Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados ArchiMer (4) Autor De Rafelis, Marc (4) Emmanuel, Laurent (4) Lartaud, Franck (4) Renard, Maurice (4) Ropert, Michel (3) Labourdette, Nathalie (2) Geairon, Philippe (1) Huyghe, Dimitri (1) Pouvreau, Stephane (1) Richardson, Christopher A. (1) Mais... Palavra-chave Cathodoluminescence (2) Crassostrea gigas (2) Stable isotopes (2) Kinetic isotope effect (1) Manganese markings (1) Mollusk shells (1) Oyster shells (1) Palaeotemperatures (1) Paleoclimatology (1) Sclerochronology (1) Sclerogeochemistry (1) Seasonal growth patterns (1) Seasonality (1) Mais... Tipo do documento Text (4) Ano 2020 (1) 2010 (3) País France (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última A latitudinal gradient of seasonal temperature variation recorded in oyster shells from the coastal waters of France and The Netherlands ArchiMer Lartaud, Franck; Emmanuel, Laurent; De Rafelis, Marc; Ropert, Michel; Labourdette, Nathalie; Richardson, Christopher A.; Renard, Maurice. Cathodoluminescence (CL) microscopy of the foliated calcite shell hinge sections of live-collected oyster Crassostrea gigas collected at seven locations along a latitudinal gradient from the Netherlands in the North Sea to the Atlantic coast of France, revealed variations in luminescence that were attributable to seasonal variations in calcification of the hinge. Photomicrographs of hinge sections and luminescence profiles were analyzed to define a micro-sampling strategy that was adopted to drill the hinge samples to determine their isotopic composition. Reconstructed seasonal seawater temperatures determined from the stable oxygen isotope (delta O-18) composition along growth profiles from 32 oyster shell hinges showed distinct seasonal isotopic cycles... Tipo: Text Palavras-chave: Seasonality; Palaeotemperatures; Stable isotopes; Cathodoluminescence; Crassostrea gigas; Mollusk shells. Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/publication-7296.pdf Influence of food supply on the delta C-13 signature of mollusc shells: implications for palaeoenvironmental reconstitutions ArchiMer Lartaud, Franck; Emmanuel, Laurent; De Rafelis, Marc; Pouvreau, Stephane; Renard, Maurice. Compared to oxygen isotopes, the carbon isotope composition of biogenic carbonates is less commonly used as proxy for palaeoenvironmental reconstructions because shell delta C-13 is derived from both dissolved inorganic (seawater) and organic carbon sources (food), and interactions between these two pools make it difficult to unambiguously identify any independent effect of either. The main purpose of this study was to demonstrate any direct impact of variable food supply on bivalve shell delta C-13 signatures, using low/high rations of a C-13-light mixed algal diet fed to 14-month-old (adult) cultured Japanese Crassostrea gigas under otherwise essentially identical in vitro conditions during 3 summer months (May, June and July 2003, seawater temperature... Tipo: Text Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/publication-7435.pdf Mn labelling of living oysters: Artificial and natural cathodoluminescence analyses as a tool for age and growth rate determination of C. gigas (Thunberg, 1793) shells ArchiMer Lartaud, Franck; De Rafelis, Marc; Ropert, Michel; Emmanuel, Laurent; Geairon, Philippe; Renard, Maurice. We developed a growth model for Crassostrea gigas oyster shells based on the use of in situ temporal manganese markings to calibrate natural cathodoluminescence (CL) changes in the shell hinge sections. A 30 min to 4-h exposure period with Mn2+ (90-120 mg l(-1)) was sufficient to create a detectable mark in the shells. This makes the Mn2+ markings the fastest mollusc shells marking technique to date. The natural CL from juvenile and adult shells cultured in four standard shellfish-farming locations along the English Channel and French Atlantic coasts, exhibited a seasonal pattern (maximum CL intensity occurring during summer periods, minimum CL intensity occurring during winter). Hydrobiological data recorded at Baie des Veys site allows us to attribute... Tipo: Text Palavras-chave: Oyster shells; Crassostrea gigas; Manganese markings; Cathodoluminescence; Seasonal growth patterns. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11300/7912.pdf Oxygen isotope disequilibrium in the juvenile portion of oyster shells biases seawater temperature reconstructions ArchiMer Huyghe, Dimitri; Emmanuel, Laurent; De Rafelis, Marc; Renard, Maurice; Ropert, Michel; Labourdette, Nathalie; Lartaud, Franck. For decades, bivalve shells have constituted one of the most common supports for paleoclimatic archives based on stable isotope approaches. In this work, we conducted chemical marking and recapture techniques to study the fluctuation of δ18O values of oyster shells of the species Magallana gigas reared in natural environment in Normandy (France) for two years. The results were compared to the continuous monitoring of temperature and salinity and monthly records of seawater δ18O. Isotopic measurements were performed on the hinge area that regroups the whole life of the oysters. Here we demonstrate that oysters mineralized their shells with no significant growth breaks during the two-years experiment, even at temperatures below 6 °C. The results confirm that... Tipo: Text Palavras-chave: Stable isotopes; Paleoclimatology; Sclerogeochemistry; Sclerochronology; Kinetic isotope effect. Ano: 2020 URL: https://archimer.ifremer.fr/doc/00624/73622/73038.pdf Registros recuperados: 4 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco