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Registros recuperados: 67
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A whirling ecosystem in the equatorial Atlantic ArchiMer
Menkes, Christophe; Kennan, Sc; Flament, Pierre; Dandonneau, Y; Masson, S; Biessy, B; Marchal, E; Eldin, G; Grelet, J; Montel, Y; Morliere, A; Lebourges-dhaussy, A; Moulin, C; Champalbert, G; Herbland, Alain.
[1] The equatorial Pacific and Atlantic oceans exhibit remarkable meridional undulations in temperature and chlorophyll fronts visible from space over thousands of kilometers and often referred to as tropical instability waves. Here, we present new observations of an ecosystem ranging through three trophic levels: phytoplankton, zooplankton and small pelagic fish whirling within a tropical vortex of the Atlantic ocean and associated with such undulations. Cold, nutrient and biologically rich equatorial waters are advected northward and downward to form sharp fronts visible in all tracers and trophic levels. The equatorward recirculation experiences upwelling at depth, with the pycnocline and ecosystem progressively moving toward the surface to reconnect...
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Ano: 2002 URL: http://archimer.ifremer.fr/doc/00000/10049/9584.pdf
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Activité bactérienne dans l'upwelling mauritanien : relation avec l'oxygène et la matière organique IRD
Herbland, Alain.
Tipo: Text Palavras-chave: ACTIVITE BIOLOGIQUE; BACTERIE; ANALYSE QUANTITATIVE; ASSIMILATION; RESPIRATION; RENDEMENT; VARIATION SPATIALE; OXYGENE DISSOUS; MATIERE ORGANIQUE DISSOUTE; MATIERE ORGANIQUE PARTICULEE; PHOSPHORE ORGANIQUE; CORRELATION STATISTIQUE.
Ano: 1974 URL: http://www.documentation.ird.fr/hor/fdi:07406
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Applications halieutiques du système Argos IRD
Leroy, C.; Dintheer, C.; Herbland, Alain.
Le système Argos est actuellement utilisé dans trois programmes se rapportant aux pêches maritimes. Les programmes d'aide à la prospection du germon (#Thunnus alalunga$) dans le NE de l'Atlantique et d'étude des stocks de crevettes (#Penaeus subtilis$ et #P. brasiliensis$) sur le plateau continental de la Guyane française utilisent une balise connectée à un micro-calculateur destiné à compacter les messages. La technologie de ce matériel permet de transmettre des données issues de capteurs météorologiques et de messages entrés au clavier en mode conversationnel. La structure du message est déterminée par un programme écrit en langage BASIC. A la réception, le décodage et le traitement sont effectués par un micro-ordinateur. Le troisième programme concerne...
Tipo: Text Palavras-chave: PECHE MARITIME; ESTIMATION DE STOCK; THON; CREVETTE; SATELLITE; SOLE; BALISE ARGOS; RELATION PECHE ENVIRONNEMENT.
Ano: 1986 URL: http://www.documentation.ird.fr/hor/fdi:42793
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Behaviour of arsenic on the continental shelf off the Gironde estuary: role of phytoplankton in vertical fluxes during spring bloom conditions ArchiMer
Michel, Pierre; Boutier, Bernard; Herbland, Alain; Averty, Bernard; Artigas, Lf; Auger, Dominique; Chartier, E.
The arsenic (As) cycle in the marine environment is known to be sensitive to biological activity. Within the scope of the National Coastal Oceanography Program, we undertook a specific study of the behaviour of this element in a water column on the continental shelf of the Bay of Biscay off the Gironde estuary during two oceanographic cruises conducted in May 1994 and May 1995. Various chemical forms were measured: arsenite (As3), at-senate (As5), monomethylarsenic (MMA), dimethylarsenic (DMA) and dissolved total As after ultraviolet mineralization. The net flux of total As from the Gironde estuary was evaluated as well as its effect on the concentration in surface marine waters. The vertical profiles in the coastal zone during a period of active primary...
Tipo: Text Palavras-chave: Arsenic; Phytoplankton; Speciation; Gironde plume; Biscay Bay.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/publication-851.pdf
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Biomasse, excrétion et production du zooplancton - micronecton hauturier du golfe de Guinée : relations avec le phytoplancton et les particules IRD
Le Borgne, Robert; Herbland, Alain; Le Bouteiller, Aubert; Roger, Claude.
