediments
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Orvain, Francis; Sauriau, Pierre-guy; Sygut, A; Joassard, Lucette; Le Hir, Pierre.
Microphytobenthos-macrofauna sediment interactions and their effects on sediment erodability were examined in laboratory experiments. Sediment beds were manipulated in a tidal mesocosm to produce diatom mats in exponential or in stationary phases of development after 6, 8 or 11 d of culture. These sediment beds were used in flume experiments to investigate the influence of bioturbation by the gastropod Hydrobia ulvae on both sediment and pigment resuspension as a function of the physiological state of the microphytobenthic mats. In most experiments, only a surface layer was resuspended. A model was used to analyse in detail the contribution of each variable to this surface-layer erosion. Bioturbation was the major factor controlling resuspension, and its...
Tipo: Text
Palavras-chave: Sediment; Bioturbation; Erosion; Model; Hydrobia ulvae; Physiological state; Microphytobenthos; Resuspension.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-3780.pdf

Rapport de synthèse de la campagne d'évaluation de la qualité chimique de sédiments (ROCCHSED) 2016 en Méditerranée
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bouchoucha, Marc; Tomasino, Corinne; Brach-papa, Christophe.
En 2016, des prélèvements de de sédiments ont été réalisés sur 54 stations en mer réparties le long de la façade méditerranéenne française au cours de la campagne ROCCHSED 16. Les contaminants organiques et métalliques ont été analysés conformément aux directives réglementaires et aux objectifs de bassin. Les résultats sont fournis dans ce rapport .
Tipo: Text
Palavras-chave: Contamination chimique; Sédiment; Mer Méditerranée; Chemical contamination; Sediment; Mediterranean sea.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00458/56961/58859.pdf

Spatial and temporal variations in trace metal concentrations in surface sediments of the Marennes Oleron Bay. Relation to hydrodynamic forcing
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Strady, Emilie; Kervella, Stephane; Blanc, Gerard; Robert, Serge; Stanisiere, Jean-yves; Coynel, Alexandra; Schaefer, Joerg.
Sediments quality assessment is of priority concern to provide a comprehensible overview of ecological and chemical state of an ecosystem. The Marennes-Oleron Bay, hosting the largest oyster production in France, is influenced by the historic polymetallic pollution of the Gironde Estuary. Despite, management efforts and decreasing emissions in the Gironde watershed, Cd levels in oysters from the bay are close to consumption limit (5 pig g(-1) dw. EC no. 466/2001). In this context, the aim of the study was to assess the priority metal (Ni, Cu, Zn, As, Ag, Cd, Hg, Pb and Th) concentrations in sediment within the Bay, by investigating spatial and temporal distribution variations and the role of hydrodynamic forcing. For that we selected three sites (east,...
Tipo: Text
Palavras-chave: Trace metal; Marennes Oleron Bay; Enrichment factor; Sediment; Hydrodynamic; Altus.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00038/14914/15996.pdf

PCDD/F, PBDE, and nonylphenol contamination in a semi-enclosed bay (Masan Bay, South Korea) and a Mediterranean lagoon (Thau, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Hong, Sang Hee; Munschy, Catherine; Kannan, Narayanan; Tixier, Celine; Tronczynski, Jacek; Moisan, Karine; Shim, Won Joon.
Chemical contamination of the coastal marine environment by polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) was assessed along with emerging contaminants such as polybrominated diphenyl ethers (PBDEs) in an industrially well-developed country (France) and a fast-developing country (Korea). Other chemicals, i.e. nonylphenol (NP) and 5 beta(H)-cholestan-3 beta-ol (coprostanol) were determined to trace industrial waste and/or domestic inputs. These compounds were analyzed in coastal sediments and mussels in two enclosed coastal water bodies: Masan Bay (South Korea) and Thau lagoon (France). The overall levels of target organic contaminants were higher in Masan Bay than in Thau lagoon. The mean concentrations of 17 PCDD/Fs,...
Tipo: Text
Palavras-chave: Waste chemical tracer; Organohalogen contaminant; Mussel; Sediment; Marine environment.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6941.pdf

Heterogeneity of sediments and settling particles in aerated ponds
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Kassila, Jawad; Hussenot, Jerome.
A study was conducted in seabass (Dicentrarchus labrax) and oyster (Crassostrea gigas) ponds to assess the levels of heterogeneity of sediments and settling particles. The intensity of sampling to estimate with high accuracy some characteristics will depend on the magnitude of the variation within the population under consideration. Several variables, such as total phosphate (Tot-P), total iron (Tot-Fe), total ammonium nitrogen (TAN), organic carbon (Org-C), total nitrogen (Tot-N) and P fractions were analysed during the rearing period. The box-and-whisker plots were used as graphical/statistical tools to visualize the descriptive statistical characteristics of the data. In the fish pond, the sediments have high concentrations of Tot-P, Tot-Fe and TAN in...
Tipo: Text
Palavras-chave: Sampling strategy; Resuspension; Sedimentation; Artificial aeration; Particles; Sediment.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1224.pdf

The provenance of sediments in the Gulf of Lions, western Mediterranean Sea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Revillon, Sidonie; Jouet, Gwenael; Bayon, Germain; Rabineau, Marina; Dennielou, Bernard; Hemond, Christophe; Berne, Serge.
In this study, we undertook a reconnaissance study of sediments provenance in the Gulf of Lions focusing over the last 16 ka. We used geochemical and isotopic tracers to determine the source of sediments and give insight into the weathering conditions prevailing. Sediments samples were selected both onshore and offshore from the western, eastern, and central part of the Gulf of Lions. We analyzed bulk sediments, coarse and fine silt, and clay fractions. Elemental and Nd isotope compositions appeared to differ from one grain size fraction to another one. These are interpreted in terms of zircon addition in the coarse silt fraction for the elemental concentrations and variable sources influences for the Nd isotope compositions. Our results indicate that...
Tipo: Text
Palavras-chave: Geochemistry; Provenance; Sediment; Weathering.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00043/15376/12734.pdf

Trace metals assessment in water, sediment, mussel and seagrass species - Validation of the use of Posidonia oceanica as a metal biomonitor
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lafabrie, Céline; Pergent, G; Kantin, Roger; Pergent Martini, C; Gonzalez, Jean-louis.
The accumulation of trace metals (Cd, Co, Cr, Hg, Ni and Pb) was measured in water, sediment, the mussel Mytilus galloprovincialis and the seagrass Posidonia oceanica. Samples were collected in three locations of the north-western Mediterranean (Canari, Livorno and Porto-Torres) which present different levels and sources of human impact. Analyses in the different compartments (water, sediment, M. galloprovincialis and P. oceanica) have allowed to identify Canari as the most Cd, Co, Cr and Ni contaminated site; Livorno as the most Hg contaminated and Porto-Torres as the most Pb contaminated. Furthermore, for the first time, metal concentrations found in P. oceanica have been compared with those found in the water column, in the sediment and in the...
Tipo: Text
Palavras-chave: Mediterranean sea; Marine organisms; Sediment; Seawater; Biomonitoring; Metal contamination.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3106.pdf

