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Registros recuperados: 7
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Analyse des résultats d'une ferme d'élevage de crevettes sur 20 années : SODACAL 1984-2004. "Elasticité" de la capacité de production d'un écosystème bassin crevetticole ArchiMer
Della Patrona, Luc.
SODACAL prawn farm which was set up as a pilot farm for the development of a prawn industry in New Caledonia, saw its production exponentially rise from 1984 to 1992 (to 400 t/year, then experienced a sharp drop in 1993 (250 t/year) which carried on until 1997, and finally rose back to a stabilizing level around 400 t/year until 1999. The study analyses the difficulties observed before and during the drop of production. Among them, mortality outbreaks, other biological perturbations (benthic mat clearing and crab and fish mortality) and focus on the noxious state of the bottom (reduced and smelling sulfide hydrogen). It particularly shows that Syndrome 93 outbreaks could be observed on this farm from 1990. The analysis highlights the particular climatic...
Tipo: Text Palavras-chave: New Caledonia; Zootechny; Climate; Ecosystem; Lethal factor; Mortality; Production; Pond culture; Shrimp culture; Climat; Facteur léthal; Bassin élevage; Zootechnie; Dysfonctionnement; Production; Nouvelle Calédonie; Aquaculture.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/rapport-718.pdf
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Comment prendre en compte les effets de l'environnement sur la qualité des fruits ? A l'échelle de la plante ou du fruit ? National Institute of Agronomic Research
Gauthier, Hélène.
Tipo: Other Palavras-chave: Fruit quality; Ecophysiology; Genetics; Cultural practice; Climate; Qualité du fruit; Écophysiologie; Échelle de l'étude; Pratique culturale; Climat; Génétique.
Ano: 2004 URL: http://hdl.handle.net/2174/319
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Comprendre la structure et la dynamique du phytoplancton en réponse aux forçages naturels et anthropiques, et contribuer au développement des outils d’analyses automatisées. Vers un Système Intégré d’Observation. ArchiMer
Lefebvre, Alain.
Les écosystèmes marins sont soumis à des pressions d’origine anthropique très importantes depuis ces dernières décennies. Parmi ces pressions, les apports excessifs de nutriments vont impacter directement le phytoplancton et indirectement d’autres niveaux trophiques compromettant ainsi les biens et services écosystèmiques. On parle alors d’eutrophisation, phénomène répandu à l’échelle mondiale. La Manche orientale et la baie sud de la mer du Nord ne font pas exception. La partie française de cette zone est marquée par des proliférations massives de la Prymnésiophycée, Phaeocystis globosa, qui aboutiront au développement d’une mousse abondante et nauséabonde sur le littoral comme à des dysfonctionnements au sein des habitats benthique et pélagique. C’est...
Tipo: Text Palavras-chave: Manche; Baie sud de la mer du Nord; Eutrophisation; Habitat pélagique; Phytoplancton; Abondance; Diversité; Hydrologie; Climat; Observation; Surveillance; Écologie numérique; Modélisation; Haute fréquence; Systèmes automatisés; Stations instrumentées; Ferry Box..
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00360/47103/47027.pdf
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Enregistrements stratigraphiques des cycles climatiques et eustatiques du Quaternaire terminal - Modélisations de la marge continentale du Golfe du Lion. ArchiMer
Jouet, Gwenael.
Earth's climate oscillated during the Late Quaternary following the major glacial-interglacial cycles. These well-known variations influenced continental and marine sedimentary records worldwide. However, the associated changes of global sea-level and of environmental factors are not precisely documented, neither are their stratigraphic signatures. The extensive geophysical and sedimentological investigations carried out in the Gulf of Lions (Western Mediterranean) since the early 90's allow us to explore the expanded sedimentary records preserved on this continental margin during the Late Quaternary. The combination of high sediment supply (largely from Alpine glaciers) and significant subsidence favoured an almost continuous record, at the shelf edge, of...