Tipo: Text Palavras-chave: BIOMASSE; EXCRETION; ACTIVITE BIOLOGIQUE; ZOOPLANCTON; MICRONECTON; MICROZOOPLANCTON; REPARTITION VERTICALE; VARIABILITE; RELATION TROPHIQUE; MESOPLANCTON; MACROZOOPLANCTON.
Ano: 1983 URL: http://www.documentation.ird.fr/hor/fdi:15481
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Carbon fixation and productivity index in relation to chlorophyll and light in the Equatorial Atlantic Ocean IRD
Le Bouteiller, Aubert; Herbland, Alain.
Tipo: Text Palavras-chave: PRODUCTION PRIMAIRE; PRODUCTIVITE PRIMAIRE; CHLOROPHYLLE; LUMIERE; PROFIL VERTICAL.
Ano: 1984 URL: http://www.documentation.ird.fr/hor/fdi:19786
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Comparaisons des systèmes productifs de l'Atlantique tropical est : dômes thermiques, upwellings côtiers et upwelling équatorial IRD
Voituriez, B.; Herbland, Alain.
All the high-productive systems of the Eastern tropical Atlantic between 20°N and 15°S - coastal upwelling, equatorial upwelling, and thermal domes-are partly controlled by the subsuperficial equatorial countercurrent system, which feeds all of them with Southern Atlantic Central Water. However, the enrichment processes in the systems are quite different, and thus the structures differ from one another. Two types have to be considered : 1) the quasi geostrophic ones which are two-layered systems belonging to the "typical tropical situations", where the primary production is controlled by the depth of the nitraciline; 2) the systems including coastal upwelling and equatorial divergence in summer, where the warm nitrate-depleted mixed layer is absent....
Tipo: Text Palavras-chave: COURANT EQUATORIAL; CONTRECOURANT; UPWELLING; COURANT GEOSTROPHIQUE; PRODUCTION PRIMAIRE.
Ano: 1982 URL: http://www.documentation.ird.fr/hor/fdi:42794
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Conditions d'apparition de densités accrues de dinoflagellés Dinophysis dans le pertuis d'Antioche et les eaux adjacentes. Campagnes Dinopertuis 89 ArchiMer
Delmas, Daniel; Herbland, Alain; Maestrini, Serge; Mornet, Francoise; Morand, Philippe; Spano, Anna-maria; Burgeot, Thierry; Margat, Sylvie; Charpentier, Gabriel; Fillon, Alain; Leguay, Didier; Thomas, Gerard; Bacher, Cedric; Heral, Maurice; Prou, Jean.
Environmental and species features which lead to increases in cell density of the D.S.P. Dinoflagellate Dinophysis in inshore and offshore waters of the île de Ré - île d'Oléron area, France (cruises "Dinopertuis89"). Four weekly sampling series have been carried out, within 10 May – 31 May 1989, at 24 stations located from inshore to offshore waters of the "île de Ré" - "île d’Oléron" area, with the aim to investigate (i) whether Dinophysis increases in cell density occur first in offshore waters and then, eventually, are pushed to the coast, or develop simultaneously in the whole area, and (ii) whether there are some environmental conditions which are related to Dinophysis blooms. Depths of sampling have been stated on the bas is of STD profiles. All...
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Ano: 1990 URL: http://archimer.ifremer.fr/doc/00174/28532/26916.pdf
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Diel variation of chlorophyll a as evidence from a 13-day station in the equatorial Atlantic ocean IRD
Le Bouteiller, Aubert; Herbland, Alain.
Tipo: Text Palavras-chave: CHLOROPHYLLE; PHYTOPLANCTON; BIOMASSE; VARIATION TEMPORELLE; RYTHME NYCTHEMERAL; PROFIL VERTICAL.
Ano: 1982 URL: http://www.documentation.ird.fr/hor/fdi:03671
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Do Dinophysis spp. come from the "open sea" along the French Atlantic coast? IRD
Delmas, D.; Herbland, Alain; Maestrini, S.Y..
A study was conducted with the aim of showing which environmental conditions promote an increase in #Dinophysis$ cells in a land-locked embayment with shellfish installations. From may 1989 to september 1991, vertical profiles were taken of temperature, salinity, nutrients and chlorophyll-a, and counts of phytoplankton species composition were made during late spring and summer. In the strait separating this area from the open sea, residual tital currents are from offshore to nearshore. Significant thermocline ... and stable stratification of the water column were required for #Dinophysis$ to exceed 1000 cell L-1. #Dinophysis$ spp. were more abundant in the "thermocline layer", scarce below this layer and absent near the bottom. These stratified...
Tipo: Text Palavras-chave: PHYTOPLANCTON; DENSITE DE POPULATION; CROISSANCE; FACTEUR ECOLOGIQUE; RELATION ESPECE ENVIRONNEMENT.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:42789
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Does the nutrient enrichment of the equatorial upwelling influence the size structure of phytoplankton in the Atlantic Ocean? ArchiMer
Herbland, Alain; Le Bouteiller, A; Raimbault, P.
A study of the size structure of chlorophyll a (Chla) covering the major part of the equatorial Atlantic Ocean from 5 degree N to 5 degree S leads to the conclusion that seasonal nutrient enrichment in the open eastern equatorial Atlantic does not drastically affect the size distribution of the primary producers: 90% of the total Chla is everywhere contained in the < 20 mu m fraction on the average. In the coastal upwelling near Dakar, this percentage is less than 60%, for the same range of chla concentrations. In the equatorial region the percentage of < 1 mu m Chla is the same in the deep chlorophyll maximum located at the top of the nitracline during the warm season and in the subsuperficial maximum of the upwelling.
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Ano: 1987 URL: http://archimer.ifremer.fr/doc/00267/37855/35936.pdf
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Dynamique du phytoplancton et matière organique particulaire dans la zone euphotique de l'Atlantique Equatorial IRD
Herbland, Alain; Le Bouteiller, Aubert.
Tipo: Text Palavras-chave: PHYTOPLANCTON; CROISSANCE; MATIERE ORGANIQUE PARTICULEE; TEMPERATURE; NITRATE; CHLOROPHYLLE; PRODUCTION PRIMAIRE; ZONE EUPHOTIQUE.
Ano: 1983 URL: http://www.documentation.ird.fr/hor/fdi:010023168
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Environmental conditions which lead to increase in cell density of the toxic dinoflagellates Dinophysis spp. in nutrient-rich and nutrient-poor waters of the French Atlantic coast ArchiMer
Delmas, Daniel; Herbland, Alain; Maestrini, Serge.
From 22 April to 19 June 1990, 7 stations located off La Rochelle, France, from near-shore ('bassin Marennes-Oleron') to offshore waters (50 m depth contour) were visited 8 times, with the aim of determining whether the toxic dinoflagellates Dinophysis spp. increase in cell density in nutrient-poor offshore water, in nutrient-rich inshore waters, or both, and to determine their vertical distribution in relation to stratification. Temperature stratification developed offshore, but not inshore. In April, few Dinophysis spp. were present offshore and none inshore. In late May, up to 15 X 10(3) cells l(-1) were recorded in the 10 to 15 m layer offshore, whereas inshore waters contained only a few cells l(-1). In late May, a short period of wind partly modified...
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Ano: 1992 URL: http://archimer.ifremer.fr/doc/00190/30141/28772.pdf
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Etude de la production pélagique de la zone équatoriale de l'Atlantique à 4° W : 1. Relations entre la structure hydrologique et la production primaire IRD
Voituriez, Bruno; Herbland, Alain.
Tipo: Text Palavras-chave: HYDROLOGIE MARINE; PRODUCTION PRIMAIRE; PROFIL VERTICAL; REPARTITION HORIZONTALE.
Ano: 1977 URL: http://www.documentation.ird.fr/hor/fdi:19751
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Etude de la production pélagique de la zone équatoriale de l'Atlantique à 4° W : 5. Observations sur l'activité hétérotrophe IRD
Herbland, Alain; Voituriez, Bruno.
Tipo: Text Palavras-chave: ACTIVITE BIOLOGIQUE; EXCRETION; UREE; GLUCOSE; VARIATION SAISONNIERE; ACTIVITE HETEROTROPHE.
Ano: 1977 URL: http://www.documentation.ird.fr/hor/fdi:19755
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Eutrophication in a tropical pond: Understanding the bacterioplankton and phytoplankton dynamics during a vibriosis outbreak using flow cytometric analyses ArchiMer
Lucas, Ronan; Courties, C.; Herbland, Alain; Goulletquer, Philippe; Marteau, Anne-laure; Lemonnier, Hugues.
