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| Registros recuperados: 108 | |
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| Tual, Nicolas; Carrere, N.; Davies, Peter; Bonnemains, T.; Lolive, E.. |
| In recent years, many tidal turbine projects have been developed using composites blades. Tidal turbine blades are subject to ocean forces and sea water aggressions, and the reliability of these components is crucial to the profitability of ocean energy recovery systems. The majority of tidal turbine developers have preferred carbon/epoxy blades, so there is a need to understand how prolonged immersion in the ocean affects these composites. In this study the long term behaviour of different carbon/epoxy composites has been studied using accelerated ageing tests. A significant reduction of composite strengths has been observed after saturation of water in the material. For longer immersions only small further changes in these properties occur. No... |
| Tipo: Text |
Palavras-chave: Carbon; Seawater ageing; Diffusion; Mechanical testing. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00278/38964/37504.pdf |
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| Majkut, Joseph D.; Carter, Brendan R.; Froelicher, Thomas L.; Dufour, Carolina O.; Rodgers, Keith B.; Sarmiento, Jorge L.. |
| The Southern Ocean is critically important to the oceanic uptake of anthropogenic CO2. Up to half of the excess CO2 currently in the ocean entered through the Southern Ocean. That uptake helps to maintain the global carbon balance and buffers transient climate change from fossil fuel emissions. However, the future evolution of the uptake is uncertain, because our understanding of the dynamics that govern the Southern Ocean CO2 uptake is incomplete. Sparse observations and incomplete model formulations limit our ability to constrain the monthly and annual uptake, interannual variability and long-term trends. Float-based sampling of ocean biogeochemistry provides an opportunity for transforming our understanding of the Southern Ocean CO2 flux. In this work,... |
| Tipo: Text |
Palavras-chave: Carbon; Southern Ocean; Observational system simulation experiment. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40115/38747.pdf |
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| Schmittner, Andreas; Bostock, Helen C.; Cartapanis, Olivier; Curry, William B.; Filipsson, Helena L.; Galbraith, Eric D.; Gottschalk, Julia; Carlos Herguera, Juan; Hoogakker, Babette; Jaccard, Samuel L.; Lisiecki, Lorraine E.; Lund, David C.; Martinez-mendez, Gema; Lynch-stieglitz, Jean; Mackensen, Andreas; Michel, Elisabeth; Mix, Alan C.; Oppo, Delia W.; Peterson, Carlye D.; Repschlaeger, Janne; Sikes, Elisabeth L.; Spero, Howard J.; Waelbroeck, Claire. |
| The carbon isotope composition (C-13) of seawater provides valuable insight on ocean circulation, air-sea exchange, the biological pump, and the global carbon cycle and is reflected by the C-13 of foraminifera tests. Here more than 1700 C-13 observations of the benthic foraminifera genus Cibicides from late Holocene sediments (C-13(Cibnat)) are compiled and compared with newly updated estimates of the natural (preindustrial) water column C-13 of dissolved inorganic carbon (C-13(DICnat)) as part of the international Ocean Circulation and Carbon Cycling (OC3) project. Using selection criteria based on the spatial distance between samples, we find high correlation between C-13(Cibnat) and C-13(DICnat), confirming earlier work. Regression analyses indicate... |
| Tipo: Text |
Palavras-chave: Carbon; Isotopes; Benthic; Foraminifera; Calibration. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00661/77326/78788.pdf |
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| Pernet, Fabrice; Browman, Howard I. |
| Aquaculture now produces more seafood than wild capture fisheries and this production is expected to at least double by 2050. Representing almost half of global production, marine aquaculture will contribute to sustainably feeding the growing humanity. However, climate change will undoubtedly challenge the future growth of marine aquaculture. Temperature and sea-level rise, shifts in precipitation, freshening from glacier melt, changing ocean productivity, and circulation patterns, increasing occurrence of extreme climatic events, eutrophication, and ocean acidification are all stressors that will influence marine aquaculture. The objective of this themed article set was to bring together contributions on the broad theme of the potential impacts,... |
| Tipo: Text |
