Consulta: subjectFacets:"Sediments"
Registros recuperados: 141
Data/hora: 14/06/2024 02:33:43

Spatio-temporal distribution of spionids (Polychaeta-Spionidae) in an estuarine system in south-central Chile
Provedor de dados: 97
Autores: DÍAZ-JARAMILLO,MAURICIO; MUÑOZ,PAMELA; DELGADO-BLAS,VÍCTOR; BERTRÁN,CARLOS.
This study is based on the identification and distribution of spionid polychaetes in relation to abiotic characteristics of the environment at the mouth of the Valdivia-Tornagaleones estuary in south-central Chile. Four samplings were carried out in 2005, in which eight species were identified including Aquilaspio peruana, Boccardia polybranchia, Carazziella carrascoi, Dipolydora socialis, Minuspio patagónica, Rhynchospio glutaea, Scolelepis quinquedentata and Spiophanes sp. As it is typical of other estuaries in south central Chile, spionids were an important component of the macroinfauna of the Valdivia estuary. The distribution of the Spionidae family in the system showed higher species richness in the outer reach of the estuary but higher abundance...
Tipo: Journal article
Palavras-chave: Polychaeta; Spionidae; Distribution; Estuary; Salinity; Sediments; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000400005

Multidisciplinary approach to assess the water self-depuration characteristics of Suquía River (Córdoba, Argentina)
Provedor de dados: 97
Autores: Merlo,Carolina; Abril,Adriana.
BACKGROUND: We analyzed the following characteristics of water self-depuration capacity along a polluted river (Suquía River) in Argentina: (a) abundance of microbial metabolic groups, (b) cover and type of vegetation, and (c) type and concentration of soil and sediment humic substances. The objective was to establish the modifications of water self-depuration characteristics of the polluted sites in comparison to a reference site in order to provide basic data for ecological restoration programs. Five samples of riparian soil, water, and sediments were collected at a reference site and five polluted sites during low- and high-flow water periods. In each site the vegetation type and soil cover were recorded. In all samples the abundance of ammonifiers,...
Tipo: Journal article
Palavras-chave: Humic substances; Microbial groups; Sediments; Sulfate reducer; Vegetation type.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100011

Bacterial diversity in the sediments of a temperate artificial lake, Rapel reservoir
Provedor de dados: 97
Autores: DORADOR,CRISTINA; CASTILLO,GABRIELA; WITZEL,K. P.; VILA,IRMA.
Rapel reservoir is an eutrophic system in Chile that has undergone a series of anthropogenic impacts in recent decades. To provide a better understanding of the processes occurring in the reservoir, we examined bacterial composition from surface sediments using traditional microbiology techniques and molecular biology tools. Our results showed significant temporal variation in the physical and chemical composition of the water column, but no depth-related differences during the study period. To detect temporal changes in bacterial composition, cultivable heterotrophic bacteria, heterotrophic iron oxidizing bacteria, and sulfate-reducing bacteria were extracted from the surface sediments and their concentration measured. Microbial diversity in sediments was...
Tipo: Journal article
Palavras-chave: Sediments; Sulfate-reducing bacteria; 16S rDNA.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000200007

Living (stained) calcareous benthic foraminifera from recent sediments off Concepción, central-southern Chile (&amp;#126;36° S)
Provedor de dados: 97
Autores: TAPIA,RAÚL; LANGE,CARINA B; MARCHANT,MARGARITA.
This study examines onshore-offshore and vertical distribution of living (Rose Bengal stained) benthic foraminifera (&gt; 180 &amp;#956;m fraction) from three sediment stations along a bathymetric transect off Concepción, Chile (station 18 = 88 m water depth, station 26 = 120 m, station 40 = 1,030 m), within and below the oxygen minimum zone. All cores were collected in austral winter. Calcareous foraminifera dominated the three stations. The species composition, living foraminifera density, and vertical distribution patterns within the sediment changed in accordance with bottom water dissolved oxygen concentration and food availability. Onshore-offshore pattern revealed overall highest living foraminiferal densities at shelf stations 18 and 26 where...
Tipo: Journal article
Palavras-chave: Benthic foraminifera; Sediments; Oxygen minimum zone; Concepción; Chile.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300009

20th century fluctuations in the abundance of siliceous microorganisms preserved in the sediments of the Puyuhuapi Channel (44° S), Chile
Provedor de dados: 97
Autores: REBOLLEDO,LORENA; LANGE,CARINA B.; FIGUEROA,DANTE; PANTOJA,SILVIO; MUÑOZ,PRÁXEDES; CASTRO,RODRIGO.
We present a 100-year reconstruction of siliceous export production from sediments of the Puyuhuapi Channel (44° S, 70° W) in the Chilean fjords. We use accumulation rates and concentrations of diatoms and silicoflagellates, organic carbon (Corg) and biogenic opal (SiOPAL) as proxies of export production, and fluctuations in the contribution of freshwater diatoms as proxies of rainfall in the hinterland and river runoff. Box core sediments collected at two sites within the Puyuhuapi Channel were analyzed: Station 35 (at the head of the fjord; 56 m water depth) and Station 40 (in the middle of the Channel; 270 m water depth). Surface sedimentation rates were 0.75 cm yr-1 at Station 35 and 0.25 cm yr-1 at Station 40. SiOPAL content averaged ~ 4 % at both...
Tipo: Journal article
Palavras-chave: Siliceous microorganisms; Diatoms; Sediments; Export production; Puyuhuapi Channel; Chilean fjords.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000300009

Lime application methods, water and bottom soil acidity in fresh water fish ponds
Provedor de dados: 63
Autores: Queiroz,Julio Ferraz de; Nicolella,Gilberto; Wood,Charles Wesley; Boyd,Claude Elson.
Although some methods for determining lime requirement of pond soils are available and commonly used, there is still no consensus on whether it is more effective to apply liming materials to the bottoms of empty ponds or to wait and apply them over the water surface after ponds are filled. There is also little information on how deep lime reacts in pond sediment over time, and whether the depth of reaction is different when liming materials are applied to the water or to the soil. Therefore, three techniques for treating fish ponds with agricultural limestone were evaluated in ponds with clayey soils at a commercial fish farm. Amounts of agricultural limestone equal to the lime requirement of bottom soils were applied to each of three ponds by: direct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liming; Total alkalinity; Total hardness; Sediments.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500001

Caracterização e classificação dos solos de três topossequências da Amazônia Ocidental.
Provedor de dados: 119
Autores: BERNINI, T. A.; PEREIRA, M. G. P.; MORAES, A. G. de L.; SANTOS, L. L. dos; ANJOS, L. H. C. dos; WADT, P. G. S.
Este trabalho tem como objetivo caracterizar e classificar solos formados a partir de material de origem de natureza sedimentar em três topossequências da Amazônia Ocidental, no Acre. A área de estudo localiza-se no município de Sena Madureira (T1) e Manoel Urbano (T2) na região da regional do Purus e no município de Feijó (T3) na Regional do Tarauacá e Envira do estado do Acre. Em cada uma das áreas foram abertas trincheiras em três pontos distintos de uma toposseqüência (terço superior [P1], terço médio [P2] e terço inferior de encosta [P3]). Os solos foram classificados com base no Sistema Brasileiro de Classificação dos Solos [12] mediante as propriedades morfológicas e dados analíticos. Os horizontes superficiais A apresentaram pequena espessura,...
Tipo: Anais e Proceedings de eventos
Palavras-chave: Clasificación de suelos; Perfiles del suelo; Arcilla; Sena Madureira (AC); Manoel Urbano (AC); Feijó (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental.; Classificação do Solo; Perfil do Solo; Sedimento; Argila.; Soil classification; Soil profiles; Sediments; Clay.
Ano: 2009
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/512058

Influencia da cobertura vegetal morta na reducao da velocidade da enxurrada e na distribuicao de tamanho dos sedimentos transportados.
Provedor de dados: 119
Autores: LOPES, P. R. C.; COGO, N. P.; CASSOL, E. A.
O efeito da porcentagem de cobertura do solo com residuos culturais na reducao da velocidade do escoamennto superficial da agua e distribuicao de tamanho dos sedimentos erodidos, foi avaliado em condicoes de chuva simulada, na Estacao Experimental Agronomica da UFRGS, em Guaiba (RS). A area utilizada para o estudo encontra-se em solo franco-arenoso (Podzolico Vermelho-Amarelo distrofico abrupto petroferrico), com 7,5% de declividade. Os tratamentos principais consistiram em residuos culturais de milho, trigo e soja, espalhados uniformemente sobre superficie de solo preparada convencionalmente, em percentagens de cobertura do solo de 0 a 100% Independente do tipo de residuo cultural utilizado, o aumento na percentagem de cobertura do solo diminuiu...
Tipo: Artigo de periódico
Palavras-chave: Cobertura vegetal morta; Escoamento superficial; Water irosion; Crop residue; Solo; Enxurrada; Erosão Hídrica; Sedimento; Velocidade; Soil; Mulching; Runoff; Sediments; Velocity.
Ano: 1987
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133798

Comportamento hidro-erosivo de depósitos sedimentares da Formação Macacu situados na Ilha do Governador-RJ.
Provedor de dados: 119
Autores: PORTOCARRERO, H.; CAMPOS, T. M. P. de; ANDRADE, A. G. de; BRIZZI, R. R.
A Ilha do Governador, inserida no contexto do Gráben da Guanabara, é marcada pela presença de exposições de depósitos sedimentares paleogênicos pertencentes à Formação Macacu. Tais exposições, atualmente evidentes em cortes de estrada e antigas jazidas para extração de material terroso, apresentam elevado grau de degradação causada pela erosão hídrica, o que é constatado a partir da presença de sulcos e voçorocas. O presente trabalho teve como objetivo analisar o comportamento hidro-erosivo de depósitos sedimentares da Formação Macacu expostos em uma jazida situada na área patrimonial do Aeroporto Internacional do Rio de Janeiro, buscando relacionar sedimentologia, hidráulica e erodibilidade. Após a interpretação geológica das exposições de sedimentos,...
Tipo: Artigo de periódico
Palavras-chave: Erodibilidade; Sedimento; Porosidade; Permeabilidade; Solo; Hidráulica; Sediments; Permeability; Porosity; Erodibility; Soil.
Ano: 2021
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133875

Chemical, physical and mineralogical analysis of soil and marine sediments from King George Island, South Shetland Archipelago, Antarctica.
Provedor de dados: 119
Autores: SCHUCH, L. A.; ZAGO, A.; AZEVEDO, A. C. de; REINERT, D. J.; BARRETO, W. de O.; SANTOS, H. G. dos; NORDEMANN, D. J. R.
During the summer months 1988/89 and 1991/92, soil and marine sediments samples were collected around the Brazilian Antarctic Station "Comandante Ferraz" (62§S,58§W) located on King George Island, South Shetland Archipelago. X Ray Diffractions (XRD) of clay fractions and another pedological analysis were carried out. Great differences were observed between soil layer 1 (0-5 cm) and soil layer 2(5-10 cm) regarding to particle size and chemical characteristics. The XRD patterns did not show differences among layers. The marine sediments present a finer particle size distribution. In these sediments there is a dominance of both regular and irregular interestratified minerals as well as mica-biotite. The physical, chemical and mineralogical soil...
Tipo: Artigo de periódico
Palavras-chave: Baia almirantado; Admiralty Bay; Solo; Sedimento; Antarctica; Sediments; Soil.
Ano: 1997
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/335100

Estimativa de produção de sedimentos em suspensão no trecho baixo do Rio São Francisco: subsídios para gestão ambiental.
Provedor de dados: 119
Autores: MELO, S. C. de.
Dissertação (Mestrado em Gestão Ambiental) - Instituto Federal de Educação, Ciência e Tecnologia de Pernambuco, Recife. Orientador: José Coelho de Araújo Filho, CNPS; Coorientadora: Renata Maria Caminha Mendes de Oliveira Carvalho, IFPE.
Tipo: Teses
Palavras-chave: Barragem; Sedimento; Vazão; Dams (hydrology); Sediments; Flow.
Ano: 2019
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114585

Curvas-chave de descargas de sedimentos em suspensão no Baixo São Francisco.
Provedor de dados: 119
Autores: MELO, S. C. de; ARAUJO FILHO, J. C. de; CARVALHO, R. M. C. M. de O.
O conhecimento da análise quantitativa das concentrações de sedimentos em suspensão transportados pelo rio São Francisco bem como sua relação com as vazões é de muita importância, pois pode auxiliar na identificação dos efeitos da intervenção humana e ou ocasionados pelas condições naturais da região. As regiões a jusante dos barramentos no rio São Francisco apresentam como principal consequência a regularização das vazões e a diminuição das concentrações de sedimentos. O objetivo da pesquisa foi determinar as curvas-chave de sedimentos em suspensão (CCS) nas estações fluviométricas instaladas no Baixo São Francisco (BSF) após a barragem de Xingó. Para o estabelecimento dessas curvas foram utilizados dados de vazão e concentração de sedimentos em...
Tipo: Artigo de periódico
Palavras-chave: Barragem; Vazão; Sedimento; Dams (hydrology); Flow; Sediments.
Ano: 2020
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124900

Further development of small hydropower facilities will significantly reduce sediment transport to the Pantanal wetland of Brazil.
Provedor de dados: 119
Autores: FANTIN-CRUZ, i.; OLIVEIRA, M. D. de; CAMPOS, J. A.; CAMPOS, M. M. de; RIBEIRO, L. de S.; MINGOTI, R.; SOUZA, M. L. de; PEDROLLO, O.; HAMILTON, S. K.
Small hydropower (SHP) facilities, which are defined by installed capacities &lt;10?50 MW, are increasingly being built around the world. SHPs are viewed as less environmentally harmful than larger dams, although there has been little research to support that assertion. Numerous SHPs have been built, and many more are in development or proposed, in rivers that drain into the Pantanal, a world-renowned floodplain wetland. Three river systems with the largest contributions of sediments to the Pantanal? the Cuiabá, upper Taquari, and Coxim rivers?remain largely undammed. The upland tributaries transport sediments into the Pantanal, thereby affecting geomorphological dynamics and biological productivity of downstream floodplains. This study presents...
Tipo: Artigo de periódico
Palavras-chave: Hidrelétrica; Barragem; Sedimento; Dams (hydrology); Sediments; Hydroelectric power.
Ano: 2020
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1126736

Trace metals concentrations in mangrove sediments of Sepetiba Bay (Rio de Janeiro, Brazil): microwave assisted digestion with nitric acid and aqua regia.
Provedor de dados: 119
Autores: SOUZA, P. S. A. de; MARQUES, M. R. C.; SOARES, M. L. G.; PEREZ, D. V.
Mangrove sediments have a great capacity to accumulate trace metals that can be remobilized thus contaminating the water and biota. Concentrations of trace metals (Cu, Ni, Pb and Zn) in mangrove sediment samples from Sepetiba Bay (Brazil) determined using two different protocols were compared, in order to give support for the establishment of a future legislation of environmental assessment of sediment quality in Brazil. Surface sediment samples were collected in three mangrove forests of Sepetiba Bay and were analyzed to determine pH, Eh, salinity, and the percentages of sand, silt, clay, total organic carbon (TOC), total N and total P. Concentrations of Cu, Ni, Pb and Zn were determined using two microwave acid digestion protocols, with two different...
Tipo: Artigo de periódico
Palavras-chave: Trace metals; Sediment contamination; Sediments.
Ano: 2012
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1135757

The microbiome of brazilian mangrove sediments as revealed by metagenomics.
Provedor de dados: 119
Autores: ANDREOTE, F. D.; JIMENEZ, D. J.; CHAVES, D.; DIAS, A. C. F.; LUVIZOTTO, D. M.; DINI-ANDREOTE, F.; FASANELLA, C. C.; VARON LOPEZ, M.; BAENA, S.; TAKETANI, R. G.; MELO, I. S. de.
ABSTRACT: Here we embark in a deep metagenomic survey that revealed the taxonomic and potential metabolic pathways aspects of mangrove sediment microbiology. The extraction of DNA from sediment samples and the direct application of pyrosequencing resulted in approximately 215 Mb of data from four distinct mangrove areas (BrMgv01 to 04) in Brazil. The taxonomic approaches applied revealed the dominance of Deltaproteobacteria and Gammaproteobacteria in the samples. Paired statistical analysis showed higher proportions of specific taxonomic groups in each dataset. The metabolic reconstruction indicated the possible occurrence of processes modulated by the prevailing conditions found in mangrove sediments. In terms of carbon cycling, the sequences indicated...
Tipo: Separatas
Palavras-chave: Metagenômica; Mangue; Bactéria; Sedimento; Mangrove forests; Sediments; Metagenomics; Delta-Proteobacteria; Gamma-Proteobacteria.
Ano: 2012
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/943451

Chemical composition of phytoplankton from the estuaries of Eastern Amazonia
Provedor de dados: 36
Autores: Vilhena,Maria do Perpetuo Socorro Progene; Costa,Marcondes Lima da; Berrêdo,José Francisco; Paiva,Rosildo Santos; Almeida,Pryscila Denise.
Phytoplankton is important bioindicator of chemical and biological modifications of natural ecosystems. The objective of this study was to determine the total chemical composition of the phytoplankton of the Pará and Mocajuba estuaries on the eastern coast of the Amazon region in the Brazilian state of Pará. The chemical composition of the surface water, bottom sediments (total sample and bioavailable fraction), and the phytoplankton were determined by inductively coupled plasma optical emission spectrometry. Phytoplankton contained high concentrations of Ca, P, Mn, Fe, Zn, Al, Ba, and Pb. The phytoplankton of the Mocajuba estuary is rich in Fe (2,967-84,750 µg g-1), while those from the Pará is rich in Al (1,216-15,389 µgg-1), probably reflecting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sediments; Trace metals; Plankton; Surface water.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000400012