Successful detection of pathogenic Shiga-toxin-producing Escherichia coli in shellfish, environmental waters and sediment using the ISO/TS-13136 method
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Baliere, Charlotte; Rince, Alain; Thevenot, Delphine; Gourmelon, Michele.
The presence of highly pathogenic Shiga-toxin-producing Escherichia coli (STEC) in shellfish, upstream waters and sediment from coastal shellfish sites was evaluated using the ISO/TS-13136 method. Shellfish (oysters, mussels and cockles), water and sediment samples were collected monthly over a period of 1 year. The method used real-time PCR detection of stx1, stx2 and eae genes and genetic markers corresponding to the five major serogroups (O157, O26, O103, O111 and O145) on enrichment broths and the identification of STEC when these genes and markers were detected. stx genes were detected in the broth of 33% of shellfish batches (n = 126), 91% of water samples (n = 117) and 28% of sediment (n = 39). One stx1+, eae+ O26:H11 strain was isolated from a...
Tipo: Text
Palavras-chave: Eae; Sediment; Shellfish; Shiga-toxin-producing Escherichia coli; Stx; Water.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00250/36124/34975.pdf

Evolution des caractéristiques chimiques et biologiques des sédiments en circuit clos. III. Bilan azoté de systèmes polytrophes
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chamroux, S.; Boucher, G.
The evolution of nitrogen content in experimental closed circuit ¿and filters was followed, each tank being fed with different quantities of soluble organic matter. According to the trophic conditions, two types of metabolism could be observed : - a loss of nitrogen (denitrification), reaching almost 90% of the nitrogen in­put in eutrophic conditions, and close to 35% in mesotrophic conditions. - a gain in nitrogen (fixation), a predominant metabolism in oligotrophic and eutrophic conditions. Nitrogen retention in the sediment increases slightly with the organic matter input, but no proportionality could be established. It seems that the sediment, by its bacterial metabolisms, regulates its own organic matter rich­ness.
Tipo: Text
Palavras-chave: Circuit clos; S; Bilan azoté; Closed circuit; Sediment; Nitrogen balance.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41654/40863.pdf

Impact du sédiment sur les mortalités estivales de naissain d'huîtres creuses Crassostrea gigas en baie de Quiberon
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bedier, Edouard; Knoery, Joel Radford; Fleury, Pierre-gildas; Quiniou, Francoise; Langlade, Aime; Cozic, Amandine; Delesmont, Edith; Delesmont, Régis; Caisey, Xavier; Lecureuil, Laetitia.
The phenomenon of summer mortalities of the Pacific cupped oyster Crassostrea gigas is observed in France since the beginning of the 90's. These mortalities are classically associated to younger stages and summer temperatures and occur during the reproduction period of the animal. The studies undertaken during the project Morest (2001-2005), showed that a number of biological and environmental risks, the interaction of them induces lethal stresses for animals in physiological weakness, exists in summer. Among these risks, that which is withstood by the oysters bred close to the sediment proved to be significant in intertidal areas. In Quiberon bay (southern Brittany, France), the breeding practices of sowing oysters in deep water is thus likely to expose...
Tipo: Text
Palavras-chave: Huître; Crassostrea gigas; Mortalité; Sédiment; Composé réduit; Flux; Sulfure; Ammonium; Oyster; Crassostrea gigas; Mortality; Sediment; Reduced compound; Flux; Sulphide; Ammonia.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00108/21956/19550.pdf

Biodegradation of [D-Leu1] microcystin-LR by a bacterium isolated from sediment of Patos Lagoon estuary, Brazil
Provedor de dados: Journal of Venomous Animals and Toxins Including Tropical Diseases
Autores: Lemes,Gilmar AF; Kist,Luiza W; Bogo,Mauricio R; Yunes,João S.
Background Toxic cyanobacterial blooms are recurrent in Patos Lagoon, in southern Brazil. Among cyanotoxins, [D-Leu1] microcystin-LR is the predominant variant whose natural cycle involves water and sediment compartments. This study aimed to identify and isolate from sediment a bacterial strain capable of growing on [D-Leu1] microcystin-LR. Sediment and water samples were collected at two distinct aquatic spots: close to the Oceanographic Museum (P1), in Rio Grande City, and on São Lourenço Beach (P2), in São Lourenço do Sul City, southern Brazil. Methods [D-Leu1] microcystin-LR was isolated and purified from batch cultures of Microcystis aeruginosastrain RST9501. Samples of water and sediment from Rio Grande and São Lourenço do Sul were collected....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodegradation; Microcystin; Sediment; Patos Lagoon; Estuary; Brazil.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992015000100313

Control of Sediments, Nutrients, and Adsorbed Biocides in Surface Irrigation Return Flows
Provedor de dados: NWISRL Publications
Autores: Carter, David L.; Bondurant, James A.
The technology available for the control of sediments, nutrients, and  adsorbed biocides in surface irrigation return flows has been reviewed  and evaluated. Some of this technology could be applied immediately to  reduce sediment and associated nutrient and biocide concentrations in  surface irrigation return flows. Much of the available information  needs to be integrated to develop improved control practices. New ideas  and new control technology are needed. Economic incentive programs are  needed to improve acceptance of control technology. The factors controlling  erosion and subsequent sediment concentrations in surface  irrigation return flows, and how these factors can be managed to reduce  erosion and sediment concentrations are reviewed and...
Tipo: Technical Bulletin
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1976
URL: http://eprints.nwisrl.ars.usda.gov/1115/1/378.pdf

A Buried Drain Erosion and Sediment Loss Control System
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.; Berg, R.D.
Tipo: Technical Bulletin
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1985
URL: http://eprints.nwisrl.ars.usda.gov/1164/1/552.pdf

Imhoff cone determination of sediment in irrigation runoff
Provedor de dados: NWISRL Publications
Autores: Sojka, R.E.; Carter, D.L.; Brown, M.J.
Tipo: Article
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1992
URL: http://eprints.nwisrl.ars.usda.gov/579/1/774.pdf

Management practices for erosion and sediment control in irrigated agriculture
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.; Brockway, C.E.; Tanji, K.K.
Tipo: Book Section
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1986
URL: http://eprints.nwisrl.ars.usda.gov/774/1/614.pdf

Conservation and Use of Sediment in Irrigation Runoff
Provedor de dados: NWISRL Publications
Autores: Robbins, C.W.; Carter, D.L.
Tipo: Article
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1975
URL: http://eprints.nwisrl.ars.usda.gov/277/1/315.pdf

Needed: Sediment Ponds to Clean Return Flows
Provedor de dados: NWISRL Publications
Autores: Bondurant, J.A.; Brockway, C.E.
Tipo: Article
Palavras-chave: Sediment; Practical farm efficiency; Mass Import - autoclassified (may be erroneous).
Ano: 1974

Irrigation Water Salt Concentration Influences on Sediment Removal by Ponds
Provedor de dados: NWISRL Publications
Autores: Robbins, C.W.; Brockway, C.E.
Tipo: Article
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1978
URL: http://eprints.nwisrl.ars.usda.gov/338/1/405.pdf

Reducing erosion and sediment loss from furrow irrigated slopes
Provedor de dados: NWISRL Publications
Autores: Brown, M.J.; Sojka, R.E.
Tipo: Conference or Workshop Item
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1991
URL: http://eprints.nwisrl.ars.usda.gov/874/1/729.pdf