Palavras-chave: Adaptation; Bivalve; Blue economy; Carbon; Climate change; Marine diseases; Mitigation; Ocean acidification; Plasticity; Salmon; Seaweed; Sustainability. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00682/79406/81951.pdf |
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| Belloni, Bruno; Sartoretto, Stephane; Cresson, Pierre; Bouchoucha, Marc; Guillou, Gael; Lebreton, Benoit; Ruitton, Sandrine; Harmelin-vivien, Mireille. |
| The coralligenous ecosystem is one of the biodiversity hotspots in the Mediterranean Sea. This study aims at determining (i) the organic matter (OM) sources at the base of the food web in a coralligenous ecosystem near Marseille (Cap Caveau, Frioul Island) and (ii) the global functional structure of its community. For that purpose, C and N stable isotope analyses were performed on 78 compartments or species collected in this habitat between 30 and 40 m depth. Results suggested that the pelagic particulate organic matter (POM), mainly composed of phytoplankton, was the main OM source fuelling coralligenous food webs, followed by sedimented organic matter (SOM) and some macrophytes. At least three level of consumers were identified from... |
| Tipo: Text |
Palavras-chave: Food webs; Coralligenous ecosystem; Stable isotopes; Carbon; Nitrogen. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00483/59511/62396.pdf |
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| Jauzein, Cecile; Collos, Yves; Laabir, Mohamed; Vaquer, Andre. |
| Uptake rates of three potential N-sources (ammonium, nitrate and N-urea) and two potential C-sources (HCO(3)(-) and C-urea) were estimated during growth of Alexandrium catenella in both light and dark phases. According to the variations observed in (13)C-isotopic ratio, A. catenella cells were not able to use C-urea. Furthermore, decreases in (13)C cell content during darkness revealed a probably high involvement of C recently fixed in dark respiration. Dark N-uptake capacities of A. catenella were characterized by dark/light uptake ratio of 27%, 43% and 65% for NO(3)(-), NH(4)(+) and N-urea, respectively. An accumulation of C-rich compounds during the light period was highlighted through strong diel variations in C:N ratio and would provide C and energy... |
| Tipo: Text |
Palavras-chave: Diel cycle; Dark uptake; Nitrogen; Carbon; Uncoupling; Alexandrium catenella. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00056/16699/14199.pdf |
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| Pichot, Paul; Deslous-paoli, Jean-marc; Juge, Claude. |
| Thau is a mediterranean lagoon with a large productive stock of molluscs (oysters, mussels) cultivated on suspended tines and colonised by epibionta (ascidia and others invertebrates, algae, etc ... ). This study was developed as part of the PNOC-OXYTHAU.programme. Its aim was to analyze the effects of oyster farrning on water-mass surrounding structures loaded with suspended molluscs and proximal watermass separating these structures. This study concems particulate suspended matter and deposits of particulate organic matter on the bottom after sedimnentation. Biochemical measurements were carried out for nitrogen, carbon, proteins, lipids and carbohydrates. ln order to estimate sedimentaton, bottom sediment traps were used |
| Tipo: Text |
Palavras-chave: Méditérranée; Etang de Thau; Matière en suspension; Azote; Carbone; Protites; Lipides; Glucides; Sédimentation; Mediterranean; Lagoon of Thau; Particulate suspended mattter; Nitrogen; Carbon; Proteins; Lipids; Carbohydraes; Sedimentation. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00425/53662/54501.pdf |
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| Rocha,Adélia R. M.; Di Beneditto,Ana Paula M.; Pestana,Inácio A.; Souza,Cristina Maria M. de. |
| ABSTRACT The aim of this study was to evaluate the isotopic profile and mercury (Hg) concentrations in fish (carnivores, omnivores and detritivores) in the lower portion of the rio Paraíba do Sul watershed, southeastern Brazil. Carbon (δ13C) isotopic analyses revealed that pelagic and benthonic sources are part of the feeding of the fish from the different guilds (-14.0 to -24.8 ‰). The benthic sources are usually enriched in δ13C (-16.9‰, from watershed runoff) compared to pelagic sources because the phytoplankton, important primary producer that supports several pelagic chains, has δ13C signature lighter (-23.9‰). The nitrogen (δ15N) isotopic signatures indicated that most guilds were at the same trophic position (10.0 to 15.5 ‰), except for pelagic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carbon; Freshwater; Hg; Nitrogen; Trophic guilds. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400723 |
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| Macia, A.. |