Geochemical behavior of heavy metals in differents environments in Rodrigo de Freitas lagoon - RJ/Brazil
Provedor de dados: 42
Autores: Fonseca,Estefan M; Baptista Neto,José A; Fernandez,Marcos A; Mcalister,John; Smith,Bernard.
The accelerated urbanisation without a planning, brought several environmental problems to Rio de Janeiro coastal zone, especially in areas such as Rodrigo de Freitas lagoon, which receives a great amount of untreated sewage every day. To assess the nature, potentially sources and extent of heavy metal pollution in the lagoon, sediments from the surrounding streets, from the entrance of the main canal that drains to the lagoon and from the bottom of the lagoon were collected and analysed by a modified selective extraction procedure in order to study the geochemical partitioning and bioavailability of Zn, Cu, Cr, Ni and Pb in these three compartments. The present study verified an increase in the Cu, Pb and Zn concentrations in the north of the Rodrigo de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Rodrigo de Freitas lagoon; Sediments.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000200008

Limnology of the largest multi-use artificial reservoir in NE Brazil: The Castanhão Reservoir, Ceará State
Provedor de dados: 42
Autores: LACERDA,LUIZ D.; SANTOS,JANAÍNA A.; MARINS,ROZANE V.; SILVA,FRANCISCO A.T.F. DA.
Abstract This work reviews the limnology of the largest multi-use reservoir in NE Brazil, the Castanhão Reservoir in Ceará State, during 5 years of an extended drought when the reservoir’s volume decreased from 88% to about 30%. Major physical and chemical parameters of the water column, phytoplankton community, trophic state and sediment geochemistry were monitored, as well as the impact from extensive aquaculture. Water quality of the full reservoir was maintained due to hydrodynamics, which transport nutrients to the hypolimnion of a stratified water column, rendering an oligotrophic state to the reservoir, notwithstanding the large nutrient inputs from aquaculture and irrigated agriculture. However, with the extension of the drought period, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrochemistry; Hydrodynamics; Nutrients; Water quality; Sediments; Aquaculture.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502073

Evaluation of the use of Leptodactylus ocellatus (Anura: Leptodactylidae) frog tissues as bioindicator of metal contamination in Contas River, Northeastern Brazil
Provedor de dados: 42
Autores: CORREIA,LÍVIA O.; SIQUEIRA JÚNIOR,SÉRGIO; CARNEIRO,PAULO L.S.; BEZERRA,MARCOS A.
This paper presents a study on the viability of the use of tissues of the Leptodactylus ocellatus species (Anura Leptodactylidae) as a bioindicator of metal pollution. The study is based on the determination and correlation of the concentrations of manganese, chromium, zinc, nickel, copper and iron in sediments and tissues (skin, muscles and viscera) of the frog Leptodactylus ocellatus collected in the middle region of the Contas River in Bahia, Brazil. The highest levels of the metals studied were found in the viscera of this animal. In this tissue, a higher correlation of the concentration of these metals with those found in sediments was also observed. The concentrations of elements found in the skin and muscles of these amphibians have revealed no...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leptodactylus ocellatus; Bioindicators; Sediments; Metals; Contas River.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401549

Application of modified simplex on the development of a preconcentration system for cadmium determination in sediments, food and cigarettes
Provedor de dados: 42
Autores: SANTOS,QUEILA O.; MORENO,ISLANIA; SANTOS,LEANDRO DOS; SANTOS,ALDENOR G.; SOUZA,VALDINEI S.; BEZERRA,MARCOS A.
A modified simplex algorithm was used to optimize a system of preconcentration for cadmium determination in samples of sediments, cigarettes and food using flame atomic absorption spectrometry. The preconcentration system is based on the sorption of cadmium in a minicolumn packed with Amberlite XAD-2 resin functionalized with 3,4-dihydroxybenzoic acid (DHB). The optimized variables were pH and sampling flow rate and the optimum conditions found for these variables were, respectively 8.7 and 8.8 mL min-1. The developed system showed a preconcentration factor of 15.3, detection limit of 0.49 µg L-1, quantification limit of 1.65 µg L-1 and precision expressed as relative standard deviation (% RSD, n=10) of 5.9. The accuracy of the method was checked by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Simplex optimization; Preconcentration; Cadmium; Sediments; Cigarettes; Food.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300791

Stonemeal of amazon soils with sediments from reservoirs: a case study of remineralization of the tucuruí degraded land for agroforest reclamation
Provedor de dados: 42
Autores: THEODORO,SUZI H.; LEONARDOS,OTHON H.; ROCHA,EDUARDO; MACEDO,IRIS; REGO,KLEYSSON G.
This study suggests the employment of accumulated sediments in the reservoir of Tucuruí (Pará /Brazil) to remineralize the surrounding degraded soils. The approach was based on the principles of stonemeal technology. It suggests that the soil can be rejuvenated by crushed rocks rich in macro and micronutrients. Removal of the sediments for agricultural use will bring benefits to family farmers and increase the life cycle of the reservoir and, therefore, energy generation. Geochemical data on retained sediments, soils and rocks in the area of influence of the reservoir were evaluated regarding nutrient transport mechanisms and soil-fertility potential. Results show that sediments from the reservoir contain nutrients levels at least one order of magnitude...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geochemistry; Sediments; Reservoir; Agroforestry; Sustainable development.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000100023

Inventary of the Sponge Fauna of the cemitério Paleolake, Catalão, Goiás, Brazil
Provedor de dados: 42
Autores: Machado,Vanessa de Souza; Volkmer-Ribeiro,Cecilia; Iannuzzi,Roberto.
The Cemitério Paleolake, Catalão, Goiás, is a lacustrine deposit that is rich in spicules of continental sponges. These spicules, which are present in three sections (1-3), were analyzed for the taxonomic identification of the species in order to reconstruct the late Quaternary palaeoenvironment. An indigenous assemblage of lentic sponges was found, consisting of Metania spinata (Carter 1881), Dosilia pydanieli Volkmer-Ribeiro (1992), Radiospongilla amazonensis Volkmer-Ribeiro and Maciel (1983), Trochospongilla variabilis Bonetto and Ezcurra de Drago (1973), Corvomeyenia thumi (Traxler 1895), Heterorotula fistula Volkmer-Ribeiro and Motta (1995), plus Corvoheteromeyenia australis (Bonetto and Ezcurra de Drago 1966), which here has its first record in an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado Biome; Continental sponges; Quaternary paleointerpretations; Sediments; Spicules.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100004

Structural and compositional dynamics of macroinvertebrates and their relation to environmental variables in Buenaventura Bay
Provedor de dados: 50
Autores: Gamboa-García,Diego Esteban; Duque,Guillermo; Cogua,Pilar.
ABSTRACT Buenaventura bay is characterized by a great dynamic of environmental variables. There is descriptive information concerning the distribution of macroinvertebrates in the bay and its habitat, however it is necessary to document on its dynamics in relation to environmental variables. The objective of the present work was to determine the espatio-temporal variation in the structure and composition of macroinvertebrates and their relationship with the environmental variables. Four sampling (April-June-September November) were carried out throughout 2015, in four stations (Estuary River-Internal Estuary-External Estuary-Marine Estuary). At each station three samples of sediments, physicochemical variables of the water and macroinvertebrates were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Epibenthonic Invertebrates; Tropical Estuary; Sediments.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612018000100067

Analysis of bacterial communities and characterization of antimicrobial strains from cave microbiota
Provedor de dados: 58
Autores: Yasir,Muhammad.
Abstract In this study for the first-time microbial communities in the caves located in the mountain range of Hindu Kush were evaluated. The samples were analyzed using culture-independent (16S rRNA gene amplicon sequencing) and culture-dependent methods. The amplicon sequencing results revealed a broad taxonomic diversity, including 21 phyla and 20 candidate phyla. Proteobacteria were dominant in both caves, followed by Bacteroidetes, Actinobacteria, Firmicutes, Verrucomicrobia, Planctomycetes, and the archaeal phylum Euryarchaeota. Representative operational taxonomic units from Koat Maqbari Ghaar and Smasse-Rawo Ghaar were grouped into 235 and 445 different genera, respectively. Comparative analysis of the cultured bacterial isolates revealed distinct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caves; 16S ribosomal RNA; Microbiota; Antimicrobial; Sediments.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000200248

Bacterial diversity in relatively pristine and anthropogenically-influenced mangrove ecosystems (Goa, India)
Provedor de dados: 58
Autores: Fernandes,Sheryl Oliveira; Kirchman,David L.; Michotey,Valérie D.; Bonin,Patricia C.; LokaBharathi,P.A.
To appreciate differences in benthic bacterial community composition at the relatively pristine Tuvem and the anthropogenically-influenced Divar mangrove ecosystems in Goa, India, parallel tag sequencing of the V6 region of 16S rDNA was carried out. We hypothesize that availability of extraneously-derived anthropogenic substrates could act as a stimulatant but not a deterrent to promote higher bacterial diversity at Divar. Our observations revealed that the phylum Proteobacteria was dominant at both locations comprising 43-46% of total tags. The Tuvem ecosystem was characterized by an abundance of members belonging to the class Deltaproteobacteria (21%), ~ 2100 phylotypes and 1561 operational taxonomic units (OTUs) sharing &amp;gt; 97% similarity. At...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteria; Denitrification; Diversity; Mangroves; Sediments.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000400006

Arqueobotánica del museo nacional de las culturas, Ciudad de México
Provedor de dados: 32
Autores: Galván Escobedo, Iris Grisel.
El Museo Nacional de las Culturas  (MNC) ubicado en el centro histórico de la ciudad de México, es un edificio que fue construido en 1734  sobre los  restos de la antigua ciudad de México -Tenochtitlán habitada por los mexicas (1324-1521). En el MNC se realizaron excavaciones arqueológicas con el objeto de recuperar información histórica relacionada con el sitio,  tendientes a una restauración integral del edificio y su posterior adecuación museográfica. De los trabajos arqueológicos  se derivó esta tesis que tuvo como finalidad recuperar los restos vegetales contenidos en los depósitos sedimentológicos de las excavaciones arqueológicas, para establecer las condiciones paleoecológicas de la región  y el posible uso de plantas. Se analizaron 50 muestras de...
Palavras-chave: Arqueobotánica; Sedimentos; Semillas; Maderas; Polen; Archaeobotany; Sediments; Seeds; Wood; Pollen; Maestría; Botánica.
Ano: 2010
URL: http://hdl.handle.net/10521/142

Arqueobotánica del museo nacional de las culturas, Ciudad de México
Provedor de dados: 32
Autores: Galván Escobedo, Iris Grisel.
El Museo Nacional de las Culturas  (MNC) ubicado en el centro histórico de la ciudad de México, es un edificio que fue construido en 1734  sobre los  restos de la antigua ciudad de México -Tenochtitlán habitada por los mexicas (1324-1521). En el MNC se realizaron excavaciones arqueológicas con el objeto de recuperar información histórica relacionada con el sitio,  tendientes a una restauración integral del edificio y su posterior adecuación museográfica. De los trabajos arqueológicos  se derivó esta tesis que tuvo como finalidad recuperar los restos vegetales contenidos en los depósitos sedimentológicos de las excavaciones arqueológicas, para establecer las condiciones paleoecológicas de la región  y el posible uso de plantas. Se analizaron 50 muestras de...
Palavras-chave: Arqueobotánica; Sedimentos; Semillas; Maderas; Polen; Archaeobotany; Sediments; Seeds; Wood; Pollen; Maestría; Botánica.
Ano: 2010
URL: http://hdl.handle.net/10521/142

Impacto del fuego sobre la erosión hídrica y el escurrimiento superficial, utilizando lluvia simulada: Caso de estudio Volcán Pelado, Distrito Federal, México
Provedor de dados: 32
Autores: Ramírez Cruz, Maidali Erizabeth.
Los incendios forestales, además de afectar la calidad del aire y la cubierta vegetal,  provocan cambios importantes en las propiedades hidrológicas del suelo, aceleran el  proceso de erosión y contaminan por sedimentación. Sin embargo, en México, la  información relacionada con los incendios esta más enfocada a estudiar y documentar el  impacto ambiental sobre la calidad del aire y la cubierta vegetal, sin ahondar en los efectos  sobre el suelo , el escurrimiento superficial y la producción de sedimentos.  Por tal motivo,  el objetivo de este trabajo fue evaluar la severidad de la quema sobre la infiltración del  agua, la producción de escurrimiento superficial y sedimentos. Se evaluaron doce  tratamientos derivados de las cuatro severidades de quema...
Tipo: Tesis
Palavras-chave: Severidad de quema; Sedimentos; Escurrimiento superficial; Lluvia simulada; Doctorado; Hidrociencias; Fire severity; Sediments; Surface runoff; Simulated rain.
Ano: 2009
URL: http://hdl.handle.net/10521/1292

Эколого-геологическая характеристика донных осадков Одесского залива
Provedor de dados: 13
Autores: Беркович, О. О.; Какаранза, С. Д.; Никулин, В. В.
Приводятся результаты исследований, выполненных в районе Одесского залива в 1993г.  Особенности поведения различных групп химических элементов в донных отложениях прибрежной зоны г. Одессы рассмотрены на примере 15 микроэлементов, содержания которых определялись методом атомной абсорбции. Выделение парагенетических ассоциаций элементов было проведено на основе корреляционного, факторного и кластерного анализов. В результате  была  показана зависимость пространственного распределения и накопления рассматриваемых элементов от формы поступления их с речным стоком, условий седиментации и от закономерностей локализации различных литологических разностей донных отложений. Так, максимумы содержания в песчаных фракциях выявлены у Cr и V; максимальные концентрации...
Tipo: Journal Contribution
Palavras-chave: Элементы-токсиканты; Донные отложения; Одесский залив; Форма миграции; Парагенетические ассоциации; Elements-toxicants; Sediments; Paragenic groups; Odessa Bay Sediments Toxicants.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/587

Past and present platinum contamination of a major European fluvial-estuarine system: Insights from river sediments and estuarine oysters
Provedor de dados: 5
Autores: Abdou, M.; Schaefer, J.; Cobelo-garcia, A.; Neira, P.; Petit, J. C. J.; Auger, Dominique; Chiffoleau, Jean-francois; Blanc, Gerard.
Platinum Group Metals (PGM) are modern, technologically relevant elements for which (i) the anthropogenic cycle has outcompeted the natural cycles and (ii) environmental behavior, fate and impact are still widely unknown. Stripping voltammetry was used for accurate determinations of platinum (Pt) in historical records of river sediments and estuarine oysters from the Gironde fluvial-estuarine continuum (SW France) comprising the Lot River. Sediment cores from the Lot River, dated from 1952 to 2001, showed past Pt contamination due to former industrial (smelter) activities in the Lot River watershed. These samples revealed the phasing-out of a historical Pt contamination with Pt/Th (Thorium) values of 11 × 10− 5 ± 0.79 × 10− 5 for the deepest part of the...
Tipo: Text
Palavras-chave: Platinum; Sediments; Wild oysters; Bioaccumulation.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00311/42177/41478.pdf

Metal concentrations in sediment and Nereis diversicolor in two Moroccan lagoons: Khnifiss and Oualidia
Provedor de dados: 5
Autores: Idardare, Zaina; Chiffoleau, Jean-francois; Moukrim, A; Alla, A; Auger, Dominique; Lefrere, L; Rozuel, Emmanuelle.
Metal concentrations were measured monthly during an annual cycle (December 2004 to January 2006) in the tissues of Nereis diversicolor ragworms and sediment from two Moroccan Atlantic coastal lagoons: Oualidia in the north, situated in a highly industrialised urban area and Khnifiss in the south, far from anthropogenic influences. Relatively high levels of Zn, Ag and Cd were found in the sediment of Oualidia lagoon, while Ni concentrations were shown to be high at Khnifiss. The significant metal levels at Oualidia are a result of industrial and urban discharges, coupled with discharges from adjacent phosphate ore processing plants. Trace metal concentrations in worms vary according to season; they are usually high in winter and spring, in relation to the...
Tipo: Text
Palavras-chave: Morocco; Coastal lagoons; Sediments; Nereis diversicolor; Metals.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6127.pdf

Biological availability of sediment-bound trace metals.
Provedor de dados: 5
Autores: Luoma, S.
It has been established that direct uptake of (at least some) trace metals from sediments contributes to metal concentrations in benthic organisms. Important controls on metal uptake from sediment are the concentration of the exposure, the partitioning of the metals among components of the sediment, and the redox potential of the sediment. Important problems in ecology, physiology, geochemistry and biogeochemistry remain unresolved, however, and a concentrated interdisciplinary research effort will be necessary before a complete understanding of the fate and impact of sediment-bound metals will be possible.
Tipo: Text
Palavras-chave: Bioaccumulation; Benthos; Food webs; Biogeochemical cycle; Sediments; Availability; Trace metals.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1302.pdf

Diversité phylogénétique et fonctionnelle des communautés microbiennes incultivées des sédiments marins de la marge de Sonora, Bassin de Guaymas (Golfe de Californie)
Provedor de dados: 5
Autores: Vigneron, Adrien.
At continental margins, and more particularly in cold seep areas, microbial and animal communities were locally detected at the surface of the sediments. These communities grow using reduced chemical compounds (H2S, Methane, COZ ...) contained in the percolated cold fluids and produced by both geological and microbial processes. ln order to study microbial community diversity in these ecosystems and their role in the environment as well as to understand the environmental factors influencing the distribution and ecophysiology of these communities, surface (0-20 cmbsf) but also deeper (&lt;9 mbsf) sediments were collected at the Sonora Margin. Microbial communities have been studied using various molecular, cultural and microscopy approaches. This research...
Tipo: Text
Palavras-chave: Fluides froids; Marge de Sonora; Bassin de Guaymas; Diversité moléculaire; Communautés microbiennes; Archaea; Bacteria; Méthanogènes; Methanogens; Microbial communities; Molecular diversity; Guaymas Basin; Sonora Margin; ANME; SRb; Methane; Sediments; Cold seeps.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00498/60956/64359.pdf

