Consulta: subjectFacets:"Production primaire"
Registros recuperados: 30
Data/hora: 01/06/2024 11:29:05

Biomasse et production primaire du phytoplancton et du microphytobenthos de deux biotopes sableux (Golfe de Fos, France)
Provedor de dados: 5
Autores: Plante-cuny, Marie-reine; Bodoy, Alain.
The primary production (phytoplankton and microphytobenthos) of a coastaL shallow water ecosystem (0.5 m) was investigated in two sandy areas, differing by their wave exposure. The physical and chemical parameters, the functional chlorophyll and pheopigments as well as the primary production were measured monthly, throughout a two-year study. The bivalve Ruditapes decussatus was the dominant species in the sheltered station (RD), whereas Donax trlmcu/us inhabited the other station (DT) which was exposed to the open-sea waves. Microphytic biomasses were determined after extracting chlorophyll a and pheopigments in 90% acetone. by spectrophotometric measurements before and after acidification. Gross hourly primary production was estimated by measuring the...
Tipo: Text
Palavras-chave: Biomasse; Production primaire; Phytoplancton; Microphytobenthos; Mediterranee; Biomass; Primary production; Phytoplancton; Microphytobenthos; Mediterranean.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2870.pdf

Short-term variability of primary production and inorganic nitrogen uptake related to the environmental conditions in a shallow coastal area (Gulf of Trieste, N Adriatic Sea)
Provedor de dados: 5
Autores: Cantoni, C; Cozzi, S; Pecchiar, I; Cabrini, M; Mozeti, P; Catalano, G; Umani, Sf.
Primary production (PP) and, nitrate (QNO(3)) and ammonium (QNH(4)) uptakes were measured together with other environmental parameters from October 1999 to February 2001 in the Gulf of Trieste (N Adriatic Sea). Their trends showed a high variability because of the combined effects of meteorological conditions, water circulation and river discharges. PP ranged from 0.2 to 1.5.9 mumol C dm(-3) d(-1), whereas QNO(3) varied from 0.8 to 442 nmol N dm(-3) d(-1), showing a trend similar to that of carbon basically ascribable to the autotrophic activity. QNH(4) ranged from 20 to 1308 nmol N dm-3 d-' and it reached the highest values during the declining phases of phytoplankton blooms, indicating that bacterial community can also be involved in its uptake....
Tipo: Text
Palavras-chave: Production primaire; Production nouvelle; Nutriments; Temps de renouvellement; Apports de rivières; Primary production; New production; Nutrients turnover time; Riverine inputs.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43248/42979.pdf

Modèle hydro-sédimentaire du bassin de Marennes-Oléron : présentation et principaux résultats
Provedor de dados: 5
Autores: Raillard, Olivier; Le Hir, Pierre; Lazure, Pascal.
Depuis plusieurs années l'écosystème conchylicole de Marennes-Oléron est l' objet de modélisations de complexité croissante qui tendent à intégrer de plus en plus de processus physiques et biologiques (Bacher, 1989 ; Raillard, 1991) afin d'accroître le réalisme et le champ d'investigation de l'outil (Héral et al., 1991 ) . Confrontés au problème de la variabilité spatiale et temporelle des concentrations du matériel dissous et particulaire de l'eau, les travaux les plus récents ont pu mettre en évidence les limitations des modèles d'écosystème qui asservissent spatialement et temporellement la représentation des processus physiques à celle des mécanismes biologiques (Raillard, 1991). Le but de cette étude est de développer une modélisation de l'écosystème...
Tipo: Text
Palavras-chave: Modèle hydro-sédimentaire; Concentration particulaire; Concentration dissoute; Production primaire; Production secondaire; Bassin de Marennes Oléron; Charente Maritime Dep.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/00102/21305/18918.pdf