Reclamation and Reuse of Irrigation Sediments
Provedor de dados: NWISRL Publications
Autores: Robbins, C.W.
Tipo: Article
Palavras-chave: Sediment; Practical farm efficiency; Mass Import - autoclassified (may be erroneous).
Ano: 1987
URL: http://eprints.nwisrl.ars.usda.gov/474/1/597.pdf

Guidelines for Sediment Control in Irrigation Return Flow
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.
Tipo: Article
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1976
URL: http://eprints.nwisrl.ars.usda.gov/299/1/348.pdf

Conservation tillage effects on sediment and phosphorus losses from a furrow irrigated field
Provedor de dados: NWISRL Publications
Autores: Bjorneberg, David L.; Aase, J. Kris.
Tipo: Conference or Workshop Item
Palavras-chave: Sediment; Nutrients; Tillage; Mass Import - autoclassified (may be erroneous).
Ano: 2004
URL: http://eprints.nwisrl.ars.usda.gov/952/1/1141.pdf

Sediment delivery on rill and interrill areas
Provedor de dados: NWISRL Publications
Autores: Gilley, J.E.; Kincaid, D.C.; Elliot, W.J.; Laflen, J.M.
Tipo: Article
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1993
URL: http://eprints.nwisrl.ars.usda.gov/587/1/785.pdf

Sediment, erosion and water intake in furrows
Provedor de dados: NWISRL Publications
Autores: Brown, M.J.; Kemper, W.D.; Trout, T.J.; Humpherys, A.S.
Tipo: Article
Palavras-chave: Erosion; Infiltration; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1988
URL: http://eprints.nwisrl.ars.usda.gov/493/1/645.pdf

Sediment and phosphorus transport in irrigation furrows
Provedor de dados: NWISRL Publications
Autores: Bjorneberg, D.L.; Westermann, D.T.; Aase, J.K.; Clemmens, A.J.; Strelkoff, T.
Tipo: Article
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 2006
URL: http://eprints.nwisrl.ars.usda.gov/34/1/1184.pdf

Influence of irrigation water quality on sediment loss from furrows
Provedor de dados: NWISRL Publications
Autores: Lentz, R.D.; Sojka, R.E.; Carter, D.L.
Tipo: Conference or Workshop Item
Palavras-chave: Erosion; Sediment; Water quality; Mass Import - autoclassified (may be erroneous).
Ano: 1994
URL: http://eprints.nwisrl.ars.usda.gov/1065/1/827.pdf

Controlling Sediment in Surface Runoff
Provedor de dados: NWISRL Publications
Autores: Humpherys, A.S.
Tipo: Article
Palavras-chave: Sediment; Practical farm efficiency; Mass Import - autoclassified (may be erroneous).
Ano: 1977
URL: http://eprints.nwisrl.ars.usda.gov/341/1/410.pdf

Furrow Erosion and Sediment Losses on Irrigated Cropland
Provedor de dados: NWISRL Publications
Autores: Berg, R.D.; Carter, D.L.
Tipo: Article
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1980
URL: http://eprints.nwisrl.ars.usda.gov/369/1/454.pdf

Erosion and sedimentation processes on irrigated fields
Provedor de dados: NWISRL Publications
Autores: Trout, Thomas J.; Neibling, W.H.
Tipo: Article
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1993
URL: http://eprints.nwisrl.ars.usda.gov/609/1/824.pdf

Polyacrylamide as a tool for controlling sediment runoff and improving infiltration under furrow irrigation
Provedor de dados: NWISRL Publications
Autores: Ross, C.W.; Sojka, R.E.; Lentz, R.D.
Tipo: Conference or Workshop Item
Palavras-chave: Polyacrylamide; Sediment; Infiltration management; Runoff; Mass Import - autoclassified (may be erroneous).
Ano: 1996
URL: http://eprints.nwisrl.ars.usda.gov/921/1/927.pdf

Controlling erosion and sediment loss from furrow-irrigated cropland
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.; Brockway, C.E.; Tanji, K.K.
Tipo: Article
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1993
URL: http://eprints.nwisrl.ars.usda.gov/608/1/823.pdf

Fractional Water-Sediment Sampler
Provedor de dados: NWISRL Publications
Autores: Heinemann, William H.; Brown, Melvin J.
Tipo: Article
Palavras-chave: Sediment; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 1972
URL: http://eprints.nwisrl.ars.usda.gov/226/1/234.pdf

Within-furrow Erosion and Deposition of Sediment and Phosphorus
Provedor de dados: NWISRL Publications
Autores: Brown, Melvin J.
Tipo: Book Section
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1985
URL: http://eprints.nwisrl.ars.usda.gov/765/1/558.pdf

New furrow flume for high sediment loads
Provedor de dados: NWISRL Publications
Autores: Clemmens, A.J.; Bjorneberg, D.L.
Tipo: Article
Palavras-chave: Sediment; Research methodology; Mass Import - autoclassified (may be erroneous).
Ano: 2005
URL: http://eprints.nwisrl.ars.usda.gov/12/1/1157.pdf

Sediment-Phosphorus Relations in Surface Runoff from Irrigated Lands
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.; Brown, M.J.; Bondurant, J.A.
Tipo: Conference or Workshop Item
Palavras-chave: Sediment; Nutrients; Mass Import - autoclassified (may be erroneous).
Ano: 1976
URL: http://eprints.nwisrl.ars.usda.gov/938/1/351.pdf

Phosphorus Associated With Sediments in Irrigation and Drainage Waters for Two Large Tracts in Southern Idaho
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.; Brown, M.J.; Robbins, C.W.; Bondurant, J.A.
Tipo: Article
Palavras-chave: Drainage water (see Percolation water); Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1974
URL: http://eprints.nwisrl.ars.usda.gov/259/1/286.pdf

Management Guidelines for Controlling Sediments, Nutrients, and Adsorbed Biocides in Surface Irrigation Return Flows
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.; Bondurant, J.A.
Tipo: Conference or Workshop Item
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1977
URL: http://eprints.nwisrl.ars.usda.gov/1006/1/400.pdf

Erosion and Sedimentation on Irrigated Lands
Provedor de dados: NWISRL Publications
Autores: Bondurant, J.A.
Tipo: Conference or Workshop Item
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1977
URL: http://eprints.nwisrl.ars.usda.gov/1010/1/409.pdf

The Continuing Fight with Sediment
Provedor de dados: NWISRL Publications
Autores: Humpherys, A.S.
Tipo: Article
Palavras-chave: Sediment; Practical farm efficiency; Mass Import - autoclassified (may be erroneous).
Ano: 1977
URL: http://eprints.nwisrl.ars.usda.gov/345/1/414.pdf

Controlling erosion and sediment loss on furrow-irrigated land
Provedor de dados: NWISRL Publications
Autores: Carter, David L.
Tipo: Book Section
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1985
URL: http://eprints.nwisrl.ars.usda.gov/766/1/564.pdf

Decreasing sedimentation loss from surface irrigation into Riparian areas
Provedor de dados: NWISRL Publications
Autores: Sojka, R.E.; Lentz, R.D.
Tipo: Conference or Workshop Item
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1995
URL: http://eprints.nwisrl.ars.usda.gov/1073/1/874.pdf

Furrow irrigation erosion and sedimentation: On-field distribution
Provedor de dados: NWISRL Publications
Autores: Trout, T.J.
Tipo: Article
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1996
URL: http://eprints.nwisrl.ars.usda.gov/669/1/920.pdf