A relationship between deep-sea benthic oxygen demand and oceanic primary productivity
Provedor de dados: 5
Autores: Christensen, Jp.
A diagenetic model of porewater O-2 was used to examine the relationship between organic carbon flux to the sediments and benthic oxygen demand (BOD). The model predicted that the organic carbon influx to sediments balances BOD as long as sediments are oxygenated. The critical rate occurs when O-2 at infinite depth disappears. With influxes exceeding the critical rate, the O-2 flux into the sediments via molecular diffusion can not consume all incoming organic matter, and anaerobic conditions result in BOD underestimating the carbon influx. Given that low rates of deep-sea BOD approximate the carbon influx below 9 g.C.m(-2).y(-1), a significant multilinear regression was found between published BOD, primary productivity (P-p, both in g.C.m(-2).y(-1))(,)...
Tipo: Text
Palavras-chave: Fonds marins; Oxygène; Production primaire; Respiration; Sédiments; Deep-sea; Oxygen; Primary productivity; Respiration; Sediments.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00325/43578/44046.pdf

Development of a Resonant Microwave Sensor for Sediment Density Characterization
Provedor de dados: 5
Autores: Mansour, Rassoul; Rioual, S.; Lescop, B.; Talbot, P.; Abboud, M.; Farah, W.; Tanné, G.
In this study, a sensor based on the development of a planar antenna immersed in sediments dedicated to water content monitoring in this type of material is proposed and experimentally validated. It is produced by a conventional Printed Circuit Board (PCB) manufacturing process on a double-sided metalized FR4 substrate. The sensitivity of the sensor is ensured by the variation of the real part of the complex dielectric permittivity of sediments with water content at around 1 GHz. As shown, in this frequency range, electrode polarization and Maxwell–Wagner polarization e ects become negligible, leading to only a bulk water polarization sensitivity. The sensor operates in the reflection mode by monitoring the variation of the resonant frequency as a function...
Tipo: Text
Palavras-chave: Resonant sensor; Water content; Dielectric characterization; Microwave; Antenna; Sediments.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00610/72167/70939.pdf

Isolating climatic and paleomagnetic imbricated signals in two marine cores using principal component analysis
Provedor de dados: 5
Autores: Valet, Jean-pierre; Moreno, Eva; Bassinot, Franck; Johannes, Lola; Dewilde, Fabien; Bastos, Tiago; Lefort, Apolline; Venec-peyre, Marie-therese.
High resolution measurements of climatic and magnetic parameters have been performed on two cores from the eastern China Sea and the western Caroline Basin. On both cores, magnetic parameters show a strong imprint of climatic changes but the absence of relationship between the inclination and the bulk density indicates that the directional changes do not depend on lithology. A weak 100 ka cycle is present in the China sea inclination variations, but this period is not in phase with the orbital eccentricity and thus not relevant. All normalization parameters yielded similar estimates of relative paleointensity (RPI), but we have noticed the persistence of climatic components in the signal. Principal Component Analysis (PCA) applied to different parameters...
Tipo: Text
Palavras-chave: Magnetization; Paleointensity; Paleomagnetism; Sediments.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00227/33818/32481.pdf

Interrelations entre des communautes mixtes de bacteries anaerobies isolees de sediments marins
Provedor de dados: 5
Autores: Marty, D.
The mineralization of cellulose was examined in mono and cocultures of marine anaerobic bacteria (cellulolytic bacteria, fermentative non-cellulolytic bacteria and methane-producing bacteria). These studies displayed interactions between these groups of microorganisms: inhibition relationships (inhibition of methanogens during active growth of fermentative bacteria) and syntrophic relationships (growth of fermentative non-cellulolytic bacteria depended on metabolites produced by cellulolytic bacteria; increased in rate of cellulose hydrolysis in presence of fermentative non-cellulolytic bacteria; interspecies H sub(2) transfer reaction between fermentative bacteria and methane-producing bacteria).
Tipo: Text
Palavras-chave: Biogeochemistry; Sedimentation; Sediments; Fermentation; Mineralization; Cellulose; Methanogenesis; Interspecific relationships; Anaerobic bacteria.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-948.pdf

Concentrations and origin of polycyclic aromatic hydrocarbons in sediments of the Middle Adriatic Sea
Provedor de dados: 5
Autores: Mandic, Jelena; Pavela Vrancic, Maja.
A total of 208 polycyclic aromatic compounds and their substituted homologues were investigated on eight stations along Croatia-Italy transect in the Middle Adriatic. PAC concentrations were higher in the coastal area than in the open sea area. The highest PAC concentrations were measured in the vicinity of the industrial harbor of Split while the lowest concentrations were observed on stations located in the open sea area. Polycyclic aromatic hydrocarbons were dominant group of compounds on each investigated station with contributions in total PAC concentration of more than 85%. S-PAH concentrations were higher than O-PAH concentration in each sample and tend to decrease as the distance from the coast increased. Contributions of O-PAH in total PAC...
Tipo: Text
Palavras-chave: Polycyclic aromatic compounds; PAH; Sediments; Diagnostic ratios; Marine pollution; Adriatic Sea.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00395/50607/51319.pdf

Contamination of the Bay of Biscay by polycyclic aromatic hydrocarbons (PAHs) following the T/V "Erika" oil spill
Provedor de dados: 5
Autores: Tronczynski, Jacek; Munschy, Catherine; Moisan, Karine; Guiot, Nadege; Truquet, Isabelle; Olivier, Nathalie; Men, Sophie; Furaut, Audrey.
An investigation was carried out into the PAH chemical contamination resulting from the "Erika" tanker fuel spillage of December 1999 along the French coast of the Bay of Biscay. A qualitative and quantitative assessment was conducted of this contamination in water, suspended particulate matter, sediments, and in intertidal molluscs. The chemical composition of PAHs in pre-spill and post-spill samples was determined and used to distinguish the "Erika's" fuel as the source of PAHs in the coastal environment of the Bay of Biscay. Changes in concentrations of PAHs were also assessed. The GC-MS analysis made it possible to identify and quantify parent unsubstituted PAHs, alkyl-substituted PAHs (C-PAH) and sulfur heterocycle unsubstituted and alkyl substituted...
Tipo: Text
Palavras-chave: The "Erika" oil spill; North East Atlantic; Marine molluscs; Sediments; Suspended particulate matter; Water; Chemical contamination.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-401.pdf

Identification et quantification des pigments chlorophylliens et caroténoïdes des sédiments marins : un protocole d'analyse par HPLC
Provedor de dados: 5
Autores: Brotas, V; Plantecuny, Mr.
A HPLC protocol is described which permits analysis of the pigment composition of coastal and intertidal sediments. The HPLC technique has been extensively applied to phytoplankton pigments for fifteen years. Papers dealing with living benthic microphytic populations have been more rare, due to complexity existing in the sediment surface, where pigments (chlorophylls and carotenoids) from several taxonomic groups of microalgae are mixed with degraded pigments from senescent phytoplankton cells and macrophytic material. The present paper describes in detail a protocol adapted from Kraay et al. (1992), which allows a good discrimination of photosynthetic pigments of microphytobenthos communities. The following procedure is recommended. Sediment samples are...
Tipo: Text
Palavras-chave: Plants pigments; Sediments; Protocol; HPLC.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20730/18367.pdf

Analysis of light hydrocarbons in marine sediments by headspace technique: Optimization using design of experiments
Provedor de dados: 5
Autores: Donval, Jean-pierre; Charlou, Jean-luc; Lucas, L.
Headspace technique is a common method to analyze light hydrocarbons in deep marine sediments. The use of an automatic headspace sampler instead of a manual injection is the guarantee for a better repeatability and furthermore it is less time consuming. But to increase the sensitivity and therefore, to achieve a better detection limit, it is necessary to optimize the automatic headspace sampler parameters. The theory of design of experiments was applied here by studying them. As a response, methane, which is an important gas in marine sediments, was chosen for its short analysis time. Regarding the parameters for automatic headspace sampler, eight variables were selected and then, a screening of them was carried out with a fractional factorial design to...
Tipo: Text
Palavras-chave: Design of experiments; Headspace technique; Gas; Sediments.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6235.pdf

Seabed image acquisition and survey design for cold water coral mound characterisation
Provedor de dados: 5
Autores: Lim, Aaron; Kane, Adam; Arnaubec, Aurelien; Wheeler, Andrew J.
Cold-water coral (CWC) habitats are commonly regarded as hotspots of biodiversity in the deep-sea. However, a standardised approach to monitoring the effects of climate change, anthropogenic impact and natural variability through video-surveying on these habitats is poorly-established. This study is the first attempt at standardising a cost-effective video-survey design specific to small CWC mounds in order to accurately determine the proportion of facies across their surface. The Piddington Mound of the Moira Mounds, Porcupine Seabight, offshore Ireland has been entirely imaged by downward-facing video in 2011 and 2015. The 2011 video data is navigated into a full-mound, georeferenced video mosaic. A quadrat-based manual classification of this video...
Tipo: Text
Palavras-chave: Cold water corals; Mounds; Video survey design; Sediments; Habitat mapping.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00403/51482/53728.pdf

Polychaete tube walls as zonated microhabitats for marine bacteria.
Provedor de dados: 5
Autores: Reichardt, W.
The predominantly anoxic, sulfide-rich sandy sediment of a shallow lagoon at Kiel Fjord was densely inhabited by the polychaete worm Nereis diversicolor (280 cm super(3) m super(-2) of biomass volume). Burrow walls which contrasted by their brown coloration of at least 1.5 mm thickness with the bulk of the reduced black sediment, made up for 6% of the total volume of the 10 cm cores investigated. Only the uppermost mm of the internal surface layer contained detectable O sub(2). As a result of the build up of internal redox gradients, CO sub(2) dark fixation was activated in the burrow walls (by a factor of approximately equals 2). Assays of ribulose-biphosphate carboxylase activities and viable counts of potentially chemoautotrophic bacteria in different...
Tipo: Text
Palavras-chave: Nereis diversicolor; Polychaeta; Bacteria; Microorganisms; Carbon cycle; Tube dwellers; Carbon fixation; Burrows; Bioturbation; Sediments.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-990.pdf

Holocene coastal changes and infilling of the La Perroche marsh (French Atlantic coast)
Provedor de dados: 5
Autores: Clave, B; Masse, L; Carbonel, P; Tastet, Jp.
The La Perroche marsh is a small Holocene marsh on the south-western coast of the Oleron island (Bay of Biscay, France) presently occupied by a freshwater swamp and separated from the ocean by a continuous sand dune ridge. The study of its infill shows first basal conglomeratic deposits with calcareous pebbles on a Cenomanian rough substrate. The Holocene infill since 6000 years BP begins with a very fast sedimentation of sands. Then, the sedimentation becomes finer, with lagoonal to freshwater influences recorded by ostracods. The distribution of these deposits inside the marsh is asymmetric, with a thick sandy-gravely layer in the eastern part and a succession of sands, clays and organic layers in the western part. Communication with the sea is episodic,...
Tipo: Text
Palavras-chave: Changements côtiers; Marais maritime; Holocène; Ostracodes; Sédiments; Coastal changes; Coastal salt marsh; Holocene; Ostracods; Sediments.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43349/42877.pdf

Influence of sediment characteristics on shrimp physiology: pH as principal effect
Provedor de dados: 5
Autores: Lemonnier, Hugues; Bernard, E; Boglio, E; Goarant, Cyrille; Cochard, Jean-claude.
Penaeid shrimp reared in earthen ponds are exposed to sediment, which can, in some instances, induce a stress. In seawater, the osmoregulatory capacity (hyporegulation) is a useful tool to compare the physiological condition of shrimp exposed to various stressors. By keeping some shrimp in cages at different locations of a single pond heterogeneous in terms of sediment quality, it was possible, using osmotic pressure (OP), to identify some locations where the stress was maximum and some others where it was minimum. Simultaneously, sediment samples were taken and analysed in order to evaluate some physico-chemical parameters that could be related to the stress observed in the shrimps kept in the cages. This approach allowed to show a significant positive...
Tipo: Text
Palavras-chave: PH; Sediments; Stress; Osmotic pressure; Shrimp physiology.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-1866.pdf

Apports et distribution des résidus organochlorés à haut poids moléculaire dans la rade de Brest (milieu marin semi-fermé)
Provedor de dados: 5
Autores: Marchand, Michel; Caprais, Jean-claude; Cossonmannevy, Ma; Moriniere, P.
The aim of this work is to study the input, transfer and distribution processes of chlorinated insecticides (lindane, DDT) and PCB residues in a semi-closed coastal marine environment. Measurements are made in sea water, rain water and sediment samples. Distribution coefficients between sea water and sediment are determined for several organochlorine insecticide and PCB compounds. The results show an important transfer of chlorinated residues from the atmosphere to the marine environment. The highest residue levels in the sediments are observed near other urban and industrial pollution sources. Analyses of mussels show that this mollusc can be used as a biological indicator of sea water pollution. Concentration factors are determined for lindane,...
Tipo: Text
Palavras-chave: Organochlorés; Eau; Sédiments; Matière vivante; Rade de Brest; Organochlorine; Water; Sediments; Biota; Rade de Brest.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/00114/22481/20162.pdf

Observations préliminaires recueillies dans l'exécution des programmes entrepris par la station biologique de Roscoff
Provedor de dados: 5
Autores: Bergerard, S.
We have tried to expose here the first observations on the basis of , previous knowledge and studies in progress when the wreck arrived, in particulary of benthic Populations Dynamics by the workers of the Biological Station. These results, still very fragmentary, allow never the less to definite the programs required for the second phase, essentially on the populations of fine deposits of the Morlaix and Lannion bays.
Tipo: Text
Palavras-chave: Pollution; Hydrocarbures; Amoco Cadiz; Sédiments; Phytoplancton; Macrobenthos; Meiobenthos; Microbenthos; Baie de Morlaix; Baie de Lannion; Pollution; Hydrocarbons; Amoco Cadiz; Sediments; Phytoplancton; Macrobenthos; Meiobenthos; Microbenthos; Morlaix Bay; Lannion Bay.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/00306/41725/40936.pdf

Marine pollution: Let us not forget beach sand
Provedor de dados: 5
Autores: Galgani, Francois; Ellerbrake, Katrin; Fries, Elke; Goreux, Chantal.
Background: Assessing the chemical or bacterial contamination in marine waters and sediments is a very common approach to evaluate marine pollution and associated risks. However, toxicity and organic pollution of beach sands have not yet been considered, except in adjacent waters. In the present study, the toxicity and the chemical contamination of natural beach sands collected 20 m from the shoreline at two sites located on the Mediterranean Sea (Marseille and La Marana, Corsica) were studied. Results: Up to 16.93% (net percentage) abnormal or dead larvae was observed in elutriates prepared from the urban beach sand sample (Marseille); no significant toxicity was observed in the sample collected from the reference beach in La Marana. Results of Fourier...
Tipo: Text
Palavras-chave: Oyster larvae biotests; Sediments; Infrared spectroscopy; Gas chromatography-mass spectrometry; Microplastics; Polycyclic aromatic hydrocarbons; Mediterranean Sea; Bioavailability; Organic contaminants.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00353/46442/46186.pdf

Etude du comportement geochimique du fer dans l'estuaire de la Seine
Provedor de dados: 5
Autores: Guegueniat, P; Boust, D; Gandon, R; Hemon, G; Phillipot, J; Sanchez, J; Marin, P; Pieri, J.
This paper reports the study of iron geochemical behavior by the measurement of total iron, iron associated with mineral coat, and ratio FEII/FEIII. The results of total iron are exploited by normalisation with regard to aluminium and scandium.
Tipo: Text
Palavras-chave: River discharge; Sediments; Suspended particulate matter; Ion association; Iron; Geochemical cycle.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1301.pdf

Etude ecologique des vibrions du bassin d'Arcachon
Provedor de dados: 5
Autores: Marchand, Michel.
Water and sediment samples monthly collected from Arcachon Bay (Gironde, France) were examined during three years for the presence of marine vibrios. V. cholerae serotype 01 was never detected. On the other hand, the Eyre River and mouth contain non-agglutinating V. cholerae (127 strains) principally in water. The low temperatures slow their development down without stopping it completely. V. parahaemolyticus (257 strains) present in the same areas is particularly isolated from water when the aquatic medium temperature rises to 15 degree C. V. alginolyticus (638 strains) settles the whole Bay, except the river, in any season. The low temperatures promote growth of V. metschnikovii (203 strains) very tolerant towards salinity. V. anguillarum (46 strains)...
Tipo: Text
Palavras-chave: Vibrio metschnikovii; Vibrio anguillarum; Vibrio alginolyticus; Vibrio cholerae; Vibrio; Marine environment; Microorganisms; Sediments; Salinity effects; Temperature effects; Ecology; Water.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-998.pdf