| A study to estimate the relative importance of mangrove primary carbon and nitrogen sources to five commercial penaeid shrimps species was done at Saco da Inhaca, a non-estuarine mangrove-fringed bay on Inhaca Island, southern Mozambique. Carbon and nitrogen stable isotope ratios were determined in a variety of primary producers (mangroves, epiphytes, phytoplankton and seagrasses), sediments and in five penaeid shrimp species (Penaeus (Fenneropenaeus) indicus, P. japonicus, P. semisulcatus, Metapenaeus monoceros and M. stebbingi), collected within the bay in different habitats and during two different periods. The penaeid shrimps showed 13C values ranging from â 13 to â 19 â °, (average of â 15.6 ± 0.4 â °, n=19) which is highly enriched compared to... |
| Tipo: Journal Contribution |
Palavras-chave: PENAEUS INDICUS; METAPENAEUS MONOCEROS; METAPENAEUS STEBBINGI; PENAEUS SEMISULCATUS; MARSUPENAEUS JAPONICUS; Shrimp culture; Nitrogen; Mangrove swamps; Carbon; Isotopes; Penaeid shrimp fisheries. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1120 |
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| Moens, T.; Vincx, M.. |
| Observations on living estuarine nematodes show that previous feeding type classifications do not accurately represent the trophic structure of an intertidal mudflat in the Westerschelde Estuary (Netherlands). A new scheme with six major nematode feeding guilds is proposed: (1) microvores; (2) ciliate feeders; and (3) deposit feeders sensu stricto are all nematodes without a distinct buccal armature. In the first two groups bacteria and protozoa, respectively are the major particulate food sources, while other items are included in the diet of the third. The three other categories are recognized among the nematodes with a buccal armature: (4) epigrowth feeders; (5) facultative predators; and (6) predators. Diatoms and other microalgae are an important... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biology; Biomass; Carbon; Habits; Habits; Meiobenthos; Water. |
| Ano: 1997 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7298 |
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| D’Andrea, Alexandre Fonseca; Silva, Marx Leandro Naves; Freitas, Diego Antonio França de; Curi, Nilton; Silva, Carlos Alberto. |
| Soil is an important compartment of carbon in terrestrial ecosystem, retaining substantial quantity of this element in organic forms, mainly in forest areas. The understanding of the factors that affect the fluxes of soil CO2 is the basic to the reduction of emissions of greenhouse gases to the atmosphere. The objective of this work was to evaluate the patterns of spatial variability of soil CO2 flux in native forest in a very clayey dystroferric Red Latosol (Oxisol), in Lavras city, Minas Gerais state, Brazil. A grid of 32 points was delimited, regularly spaced in 5 m distance, in which the CO2 flux and environmental factors (water evaporation, temperature and soil moisture) and attributes related to fertility (pH, base soil saturation and exchangeable... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental factors; Carbon; Organic matter; Linear correlation. fatores ambientais; Carbono; Matéria orgânica; Correlação linear. |
| Ano: 2010 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/169 |
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| Virgens, Aline Pereira; Barreto-Garcia, Patrícia Anjos Bittencourt; Paula, Alessandro de; Carvalho, Flávia Ferreira de; Aragão, Mariana de Aquino; Monroe, Paulo Henrique Marques. |
| Estudos sobre quantificação de biomassa florestal na Caatinga ganham importância diante da escassez de informações relacionadas ao tema no bioma e, em particular, no estado da Bahia. Este estudo teve como objetivo avaliar os estoques de biomassa e sua distribuição nos componentes da parte aérea de espécies florestais de maior densidade populacional e o potencial de utilização do fator de expansão de biomassa (FEB) médio para obtenção de estimativas de biomassa aérea em área de Caatinga localizada na Floresta Nacional Contendas do Sincorá, BA. A biomassa foi quantificada pelo método destrutivo. Foram selecionadas e abatidas árvores representativas das nove espécies de maior densidade populacional, distribuídas em três classes diamétricas. As quantidades... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal Floresta nacional; Biomassa acima do solo; Carbono National Forest; Above-ground biomass; Carbon. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1465 |
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| Registros recuperados: 108 | |
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