In tropical shrimp ponds, the increasing of feed input, concomitantly with the stocking shrimp biomass, induces an eutrophication of the ecosystem. Although difficult to maintain, its stability is required to guarantee the success of the culture. A 110-day period of phytoplankton and bacterioplankton stock and dynamics in an earthen pond (1.2 ha area, 1 m depth) was monitored using flow cytometry to provide baseline information on community characteristics and ecosystem instability. Seven autotrophic cell types were identified over the whole sampling period. Prokaryotic cells included Synechococcus sp., a group named UNK which presented an atypical new flow cytometric signature and picoeukaryotes (PEUK). Nanophytoplankton cells were represented by 4...
Tipo: Text Palavras-chave: Tropical shrimp aquaculture; Ecosystem shift; Phytoplankton; Bacterioplankton; Vibrio; Flow cytometry.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00029/14068/11312.pdf
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Excrétion organique du phytoplancton et activité bactérienne hétérotrophe dans le dôme de Guinée (océan Atlantique tropical est) IRD
Herbland, Alain; Dandonneau, Yves.
Tipo: Text Palavras-chave: PRODUCTION PRIMAIRE; PHYTOPLANCTON; EXCRETION; CARBONE ORGANIQUE; CORRELATION SPATIOTEMPORELLE; ASSIMILATION; MINERALISATION; ACTIVITE BIOLOGIQUE; BACTERIE; REPARTITION VERTICALE.
Ano: 1975 URL: http://www.documentation.ird.fr/hor/fdi:32198
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Foraminiferal assemblages: tools for assessment of shrimp pond conditions ArchiMer
Debenay, Jean-pierre; Della Patrona, Luc; Herbland, Alain; Goguenheim, Hemitti; Peignon, Jean-marie.
Meiofauna is a functional group made of small benthic metazoans 45 to 500µm in size. Although protista, foraminifera living in this kind of environment are often put in to the meiofauna. Meiofauna has been studied in New Caledonia for its double role as biological indicator for monitoring pond health status and as shrimp forage. Suitability of EOM (easily oxidized material), SOD(sediment oxygen demand),as new biochemical tools for monitoring shrimp pond health was assessed in an environmental survey aiming to assess the role of the water/sediment interface in the occurrence of the summer syndrome vibriosis. EOM, SOD and redox were correlated with shrimp survivals. Lowest meiofauna biomass and abundance were concomitantly found in the most polluted station....
Tipo: Text
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00198/30876/29244.pdf
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Heterotrophic activity in the mauritanian upwelling in march 1973 : assimilation and mineralization of amino acids IRD
Herbland, Alain.
Tipo: Text Palavras-chave: PRODUCTION BIOLOGIQUE; ACTIVITE BIOLOGIQUE; BACTERIE; CHLOROPHYLLE; NITRATE; OXYGENE DISSOUS; PHOSPHORE ORGANIQUE; AMMONIUM; EXCRETION; PHYTOPLANCTON; VARIATION SPATIALE; VARIATION TEMPORELLE; RYTHME NYCTHEMERAL; UPWELLING; ACTIVITE HETEROTROPHE.
Ano: 1978 URL: http://www.documentation.ird.fr/hor/fdi:09981
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Hydro-plankton characteristics and their relationship with sardine and anchovy distributions on the French shelf of the Bay of Biscay ArchiMer
Petitgas, Pierre; Masse, Jacques; Bourriau, Paul; Beillois, Pierre; Bergeron, Jean-pierre; Delmas, Daniel; Herbland, Alain; Koueta, Noussithe; Froidefond, Jean-marie; Santos, Maria.
The spatial pattern in hydro-plankton and fish distributions and their relationship were analysed based on the spring 2000 fisheries acoustic survey. The importance of this survey was that it was a multi-disciplinary platform which collected an extensive set of parameters in the hydro-plankton leading to a potentially finer description of hydro-plankton conditions and fish habitats. More than 50 variables were measured on a grid of stations, in four compartments of the ecosystem: hydrology, nutrients, primary producers and meso-zooplankton. First, a joint analysis of all hydro-plankton compartments was performed using multiple factor analysis (MFA). The method was used to estimate a compromise factorial space common to all compartments in which the...
Tipo: Text Palavras-chave: Fish environment relationship; Hydro plankton; Habitats; Multiple factor analysis; Spatial pattern.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3961.pdf
Registros recuperados: 67
Primeira ... 1234 ... Última
 

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