Response of sedimentary processes to cyanobacteria loading
Provedor de dados: 5
Autores: Zilius, Mindaugas; De Wit, Rutger; Bartoli, Marco.
Sedimentation of pelagic cyanobacteria in dystrophic freshwater and oligohaline lagoons results in large inputs of labile organic matter (OM) to the benthos. We used an experimental approach to study the short-term impact of such phenomena on the benthic microbial community metabolism and on the nitrogen (N) fluxes across the sediment-water interface. We hypothesized an increase of respiratory activity, including N loss via denitrification and its recycling to the water column. Our results show that the incorporation within sediments of the settled bloom increases benthic bacterial activities. This is coupled to large DON and NH4+ effluxes, and to a comparatively smaller increase of N-2 production, while no significant effects were detected for the benthic...
Tipo: Text
Palavras-chave: Cyanobacteria; Organic matter; Sediments; Benthic metabolism; DON; Denitrification.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00354/46504/74457.pdf

Are trawl marks a good indicator of trawling pressure in muddy sand fishing grounds?
Provedor de dados: 5
Autores: Merillet, Laurene; Kopp, Dorothee; Robert, Marianne; Salaun, Michele; Mehault, Sonia; Bourillet, Jean-francois; Mouchet, Maud.
The development of the vessel monitoring system (VMS) in the recent years has offered high-resolution data to map the distribution and intensity of fishing activities and contributed to enhancing the potential identification of fishing impacts. However, impacts could vary at very small scale and the resolution of VMS data might not be fine enough. Other proxy could be used, such as trawl marks visible on the seabed observed by underwater video or side-scan sonar to evaluate small-scale trawling effort. In the Bay of Biscay, an underwater video survey of the Nephrops norvegicus fishing ground was conducted and provided environmental characteristics such as depth and number of trawl marks at 152 transects. The relevance of observed trawl marks as a...
Tipo: Text
Palavras-chave: Bay of Biscay; Fishing intensity; Sediments; Underwater video; Vessel monitoring system.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00410/52112/52854.pdf

Mercury transformations and exchanges in a high turbidity estuary: The role of organic matter and amorphous oxyhydroxides
Provedor de dados: 5
Autores: Laurier, Fabien; Cossa, Daniel; Gonzalez, Jean-louis; Breviere, Emily; Sarazin, G.
The speciation and partition of mercury in a macrotidal estuary (Seine estuary, France) was studied in order to explore the role of the high turbidity zone (HTZ) in mercury transfer to the adjacent coastal waters. Water and particles were analyzed to determine the concentrations of various mercury species, including monomethylmercury and the inorganic fraction. The exchangeable particulate mercury, which varies with salinity, and the mercury fraction associated with the amorphous oxyhydroxides were evaluated. The distribution of dissolved mercury species during early mixing suggests non-conservative behavior of organically bound mercury at the head of the estuary. Mercury in the particles covaried positively with suspended particulate matter concentrations...
Tipo: Text
Palavras-chave: Sediments; Biogenic thiols; Fluorescence detection; Seine estuary; Mercury.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-425.pdf

Effects of environmental conditions on the sessile existence of an estuarine sediment bacterium.
Provedor de dados: 5
Autores: Geesey, G; Salas, S; Mittelman, M.
A submerged glass coverslip technique was developed to determine dissolved organic nutrient uptake by adherent cells of a sediment isolate of Enterobacter cloacae . Cells which colonized the coverslips in swirling culture flasks during anaerobic growth remained firmly attached during manipulations employed to determine uptake of radiolabeled glucose by the adherent population. The attached cells were capable of a more rapid rate of glucose uptake than free cells. Lineweaver-Burk plots demonstrated different glucose uptake kinetics for the 2 cell populations. The data suggest that physiological changes occur in cells soon after they become attached to surfaces. These changes appear to enhance the metabolic activity of the adherent population.
Tipo: Text
Palavras-chave: Enterobacter cloacae; Adhesion; Glucose; Environmental effects; Bacteria; Sediments; Estuaries; Sessile species; Culture media; Metabolism; Dissolved oxygen; Microbiological analysis.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-967.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: 5
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

Abrupt climate changes for Iceland during the last millennium: Evidence from high resolution sea ice reconstructions
Provedor de dados: 5
Autores: Masse, Guillaume; Rowland, Steven J.; Sicre, Marie-alexandrine; Jacob, Jeremy; Jansen, Eystein; Belt, Simon T.
A high resolution account of Icelandic sea ice over the last millennium has been constructed using a novel proxy based on the presence in sediments of a biomarker (IP25) produced by sea ice algae. Comparison with historical sea ice records demonstrates a strong correlation between documented sea ice Occurrences and the IP25 proxy. An excellent agreement is also observed between the IP25 record and a diatom-based sea surface temperature reconstruction obtained from the same core and the Crowley and Lowery Northern Hemisphere temperature reconstruction. Using this approach, we provide new historical sea ice data for periods where records are scarce or absent and evidence for abrupt changes to sea ice and/or climate conditions around Iceland during the Little...
Tipo: Text
Palavras-chave: Highly branched isoprenoid alkenes; Sea ice; Iceland; Sediments.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00237/34839/33273.pdf

Siliceous productivity changes in Gulf of Ancud sediments (42 degrees S, 72 degrees W), southern Chile, over the last similar to 150 years
Provedor de dados: 5
Autores: Rebolledo, Lorena; Gonzalez, Humberto E.; Munoz, Praxedes; Iriarte, Jose L.; Lange, Carina B.; Pantoja, Silvio; Salamanca, Marco.
We evaluated changes in siliceous export production and the source of organic matter preserved in sediment core MD07-3109H recovered from the Gulf of Ancud, Chiloe Inner Sea (42 degrees S, 72 degrees W, water column depth: 328 m), southern Chile. We analyzed the abundance of siliceous microfossils (diatoms, silicoflagellates, sponge spicules, Chrysophyte cysts, phytoliths), geochemical proxies (weight percent silicon %Si(OPAL), organic carbon, total nitrogen. C/N molar), and sediment stable isotopes (delta(13)C(org), delta(15)N). Chronology based on (210)Pb and (14)C provided an accumulated age of 144 years at the base of the core. Sediments of core MD07-3109H are predominantly marine in origin, averaging delta(13)C(org)=-20.75 parts per thousand+0.82,...
Tipo: Text
Palavras-chave: Productivity; Siliceous microfossil; Geochemical proxies; Sediments; Gulf of Ancud; Chile.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00214/32520/30999.pdf

Platinum in sediments and mussels from the northwestern Mediterranean coast: temporal and spatial aspects
Provedor de dados: 5
Autores: Abdou, Melina; Schafer, Jorg; Hu, Ruoyu; Gil-diaz, Teba; Garnier, Cedric; Brach-papa, Christophe; Chiffoleau, Jean-francois; Charmasson, Sabine; Giner, Franck; Dutruch, Lionel; Blanc, Gerard.
Platinum (Pt) is considered a Technology Critical Element (TCE) and an emerging metallic contaminant with increasing release into the environment. Gaps in knowledge and understanding of environmental levels, fate and effects of Pt still exist, especially in the marine environment. This work presents Pt concentrations in the northwestern Mediterranean coast including: (i) temporal variability from sediment cores and farmed mussels in the Toulon Bay (historically affected by intense human activities) and (ii) spatial distribution from recent wild mussels collected along ∼ 300 km coastline with contrasting ecosystems (including natural reserves), quantified using voltammetry and inductively coupled plasma-mass spectrometry. The historical (&gt; 100 years)...
Tipo: Text
Palavras-chave: Platinum; Sediments; Mussels; Biomonitoring; Mediterranean coast.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00460/57134/59055.pdf

Sulfate-reducing bacteria [rom mangrove swamps II : Their ecology and physiology
Provedor de dados: 5
Autores: Bharathi, Pal; Oak, S; Chandramohan, D.
Sulfate-reducing bacteria (SRB) have been enumerated and physiologically characterized in three mangrove stations along the Zuari estuary. The substrates for counting were lactate, acetate, propionate, butyrate and benzoate. Benzoate oxidizing SRB were widespread and occurred in numbers up to 6.62 x 10(3)/g dry sediment. The next highest in number were lactate utilizing SRB. On an average there were more propionate and butyrate utilizers than acetate utilizers. While Agasaim at the mouth of the estuary harboured highest number of lactate oxidizers, none were detected at Mirabaug upstream during the samplings. The SRB shared many characteristics with Desulfovibrio desulfuricans, D. desulfuricans aestuarii, D. salexigens, Desulfotomaculum orientis, D....
Tipo: Text
Palavras-chave: Bactéries; Sulfato-réductrices; Estuaire; Sédiments; Mangrove; Mangrove-Bacteria; Sulfate-reducers; Estuary; Sediments.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00323/43395/43103.pdf

Aliphatic hydrocarbons and triterpenes of the Congo deep sea fan
Provedor de dados: 5
Autores: Mejanelle, Laurence; Riviere, Beatrice; Pinturier, Laurence; Khripounoff, Alexis; Baudin, Francois; Dachs, Jordi.
Hydrocarbons were analyzed in sediments from the Congo River deep-sea fan, from the Congo River, and in sinking particles collected by sediment traps 40 m above the sediment. Studied sites encompassed three lobes of decreasing age of formation along the canyon: sites A, F and C and a another lobe system, disconnected from the active channel since 4 ka, Site E. Terrestrial long-chain odd n-alkanes were dominant in all sediments of the lobe system. Unsaturated terpenoids sourced by higher plants, such as gammacerene, lupene, ursene and oleanene, were also detected. At site C, characterized by high accumulation rates (10–20 cm yr−1), the organic matter spends less time in the oxic layer than at other sites and high phytadiene concentrations (10 to 17 μg...
Tipo: Text
Palavras-chave: Congo fan; Hydrocarbons; NAH; Hopanes; Hopenes; Sediments; Turbidite system.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00388/49902/50472.pdf

High-resolution facies zonation within a cold-water coral mound: The case of the Piddington Mound, Porcupine Seabight, NE Atlantic
Provedor de dados: 5
Autores: Lim, Aaron; Wheeler, Andrew J.; Arnaubec, Aurelien.
Framework-forming cold-water corals (CWC's) such as Lophelia pertusa and Madrepora oculata generate positive topographic features on the seabed called CWC mounds. In the North East Atlantic, CWC mounds have been studied in detail and reveal heterogeneous spatial on-mound organisation of coral patches. Many of these studies are limited by a paucity of remotely-sensed and video imagery at an appropriate resolution and coverage. This study is the first attempt to video mosaic an entire CWC mound (the Piddington Mound of the Moira Mounds, Porcupine Seabight, Irish margin). The mosaic is divided into 18,980 0.25 m2 cells with a manual classification applied to each within a geographic information system (GIS). Geospatial analysis shows that cell distribution is...
Tipo: Text
Palavras-chave: Cold-water coral; Habitat mapping; Spatial analysis; Sediments; Fades distribution.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00390/50129/50732.pdf

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

Influence of bacteria on the response of microalgae to contaminant mixtures
Provedor de dados: 5
Autores: Fouilland, Eric; Gales, Amandine; Beaugelin, Ines; Lanouguere, Elodie; Pringault, Olivier; Leboulanger, Christophe.
When microalgae are exposed to contaminants, the role of associated bacteria within the phycosphere, the microenvironment surrounding algal cells, remains largely unknown. The present study investigated the importance of algae-associated bacteria on the responses of microalgae growth to metallic and organic toxicant exposure. The effects of a polluted sediment elutriate, and of metal or pesticide mixtures at environmentally relevant concentrations (&lt;10 μg L−1) were assessed on the growth of two microalgae strains: Isochrysis galbana, a prymnesiophyte, and Thalassiosira delicatula, a centric diatom. Both cultures were maintained as axenic or bacterized under similar conditions in batch cultures. In axenic conditions, the metal mixture addition at low...
Tipo: Text
Palavras-chave: Microbial interactions; Metallic and pesticide contaminants; Sediments.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00453/56422/58325.pdf

Mesures geotechniques par grand fond
Provedor de dados: 5
Autores: Cochonat, Pierre; Dansy, G; Leduc, Bernard; Meunier, Jacques; Harmegnies, Francois; Floury, L.
The mechanical behaviour of sediments is usually studied from laboratory core analyses which do not take into account the real state of in-situ stresses. Therefore, the aimed purpose is presently to determine the in-situ geotechnical properties which mainly depend on the relationship between fine-grained particles and intergranular fluids. At IFREMER, these achievements have been pursued in the framework of 2 scientific program: "Nodules and Sedimentary Processes and Instability on Slopes, for which surficial measurements were conducted on selected seafloor targets usually pre-defined from high resolution geophysical data." 2 kinds of instrumentation were developed in correlation to 2 different strategies of handling at sea. There is the instrumentation of...
Tipo: Text
Palavras-chave: Submarine cables; Deep sea mining; Offshore equipment; Geotechnology; Submersibles; Sedimentary structures; Sedimentology; Ferromanganese nodules; Instability; Marine technology; Sediments; Ocean floor; Deep water.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/1990/acte-1157.pdf

Phosphorus forms related to sediment grain size and geochemical characteristics in French coastal areas
Provedor de dados: 5
Autores: Andrieux-loyer, Françoise; Aminot, Alain.
Phosphorus forms with respect to sediment characteristics, such as grain-size, and major chemical elements, were studied in French coastal marine areas (the Bay of Seine and the Loire and Gironde Estuaries).In the three areas, Fe/Al-bound phosphate (Fe/Al-P) and exchangeable phosphate (exch-P) were significantly related to the proportion of fine fraction (&lt; 63 mum). The special association of these forms with fine particles, as well as the relationships between exch-P, Fe/Al-P and Fe showed that adsorption processes on Fe oxides had taken place. However, for similar Fe concentrations, Bay of Seine sediments showed Fe/Al-P concentrations which were four to five times higher than those found in the Loire and Gironde Estuaries. This was attributed to...
Tipo: Text
Palavras-chave: Coastal areas; Major elements; Phosphorus forms; Grain size; Sediments.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-469.pdf

Instabilites sous-marine etudiees par submersibles
Provedor de dados: 5
Autores: Savoye, Bruno.
Sediment instability appears to be important as a part of global sedimentary budget. Among the various types of sedimentary instabilities, submarine slides are probably the most spectacular and the hardest to study and predict, although their consequences on human and industrial marine activities can be dramatic. IFREMER is conducting a research project on this topic. An area off Nice (France) has been particularly studied because of its recent activity. Mapping and instability area detection have been carried out. With the possibility of direct interactive observation and highly accurate submarine in -situ operation, the submersible is an extremely efficient tool for sediment studies, but diving purposes have to be precisely defined to provide useful...
Tipo: Text
Palavras-chave: Sediments; Instability; Sedimentology; Sedimentary structures; Ocean floor; Marine technology; Geology; Submersibles; Unmanned vehicles.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/1990/acte-1150.pdf

Evolution of bacterial communities precipitating carbonate, in Mediterranean lagoons water and sediment: Study on experimental conditions.
Provedor de dados: 5
Autores: Castanier, S; Maurin, A; Bianchi, A.
To determine if carbonate precipitation is an active or passive bacterial phenomena, factorial analysis has been realized with 880 strains isolated from different samples of sea water and muds kept in various conditions of incubation. Results show the existence of a strong anti-correlation between carbonate precipitation and amino-acid ammonification. Carbonate precipitation is not a passive phenomena linked with amino-acid ammonification.
Tipo: Text
Palavras-chave: MED; Biogeochemistry; Mathematical analysis; Water analysis; Sediments; Amino acids; Bacteria; Coastal lagoons; Chemical precipitation; Calcium carbonates.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-956.pdf

Dynamique des matières en suspensions minérales des eaux de surface de la Manche observée par satellite et modélisée numériquement.
Provedor de dados: 5
Autores: Rivier, Aurelie.
Study of mineral suspended particulate matter (SPM) is essential to understand ecosystem dynamics. SPM influences light penetration which is closely related to primary production and carries pollutants and nutrients within the water masses. This work aims to study near-surface mineral SPM dynamics in the English Channel using two complementary methods: remote-sensing by satellites and numerical modelling. Firstly, MODIS and MERIS satellite images processed by the IFREMER semi-analytical algorithm and describing non-algal SPM, are analysed to build three statistical models which are able to estimate near-surface SPM using simple variables, e.g., tidal coefficient, significant wave height and mean chlorophyll-a concentration. Secondly, the three-dimensional...
Tipo: Text
Palavras-chave: Matière en suspension; Télédétection; Satellite; Modélisation; Manche; Sédiments; Turbidité; Marée; Houle; Suspended particulate matter; Satellite; Remote-sensing; Modelling; English Channel; Sediments; Turbidity; Tide; Wave.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00157/26783/24884.pdf

Environmental and Benthic Community Patterns of the Shallow Hydrothermal Area of Secca Delle Fumose (Baia, Naples, Italy)
Provedor de dados: 5
Autores: Donnarumma, Luigia; Appolloni, Luca; Chianese, Elena; Bruno, Renato; Baldrighi, Elisa; Guglielmo, Rosanna; Russo, Giovanni F.; Zeppilli, Daniela; Sandulli, Roberto.
The occurrence of hydrothermal vent ecosystems at Secca delle Fumose, Pozzuoli Bay (Gulf of Naples), represented an opportunity to study the benthic assemblages under the thermal stress of hydrothermal emissions in a very shallow environment (9–14 m water depth). In autumn 2016, the macrobenthic community was sampled by scuba divers at four sites located in the Baia Underwater Archeological Park. Two sites were characterized by vent emissions (one with white bacterial mat scattered on the bottom and one with a yellow substrate around a geyser opening) and two at about 100 m away, used as control. Sediment and interstitial water environmental variables were measured to determine their influence on the structure of macrobenthic assemblages. A total of 1,954...
Tipo: Text
Palavras-chave: Shallow hydrothermal vents; Interstitial water; Sediments; Macrofauns; Benthos; Extreme habitats; Mediterranean Sea.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00590/70245/68283.pdf