Some Aspects of Sedimentation Pond Design
Provedor de dados: NWISRL Publications
Autores: Bondurant, J.A.; Brockway, C.E.; Brown, M.J.
Tipo: Conference or Workshop Item
Palavras-chave: Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1975
URL: http://eprints.nwisrl.ars.usda.gov/897/1/343.pdf

Ponding Surface Drainage Water for Sediment and Phosphorus Removal
Provedor de dados: NWISRL Publications
Autores: Brown, M.J.; Bondurant, J.A.; Brockway, C.E.
Tipo: Article
Palavras-chave: Drainage water (see Percolation water); Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1981
URL: http://eprints.nwisrl.ars.usda.gov/381/1/475.pdf

Sediment pond effectiveness for removing phosphorus from PAM-treated irrigation furrows
Provedor de dados: NWISRL Publications
Autores: Bjorneberg, D.L.; Lentz, R.D.
Tipo: Article
Palavras-chave: Sediment; Water-soluble PAM (WSPAM); Mass Import - autoclassified (may be erroneous).
Ano: 2005
URL: http://eprints.nwisrl.ars.usda.gov/20/1/1168.pdf

A Buried Pipe System for Controlling Erosion and Sediment Loss on Irrigated Land
Provedor de dados: NWISRL Publications
Autores: Carter, D.L.; Berg, R.D.
Tipo: Article
Palavras-chave: Erosion; Sediment; Erosion; Mass Import - autoclassified (may be erroneous).
Ano: 1983
URL: http://eprints.nwisrl.ars.usda.gov/405/1/513.pdf

Sediment and polyacrylamide effects on seepage from channeled flows
Provedor de dados: NWISRL Publications
Autores: Lentz, R.D.; Freeborn, L.L.
Seepage from water streams into unlined channels determines the  proportion of water distributed to adjacent soil for plant use or soil or  groundwater recharge or conveyed to downstream reaches. We conducted  a laboratory study to determine how sediment type (none, clay,  and silt), sediment concentration (0, 0.5, and 2 g Lj1  ), and water-soluble  anionic polyacrylamide (PAM) concentration (0, 0.4, and 2 mg Lj1  )  inf luences seepage loss of irrigation water (electrical conductivity =  0.04 S mj1  ; sodium adsorption ratio = 2.2) from unlined channels in silt  loam soil. In a minif lume, a preformed channel with 7% slope was  supplied with 40 mL minj1 simulated irrigation water inf lows containing  the different treatment combinations. Runoff and...
Tipo: Article
Palavras-chave: Sediment; Seepage reduction; Mass Import - autoclassified (may be erroneous).
Ano: 2007
URL: http://eprints.nwisrl.ars.usda.gov/68/5/1233.pdf

Sediment in Irrigation and Drainage Waters and Sediment Inputs and Outputs for Two Large Tracts in Southern Idaho
Provedor de dados: NWISRL Publications
Autores: Brown, M.J.; Carter, D.L.; Bondurant, J.A.
Tipo: Article
Palavras-chave: Drainage water (see Percolation water); Sediment; Mass Import - autoclassified (may be erroneous).
Ano: 1974
URL: http://eprints.nwisrl.ars.usda.gov/258/1/285.pdf

Soil and Nutrient Losses from Small Sprinkler and Furrow Irrigated Watersheds in Southern Idaho
Provedor de dados: NWISRL Publications
Autores: Bjorneberg, D.L.; King, B.A.; Nelson, Nathan; Lee, J.H.
Sediment and associated nutrients flowing to the Snake River with furrow irrigation runoff and unused irrigation water have been a concern in the Twin Falls irrigation tract in southern Idaho. Converting furrow irrigated fields to sprinkler irrigation is one practice that has been promoted, and received financial assistance, to reduce sediment loss. Five small watersheds (330 to 1480 acres) with 10 to 70% sprinkler irrigation were monitored from 2005 to 2008 to determine if converting to sprinkler irrigation reduced sediment and nutrient losses from these watersheds. Eliminating runoff from furrow irrigated fields by converting to sprinkler irrigation will reduce sediment and nutrient losses from fields. However, there were no significant correlations...
Tipo: Conference or Workshop Item
Palavras-chave: Runoff losses; Nutrient losses; Nutrients; Sediment.
Ano: 2009
URL: http://eprints.nwisrl.ars.usda.gov/1587/1/1544.pdf

Reducing nutrient losses in runoff from furrow irrigation
Provedor de dados: NWISRL Publications
Autores: Lentz, R.D.; Westermann, D.T.; Lehrsch, G.A.
Few studies have comprehensively examined nutrient losses in runoff from furrow-irrigated fields, but the rising cost of fertilizer and finite nature of the resource encourages further research.  A 2-yr experiment measured runoff losses of sediment, particulate P and N, and dissolved NO3-N, NH4-N, K, and reactive P (DRP) from fertilized, manured, or non-amended fields.  Average nutrient losses were substantial, including 15.6 lbs ac/yr dissolved N, P, and K and 73.6 lbs ac/yr particulate N and P. The cost or replacing these nutrients with inorganic fertilizers was not trivial, at $54.69 ac/yr.  Relative to non-amended soil, manure increased dissolved K, NO3-N, and DRP in runoff by 2.1x, 1.5x, and 2.7x, respectively. Other experiments evaluated the...
Tipo: Conference or Workshop Item
Palavras-chave: Furrow irrigation; Runoff losses; Nutrients; Sediment.
Ano: 2013
URL: http://eprints.nwisrl.ars.usda.gov/1518/1/1482.pdf

Resultados del monitoreo realizado en la playa La Puntilla, Santa Fe, La Habana, durante los años 2010 – 2011
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Rivas, Lourdes; Salazar, Hermes; Peña, Leonel; Núñez, César; Felipe, Miguel.
La playa La Puntilla, ubicada en el poblado habanero de Santa Fe, constituye un importante elemento recreacional de uso público, que durante décadas ha experimentado un acelerado proceso de deterioro. Con el objetivo de conocer cuál es el comportamiento actual de la misma, se llevó a cabo un monitoreo con frecuencia trimestral durante los años 2010 y 2011. En cada uno de ellos se realizó un muestreo sedimentológico, colectándose un total de 21 muestras de arena. Además se realizaron nivelaciones en tres perfiles topográficos y mediciones de la línea de costa. Los resultados alcanzados permiten comprobar que el sector más estable de toda la playa es el este, mostrando las menores variaciones morfológicas y del diámetro medio del grano. El balance de los...
Tipo: Journal Contribution
Palavras-chave: Environmental monitoring; Sediments; Beach erosion; Beach profiles; Environmental monitoring; Sediment; Beaches.
Ano: 2012
URL: http://hdl.handle.net/1834/4568

Major controls of some metals distribution in sediments off the Nile Delta, Egypt
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Rifaat, A.E.
The sediment samples that are collected during R/V CHAIN 1975 cruise to the southeastern Mediterranean have been used to determine the major controls of metals’distribution. The sediment samples were analysed mineralogically, chemically and texturally. The parameters measured included carbonate minerals, total carbonate, organic carbon, iron, manganese, copper, zinc, chromium, lead, nickel, cobalt, vanadium, calcium, magnesium, strontium, sand, silt and clay. The statistical analysis of data showed that four major factors control the distribution of metals in sediments of the Nile cone; These are: Factor 1 terrigenous mud-calcareous sand; Factor 2 Aragonite mud-terrigenous sand; Factor 3 Algal sand; and Factor 4 Aragonite. The percentages of terrigenous...
Tipo: Journal Contribution
Palavras-chave: Sediment; Metals; Factor Analysis Coastal oceanography Sediments.
Ano: 2005
URL: http://hdl.handle.net/1834/1259

The meiofauna: macrofauna ratio across the continental slope of the Goban Spur (north-east Atlantic)
Provedor de dados: Open Marine Archive
Autores: Flach, E.; Vanaverbeke, J.; Heip, C.H.R.
Meio- and macrofauna density and biomass were estimated at the OMEX-transect across the continental slope of the Goban Spur at water depths ranging from 208 to 4460 m in the north-east Atlantic. A linear increase in the ratio between meio- and macrofauna densities with increasing water depth was found. At the continental shelf meiofauna densities were similar to 50 times higher than macrofauna densities, whereas in the abyss meiofauna densities were more than 1000 times higher. This change in ratio was due to a significant decrease in macrofauna densities with increasing water depth, whereas the meiofauna densities staved more or less at the same level. The ratio in biomass between meio- and macrofauna showed a dip at similar to 1000 m. At this depth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Sediment; Sites; Spectra; Nematoda [Nematodes].
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7325

Nematodes as indicators pollution: a case study from the Swartkops River system, South Africa
Provedor de dados: Open Marine Archive
Autores: Gyedu-Ababio, T.; Furstenberg, J.P.; Baird, D.J.; Vanreusel, A.
Nematodes from the sediments of the Swartkops estuary in Port Elizabeth, South Africa were investigated at 10 selected sites along a salinity gradient in the subtidal region at neap tide. The relation between nematode density, genera, community structure and environmental parameters including concentrations of seven heavy metals, Mn, Ti, Cr, Pb, Fe, Sn and Zn in the sediment were investigated. The nematode community structure was significantly influenced by the chlorophyll a concentration and sediment particle-size distribution. The number of genera had significant negative correlation with chlorophyll a and two heavy metals, Fe and Zn in the sediment. The habitat preferences of the genera were also assessed. A combination of the Shannon-Wiener Diversity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Check lists; Density; Diversity; Ecology; Meiobenthos; Pollution; Sediment; Sediments; Nematoda [Nematodes].
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7328

Modelling the influence of ecological interactions on reactive transport processes in sediments
Provedor de dados: Open Marine Archive
Autores: Meysman, F.
Within the natural sciences, it has long been recognized that biological activity can modify the texture, structure and composition of surface sediments. Darwin (1881) already examined the stirring of soils by burrowing earthworms and made detailed observations on how these organisms affect soil processes. A similar phenomenon can be observed in aquatic sediments, which are inhabited by a diverse biological community, supported by the flux of organic matter and oxygen from the overlying water column. Surface sediments of oceans, estuaries, lakes and rivers are highly active biogeochemical environments and an effective way to generate insight in the complexity of the interactions is by means of so-called general early diagenetic models (e.g. Soetaert et al,...
Tipo: Info:eu-repo/semantics/doctoralThesis
Palavras-chave: Chemistry; Ecology; Hydrology; Model; Sediment; Water.
Ano: 2001
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8063

Management of Water Reservoirs (Embungs) in West Timor, Indonesia
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Pradhan,   Deepa; Ancev,   Tihomir; Drynan,   Ross G.; Harris,   Michael.
Communal water storage reservoirs (embungs) that serve many villages in West Timor, Indonesia, by providing water during the prolonged annual dry season are experiencing severe sedimentation problems. Sedimentation of reservoirs progressively reduces their water storage capacity and the benefits to community. This paper investigates four alternative strategies for managing the sedimentation of a typical village embung: (1) current management (a “no management” situation), (2) soil conservation in the embung catchment, (3) periodic sediment removal and (4) both soil conservation and sediment removal. Without periodic sediment removal, an embung has a finite life dependent on the rate of sedimentation. The results indicate that periodic cleaning is clearly...
Tipo: Conference Paper or Presentation
Palavras-chave: Management; Reservoir; Sediment; Water use; West Timor.
Ano: 2009
URL: http://purl.umn.edu/48052

Morpho-histological characterization of immature of the bioindicator midge Chironomus sancticaroli Strixino and Strixino (Diptera, Chironomidae)
Provedor de dados: Revista Brasileira de Entomologia
Autores: Richardi,Vinicius Sobrinho; Vicentini,Maiara; Rebechi,Débora; Fávaro,Luis Fernando; Navarro-Silva,Mário Antônio.
ABSTRACTChironomidae immature are used as bioindicators of sediment quality in aquatic ecosystems and ecotoxicological assays. Histological descriptions for this family are outdated and limited and there are no studies with Neotropical species. The aim of this study was to describe the tissue architecture of several organs of the larva of Chironomus sancticaroli. For the description of the histological pattern, the larvae were fixed in Duboscq solution for insects at 56 °C, followed by routine histologic processing, infiltration in paraffin, and the sections were stained with Hematoxylin–Eosin. After examining the slides, the tube digestive, salivary gland, excretory, nervous, endocrine, circulatory, and integumentary systems and fat body were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecotoxicology; Histological biomarker; Sediment.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262015000300240

Sedimentary characteristics and their effects on hatching success and incubation duration of Caretta caretta (Testudines: Cheloniidae) in Espirito Santo, Brazil
Provedor de dados: Revista Brasileira de Zoologia
Autores: Fadini,Lauana Schneider; Silva,Ary Gomes; Ferreira-Júnior,Paulo Dias.
The beaches of Espírito Santo encompass the most important nesting sites of the loggerhead sea turtle, Caretta caretta (Linnaeus, 1758), in the South Atlantic Ocean. Previous research has shown that, unlike other nesting sites in Brazil, Espírito Santo harbors a large percentage of male individuals, which play an important role in maintaining the equilibrium of C. caretta populations in the South Atlantic. During the 2006/2007 reproductive season, four beaches presenting considerable geologic differences were monitored. The sedimentary features of the nesting sites (mineral composition, albedo, and grain size), nesting dates, and clutch sizes were correlated with hatching success and incubation duration. Results show that hatching success is mostly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Loggerhead sea turtle; Ecology; Nest; Sediment; Hatchling.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000300005

Great unexpected differences between two populations of the intertidal crab Neohelice granulata inhabiting close but contrasting habitats (Crustacea: Decapoda: Brachyura)
Provedor de dados: Revista Brasileira de Zoologia
Autores: Spivak,Eduardo D.; Bas,Claudia C.; Luppi,Tomás A.
ABSTRACT Two populations of the Southwestern Atlantic burrowing crab, Neohelice granulata (Dana, 1851), are separated by only 190 km. They inhabit bays that drain into a Patagonian gulf in the southernmost limit of the geographical distribution of the species: San Antonio Bay (SAO) and San José Gulf (RSJ). The population from SAO has been extensively studied, whereas that of RSJ has not. The main goal of this study is to compare the ecological and habitat characteristics of the two populations, based on samples collected on successive days during the middle of the reproductive season of the crab. The substrate of SAO is composed of a high proportion of gravel and scarce organic matter, whereas the substrate of RSJ presents twice as much silt and clay, and...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Argentine; Estuaries; Crab; Fecundity; Feeding; Growth; Maturity; Sediment.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000604001