Tipo: Text Palavras-chave: Late Quaternary; Lithology; Seismic; Gulf of Lions; Stratigraphic modelling; Glacio Eustatic cycles; Climate; Deltaic margin; Sequence Stratigraphy; Quaternaire terminal; Lithologie; Sismique; Golfe du Lion; Modélisations stratigraphiques; Cycles Glacio Eustatiques; Climat; Marge deltaïque; Stratigraphie Séquentielle.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3692.pdf
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Facteurs de contrôle sur le fonctionnement du système turbiditique du Rhône depuis le Dernier Maximum Glaciaire ArchiMer
Lombo Tombo, Swesslath.
Turbidite systems are accumulations of fluvial sediment on the continental margins. They are mainly made of « turbidites » deposited after the flow of turbidity currents inside submarine canyons and channels. Their structure and composition are controlled by global and regional environmental changes such as sea level and climate. The two fundamental parameters that govern their functioning are the production of sediment in the river watersheds and the capability and reactivity of the transfer to the turbidite system. In this work we show that for the last 24,000 years the functioning of the Rhone turbidite system has shown rapid changes under the control of sea level and sediment production fluctuations. Our results are based on a millennial time-scale...
Tipo: Text Palavras-chave: Hyperpycnite; Turbidites; Système turbiditique du Rhône; Facteurs de contrôle; Niveau marin; Climat; Morphologie; Golfe du Lion; Méditerranée occidentale; Hyperpycnites; Turbidites; Rhone turbidite system; Control factors; Sea level; Climate; Morphology; Gulf of Lions; Western Mediterranean.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00274/38505/37013.pdf
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Interactions basses fréquences océan-atmosphère dans l’océan Austral ArchiMer
Maze, Guillaume.
Patterns of interannual variability of the ocean- atmosphere coupled system in the Southern Hemisphere ex- tratropics are studied with a simple dynamical model, in or- der to determine the basic physical processes of interaction independently of tropical forcing. The model used is an at- mospheric quasi-geostrophic model coupled to a "slab" oceanic mixed layer, which includes mean geostrophic advection by the Antarctic Circumpolar Current (ACC). The ocean-atmosphere coupling occurs through surface heat fluxes and Ekman cur- rent heat advection. In a fully coupled simulation, the atmos- pheric part of the model, which includes high frequency tran- sient eddies at midlatitudes, exhibits a strong Southern Annu- lar Mode (SAM) as the first mode of variability...
Tipo: Text Palavras-chave: Climat; Océan Austral; Mode annulaire; Basse fréquence; Interactions océan-atmosphère; Variabilité; Climat; Southern Ocean; Annular mode; Low frequency; Ocean-atmosphere interactions; Variability.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/00186/29734/28147.pdf
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Reconstruction des transferts sédimentaires en provenance du système glaciaire de Mer d'Irlande et du paléofleuve Manche au cours des derniers cycles climatiques ArchiMer
Toucanne, Samuel.
The Pleistocene has been period of fluctuating climate accompanied by prominent sea-level lowstands during the glacial intervals, when massive continental ice sheets extended from mountainous to lowland European areas. The retreat of the shoreline on the extensive present-day shallow continental shelf of the southern part of the British Isles induced the appearance of the 'Fleuve Manche' palaeoriver, one of the largest systems that drained the European continent. Sedimentary records from the Bay of Biscay offer an independent record allowing the reconstruction of the freshwater and sediment discharges of the 'Fleuve Manche', and the possibility of detecting the imprint of surrounding ice-sheet oscillations and attendant modification of hinterland drainage...
Tipo: Text Palavras-chave: Land sea correlations; European fluvial system; Glacial Irish Sea system; 'Fleuve Manche' palaeoriver; Ice sheets; Glaciations; Climate; Pleistocene; Turbidite systems; Sediment transfer; Bay of Biscay; Corrélations terre mer; Réseau de drainage européen; Système glaciaire de Mer d'Irlande; Fleuve Manche; Calottes glaciaires; Glaciations; Climat; Pléistocène; Systèmes turbiditiques; Transferts sédimentaires; Golfe de Gascogne.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6328.pdf
Registros recuperados: 7
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