Lithologie des délestages glaciaires (niveaux de Heinrich) de l'Eperon de Goban (Atlantique Nord-Est)
Provedor de dados: 5
Autores: Van Rooij, David.
Goban Spur is a marginal plateau, 250 km SW of Ireland, with the Celtic Margin on its eastern side and Porcupine Seabight Basin on its northern side. A set of NNE-SSW trending escarpments separate the upper part of Goban Spur from the Porcupine Abyssal Plain. We have studied a transect of Kullenberg cores taken during the 1984 Norestlante 2 campaign. Biostratigraphical and sedimentological (carbonate content) analyses were carried out by Müller [1986] and Foucault [1987]. All cores were accurately cleaned and described before digital photographs were taken in order to obtain grey level profiles and an estimate of the coarse grain size fraction (&gt; 150 µm). Magnetic susceptibility and gamma density measurements were obtained using a GEOTEK Multi Sensor...
Tipo: Text
Palavras-chave: Goban Spur; Quaternaire; Sédiments; Délestages glaciaires; IRD; Turbidites; Niveau de Heinrich; Calotte glaciaire.; Goban Spur; Quaternary; Sediments; IRD; Turbidites; Heinrich Layer; Heinrich Event; Ice Sheet.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00412/52317/53096.pdf

Critères de pollution par hydrocarbures dans les sédiments marins. Étude appliquée à la pollution du "Bohlen"
Provedor de dados: 5
Autores: Marchand, Michel; Roucache, J.
In October 16, 1976, the tanker "Bohlen" was wrecked in the Mer d'Iroise, at about 35 miles of Brest, and lossed about 7 000 t of Boscan crude oil. The coast of Brittany was polluted by 3 000 t, and 4000 t were dispersed in the marine environment. In July 1977, 23 surface sediment samples were collected to look for the traces of oil spill in the sea bottom, 9 months after the shipwreck. Only one sediment was very iittle polluted by the Boscan crude oil. Elsewhere, two other kinds of oil pollution were observed in sorne sediment samples. Severa! quantitative and qualitative criteria were used to research sorne oil pollution in the marine sediments and to know the origin: hydrocarbon concentrations, ratios total organic extra ct 1 organic carbon,...
Tipo: Text
Palavras-chave: Pollution; Hydrocarbures; Sédiments; « Bohlen »; Pollution; Hydrocarbons; Sediments; "Bohlen".
Ano: 1981
URL: http://archimer.ifremer.fr/doc/00121/23206/21051.pdf

Seasonal development of bacterial communities in a coastal marine sediment as related to the input of organic material.
Provedor de dados: 5
Autores: Meyerreil, L; Graf, G.
The seasonal development of benthic communities was followed in a coastal marine sediment of the Kiel Bight (Baltic Sea; FRG). Total benthic biomass, (ATP), bacterial biomass, overall benthic activity (heat production), and enzymatic decomposition rates of carbohydrate (d-amylase activity) followed a seasonal cycle strongly related to certain events in the sediment. Among these, the input of the phytoplankton blooms in autumn and spring, the accumulation of organic material during winter, and changes in the physical characteristics of the sediment turned out to be most important for the development of benthic biomass and activity. Processes within the benthic community occurred in very short time scales (within days).
Tipo: Text
Palavras-chave: Bacteria; Organic matter; Sediments; Bioenergetics; Enzymatic activity; Biomass.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-944.pdf

Ferrihydrite precipitation in groundwater-fed river systems (Nete and Demer river basins, Belgium): Insights from a combined Fe-Zn-Sr-Nd-Pb-isotope study
Provedor de dados: 5
Autores: Dekov, V.m.; Vanlierde, E.; Billstrom, K.; Garbe-schoenberg, C. -d.; Weiss, D. J.; Gatto Rotondo, G.; Van Meel, K.; Kuzmann, E.; Fortin, D.; Darchuk, L.; Van Grieken, R.
Two groundwater-fed river systems (Nete and Demer, Belgium) carry red suspended material that settles on the river bed forming red sediments. The local aquifer that feeds these river systems is a glauconite-rich sand, which provides most of the dissolved Fe to the rivers. The solid component of these systems, i.e., the red suspended material and sediments, has a simple mineralogy (predominantly ferrihydrite), but shows a complex geochemistry pointing out the different processes contributing to the river chemistry: (1) the red sediments have higher transition metal (excluding Cu) and detrital element (e.g., Si, Al, K, Rb, etc.) concentrations than the red suspended matter because of their longer residence time in the river and higher contribution of the...
Tipo: Text
Palavras-chave: Ferrihydrite; Fe-Zn-Sr-Nd-Pb-isotopes; Rivers; Sediments; Suspended matter.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00203/31404/29789.pdf

Microbial activity at the deep water sediment boundary layer in two highly productive systems in the Western Mediterranean: the Almeria-Oran front and the Malaga upwelling
Provedor de dados: 5
Autores: Bianchi, A; Calafat, A; De Wit, R; Garcin, J; Tholosan, O; Cacho, I; Canals, M; Fabres, J; Grout, H; Masque, P; Sanchez-cabeza, Ja; Sempere, R.
Microbiological and biogeochemical studies were carried out in sediments and near bottom waters in the upwelling area off the Malaga coast and in the Almeria-Oran frontal zone. In these nutrient-rich conditions, metabolic activity is potentially limited by oxygen availability through the sediment depth. In the surficial sediments of the frontal zone, however, oxygen penetrated to a depth of 4 cm, allowing oxic mineralisation processes to occur throughout the layer. In the surficial sediments of the upwelling area, oxygen penetration was limited to the top 2.5 cm, leading to anoxic conditions. Glutamate respiration and global oxygen uptake rates were clearly higher than in the frontal zone. In the superficial sediments of the frontal zone, bacteria were...
Tipo: Text
Palavras-chave: Taux de minéralisation; Sédiments; Eaux profondes; Méditerranée occidentale; Bacteria; Mineralisation rate; Sediments; Deep-sea; Western Mediterranean.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43298/43034.pdf

The ICES North Sea Benthos Project 2000: aims, outcomes and recommendations
Provedor de dados: 5
Autores: Rees, Hubert; Eggleton, Jacqueline D.; Vanden Berghe, Edward; Aldridge, John; Bergman, Magda J. N.; Boalm,; Cochrane, Sabine; Craeymeersch, Johan A.; Degraer, Steven; Desroy, Nicolas; Dewarumez, Jean-marie; Duineveld, Gca; Essink, Karel; Goethals,; Hillewaert, Hans; Irion,; Kershaw, Peter; Kroncke, Ingrid; Lavayele, Marc; Mason, Claire; Nehring, Stefan; Newell, Richard; Oug, Eivind; Pohlman, Thomas; Reiss, Henning; Robertson, Mike; Rumorh, Heye; Schratzberger, Michaela; Smith,; Van Dalfsen, Jan; Van Hoey, Gert; Vincx, Magda; Willems, Wouter.
The ICES Study Group on the North Sea Benthos Project 2000 undertook to integrate recent (1999–2002) macrobenthic infaunal and environmental data from various national sources. The main aim was to compare the outcome with that of the ICES North Sea Benthos Survey conducted in 1986, to identify any significant changes and their likely causes. In the process, the exercise yielded valuable lessons for the conduct of international collaborative programmes, as well as insights into the utility of a range of interpretational tools. These are timely in view of increasing requirements for periodic sea-wide assessments of quality status to meet international obligations, such as those under OSPAR, ICES, HELCOM, and EU auspices for European waters. This paper...
Tipo: Text
Palavras-chave: Macrobenthos; Infauna; Sediments; Communities; Ecosystems; North Sea.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00158/26893/25024.pdf

Dinoflagelados bentónicos nocivos en sedimento de Jaimanitas costa NW de Ciudad de la Habana, Cuba.
Provedor de dados: 20
Autores: Delgado, G.; Méndez, L.; Lechuga, C. H.
Durante un año fueron estudiados los dinoflagelados bentónicos nocivos agrupados sobre el sedimento de una ensenada donde desemboca el río Jaimanitas (región NW de Ciudad de la Habana). Se muestrearon seis puntos fijos sobre tres tipos de sedimentos: fango arenoso, areno-fangoso y arenoso. Prorocentrum fue el género dominante con cuatro especies y dentro de estas Prorocentrum lima, fue la más abundante en distribución espacial y temporal. La variación espacial de la densidad celular osciló entre 0.74 X 103 cél/cm3 y 2.36 X 103 cél/cm3 y la temporal fluctuó entre 0.12 x 103 cél/cm3 y 2.09 x 103 cél/cm3, registrándose el mínimo en enero y febrero, mientras que el máximo se obtuvo en agosto. Por el método del Escalado Multidimensional (MDS), se pudieron...
Tipo: Preprint
Palavras-chave: Sediments; Rivers; Rivers; Http://aims.fao.org/aos/agrovoc/c_6617.
Ano: 2010
URL: http://hdl.handle.net/1834/3839

Correlación estratigráfica en base a registros de pozos en el Golfo de Guayaquil
Provedor de dados: 20
Autores: Sarmiento, F.
El presente trabajo se basa en la interpretación de registros eléctricos y convencionales de pozos ubicados en el Golfo de Guayaquil dentro de una área aproximada de 868.911 hectáreas, entre las coordenadas 2° -4 latitud sur y 80° -81° longitud oeste. Los perfiles fueron corridos por ADA OIL EXPLORATION CO. entre 1969 y 1972, y mediante su interpretación se elaboraron las columnas estratigráficas respectivas y su correlación con el Graben de Jambelí, se logró determinar el tipo de sedimento predominante en la columna de cada pozo (Amistad 1,2,3,4; Tiburón 1; Esperanza 1). Además se ha realizado el cálculo de los parámetros petrofísicos a ciertos niveles de areniscas seleccionados, que pueden presentar algún interés como reservas de fluído (gas, aceite, o...
Tipo: Journal Contribution
Palavras-chave: Stratigraphic correlation; Sediments.
Ano: 1980
URL: http://hdl.handle.net/1834/2115

Caractérisation géochimique des sédiments de surface du golfe de Tunis
Provedor de dados: 20
Autores: Fernex, F.; Ben Mammou, A.; Added, A.; Abdeljaoued, S.; Essonni, N.
The general current of the Gulf of Tunis are dependent of the general Mediterranean current. This last divides to the level of the Gulf of Tunis in two branches; a first connects by pass west coasts of the gulf while the second branch crosses the centre of the gulf with a NNW - SSE direction. The passage of this second branch of the general current creates a central zone characterised by a sediment relatively sandier than what surrounds it and controls the distribution of the different metallic elements that have for main origin the Oued Mejerda. The metallic elements here analyzed are the Fe, Zn, Ni, Co, Cu and Pb. Their concentrations vary respectively between 0,5. and 1,6%; 279 and 447 ppm; 39 and 67 ppm; 20 and 34 ppm; 9 and 20 and between 56 and 142...
Tipo: Journal Contribution
Palavras-chave: Sediments; Biogeochemistry.
Ano: 2003
URL: http://hdl.handle.net/1834/1116

Influencia de las características hidrodinámicas y morfométricas en la distribución de 210 pb en los sedimentos superficiales de la bahía de Cienfuegos, Cuba.
Provedor de dados: 20
Autores: Muñoz Caravaca, A.; Herrera Marrero, R. H.; Fichez, R.; Douillet, P.; Díaz García, O.; Fernández, J. M.
Se presenta la distribución de 210Pb en los sedimentos  de la Bahía de Cienfüegos colectados durante la campaña  oceanográfica Jagua, desarrollada entre los meses Mayo a Junio del 2006. El 210Pb  alcanzó un valor medio de  71.3 mBqKg-1 en un rango de 30.8 - 205.5  mBqKg-1. Existe un área de acumulación de 210Pb en el lóbulo sur de  la Bahía de Cienfüegos que responde a las características morfológicas e hidrodinámicas de este sector de la  bahía, en particular al patrón de circulación de las aguas y la profundidad de la bahía.
Tipo: Journal Contribution
Palavras-chave: Estuaries; Sediments; Bays.
Ano: 2010
URL: http://hdl.handle.net/1834/4615

Caracterización química de los sedimentos superficiales de las bahías de Cárdenas y Santa Clara, Archipiélago Sabana-Camagüey, Cuba.
Provedor de dados: 20
Autores: Montalvo, J. F.
Los sedimentos superficiales de las bahías de Cárdenas y Santa Clara fueron muestreados en mayo de 2002 y julio de 2005, evaluándose los parámetros orgánicos e inorgánicos que tienen mayor peso en los ciclos biogeoquímicos (carbón, nitrógeno, fósforo, carbonatos, sulfuro de hidrógeno y consumo de oxidante químico). Los sedimentos de las bahías de Cárdenas y Santa Clara, poseen notables contenidos de carbón orgánico y concentraciones de nitrógeno inferiores a 0,2 %, evidenciando que la fuente principal de materia orgánica en estos cuerpos de agua es la vegetación periférica y acuática, rica en carbono y pobre en nitrógeno. En estas bahías las concentraciones promedio de carbonatos son superiores al 35 %, aunque la mayor riqueza corresponde a la bahía de...
Tipo: Journal Contribution
Palavras-chave: Sediments; Organic carbon; Nitrogen; Hydrogen sulphide; Bays; Nitrogen; Hydrogen sulphide; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_15986.
Ano: 2006
URL: http://hdl.handle.net/1834/3342

Estudio de los sedimentos del sector donde convergen los ríos Daule y Babahoyo, y las posibles causas que están formando un  nuevo islote en ese sector
Provedor de dados: 20
Autores: Soledispa, B.
Los objetivos de este artículo son: - Caracterizar el área de estudio en base a los tipos de sedimentos que predominan en el sector, a su distribución aproximada en el mismo, así como a su posible proveniencia. - Determinar la carga de sedimentos en suspensión que transportan los ríos.  - Determinar las posibles causas que están originando la formación de una nueva isla en la desembocadura del Río Daule.
Tipo: Journal Contribution
Palavras-chave: Sediments; Granulometry; Sediment transport; Silt; Rivers; Sand; Sediment analysis; Rivers; Sand; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_6779.
Ano: 2002
URL: http://hdl.handle.net/1834/2268

Remote Sensing for Studying Nearshore Bottom Morphology and Shoreline Changes
Provedor de dados: 20
Autores: Shaghude, Y.W.
The major objective of the present study is to demonstrate how remote sensing approach can be used for studying nearshore bottom morphology and shoreline changes in coastal Tanzania. Two study sites were used. In the first site, remote sensing satellite Landsat Thematic Mapper data was evaluated against known water depths from conventional echo sounding measurement taken on the eastern side of the channel. The correlation between the remote sensing data and the echo sounding mesurement was rather satisfactory, suggesting that the approach can roughly be used to investigate sea bottom morphology in the nearshore areas. In the second study site, remote sensing satellite data from Landsat Thematic Mapper and Enhanced Thematic Mapper were used to investigate...
Tipo: Journal Contribution
Palavras-chave: Remote sensing; Sediments; Coastal erosion; Shorelines.
Ano: 2004
URL: http://hdl.handle.net/1834/195

Foraminíferos del rift de Galápagos
Provedor de dados: 20
Autores: Gualancañay, E.
Para este trabajo se analizaron un total de 17 muestras de sedimento para el estudio de los foraminíferos, se identificaron 10 especies de foraminíferos planctónicos y 8 especies de f. bentónicos. Las muestras fueron colectadas durante la expedición científica "GEOMETEP III", simultáneamente por el R/V "SONNE", de la República Federal Alemana y por el BAE "ORION", del Instituto Oceanográfico de la Armada del Ecuador, entre el 19 de Enero y el 16 de Febrero de 1983, en el rift de Galápagos, para un estudio de prospección en el área del 85/ 86°W, para iniciar un reconocimiento en la transecta de los 85° 30'W.
Tipo: Journal Contribution
Palavras-chave: Foraminifera; Sediments.
Ano: 1986
URL: http://hdl.handle.net/1834/2107

Determinación del contenido de metales pesados en las fracciones geoquímicas del sedimento superficial asociado a los manglares de la Ciénaga Grande de Santa Marta, Colombia
Provedor de dados: 20
Autores: Espinosa, Luisa Fernanda; Parra, Juan Pablo; Villamil, Carlos.
El ecosistema de manglar de la Ciénaga Grande de Santa Marta (CGSM) ha estado sometido a fuertes presiones antropogénicas que han ocasionado, entre otros, cambios en las características fisicoquímicas de sus sedimentos. En condiciones normales, los sedimentos asociados al manglar generan equilibrios que permiten la retención de metales pesados en distintas formas químicas, al romperse este equilibrio los metales que no son retenidos en la matriz sedimentaria, pueden ser removilizados y hacerse biodisponibles. Con el propósito de establecer el potencial de movilidad y biodisponibilidad  de los metales Cr, Mn, Ni, Cu, Zn, Cd, As y Pb en sedimentos superficiales asociados al manglar en la CGSM, se analizaron sus contenidos en cuatro áreas con diferente grado...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Sediments; Bioavailability.
Ano: 2011
URL: http://hdl.handle.net/1834/4379

Evaluación de las zonas con impacto antrópico del Golfo de Batabanó, Cuba. Empleo de índices de calidad.
Provedor de dados: 20
Autores: Martínez Canals, M.; Montalvo, J. F.; Lugioyo, G.M.; Loza, S.; Pérez, R.
Se realizó la evaluación de los posibles cambios ambientales debido a los impactos antrópicos que han ocurrido en los últimos años en este escenario y la redefinición de áreas que sufren afectaciones, teniendo en cuenta que cualquier alteración ambiental de este ecosistema, ya sea de origen natural o humano, puede tener una importante repercusión económica y social. A partir de los índices químicos y biológicos propuestos, las aguas del Golfo de Batabanó presentaron condiciones mesotróficas con tendencia a la eutrofización en cuatro áreas fundamentales. En los sedimentos del Golfo los valores de carbono orgánico (0.16-7.30 %) y sulfhídrico (12,19-22,90 μg/L) fueron característicos de fondos con altas concentraciones de materia orgánica. En el sector...
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Sediments; Heavy metals; Phytoplankton; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2006
URL: http://hdl.handle.net/1834/3340