Sewage sludge application on cultivated soils: effects on runoff and trace metal load
Provedor de dados: Scientia Agricola
Autores: Galdos,Marcelo Valadares; De Maria,Isabella Clerici; Camargo,Otávio Antonio de; Dechen,Sonia Carmela Falci.
The use of sewage sludge in agricultural soils as a macro and micronutrient source and as a soil conditioner has been one of the alternatives for its disposal. However, sewage sludge contains trace metals, which are potential sources of pollution. The goal of this study was to evaluate the effect of sewage sludge application on surface water contamination through runoff when it was applied in a soil cultivated with corn. The effect of sludge application on the concentration and load of copper, nickel and zinc and the volume of runoff water and sediment were evaluated. The experiment was set up in plots used to study erosion losses in Campinas, Sao Paulo State, Brazil. The soil is a clayey Rhodic Hapludox. Three treatments were studied: no sewage sludge,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cu; Ni; Zn; Erosion; Sediment.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300012

Random and systematic spatial variability of 137Cs inventories at reference sites in South-Central Brazil
Provedor de dados: Scientia Agricola
Autores: Correchel,Vladia; Bacchi,Osny Oliveira Santos; Reichardt,Klaus; De Maria,Isabella Clerici.
The precision of the 137Cs fallout redistribution technique for the evaluation of soil erosion rates is strongly dependent on the quality of an average inventory taken at a representative reference site. The knowledge of the sources and of the degree of variation of the 137Cs fallout spatial distribution plays an important role on its use. Four reference sites were selected in the South-Central region of Brazil which were characterized in terms of soil chemical, physical and mineralogical aspects as well as the spatial variability of 137Cs inventories. Some important differences in the patterns of 137Cs depth distribution in the soil profiles of the different sites were found. They are probably associated to chemical, physical, mineralogical and biological...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cesium-137; Spatial distribution; Radioisotope; Sediment; Radioactive tracer.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200013

Soil tillage, water erosion, and calcium, magnesium and organic carbon losses
Provedor de dados: Scientia Agricola
Autores: Bertol,Ildegardis; Guadagnin,Jean Cláudio; González,Antonio Paz; Amaral,André Júlio do; Brignoni,Leonardo Felipe.
Soil tillage influences water erosion, and consequently, losses of calcium, magnesium and organic carbon in surface runoff. Nutrients and organic carbon are transported by surface runoff in particulate form, adsorbed to soil colloids or soluble in water, depending on the soil tillage system. This study was carried out on an Inceptisol, representative of the Santa Catarina highlands, southern Brazil, between November 1999 and October 2001, under natural rainfall. The soil tillage treatments (no replications) were: no-tillage (NT), minimum soil tillage with chiseling + disking (MT), and conventional soil tillage with plowing + two diskings (CT). The crop cycles sequence was soybean (Glycine max), oats (Avena sativa), beans (Phaseolus vulgaris) and vetch...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Runoff; Sediment; Nutrient in runoff; Nutrient in sediments; Nutrient losses.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000600011

Contaminação por mercúrio em sedimento e em moluscos do Pantanal, Mato Grosso, Brasil
Provedor de dados: Zoologia
Autores: Vieira,Luiz M.; Alho,Cleber J.R.; Ferreira,Geraldo A.L.
The total level of mercury detected in the sediment and in the tissues of molluscs from the Bento Gomes basin, although low, have shown that the mercury used in the gold mining activities in the Poconé wetlands has contaminated those aquatic habitats in Pantanal. From 69 sediment samples analyzed, 26 % (N = 18) have shown levels ranging from 0.01 to 0.25µg.g-1 of mercury (moist weight). Mercury levels analyzed in 54 samples of mollusc tissues (Ampullaria scalaris Orbigny, 1835; A. canaliculata Lamarck, 1819 and Marisa planogyra Pilsbry, 1933) have shown that 30% (N = 16) were contaminated with levels ranging from 0.02 to 1.16µg.g-1 moist weight. This study shows that the mercury used in digs for gold mining and released into the environment has reached the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molluscs; Biomagnification; Contaminants; Mercury; Sediment.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000300022

Dimensionamento e sobreposição de nichos dos portunídeos (Decapoda, Brachyura), na Enseada da Fortaleza, Ubatuba, São Paulo, Brasil
Provedor de dados: Zoologia
Autores: Pinheiro,Marcelo Antonio Amaro; Fransozo,Adilson; Negreiros-Fransozo,Maria Lúcia.
The niche breadth of the Portunidae and their overlap on the subtidal sediments of Fortaleza bay, Ubatuba (São Paulo) was analyzed. Samples were made monthly from November/1988 to October/1989, inseven areas of the bay using a shrimp fishery boat equipped with two otter-trawls. Each area was characterized based on environmental factors such as depth, temperature, salinity, dissolved oxygen, organic matter and granulometric composition of the sediment. The number of individuais of each species was registered to each area (resource). Levins's standardized measure (BA) and niche percentage were calculated. Five species of swimming crabs were recorded in this study: Callinectes ornatus Ordway, 1863, Arenaeus cribrarius (Lamarck, 1818), Portunus spinimanus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Portunidae; Distribution; Niche; Sediment; Swimming crab.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000200010

Geological control of Podocnemis expansa and Podocnemis unifilis nesting areas in Rio Javaés, Bananal Island, Brazil
Provedor de dados: Acta Amazonica
Autores: Ferreira Júnior,Paulo Dias; Castro,Paulo de Tarso Amorim.
The distribution of the nests of Podocnemis expansa (Amazon turtle) and Podocnemis unifilis (yellow-spotted side neck turtle) along the point bars of the Javaés River in Bananal Island, demonstrates a clear preference of these chelonians for differentiated geological environments, in respect to the morphology, grain size or height of the nests in relation to the level of the river. The topographical distribution and the differences in the grain size of the sediments that compose the point bars of the river, originated from the multiple sedimentary processes, and make possible the creation and separation of different nesting environments. Each turtle species takes advantage of the place that presents physiographic characteristics appropriate to the hatching...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Podocnemis; Turtle; Sediment; Nesting place; Incubation duration.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000300010

Ecotypes and virulence factors of Salmonella spp. detected in shrimp farms in State of Ceara, Brazil
Provedor de dados: Acta Scientiarum: Biological Sciences
Autores: Carvalho, Fátima Cristiane Teles de; Rodriguez, Marina Teresa Torres; Menezes, Francisca Gleire Rodrigues de; Sousa, Oscarina Viana de; Hofer, Ernesto; Vieira, Regine Helena Silva dos Fernandes.
 Our objective was to group in ecotypes 12 serovars of Salmonella isolated from shrimp farming environments in the State of Ceara (Northeast Brazil). Grouping was done based on genotypic virulence factors. Two groups based on the similarity of the Box-PCR were identified: a group consisting of three strains (01 S. ser. Madelia serovar and 02 S. ser. enterica subs. houtenae) and another group consisting of nine isolates (02 S. ser. Saintpaul serovars; 03 S. ser. Infantis; 02 S. ser. Panama; 01 S. enterica subs. enterica; and 01 S. enterica subs. houtenae). Distribution pattern of the serovars was not influenced by the origin matrices (water and sediment). Plasmid virulence genes pefA and invA were detected, unrelated to the serovar and environmental origin...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediment; Water; Enteric bacteria.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/34607