Phytoplankton production in the Tagus estuary (Portugal)
Provedor de dados: 5
Autores: Cabecadas, L.
Biomass and phytoplankton photosynthetic response were studied in the lower Tagus estuary weekly, and related to environmental conditions in February, March and April 1994. The Photosynthesis-Irradiance ((P-I)-I-B) relation was studied based on the light-saturated photosynthesis rate (P(B)m) and the light-limited initial slope (a(B)). The nutrient concentrations observed were high enough to be considered as not limiting phytoplankton growth. Tagus estuary phytoplankton seems, to a certain extent, adapted to high turbid conditions, being able to utilize the low light levels more efficiently, which was translated by high values of a(B) [0.10-0.20 mg C (mg Chl a)(-1) h(-1) (W m(-2))(-1)]; however, light seems to limit phytoplankton production in the water...
Tipo: Text
Palavras-chave: Production primaire; Phytoplancton; Estuaire; Biomasse; Turbidité; Primary production; Phytoplankton; Estuary; Biomass; Turbidity.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43621/43310.pdf

Réseau Hydrologique Littoral Normand (RHLN). Suivi 2015
Provedor de dados: 5
Autores: Menet-nedelec, Florence; Riou, Philippe; Rabiller, Emilie; Courtay, Gaelle; Fontaine, Bruno; Francoise, Sylvaine; Jacqueline, Franck; Lesaulnier, Nadine; Louis, Fabienne; Maheux, Frank; Pierre-duplessix, Olivier; Schapira, Mathilde; Simon, Benjamin; Dumas, Franck; Le Gendre, Romain.
La stratégie d’échantillonnage optimisée du Réseau Hydrologique Littoral Normand (RHLN) a été approuvée en 2007 par ses partenaires, avec le triple objectif (1) d’observer les  niveaux d’eutrophisation et les phénomènes associés pour comprendre leur déclenchement et évolution ; (2) d’évaluer la qualité des eaux selon les indicateurs réglementaires (DCE, OSPAR), et expertiser ces évaluations selon les connaissances actuelles du milieu ; et (3) d’améliorer et publier les connaissances via des projets de recherche, et permettre la validation des modèles. Ce rapport réalise la synthèse des résultats obtenus en 2015, treizième année depuis le début du suivi en Normandie. Le climat de l’année 2015 a été la troisième année la plus chaud en baie des Veys depuis 40...
Tipo: Text
Palavras-chave: Abondance; Baie de Seine; Biomasse chlorophyllienne; Bloom; DCE; Écosystème côtier; Éléments de qualité; Eutrophisation; Grille d’évaluation de l’eutrophisation; Hydrologie; Limitation potentielle; Normandie; Nutriments; Phytoplancton; Production primaire; Réseau hydrologique; RHLN; Stocks hivernaux.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00426/53754/54647.pdf

Mise en évidence par traçage isotopique naturel de ressources trophiques des moules dans la Baie de l'Aiguillon (France)
Provedor de dados: 5
Autores: Richard, Pierre; Blanchard, Gerard; Goulletquer, Philippe.
The trophic resources of cultivated mussel have! been characterized and their contribution to the food of these molluscs estimated in the Bay of Aiguillon (France) through the analysis of their natural C and N isotope composition. The contribution of terrestrial organic matter (&amp;#948;(13)C = -27 to -34 %0) to mussel food resources is around 10% along the year, except in winter (15 10 30 %). A large seasonal variation is observed in the utilization of oceanic phytoplanktoll (&amp;#948;(13)C = -19 to -21.5 %0) and of littoral benthic productions (microphytobenthos and phanerogame detritus,&amp;#948;(13)C = -12.0 to -16.7 %0). Overall, the main food source of mussels is formed by benthic productions for molluscs grown on poles, in peculiar in the South of...
Tipo: Text
Palavras-chave: Détritus; Production primaire; Isotope stable; Source trophique; Moule.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-2774.pdf

Preliminary results from POLMAR III (April 13-18, 1978) (SUROIT III) ATP, primary production and respiration rates in zooplankton. Complément à la Communication du Groupe Ecophysiologie du Centre Océanologique de Bretagne (SAMAIN et al.)
Provedor de dados: 5
Autores: Hendrikson, P.; Hirche, H.j.; Junghans,, U.
ATP, primary production and respiration rates in seston, respiration rates in zooplankton have been investigated after the spill by "AMOCO CADIZ". Gross primary production seems to be similar to the normal situation. The rate of photosynthesis is lower at the "AMOCO CADIZ" station than at any of the others. Respiration rates are surprisingly high at the surface. ATP concentra­tion exhibit an homogeneous pattern, zooplankton respiration are similar to the data obtained in Peruvian upwelled waters or in zooplankton culture. A more detailed computation of data will be necessary before concluding.
Tipo: Text
Palavras-chave: Plancton; Taux respiratoires; ATP; Production primaire; Pollution; AMOCO CADIZ; Plankton; Respiration rates; ATP; Primary production; Pollution; AMOCO CADIZ.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/00306/41729/40940.pdf

Modélisation de la production primaire et de la croissance de l'huître Crassostrea gigas en Baie de Bourgneuf
Provedor de dados: 5
Autores: Dussauze, Morgan.
Le modèle hydrodynamique/biogéochimique ECO-MARS 30 est appliqué à la Baie de Bourgneuf (mailles des 500 mètres) afin d'une part, de modéliser la production primaire et d'autre part, d'introduire le modèle de croissance de l'huître Crassostrea gigas (Bari lié et al, 1997). Le modèle n'étant muni ni d'un module de remise en suspension du sédiment, ni d'un module permettant de représenter le compartiment  microphytobenthique, une approximation (forçage d'une climatologie pour la matière en suspension, utilisation d'un terme source dans la couche de fond pour la chlorophylle) a été effectuée afin de représenter de manière schématique le gradient Nord-Sud de turbidité, les rapides changements de turbidité qui sont mesurés au niveau des bancs ostréicoles au...
Tipo: Text
Palavras-chave: Baie de Bourgneuf; Production primaire; Croissance de l'huître; Modèle mathématique.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00446/55746/57401.pdf

Détection satellitaire et modélisation opérationnelle de la production végétale non-fixée dans la bande côtière bretonne
Provedor de dados: 5
Autores: Penard, Cédric.
The negative impact of the man on the environment unquestionably increases. The coastal environment as a whole is the maritime environment which is the most exposed to man-made eutrophication. For instance, nitrate loads to coastal waters off Brittany (France) have increased 10 times (from 3 to s 30mg L-1NO3) during the four last decades. Eutrophication of this coastal zone is now a recurrent problem, more and more worrying. This eutrophication exhibits two main forms : " green tides ", which are caused by local proliferations and stranding of green macro-algae (particularly the Ulva species) in nitrogen-enriched areas ; phytoplanktonic blooms, which are responsible for coloured water events, toxic species can be present (Pseudo-Nitzschia, Alexandrium,...
Tipo: Text
Palavras-chave: Bande côtière bretonne; Modèle couplé hydrodynamique-biogéochimie; Nutriments; Chlorophyllea; Production primaire; Eutrophisation; Modèle opérationnel; Pseudo-Nitzschia; French Brittany coastal shelf; Hydrodynamical biogeochemical coupled model; Nutrients; Chlorophyll-a; Primary production; Eutrophication; Operational model; Pseudo-Nitzschia.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00015/12603/9481.pdf