Determinación de la concentración de hidrocarburos en las aguas superficiales y sedimentos y su relación con Capitella capitata para conocer la contaminación del estuario del Río Chone
Provedor de dados: 20
Autores: Paredes, P.
Durante mayo a octubre del 2007 abarcando la época seca y lluviosa, se realizaron análisis para la determinación de hidrocarburos aromáticos totales existentes en agua y sedimentos dentro del estuario del Río Chone mediante la técnica de CARIPOL; los análisis fueron realizados en el Instituto Oceanográfico de la Armada. Dentro del estuario se tomaron 4 estaciones cada una de ellas con un punto de referencia: Estación 1:Isla Corazón, Estación 2: Mangle 2000, Estación 3: Capitanía de Puerto, Estación 4: Repsol. Las muestras fueron tomadas una vez al mes; tomando en cuenta la radiación solar y mareas como variables para el estudio. La concentración de hidrocarburos aromáticos totales disueltos y dispersos en el agua fue entre 0.05-0.329 ug/L, el valor más...
Tipo: Journal Contribution
Palavras-chave: Aromatic hydrocarbons; Sediments; Chemical analysis; Indicator species; Pollution legislation.
Ano: 2010
URL: http://hdl.handle.net/1834/4217

Caracterización de la calidad de las aguas y sedimentos del Río Atacames 2002
Provedor de dados: 20
Autores: Rodríguez de Morán, A.
La presente investigación se desarrolló como parte  de Estudio de calidad de las aguas de los ríos de la Provincia de Esmeraldas durante mayo del 2002, como aporte del INOCAR a la Ilustre Municipalidad del Cantón Atacames, Institución que se encuentra realizando esfuerzos en los planes de operación para cumplir con la concepción del estado ecuatoriano sobre protección ambiental. Se presenta y evalúa los resultados obtenidos tanto en el estudio de calidad de las aguas como de los sedimentos del río Atacames en la Provincia de Esmeraldas, tomando en consideración la distribución y comportamiento superficial de parámetros físico, químicos y microbiológicos en un área que abarca entre 15 kilómetros aguas arriba y su desembocadura en el Océano Pacífico. Durante...
Tipo: Journal Contribution
Palavras-chave: Water quality; River water; Sediments; Oxygen; Petroleum hydrocarbons; Microbial contamination; Pollution effects; Organic wastes; Sewage; Water quality; Microbial contamination; Organic wastes; Oxygen; Sewage; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_37547; Http://aims.fao.org/aos/agrovoc/c_35237; Http://aims.fao.org/aos/agrovoc/c_5477; Http://aims.fao.org/aos/agrovoc/c_7007.
Ano: 2003
URL: http://hdl.handle.net/1834/2373

Estudio geoquímico de los sedimentos en el Canal de Jambelí
Provedor de dados: 20
Autores: Jácome de Solórzano, M.; Llanos de Bonilla, L.
Se presenta las características geoquímicas del Canal de Jambelí en base al análisis de 41 muestras de sedimentos del fondo marino, obtenidas durante marzo y junio de 1986 (Fig.1). Se identifica la presencia de dos dominios de sedimentación, el uno de tipo fluvial y el otro marino; así mismo una posible tendencia de avance del sedimento fluvial sobre el sedimento marítimo. Se establece además que la concentración de los constituyentes orgánicos se encuentran dentro de rangos normales y guarda relación con la textura del sedimento.
Tipo: Journal Contribution
Palavras-chave: Geochemistry; Sediments; Geochemistry; Http://aims.fao.org/aos/agrovoc/c_24848.
Ano: 1987
URL: http://hdl.handle.net/1834/2131

Distribución de quistes de Alexandrium catenella y otros dinoflagelados en sedimentos de la zona sur-austral de Chile
Provedor de dados: 20
Autores: Lembeye, Georgina.
During the expeditions Cimar - Fiordos 2, 3 and 4 (1996, 1997 and 1999), samples of marine sediments were collected in Southern Chile, between Melinka (Lat. 43° 45' S) and Beagle Channel (Lat. 54° 56' S) to study the distribution and abundance of dinoflagellate cysts, particularly the toxic dinoflagellate Alexandriurn catenella. Samples were collected from 33 stations at depths of 1 to 15 meters. The study included photographic record and taxonomic identification of cysts to genus and, whenever possible, to species, with emphasis on the identification of cysts of A. catenella. Cysts from samples collected in cruises 3 and 4, were incubated in f/2-Se culture medium at 13 °C with controlled photoperiod (14:10, L:D), to induce germination and confirm species...
Tipo: Journal Contribution
Palavras-chave: Sediments; Quantitative distribution; Cysts; Zooplankton; Cysts; Zooplankton; Http://aims.fao.org/aos/agrovoc/c_34811; Http://aims.fao.org/aos/agrovoc/c_15490.
Ano: 2004
URL: http://hdl.handle.net/1834/4126

Sedimentation, transport und erosion an der  Nordküste Kolumbiens zwischen Barranquilla und der Sierra Nevada de Santa Marta
Provedor de dados: 20
Autores: Erffa, A. Frhr. von.
El Río Magdalena desemboca actualmente en el mar Caribe, por el extremo occidental de este territorio y ha formado varios deltas, estos se han originado en tres fases comprendidas en el cuaternario reciente. Los dos más antiguos quedaron destruidos por la erosión y solamente son detectados en la morfología submarina. El delta siguiente en antigüedad, alcanzó su mayor amplitud hace 2.400 años aproximadamente La etapa de destrucción de este delta se inició por aquellos tiempos, y aún continua en actividad. El delta más reciente se está formando al frente de la boca actual del Río Magdalena. Se describen los rasgos topográficos, sedimentológicos y la distribución de la fauna bentónica, en los sectores NE y E de la plataforma submarina de San Andrés. La...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Estuaries; Geology; Sediments; Erosion; Coastal erosion; Sediment transport; Estuaries; Geology; Erosion; Coastal lagoons; Coastal erosion; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_3232; Http://aims.fao.org/aos/agrovoc/c_2651; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_9949.
Ano: 1973
URL: http://hdl.handle.net/1834/3254

Impact d’un lubrifiant minéral sur la structure trophique des peuplements de nématodes libres marins de la lagune de Ghar el Melh: Etude microcosmique
Provedor de dados: 20
Autores: Louati, H.; Soltani, A.; Beyrem, H.; Aissa, P.; Mahmoudi, E.
Une étude microcosmique a été effectuée pour examiner l’influence d’un lubrifiant minéral avant et après son utilisation dans un moteur de véhicule  sur la structure trophique de la communauté de nématodes libres originaire de la lagune de Ghar El Melh. Une concentration de 1mg kg-1 de sédiment a été testée pour évaluer l’effet du polluant après 40 jours d’exposition. Les résultats de l’étude ont révélé que les consommateurs non sélectifs (1B), les plus abondants dans le microcosme témoin, ont été très affectés et leur dominance a diminué significativement sous l’effet de la contamination par le lubrifiant minéral avant ou après usage. Les détritivores sélectifs (1A) dont la dominance augmente significativement au iveau des microcosmes traités avec le...
Tipo: Journal Contribution
Palavras-chave: Microcosms; Oil pollution; Petroleum; Pollution effects; Sediments; Trophic structure; Petroleum; Http://aims.fao.org/aos/agrovoc/c_5747.
Ano: 2008
URL: http://hdl.handle.net/1834/3754

Aplicación estadística en los bioensayos de toxicidad con sedimentos extraído del Estero Salado, canal de acceso al Puerto Marítimo de Guayaquil
Provedor de dados: 20
Autores: Villamar, F.
With the purpose of proving and determining in a short term the impact of the dredged material that can be caused by the organisms that inhabit the marine-estuary ecosystem, was performed toxicity bioassay of the sediment extracted from the bottom of the Salado Estuary. This sediment obstructs the access channels of the Marítime Port of Guayaquil. For this bioassay, was used white shrimp larvae of the species Litopenaeus vannamei, a commercially important organism that depends for its food on the organic detritus coming from the sediment and the column of estuary water in the studied area. The results obtained were analyzed applying the graphic arithmetic method and statistical analysis, through which it was determined that there is a direct relation...
Tipo: Journal Contribution
Palavras-chave: Bioassays; Toxicity; Marine organisms; Sediments; Statistical analysis; Kurtosis; Dredged samples; Bioassays; Toxicity; Statistical analysis; Http://aims.fao.org/aos/agrovoc/c_15731; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_7378.
Ano: 2002
URL: http://hdl.handle.net/1834/2257

Shore Morphology and Sediment Characteristics  South of Pangani River, Coastal Tanzania
Provedor de dados: 20
Autores: Shaghude, Y.W.
The shore morphology and nearshore sediments between the Pangani and Kipumbwi rivers were investigated to describe the shore and the reef platform sediments characteristics and also to update information on recent shoreline changes along the Tanzania mainland coast. The information gathered during this study comes from field observations, sediment sampling of the area and interviews with Pangani residents. The investigated area is a patch reef coast with narrow or no beaches and fossil reef terrace islands offshore, Pangani bay and estuary are among the most prominent shore features. Historical information indicates that, both the bay, and the estuary have undergone significant changes during the last 60 years. While the growth of the estuary has mainly...
Tipo: Preprint
Palavras-chave: Sedimentation; Coastal sediment; Sediments; Reefs; Shorelines; Sediment sampling.
Ano: 2004
URL: http://hdl.handle.net/1834/214

Estudio de la materia orgánica en los sedimentos del Río Jubones, en el área comprendida entre el puente la Iberia hasta su desembocadura
Provedor de dados: 20
Autores: Jácome de Solórzano, M.; Llanos de Bonilla, L.
El principal objetivo de este trabajo es determinar cuantitativamente el contenido de la materia orgánica en base a la concentración de carbono orgánico, nitrógeno orgánico y fósforo total, tratando de sugerir el posible origen del material orgánico sedimentario en el Río Jubones.
Tipo: Journal Contribution
Palavras-chave: Organic matter; Sediments; Organic matter; Http://aims.fao.org/aos/agrovoc/c_5387.
Ano: 1990
URL: http://hdl.handle.net/1834/2170

Morfología y sedimentación del sistema estuarino  Estero Salado - Río Guayas
Provedor de dados: 20
Autores: Rada, F.
Durante el período 1984-1985 se realizaron estudios geológicos en el sistema estuarino Estero Salado - Río Guayas, los mismos que comprendieron trabajos de geomorfología, geofísica (sísmica) y sedimentología. Los resultados de esas investigaciones, que se presentan en este artículo, llevan a establecer las diferencias existentes entre el Estero Salado y Río Guayas como consecuencia probable del mayor aporte de sedimentos y corrientes de agua recibida por el Río Guayas, y de la carga adicional de sedimentos por la construcción de camaroneras y tala de manglares.
Tipo: Journal Contribution
Palavras-chave: Geomorphology; Sediments; Estuarine sedimentation; Estuaries; Estuaries; Geomorphology; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_3233.
Ano: 1986
URL: http://hdl.handle.net/1834/2143

Características geomorfológicas y sedimentológicas de la Bahía de Santa Elena
Provedor de dados: 20
Autores: Soledispa, B.
En este trabajo se presentan los resultados de las investigaciones realizadas sobre sedimentos superficiales de fondo, desde el punto de vista granulométrico. Un total de 28 muestras de sedimentos del área entre la Puntilla de Santa Elena y Punta Blanca (Provincia de Santa Elena, Ecuador), fueron analizadas, de cuyo resultado se determinó una predominancia de arena media a fina, mal seleccionada, aunque también hay bien seleccionadas; son asimétricamente negativas. Los acantilados del sector están conformados por rocas sedimentarias, muy inestables, por eso son de fácil erosión. Centros turísticos y poblacionales se han instalado a lo largo de la línea de costa.
Tipo: Journal Contribution
Palavras-chave: Sediments; Geomorphology; Granulometry; Geomorphology; Http://aims.fao.org/aos/agrovoc/c_3233.
Ano: 2009
URL: http://hdl.handle.net/1834/3370

Características de la sedimentación marina litoral comprendida entre la Puntilla de Santa Elena y Punta Ancón, Provincia de Santa Elena, Ecuador
Provedor de dados: 20
Autores: Soledispa, B.
El principal objetivo es el de determinar los tipos de sedimentos que predominan en el área de estudio, así como su distributión aproximada en el mismo.
Tipo: Journal Contribution
Palavras-chave: Sediments; Sediment distribution.
Ano: 2007
URL: http://hdl.handle.net/1834/2368

Estudio de las características sedimentológicas del estero Santa Rosa en la Provincia de El Oro, Ecuador
Provedor de dados: 20
Autores: Soledispa, B.
En este artículo se determina los tipos de sedimentos predominantes en el área de estudio, su distribución aproximada en el mismo, así como su posible proveniencia. Determinar la carga de sedimentos en suspensión del estero en una determinada época del año.
Tipo: Journal Contribution
Palavras-chave: Sediments; Sediment distribution; Sediment composition; Sediment transport; Marshes; Marshes; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 2006
URL: http://hdl.handle.net/1834/2374

Evaluación geoquímica en la fase sedimentaria de ecosistemas costeros del Estado de Sonora, México
Provedor de dados: 20
Autores: Villalba, A.I.; Ortega Romero, P.; De la O Villanueva, M.
Se elaboró este trabajo en los cuerpos lagunares Guásimas, Algodones y Lobos y contribuir, de esta forma, al conocimiento geológico marino de los sistemas costeros del litoral de Sonora.
Tipo: Journal Contribution
Palavras-chave: Evaluation; Geochemistry; Sediments; Coastal lagoons; Evaluation; Geochemistry; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2736; Http://aims.fao.org/aos/agrovoc/c_24848; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1989
URL: http://hdl.handle.net/1834/2159

Estudio de las características sedimentológicas, de la desembocadura del Río Chone, frente a la ciudad de Bahía de Caráquez, Ecuador
Provedor de dados: 20
Autores: Santana, E.; Soledispa, B.
El principal objetivo de este estudio, fue la determinación de los tipos de sedimentos, predominantes en el área de estudios; su distribución aproximada en el mismo; así como su posible proveniencia. También se determinó en que ciclo de marea, se presenta la mayor carga de sedimentos en suspensión.
Tipo: Journal Contribution
Palavras-chave: Sediments; Sediments; Rivers; Sediment composition; Rivers.
Ano: 1998
URL: http://hdl.handle.net/1834/2307

The anthropogenic effluents of the human activities on the red sea coast at hurghada harbour (case study)
Provedor de dados: 20
Autores: Madkour, H.A.; Dar, M.A.
The heavy metal accumulations in the seawater, coral reefs and two effective fractions of underlying sediments (&lt;0.125mm and &lt; 0.063mm) were studied in the coastal and tidal flat zones at the main shipyard near of Hurghada Harbour. The area of investigation is very worse whereas, it is considered tailing outlet for both solid and liquid influents of many human activities in/and surrounding the harbour. The solid phases are of construction remains, paint remains, iron pipe rusts, hydrocarbons, plastic bags, metal and wood remains as well as the artificially conglomerate stones that thrown in the in the marine area. The liquid phase is restricted in the continuous brine water draining to the sea from a huge desalination plant (Capacity 5000 cubic...
Tipo: Journal Contribution
Palavras-chave: Environmental Study; Sediments; Sea water; Coral reefs; Heavy metals; Coral reefs; Heavy metals; Sea water; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 2007
URL: http://hdl.handle.net/1834/1890

Environmental Impact; In Osman Digna (SUAKIN)
Provedor de dados: 20
Autores: El hag, A ' Gadir.
Tipo: Report
Palavras-chave: Salinity; Air-water temperature difference; Winkler method; Sediments; Coral reefs.
Ano: 2007
URL: http://hdl.handle.net/1834/5093

Los Bioensayos de Toxicidad en Sedimentos Marinos
Provedor de dados: 20
Autores: Carballo Hondal, O.; Arencibia Carballo, G.; Concepción, J.; Isla Molleda, M.
Many organic and in organic contaminants originated from human activities are deposited and concentrated in aquatic sediments. The purpose of this review article is to analyze and discuss, the objectives, procedures and applications of bioassays on the triad of marine sediments, aiming at a reflection on the possibility of implementing regulations on the environmental monitoring of these studies in our country, so as to improve the environmental quality and its management on coastal zones. The main objective is to highlight the understanding of the adequate application and interpretation of bioassays. A summary of reports is presented, knowledge and analysis concerning marine sediments including, the chemical analysis, the direct determination of...
Tipo: Journal Contribution
Palavras-chave: Toxicity; Sediments; Bioassays; Toxicity; Bioassays; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_15731.
Ano: 2010
URL: http://hdl.handle.net/1834/3670

Aspectos químicos del sistema bentónico del golfo San Jorge, Argentina (2005-2010)
Provedor de dados: 20
Autores: Fernández, M.B.; Cucchi Colleoni, A.D.
Chemical aspects of the San Jorge Gulf benthic system, Argentina (2005-2010). A new contribution on the chemical aspects of the San Jorge Gulf benthic system in the distribution area of shrimp Pleoticus muelleri (Spence Bate, 1888) during 2005-2010 is presented. Concentration of dissolved oxygen in bottom water and mix layer and of total organic matter (TOM), total organic carbon (TOC), total nitrogen (TN), chlorophyll a (Chl a) and phaeopigments (Phaeo) in surficial sediments were analyzed. The origin and nutritional value of TOM deposited were also assessed through the C:N ratio. Water samples were collected during the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) seasonal research cruises in the period 2005-2010. Sediment samples...
Tipo: Journal Contribution
Palavras-chave: Chemical composition; Sediments; Dissolved oxygen; Sea water.
Ano: 2013
URL: http://hdl.handle.net/1834/5506