Reductions in turbidity and Escherichia coli density using passive polymer treatment
Provedor de dados: Agricultural Engineering International : The CIGR e-journal
Autores: Berry, James; Sawyer, Calvin; Privette, Charles; Hayes, John; Bridges, William.
Current research shows sediment basins may act as reservoirs for potentially harmful bacteria, including Escherichia coli (E. coli). E. coli preferentially attach to clay-sized particles and have been found in sediment basin outflows with high turbidity levels containing concentrations exceeding water quality standards recommended by the US Environmental Protection Agency. Since research shows E. coli preferentially attach to the clay fraction within sediment, it was hypothesized that a reduction in turbidity and TSS would create a corresponding reduction in bacterial density.  Construction site sediment basin discharge was simulated to determine whether a sediment tube configuration using anionic polymer application could reduce E. coli densities. Based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ag engineering; Biosystems engineering; Civil engineering E. coli; Sediment; Stormwater; Sediment basin; Construction; Runoff.
Ano: 2017
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3967

Source correlation of biomarkers in a mangrove ecosystem on Santa Catarina Island in southern Brazil
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Silva,Cesar A.; Madureira,Luiz A.S.
The relative distribution of several compounds identified in four samples of recently deposited sediments of the Itacorubi Mangrove located on the Santa Catarina Island, southern Brazil, was compared with similar data on compounds extracted from fresh leaves of three mangrove species (Avicennia schaueriana, the dominant species in the area, Rhizophora mangle and Laguncularia racemosa) and the Gramineae Spartinna alterniflora. Terpenols, previously identified in mangrove species in northern Brazil, were also found. A. schaueriana mainly contains β-amyrin (90.6 μg g-1 of extractable organic matter); low amounts of friedelin, betulin and germanicol were detected only in the leaf extract of this species. R. mangle also contained a significant amount of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomarkers; Leaf; Mangrove; Santa Catarina; Sediment.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300002

Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: BURONE,LETICIA; MUNIZ,PABLO; PIRES-VANIN,ANA MARIA S.; RODRIGUES,MARCELO.
Analyses of organic matter content, organic carbon, nitrogen, sulfur and granulometric variables were performed on 101 surface sediment samples from Ubatuba Bay in order to investigate the spatial distribution of organic matter, its origin and the relationships among its components. The samples were obtained with a manual corer, from water depths between 1 and 15m during 5 cruises of the R/V "Veliger II'', two months apart. Pearson correlation, regression and Principal Component Analysis (PCA) statistical methods were used to analyze the data. Strong correlations between organic matter and fine sediment fractions were obtained. The PCA revealed at least two main sample groups that reflect the different environmental conditions prevalent in the bay. There...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Sediment; C/N ratio; Ubatuba; Brazil.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100009

Geochemistry and mineralogy of recent sediments of Guanabara Bay (NE sector) and its major rivers - Rio de Janeiro State - Brazil
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: FARIA,MARCIA DE MELO; SANCHEZ,BRAZ A.
Geochemical and clay mineralogical studies of bottom sediments collected along the Macacu and Caceribu rivers and Guanabara Bay were carried out in order to investigate the relationship between major source areas and recent sediments of the bay. Clay mineralogy includes different groups with selective distribution conditioned by geomorphic features and depositional settings. Micaceous clay minerals are abundant near parent rock in the upper course, whereas kaolinite derived from varied sources is gradually concentrated towards the estuary. In the Guanabara Bay, kaolinite accumulates near river mouths, while micaceous clay minerals are converted into mixed layers in the estuary. Analyses of heavy metal contents reveal higher levels of Zn and Cu in sediments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metal; Clay mineral; Sediment; Guanabara Bay.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100010

Metal content and distribution in surface sediments in an industrial region
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: SCHNEIDER,ISMAEL L.; TEIXEIRA,ELBA C.; RODRIGUES,MARIA LUCIA K.; ROLIM,SILVIA B.A.
The present study aimed to evaluate Cu, Cr, Ni, Zn, Pb, Mn, Al, and Fe contents, as well as their geochemical partitioning in Sinos River basin sediments in southern Brazil. This basin is a densely populated area with a substantial number of industries, especially metallurgy, electroplating works, steel mills, petrochemicals, and tanneries. The total metal concentrations were determined by X-ray fluorescence and the sediment phase concentrations were determined by applying the BCR-701 sequential extraction method proposed by the Community Bureau of Reference of the European Community, using ICP/OES. The contents extracted by a solution of 0.5 mol/L HCl were also considered. Metal contents were evaluated in the sediment fraction &lt;63 µm. Results in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BCR-701; Metals; Sediment; Sequential extraction.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301043

A reevaluation of the late quaternary sedimentation in todos os Santos Bay (BA), Brazil
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: LESSA,GUILHERME C.; BITTENCOURT,ABÍLIO C.S.P.; BRICHTA,ARNO; DOMINGUEZ,JOSÉ M. L.
Todos os Santos Bay is a large (&lt;img ALIGN="BOTTOM" BORDER="0" SRC="http:/img/fbpe/aabc/v72n4/0052img1.gif" ALT="$ \approx$"&gt; 1000 km²), structurally controlled tidal bay in northeast Brazil. Three main drainage basins debouch into the bay, providing a mean freshwater discharge of 200 m³/s (prior to 1985), or less than 1% of the spring tidal discharge through the bay mouth. Based on the result of several sedimentological studies performed in the 1970's, five surface sedimentary facies were identified inside the bay, namely i) transgressive siliciclastic marine sand facies; ii) transgressive bay sand-mud facies; iii) a transgressive carbonate marine sand facies; iv) regressive bay-mud facies, and v) regressive fluvial sand facies. The spatial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Sediment; Stratigraphy; Holocene.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652000000400008

Past and present land use influences on tropical riparian zones: an isotopic assessment with implications for riparian forest width determination
Provedor de dados: Biota Neotropica
Autores: Salemi,Luiz Felippe; Lins,Silvia Rafaela Machado; Ravagnani,Elizabethe de Campos; Magioli,Marcelo; Martinez,Melissa Gaste; Guerra,Fernando; Vidas,Natassia Bonini; Fransozi,Aline; Ferraz,Silvio Frosini de Barros; Martinelli,Luiz Antonio.
Abstract In this article, by using carbon stable isotopes, we assessed the past and present land use influences that riparian areas are subject within agricultural landscapes. Emphasis is given to the understanding of the effects of the 2012 Brazilian Forest Act on such areas. We selected five riparian areas within a highly C4 dominated agricultural landscape. Three of them had 30 meters native riparian forest buffer (NRFB) and two of them had 8 meter and no NRFB. We used three 100 meter-transects located 5, 15 and 30 meters relative to stream channel to obtain soil samples (0 - 10 cm). All riparian areas presented soil carbon isotopic signatures that are not C3 (native forests) irrespective of having or not 30 meters NRFB. Two cases presenting less than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Watershed; Soil degradation; Organic matter; Sediment; Carbon cycling.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000200210