Dynamique sédimentaire et répartition granulométrique des sédiments de surface dans la frange littorale Ras Taguermess-Ras Marmour (golfe de Gabès)
Provedor de dados: 20
Autores: Brahim., M.; Abdelfattah., A.
Les analyses granulométriques des sédiments superficiels de la zone côtière située entre Ras Taguermess et Ras Marmours montrent que les petits fonds (-2 à -10 m) sont couverts par des sables fins aux sables grossiers (la moyenne est entre 0,39  et 3,34 ), généralement mal à très mal classés. Cependant, le haut de plage situé entre Ras Taguermess et Ras Marmour est couvert essentiellement par des sables fins et des sables moyens (la moyenne est entre 1,082 et 2,823 ). La répartition spatiale des sables ne montre pas un grano-classement décroissant ou croissant des sédiments de la côte vers le large. Cette distribution est due à l‘existence d’une énergie importante où la houle joue le rôle essentiel sur leur répartition. L’étude granulométrique montre aussi...
Tipo: Journal Contribution
Palavras-chave: Beaches; Coastal zone; Grading; Grain size; Longshore sediment transport; Sand; Sediment analysis; Sediment texture; Sediments; Swell.
Ano: 2009
URL: http://hdl.handle.net/1834/4456

Cross-shelf biogeochemical characteristics of sediments in the central Benguela and their relationship to overlying water column hypoxia
Provedor de dados: 20
Autores: Monteiro, P.M.S.; Van Der Plas, Anja; Pascall, A.
Data from two cross-shelf sediment sampling cruises were used to explain reasons for the sediment biogeochemical variability in respect of carbon, nitrogen and sulphur, and how the cycling of these elements governs the biogeochemistry of the overlying water through their control of the redox conditions. The spatial extent of this benthic–pelagic flux link is limited to the innershelf mud belt system on the Namibian shelf. The inshore mud belt is the primary deposition area of the carbon and nitrogen new production export flux. The offshore organic-rich zones are thought to be relict particulate organic matter originating from the inshore mud belt rather than from an overlying pelagic source. These data were used to set up a multi-layer sediment model that...
Tipo: Journal Contribution
Palavras-chave: Anoxia; Carbon; Hypoxia; Modelling; Sediments; Carbon; Anoxia; Hypoxia; Http://aims.fao.org/aos/agrovoc/c_1301; Http://aims.fao.org/aos/agrovoc/c_8831; Http://aims.fao.org/aos/agrovoc/c_24472.
Ano: 2007
URL: http://hdl.handle.net/1834/2129

A non-parametric indicator Kriging method for generating coastal sediment type map.
Provedor de dados: 20
Autores: Liu, Fucheng; Peng, Jun; Zhang, Cunyong.
Coastal sediment type map has been widely used in marine economic and engineering activities, but the traditional mapping methods had some limitations due to their intrinsic assumption or subjectivity. In this paper, a non-parametric indicator Kriging method has been proposed for generating coastal sediment map. The method can effectively avoid mapping subjectivity, has no special requirements for the sample data to meet second-order stationary or normal distribution, and can also provide useful information on the quantitative evaluation of mapping uncertainty. The application of the method in the southern sea area of Lianyungang showed that much more convincing mapping results could be obtained compared with the traditional methods such as IDW, Kriging...
Tipo: Journal Contribution
Palavras-chave: Sediments; Mapping.
Ano: 2012
URL: http://hdl.handle.net/1834/5835

Dynamique sédimentaire et répartition granulometrique des sédiments de surface dans la frange littorale Ras Taguermess-Ras Marmour (golfe de Gabès)
Provedor de dados: 20
Autores: Brahim., M.; Atoui, A.
Les analyses granulométriques des sédiments superficiels de la zone côtière située entre Ras Taguermess et Ras Marmours montrent que les petits fonds (-2 à -10 m) sont couverts par des sables fins aux sables grossiers (la moyenne est entre 0,39  et 3,34 ), généralement mal à très mal classés. Cependant, le haut de plage situé entre Ras Taguermess et Ras Marmour est couvert essentiellement par des sables fins et des sables moyens (la moyenne est entre 1,082 et 2,823 ). La répartition spatiale des sables ne montre pas un grano-classement décroissant ou croissant des sédiments de la côte vers le large. Cette distribution est due à l‘existence d’une énergie importante où la houle joue le rôle essentiel sur leur répartition. L’étude granulométrique montre aussi...
Tipo: Journal Contribution
Palavras-chave: Beaches; Coastal zone; Grading; Longshore sediment transport; Sediment analysis; Sediment texture; Sediments; Swell.
Ano: 2009
URL: http://hdl.handle.net/1834/4445

Concentrations, Accumulation and Sources of PAHs in Surface Layer Sediments of Taizhou Bay.
Provedor de dados: 20
Autores: Jin, Binming.
The concentrations, accumulation and sources of 15 polycyclic aromatic hydrocarbons (PAHs) had been studied or evaluated in the surface layer sediments of Taizhou Bay, China. It showed that the concentrations of PAHs ranged from 85.4 to 167.6 ng/g (averaged 138.62 ng/g), and the highest level was found in Jiao Jiang Dock. Percentages of 2-, 3-, 4-, 5- and 6-cyclic aromatic hydrocarbons were 7.8 %, 42.1 %, 33.3 %, 9.6 % and 7.2 % respectively. The accumulation indices of PAHs ranged from 532.7 to 1068.9 (averaged 807.5), and the index of Phenanthrene was the highest (122.7), while that of Benzo (a) Pyrene was the lowest (2.7) among them. In Taizhou Bay, PAHs in surface layer sediments came mainly from coal burning, partly from direct pollution of petroleum...
Tipo: Journal Contribution
Palavras-chave: Sediments; Particle concentration.
Ano: 2008
URL: http://hdl.handle.net/1834/5869

Distribución de metales pesados (Pb, Cd y Zn) en perfiles de sedimento asociado a Rhizophora mangle en el Río Sevilla - Ciénaga Grande de Santa Marta, Colombia.
Provedor de dados: 20
Autores: Parra, J.P.; Espinosa, L.F.
Con el propósito de evaluar la distribución vertical de metales pesados Pb, Cd y Zn en el sedimento asociado a las plantas de Rhizophora mangle, se determinaron las concentraciones potencialmente biodisponibles y no biodisponibles, en tres perfiles de sedimento colectados en el río Sevilla, Ciénaga Grande de Santa Marta. Las mediciones se hicieron con la técnica de espectrometría de emisión atómica de plasma inductivamente acoplado. Los resultados mostraron que en el ecosistema de manglar del río Sevilla estos metales se acumulan principalmente en formas no biodisponibles, lo cual indica que la mayor parte de estos elementos se encuentran retenidos en el sedimento. La retención del Pb, Cd y Zn en el sedimento de éste ecosistema de manglar está fuertemente...
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Sediments; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2008
URL: http://hdl.handle.net/1834/3511

Estudio del bentos marino antártico en Bahía Chile o Discovery, Isla Greenwich (Islas Shetland del Sur), Antartida
Provedor de dados: 20
Autores: Cruz, M.
Del estudio de 14 muestras de sedimento se identificaron cuatro especies de moluscos bivalvos, dos gasterópodos y, como fauna acompañante, 12 grupos de organismos bentónicos, representados en ocho filos. Se hace una breve descripción de los moluscos encontrados, resaltando las características principales de cada especie, que se correlacionan con la profundidad y granulometría del sedimento. Se presenta tablas, mapas de distribución areas correspondientes a los grupos y especies de moluscos hallados; así como los dibujos de las especies de la malacofauna Antártica capturada en el verano austral de 1991.
Tipo: Journal Contribution
Palavras-chave: Benthos; Sediments; Marine molluscs; Taxonomy; Granulometry; Benthos; Taxonomy; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_7631.
Ano: 1990
URL: http://hdl.handle.net/1834/3873

Impact d'un lubrifiant minéral sur la structure trophique des peupelements de nématodes libres marins de la lagune de Ghar  El Melh  : Etude microcosmique
Provedor de dados: 20
Autores: Aissa, P.; Soltani, A.; Mahmoudi, E.; Louati, H.; Beyrem, H.
Une étude microcosmique a été effectuée pour examiner l’influence d’un lubrifiant minéral avant et après son utilisation dans un moteur de véhicule  sur la structure trophique de la communauté de nématodes libres originaire de la lagune de Ghar El Melh. Une concentration de 1mg kg-1 de sédiment a été testée pour évaluer l’effet du polluant après 40 jours d’exposition. Les résultats de l’étude ont révélé que les consommateurs non sélectifs (1B), les plus abondants dans le microcosme témoin, ont été très affectés et leur dominance a diminué significativement sous l’effet de la contamination par le lubrifiant minéral avant ou après usage. Les détritivores sélectifs (1A) dont la dominance augmente significativement au iveau des microcosmes traités avec le...
Tipo: Journal Contribution
Palavras-chave: Microcosms; Oil pollution; Petroleum; Pollution effects; Sediments; Trophic structure.
Ano: 2008
URL: http://hdl.handle.net/1834/4255

Estudio del meiobentos en el Golfo de Guayaquil, (Río Guayas, Canal Cascajal y Estero Salado), Ecuador, en agosto de 1996
Provedor de dados: 20
Autores: Cruz, M.
Con este aporte al conocimiento de la meiofauna del Golfo de Guayaquil, se pretende comenzar a difundir los diferentes grupos de organismos que antes de este trabajo no se conocían que existían en nuestro país, esperando que se incentiven nuevos trabajos de investigación en el campo de la meiofauna, para llegar a saber realmente las especies que tenemos en el ecosistema más "rico y/o productivo" del Ecuador y del Pacífico Sud-este.
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Sediments; Rivers; Marshes; Estuaries; Rivers; Estuaries; Meiobenthos; Marshes; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_12481; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 1998
URL: http://hdl.handle.net/1834/2306

Distribución de metales en sedimentos costeros del golfo de Guacanayabo
Provedor de dados: 20
Autores: Arencibia Carballo, G.; Isaac, M.; González, H.
Of great importance to our country economy in the coastal zone running along the Gulf of Guacanayabo because of the different species nurseries having commercial interest. Studies on Al, Pb, Zn, and Cu contents within the surface sediments along 210 km of coastal areas, where 42 stations were located are carried out in the work. Results obtained are used for distribution analysis of elements within the zone and their relationships with the domestic and industrial population groups.
Tipo: Journal Contribution
Palavras-chave: Heavy metals; Sediments; Coastal zone; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 1988
URL: http://hdl.handle.net/1834/1883

Estudio de las características sedimentológicas del área comprendida entre Ancon y el Canal del Morro (Golfo de Guayaquil)
Provedor de dados: 20
Autores: Soledispa, B.
Se estudian 146 muestras de sedimentos superficiales de fondo del Golfo de Guayaquil. Se presenta las características de los sedimentos en base al análisis granulométrico, parámetros estadísticos y distribución de los sedimentos; y se comparan estas distribuciones con otras de trabajos anteriores. Se establece que los sedimentos arenosos y sus diferentes combinaciones predominan en el área, ocupando casi un 80% de la misma. Los sedimentos limosos se ubican en el Noroeste, mientras que en el Oeste sólo encontramos una pequeña cantidad de fragmentos de conchas. El análisis comparartivo con investigaciones realizadas en 1975, no presenta variaciones significativas en la textura y distribución de los sedimentos.
Tipo: Journal Contribution
Palavras-chave: Sediments; Nearshore sedimentation; Sediment analysis; Sediment composition; Sediment distribution.
Ano: 1987
URL: http://hdl.handle.net/1834/2145

Clasificación de los sedimentos de la plataforma continental ecuatoriana - Provincia del Guayas en relación al porcentaje de carbonato de calcio
Provedor de dados: 20
Autores: Jácome de Solórzano, M.; Llanos de Bonilla, L.
Los objetivos de este estudio se resumen así: 1. Determinación de la cubierta sedimentaria de la plataforma, su textura y la repartición de las diferentes clases de sedimentos. 2. Establecimiento de los tipos de sedimentación existentes en la plataforma en base a la distribución horizontal de los valores de carbonato de calcio obtenidos. 3. Determinación de la relación entre las características granulométricas y químicas de los sedimentos.
Tipo: Journal Contribution
Palavras-chave: Classification; Sediments; Calcium carbonates; Classification; Http://aims.fao.org/aos/agrovoc/c_1653.
Ano: 1989
URL: http://hdl.handle.net/1834/2160

Essai d'interprétation de la dynamique sédimentaire par l'analyse granulométrique et minéralogique au large du golfe de Gabès
Provedor de dados: 20
Autores: Brahim, M.; Ben Amor, R.; Gueddari, M.
The results of the grain size and mineralogical analysis of the surface sediments of the Gulf of Gabes, taken with Various depths between the coast Sfax-Zarzis and the isobaths -100 m, allow to identify the origin of these sediments and to specify the factors and the phenomena, which are involved in their transport and their deposit. The mineralogical study resulted in high lighting a clear relation between the recent sedimentary stock of the gulf of Gabès and the bordering geological formations. The sediments study showed that the detritus materials are of continental origin and the sediments coming from the coastal erosion are subjected to a dynamics, which is controlled, primarily by the action of the currents (current coastal and currents tide and by...
Tipo: Journal Contribution
Palavras-chave: Grain size; Sediment analysis; Sediment chemistry; Sediments; Mineralogy.
Ano: 2003
URL: http://hdl.handle.net/1834/1118

Les métaux traces (Cd, Pb, Hg) et les hydrocarbures totaux dans les sédiments superficiels de la frange cotière du golfe de Gabès
Provedor de dados: 20
Autores: Chouba, L.; Mzougui-Aguir, N.
Dans l’objectif de déterminer l’état de la contamination organique et inorganique des sédiments superficiels de la frange côtière du golfe de Gabès, nous avons évalué les concentrations en hydrocarbures aromatiques totaux, en cadmium (Cd), en plomb (Pb) et en mercure (Hg).  L’échantillonnage a été effectué à bord d’une barque motorisée, à l’aide d’une benne Van Veen au niveau de 25 stations. Les concentrations du Cadmium et du Plomb ont été déterminées par Spectrométrie d’Absorption Atomique à Four Graphite (Varian 220Z) alors que pour le Mercure les analyses ont été réalisées par Spectrométrie d’Absorption Atomique à vapeur froide. Les hydrocarbures totaux ont été analysés par UV-Fluorescence (UV-F). Les concentrations du Cadmium et du Mercure dans la...
Tipo: Journal Contribution
Palavras-chave: Cadmium; Coastal waters; Hydrocarbons; Lead; Marine pollution; Mercury; Pollution monitoring; Sediments; Trace metals.
Ano: 2006
URL: http://hdl.handle.net/1834/4275

Optimización de una red de estaciones marinas para monitoreo en una bahía de bolsa
Provedor de dados: 20
Autores: Arencibia, G.; Capetillo, N.; Castro, M.; Ortega, A.
Las redes de estaciones de monitoreo o muestreos empleadas en estudios ambientales dentro de amplios ecosistemas marinos, como extensas bahías de bolsa, ocasionan enormes gastos económicos y de tiempo en las campañas de muestreo, además de imprecisiones estadísticas que no las hacen representativas. En este trabajo se emplean una serie de criterios que dan basamento para la recomendación de una nueva red de estaciones a partir de estudios previos de metales pesados, hidrocarburos, pesticidas y del bentos, los cuales permiten elaborar una red de monitoreo óptima. Se tuvieron en cuenta criterios diferentes y pruebas estadísticas de análisis multivariado. La red propuesta para estudios de indicadores biológicos del bentos y contaminantes en sedimentos queda...
Tipo: Journal Contribution
Palavras-chave: Multivariate analysis; Sediments; Benthos; Heavy metals; Hydrocarbon analysis; Pesticides.
Ano: 2011
URL: http://hdl.handle.net/1834/4649

Estudio de las características sedimentológicas de la zona litoral comprendida entre Anconcito y General Villamil (Playas), Provincia del Guayas, Ecuador
Provedor de dados: 20
Autores: Soledispa, B.
Cabe señalar que el presente artículo, ya que ha sido redactado sólo en base a los datos granulométricos, y parámetros estadísticos, sucederá otro, en el que se incluye, el estudio mineralógico y químico de los sedimentos.
Tipo: Journal Contribution
Palavras-chave: Sediments; Beaches; Littoral zone; Beaches; Http://aims.fao.org/aos/agrovoc/c_850.
Ano: 1992
URL: http://hdl.handle.net/1834/2298