Methanogenesis in an impacted and two dystrophic coastal lagoons (Macaé, Brazil)
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Furtado,André Luiz dos Santos; Casper,Peter; Esteves,Francisco de Assis.
This study investigated the methanogenic activity in sediment of the Imboacica (human impacted), Cabiúnas and Comprida coastal lagoons in Rio de Janeiro State (Brazil). Methane was not detected in water and sediment samples from the three lagoons. The measured nutrient concentrations in the pore-water indicated that methanogens activity was not limited by nutrients. Methanogenic activity was not detected under in vitro conditions, indicating that terminal organic carbon mineralisation via methanogenesis was negligible for the top 6 cm of sediment at the sampling time.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal lagoon; Methane; Sediment; Nutrients.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200011

Use of the burrowing amphipod Tiburonella viscana as a tool in marine sediments contamination assessment
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Abessa,Denis M.S.; Sousa,Eduinety C.P.M.; Rachid,Bauer R.F.; Mastroti,Ricardo R.
The acute toxicity of sediment samples from Santos Estuary was evaluated by using sediment toxicity tests with the burrowing amphipod Tiburonella viscana. Survival of amphipods acclimated for 2 and 15 days was also analyzed. The sensitivity of this species was evaluated by 48h-exposure tests using potassium dichromate (K2Cr2O7) as a reference substance. The sediment samples from Gonzaga Beach, Prainha and Paranapuã Beach were not toxic to T. viscana, whereas the samples collected at Santos Channel and São Vicente Bay were toxic. The acclimation period did not affect survival significantly, in spite of the higher mortality within the 15-day acclimated group. The estimated 48-h LC50 to K2Cr2O7 was 6.029 mg/L (3.27-11.12). Toxicity tests using T. viscana were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphipoda; Tiburonella viscana; Toxicity test; Sediment.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000200009

Efeito de sedimentos contaminados sobre a excreção de nitrogênio do camarão Penaeus paulensis
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Moraes,Rosane B.C.; Pfeiffer,Wolfgang C.; Guimarães,Jean R.; Borges,Alexandre Luiz N.; Campos,Alexandre N.
Physiological response (ammonia excretion) of the shrimp Penaeus paulensis exposed to contaminated sediments of Guanabara Bay and Sepetiba Bay (Rio de Janeiro - Brazil), was monitored for 52 days. The toxicity tests were conducted in aquarium with a water feedback system and a sediment layer of 2 cm. The sediment from Saco do Engenho (Sepetiba Bay) was the most toxic, affecting the excretion of P. paulensis. In sediment from Sepetiba Bay the ammonia excretion was significantly enhanced after 10 days (S. Engenho) and 52 days (I. Madeira) of exposition.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediment; Toxicity; Excretion; Penaeus.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400012

A simple approach to integrate the ecotoxicological and chemical data for the establishment of environmental risk levels
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Cesar,Augusto; Abessa,Denis Moledo de Souza; Pereira,Camilo Dias Seabra; Santos,Aldo Ramos; Fernández,Nuria; Choueri,Rodrigo Brasil; DelValls,Tomas Angel.
In this work, multivariate and numeric methods were used to integrate the chemical and ecotoxicological data obtained for the sediments from the Santos Estuarine System, and for the vicinity of the discharges of the Submarine Sewage Outfall of Santos, in order to establish more accurately the environmental risks, identify the priority areas and thus provide guidance to control the programs and public policies. For both the datasets, the concentrations which exceeded numeric sediment guidelines tended to be associated to toxicity. For the estuary, this trend was corroborated by the correlations between the toxicity and Cu and PAHs levels, whereas for the sewage outfall region, this was observed through the correlation between the toxicity and Hg contents....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediment; Contamination; Toxicity; Tiburonella viscana; Environmental risk assessment.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100028

Mercury and organic carbon distribution in six lakes from the North of Rio de Janeiro State
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Sousa,Wanderson Primo de; Carvalho,Carlos Eduardo Veiga de; Carvalho,Claudia Calasans Veiga de; Suzuki,Marina Satika.
The objectives of the study was to evaluate the mercury contamination in sediments of six lagoons located in the north region of Rio de Janeiro State, trying to relate the Hg concentrations with factors that could influence it's mobility, such as organic carbon. The highest values observed in the superficial sediments in lakes like Campelo (349,6 µg.kg -1) suggested a recent Hg input into the system. The correlation Hg/Organic carbon was positive for most areas, indicating that the organic carbon was a significant parameter for Hg retention in this region. The obtained results suggested that the mercury used as fungicide in agriculture lands and in gold mining areas in the past were probably responsible for the contamination of this environment.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mercury; Organic carbon; Sediment; Lakes.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100019

Methane concentration in water column and in pore water of a coastal lagoon (Cabiúnas lagoon, Macaé, RJ, Brazil)
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Fonseca,André Luiz dos Santos; Minello,Murilo; Marinho,Claudio Cardoso; Esteves,Francisco de Assis.
The aim of this study was to evaluate methane concentration in water column and pore water at limnetic and littoral regions of a coastal lagoon. At the littoral region samples were taken from three monospecific macrophytes stands (Typha domingensis, Eleocharis interstincta and Potamogeton stenostachys). The methane concentration in the pore water at the littoral region was higher than the concentration found at the limnetic region in each fraction of the sediment. The higher methane concentration in the superficial fraction of the sediment (0-2 cm) was shown at the P. stenostachys stand (3.7 mM). It was the only significantly different (p&lt;0.05) from the limnetic region. The pore water methane concentration increased with depth at the aquatic macrophytes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methane; Water column; Sediment; Aquatic macrophytes; Coastal lagoons.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000200018

Characterization of the physical and chemical parameters of Ubatuba Bay, Northern Coast of São Paulo State, Brazil
Provedor de dados: Brazilian Journal of Biology
Autores: MANTELATTO,F. L. M.; FRANSOZO,A.
The objective of the present study is to characterize the physical and chemical environmental parameters of Ubatuba Bay (SP), as a subsidy for studies of the composition and distribution of benthic crustaceans which live on the non-consolidated sublittoral bottom of this area. Depth, temperature, salinity, dissolved oxygen, organic content and granulometric composition of the sediments were measured monthly from September/95 to August/96 in eight subareas of the bay. The bay presents an average depth of 9.3 m and is characterized by the following annual mean values for the hydrologic factors: temperature 23.8 ºC, salinity 33.2‰ and dissolved oxygen 5.11 mg/l. The annual mean for the organic matter content of the bay bottom sediments was 11.8% and most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crustacea; Environmental factors; Sediment; Organic content; Ubatuba; Brazil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100004

Molecular identification of the occurrence of magnetotactic bacteria in fresh water sediments (Czech Republic)
Provedor de dados: Brazilian Journal of Microbiology
Autores: Rulík,Martin; Chaudhary,Prem Prashant.
Magnetotactic bacteria (MTB) are of considerable interest because of their importance in the manufacture of various bioinspired materials. In order to find out the status of magnetotactic bacteria at three different sediment in Czech Republic, samples collected from both standing and running freshwaters were subjected to molecular diversity analysis by using 16S rRNA gene approach. Total community DNA from sediment sample was isolated and used for PCR, cloning and sequence analysis. Of the 24 analyzed sequences, six clones are closely related to Magnetobacterium sp. affiliated with the Nitrospira phylum which showed the dominance of Magnetobacterium phylotypes in the sample. This study will provide useful insight about the community structure of MTB in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Magnetotactic bacteria; Sediment; PCR; Cloning; Phylogeny; 16S rRNA gene.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400016