Contenido de Cu, Co, Cr y Pb en sedimentos de tres estuarios de la costa sur de Cuba
Provedor de dados: 20
Autores: Arencibia Carballo, G.; Perigó, E.; Sosín, A.
The many fishing activities of the south area of the Counties Sancti Spíritus and Ciego de Ávila they are enough reason to make studies of levels of toxic elements in the silts. The obtained results of the determination of Cu, Co, Cr and Pb in silts of the estuaries and rivers Agabama, Zaza and Jatibonico of the South are discussed and compared. They are also related these elements with the percentage of volatile matter in the silts. These tributary of the south coast, nevertheless to be in the same line of coast of about 200 Km presents remarkable differences as for their relationships with urban populations, industries and agricultural works. The technique employee for determination of the concentrations of the metallic elements was the espectrofotometry...
Tipo: Journal Contribution
Palavras-chave: Marine pollution; Heavy metals; Spectrochemical analysis; Sediments; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 1988
URL: http://hdl.handle.net/1834/1882

distribution of phosphorus fractions and some of heavy metals in surface sediments of burullus lagoon and adjacent mediterranean sea
Provedor de dados: 20
Autores: Radwan, A.M.; Khalil, M.K.; El-Moselhy, K.M.
Twelve samples were collected from the surface sediments of lagoon and adjacent Mediterranean Sea. Samples were analyzed for grain size, total organic carbon (TOC), total carbonate (CaCO3), various forms of phosphorus and heavy metals (Fe, Mn, Zn, Cu, Ni, Co, Cd and Pb). The results indicated that the sediments were composed of sand, silt and clay enriched with carbonate (1.95 – 34.1%) and total organic carbon (0.06 and 3.62%). The total-P content ranged between 58 and 1186 μg/g, and the fraction associated with apatite minerals (PHCl) was the dominant (it constitutes about 50 – 73% of TP) implying that it was the main storage of phosphate. The various P phases demonstrated significant positive correlation with mean size, silt, clay, TOC, CaCO3 and TP,...
Tipo: Journal Contribution
Palavras-chave: Field Study; Sediments; Heavy metals; Lagoons; Heavy metals; Http://aims.fao.org/aos/agrovoc/c_2223.
Ano: 2007
URL: http://hdl.handle.net/1834/1888

Presencia de hidrocarburos en el litoral ecuatoriano, crucero de prospección pesquera T03/10/02D
Provedor de dados: 20
Autores: Chalén, F.
Los hidrocarburos fueron investigados en el área costera del Litoral Ecuatoriano bajo el proyecto ODEPLAN del INP. La información evaluada corresponde al mes de octubre del 2003. Se programaron un total de 42 sitios para el muestreo de sedimentos de fondo, los cuales fueron demarcados con un GPS (Global Positional System). Las muestras de sedimentos fueron colectadas utilizando draga Van Veen, las mismas que fueron analizadas de acuerdo a la metodología señalada por UNIESCO/COI/PNUMA y leídas por Espectrofluometría. La zona mayormente monitoreada fue la Subárea A correspondiente al estuario externo del Golfo de Guayaquil, la misma que no se encontró significativamente contaminada, seguida de las Subáreas B y C, puesto que la mayoría de las concentraciones...
Tipo: Journal Contribution
Palavras-chave: Hydrocarbons; Sediments; Organic compounds; Pollution; Hydrocarbon analysis.
Ano: 2010
URL: http://hdl.handle.net/1834/5373

Resultados del monitoreo realizado en la playa La Puntilla, Santa Fe, La Habana, durante los años 2010 – 2011
Provedor de dados: 20
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

Evidencia sedimentaria de tsunamis en la planicie aluvial de Villamil - Playas, Golfo de Guayaquil
Provedor de dados: 20
Autores: Chunga, K.; Quiñonez, M.F.
The Ecuadorian shoreline is considered highly susceptible to tsunamis events of tectonic origin due to its closeness to the Nazca and South America plates subduction zone. Since 1906, eight tsunamis events have been witnessed along this coast. All have been related to seismic activity (earthquakes between Ms 6.9 to 8.9) on or near the Ecuadorian platform. Such tectonic environment favours the generation and surge of tsunamis in this region. The study area is located in the outer area of the lower basin of the Guayas River, in what is referred as the Canton General Villamil Playas. Three cores were retrieved from the supratidal coastal plain around Villamil at different horizontal distances from the Pacific shoreline. Villamil 1 was cored at 1128 m from...
Tipo: Journal Contribution
Palavras-chave: Sediments; Marine geology; Tsunamis.
Ano: 2013
URL: http://hdl.handle.net/1834/5768

Distribution and Depositional History of some Pre-lagoonal Holocene Sediments in the Ciénaga Grande de Santa Marta, Colombia
Provedor de dados: 20
Autores: Cohen, A.D.; Wiedemann, H.U.
An investigation of the pre-lagoonal Holocene sediments beneath the lagoon Cienaga Grande de Santa Marta (Colombia), was undertaken for the purpose of this region before the formation of the lagoon proper. Core and grab samples were collected from the lagoon for stratigraphic observatiion and analysis in the laboratory.  Beneath the recent lagoonal sediments a deposits of peat with intercalated sand and clay was discovered. Its surface lies at a depth of about 2 m below the hydrographic zero level of the lagoon. Three peat samples, obtain from the upper portion of this deposits, were subjected to micropetrographic and pollen analyses. These analyses reveled that, prior to marine inundation, this region in southern Florida (U.S.A.) Sample "f", taken closest...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Estuaries; Geology; Sediments; Waste disposal; Estuaries; Geology; Waste disposal; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_3232; Http://aims.fao.org/aos/agrovoc/c_8305; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1973
URL: http://hdl.handle.net/1834/3246

Mercurio en sedimentos del litoral ecuatoriano, crucero de prospección pesquera T03/10/02D
Provedor de dados: 20
Autores: Chalen, F.
The present work was carried out in the coastal area of Ecuador under the Project ODEPLAN of the Instituto Nacional de Pesca. The evaluated information corresponds to samples collected on October 2003. Iniatially a total of 43 places were programmed for the sampling of bottom sediments, wich were demarcated with a GPS (Global Positional System). Even though there were collected a total of 41 sediments samples using a Van Veen drag, the same ones that were analyzed by Spectrophotometry of Atomic Absorption with Cold Vapor. The mercury was investigated in the total sediment as in the sediment ~,to 125 ~km, like a measure to evaluate its levels, to know its distribution in the study area that wich will allow the recognize certain events that happen with high...
Tipo: Journal Contribution
Palavras-chave: Mercury; Residual flow; Sediments; Sampling.
Ano: 2010
URL: http://hdl.handle.net/1834/5374

Estudio de las características sedimentológicas de la zona costera frente al balneario de Manta, Ecuador
Provedor de dados: 20
Autores: Soledispa P., B.
se estudian 17 muestras de sedimentos superficiales de fondo de la zona costera de Manta. Se presentan las características sedimentológicas en base al análisis granulométrico, parámetros estadísticos y distribución de los sedimentos. Se establece que los sedimentos arenosos predominan en el área, y se ubican en el lado oeste y este del área de estudio. También hay limo y mezclas de este con arena.
Tipo: Journal Contribution
Palavras-chave: Sediments; Sediment distribution; Granulometry; Statistical analysis; Statistical analysis; Http://aims.fao.org/aos/agrovoc/c_7378.
Ano: 2009
URL: http://hdl.handle.net/1834/3363

The Occurrence Of Some Distinct Areas In The N. W. Mediterranean Sea Based On The Elemental Properties Of The Sediment (Horizontal And Vertical Distribution)
Provedor de dados: 20
Autores: Hoogstraten, R.I.; Nolting, R.F.
As pan of the EROS-2000 project (European River Ocean Systems),sediment samples were collected in the North Western basin of the Mediterranean Sea in May 1990. In these samples trace and/or majorelements were determined to advance the knowledge about theconcentration, sources and cycles of natural and anthropogenicconstituents in coastal areas. Three fractions were determined: the porewater fraction whichcontains all dissolved elements the leachable fraction which containsall easily available elements and the residual fraction which containsthe strongly bound elements in the sediments. The results show thatthe investigated area can be separated into five "sub-areas" which aredifferent in element concentration, leachable fraction andsedimentary composition....
Tipo: Other
Palavras-chave: Sediments; Geology.
Ano: 1992
URL: http://hdl.handle.net/1834/443

Estudio sedimentológico de la laguna costera El Soldado, Sonora, México
Provedor de dados: 20
Autores: Olivas Silva, R.; De la O Villanueva, M.; Villalba, A.I.
El presente trabajo pretende contribuir a un conocimiento más amplio en la naturaleza del medio sedimentario de un cuerpo de agua del litoral de Sonora, tomando en consideración elementos ambientales básicos como son:  fisiografía, geomorfología, materiales, energía, caracteríisticas físicas y químicas de los sedimentos y un análisis sobre organismos bentónicos (bivalvos).
Tipo: Journal Contribution
Palavras-chave: Sediments; Coastal lagoons; Lagoonal sedimentation; Sediment chemistry; Sediment distribution; Sediment texture; Coastal lagoons; Http://aims.fao.org/aos/agrovoc/c_1697.
Ano: 1996
URL: http://hdl.handle.net/1834/2195

Réponse des différents taxons méiofaunistiques à la contamination par un antibiotique (la Penicilline G) : étude microcosmique.
Provedor de dados: 20
Autores: Nasri, A.; Boufahja, F.; Hedfi, A.; Mahmoudi, E.; Aissa, P.; Essid, N.
Une étude microcosmique a été réalisée pour déterminer l’effet d’un antibiotique (la Pénicilline G) sur une communauté méiofaunistique prélevée au niveau des sédiments de la lagune de Bizerte (Nord de la Tunisie).Cinq doses croissantes de ce contaminant émergent (D1 : 3 mg.L-1, D2 : 30 mg. L-1, D3 : 300 mg. L-1, D4 : 600 mg. L-1 et D5 : 700 mg. L-1), ont été mises en examen pendant 30 jours d’exposition. Les densités méiofaunistiques moyennes ont été très fluctuantes en comparant les microcosmes témoins avec ceux traités. Les microcosmes témoins ont été associés à une densité moyenne de 91 ± 22 ind. mic-1. Une prolifération numérique de la méiofaune a été observée lors de son exposition aux doses les plus faibles du contaminant. Ainsi, une valeur moyenne...
Tipo: Journal Contribution
Palavras-chave: Meiobenthos; Density; Microcosms; Sediments.
Ano: 2013
URL: http://hdl.handle.net/1834/5907

Etat environnemental de la lagune de Boughrara et ses alentours deux ans après les travaux d'aménagement et d'élargissement du pont d'el Kantara
Provedor de dados: 20
Autores: Ghuetat, F.; Sellem, F.; Akrout, F.; Brahim, M.; Atoui, A.; Ben Romdhane, M.S.; Daly, Yahia, M. N.
L’étude de l’état environnemental de la lagune de Boughrara a été réalisée deux ans après la mise en service du nouveau pont El Kantara. Les paramètres étudiés dans l’eau (nitrites, nitrates, ammonium, azote, phosphore total, chlorophylle a) et le sédiment (matière organique, faciès sédimentaire) ont été analysés dans trois zones de la lagune appartenants à divers contextes géographiques et environnementaux. Les résultats obtenus ont montré d’évidents signes d’amélioration des conditions générales de cet écosystème. Les distributions spatiotemporelles et saisonnières des paramètres étudiés indiquent que les teneurs trouvées atteignent le seuil d’eutrophisation pas mal de fois mais restent toujours inférieurs à ceux mentionnés par la DGPA en 2000 avant les...
Tipo: Journal Contribution
Palavras-chave: Water quality; Coastal lagoons; Sediments; Abiotic factors; Coastal lagoons; Environmental assessment.
Ano: 2012
URL: http://hdl.handle.net/1834/5316

An Overview of the Concept of Regional Sediment Management.
Provedor de dados: 20
Autores: Lei, Huaiyan; Basoglu,Serif; Shi, Yuezhong; Lin, Binghuang; Gong, Chenlin.
In this article we described the concept of “regional sediment management” (RSM), and identified opportunities for and impediments to implementing regional approaches to sediment management, and also summarized the background information and applications of RSM. Furthermore, we considered the needs of RSM studies and, suggested the framework for developing RSM strategies, and described the specific studies for the Xiamen region.
Tipo: Journal Contribution
Palavras-chave: Coastal zone; Dredging; Sediments.
Ano: 2007
URL: http://hdl.handle.net/1834/5864

Distribución y enriquecimiento de metales traza en núcleos de sedimento de tres sistemas costeros del Estado de Sonora, México
Provedor de dados: 20
Autores: Ortega Romero, P.; Vásquez del Castillo, D.
Este trabajo tiene como objetivo principal, conocer el enriquecimiento y distribución de los metales traza y su relación con la materia organic y el tamaño medio de partícula (Mz) en la columna sedimentaria con el fin de determinar su acción e influencia ecológica en el medio ambiente marino.
Tipo: Journal Contribution
Palavras-chave: Distribution; Trace metals; Sediments; Inorganic matter; Organic matter; Distribution; Organic matter; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_5387.
Ano: 1992
URL: http://hdl.handle.net/1834/2299

Assessment of some heavy metals, major cations and organic matter in the recent sediments of Bardawil Lagoon, Egypt
Provedor de dados: 20
Autores: Abdo, M.H.
The aim of the present study is to gather detailed information on the distribution and concentration levels of some heavy metals (Fe, Mn, Zn, Cu, Pb &amp; Cd), major cations (Ca,Mg, Na &amp; K), in addition to organic matter in the Bardawil lagoon sediments during four successive seasons during (2001-2002). The different metals concentrations could be arranged in descending order as follows: - Ca&gt; Na&gt; Fe&gt; Mg&gt; K&gt; Mn&gt; Cu&gt; Zn&gt; Pb&gt; Cd.
Tipo: Journal Contribution
Palavras-chave: Sediments; Egypt; Bardawil Lake Abiotic factors Heavy metals.
Ano: 2005
URL: http://hdl.handle.net/1834/1299

Nematodes as indicators pollution: a case study from the Swartkops River system, South Africa
Provedor de dados: 27
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

Elemental concentrations and heavy metal pollution in sediments and suspended matter from the Belgian North Sea and the Scheldt estuary
Provedor de dados: 27
Autores: Van Alsenoy, V.; Bernard, P.; Van Grieken, R.
The elemental composition of sediment and suspended matter samples from the Belgian coastal and offshore regions of the Southern Bight of the North Sea and from the Scheldt estuary has been determined using X-ray fluorescence and atomic absorption spectrometry.Special attention was given to the heavy metals of the black and grey lists. The bulk sediment and the clay/silt fraction were analyzed. The average heavy metal contents in the fraction &lt;63 µm were comparable to the levels in the suspended matter. Different normalization techniques led to the identification of two different populations of sediments. Most of the sediments were enriched in Cd, Cr, Hg, Pb and Zn but no enrichment was found for Cu and Ni. Comparing these data with older data indicates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Pollution; Sediments; Suspended particulate matter.
Ano: 1993
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2789

An experiment on the relative importance of denitrification, nitrate reduction and ammonification in coastal marine sediment
Provedor de dados: 27
Autores: Goeyens, L.; De Vries, R.T.P.; Bakker, J.F.; Helder, W.
Simultaneous determinations of &lt;sup&gt;15&lt;/sup&gt;N-nitrogen gas production, &lt;sup&gt;15&lt;/sup&gt;N-ammonia formation by nitrate reduction and ammonia production from organic nitrogen were carried out after addition of &lt;sup&gt;15&lt;/sup&gt;N-nitrate to anaerobically incubated sediment slurries from a location in the Dutch Wadden Sea. The rate of nitrogen gas production was 1.75 µmol N.cm&lt;sup&gt;-3&lt;/sup&gt; wet sediment.d&lt;sup&gt;-1&lt;/sup&gt;, nitrate reduction to ammonia occurred to a rate of 0.79 µmol N.cm &lt;sup&gt;-3&lt;/sup&gt;.d &lt;sup&gt;-1&lt;/sup&gt; and ammonification at 1.17 µmol N-cm &lt;sup&gt;-3&lt;/sup&gt;.d &lt;sup&gt;-1&lt;/sup&gt;. At the end of the incubation experiment (after 30 h) 63% of the originally added...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Biogeochemical cycle; Coastal zone; Denitrification; Nitrates; Nitrogen cycle; Sediments.
Ano: 1987
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3169

Sedimentologische kartering van mariene bodemsedimenten aan de hand van akoestische parameters
Provedor de dados: 27
Autores: De Maeyer, P.
Cartography of sea-floor sediments is troubled by the limited number of observation points. The new techniques that have come up and their use allow for calculation of acoustic parameters (speed and reflection coefficient) that can be correlated with sedimentological parameters.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acoustic properties; Cartography; Sediments.
Ano: 1981
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3706

Physical properties of sand and mud sediments
Provedor de dados: 27
Autores: Malherbe, B.; Bastin, A.; De Putter, B.
The equations are set up to calculate the initial rigidity, Ty, of mud deposits as a function of specific mass and composition. This rigidity seems to be the most general characteristic of mud to describe its physical behaviour, under wave and current action. The threshold criterion for sand bottoms is described as measured by flume experiments (wave and currents). All these fundamental results are used to solve problems like sedimentation, erosion and navigation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mud flats; Sand banks; Sediments.
Ano: 1983
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3351

Workshop Report: Advancing the Art of Analyzing Risks and Benefits of Dredged Material Management
Provedor de dados: 31
Autores: Wilson,   James D.
The U.S. Army Corps of Engineers has been delegated responsibility for assuring the navigability of waters designated for that purpose in the United States. Dredging is among the activities required to fulfill this responsibility. In some places, the Corps finds difficulty in carrying out dredging projects because it lacks spaces where the sediments that must be removed ("dredged materials") can be placed or otherwise managed. In these cases, the public has expressed concerns about the impacts of dredged materials on the environment, either underwater or on land ("upland"). Thus, the Corps often finds it necessary to be able to evaluate and describe the costs or risks and the benefits of the possible alternatives that may be available. Scientists and...
Tipo: Working or Discussion Paper
Palavras-chave: Dredging; Risk; Benefit; Cost; Analysis; Characterization; Accidents; Mixtures; Sediments; Non-use benefits; Decision tools; Environmental Economics and Policy.
Ano: 2002
URL: http://purl.umn.edu/10617