Influence des ondes de Rossby sur le système biogéochimique de l'Océan Atlantique Nord: Utilisation des données satellites couleur de l'eau et d'un modèle couplé physique/biogéochimie
Provedor de dados: 5
Autores: Charria, Guillaume.
The marine phytoplankton in the ocean represents only less than 1% of global biomass. Phytoplankton performs half of all photosynthesis. This autotrophic biomass in ocean is then an essential element in the climate regulation through processes as carbon dioxide absorption during the photosynthesis. Therefore, we need to estimate precisely this biomass as well as the processes which affect it. Using remotely sensed data (altimetry and ocean colour) and a coupled physical/biogeochemical model (MERCATOR-OPA/NPZDDON), Rossby waves and their influence on phytoplankton biomass are specifically studied in the North Atlantic Ocean. Their features and their influences on surface chlorophyll concentrations were analysed. Through the different mechanisms identified,...
Tipo: Text
Palavras-chave: Coupled physical/biogeochemical modelling; Multi sensor wavelet analysis; Ocean carbon cycle; North Atlantic Ocean; Primary production; Ocean colour; Altimetry; Rossby (or planetary) waves; Planetary waves; Coupled physical/biogeochemical oceanography; Modélisaiton couplée physique/biogéochimie; Analyse en ondelettes multi capteurs; Cycle océanique du carbone; Océan Atlantique Nord; Production primaire; Couleur de l'eau; Altimétrie; Ondes de Rossby ou planétaires; Océanographie couplée physique/biogéochimie.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-2454.pdf

Variability and seasonality of physical and biological fields at the Great Meteor Tablemount (subtropical NE Atlantic)
Provedor de dados: 5
Autores: Mourino, B; Fernandez, E; Serret, P; Harbour, D; Sinha, B; Pingree, R.
Five oceanographic surveys were conducted at the Great Meteor Tablemount (subtropical NE Atlantic; 30.0 degreesN, 28.5 degreesW) throughout the 1992-1999 period tc, investigate temporal variability in the relationship between the physical structure of the water column associated with the seamount and phytoplankton biomass and/or production rates. Local increases in chlorophyll a, enhanced carbon incorporation rates and changes in phytoplankton species composition were associated with the seamount. These effects were subjected to a large degree of temporal and spatial variability both at seasonal and shorter time scales.
Tipo: Text
Palavras-chave: Variabilité physique; Phytoplancton; Production primaire; Mont sous-marin; Atlantique subtropical; Physical variability; Phytoplankton; Primary production; Seamount; Subtropical Atlantic.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43362/42853.pdf

Zonal variability of plankton and particle export flux in the equatorial Pacific upwelling between 165° E and 150° W
Provedor de dados: 5
Autores: Le Borgne, R; Rodier, M; Le Bouteiller, A; Murray, Jw.
Observations made during a "La Nina" situation (April-May 1996) in the equatorial Pacific upwelling, between 165 degrees E and 150 degrees W, show the classic deepening of hydrological isolines from east to west, resulting in zonal gradients for surface temperature and macronutrients. However, contrasting with such a gradient, no clear zonal variation could be seen for integrated planktonic biomasses and carbon fluxes, namely: chlorophyll a, bacterial abundances, particulate organic phosphorus, mesozooplankton ash free dry weight, primary production, and the sinking flux of particulate organic carbon (POC). Moreover, mean values of these parameters along the zonal equatorial transect, are not significantly different from those of a 7-day-long time series...
Tipo: Text
Palavras-chave: Pacifique équatorial; Variabilité zonale; Plancton; Sédimentation de carbone; Production primaire; Equatorial Pacific; Zonal variations; Plankton; Carbon sinking flux; Primary production.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43629/43254.pdf

Simulation de l'effet d'une variation réaliste des apports azotés et phosphorés de la Loire et de la Vilaine sur la production primaire dans la zone Loire/Vilaine
Provedor de dados: 5
Autores: Dussauze, Morgan.
Cette étude financée à 50% par l’Agence de l’Eau Loire/Bretagne avait pour but de modéliser la production primaire et l’oxygène dissous dans la zone Loire/Vilaine au moyen du modèle Ifremer ECO-MARS 3D. Après validation des résultats à l’aide de données in situ et satellitaires, elle a permis de déterminer la classification DCE des différentes masses d’eaux de la zone suivant les critères ‘biomasse phytoplanctonique’ et ‘oxygène dissous’. Elle a également donné pour la première fois une idée de l’étendue de la zone potentiellement sensible à l’hypoxie. Différents scénarios de réduction des apports azotés et phosphorés (-20%, -50% et +20%) ont été réalisés. En voici les principales conclusions : -les diatomées sont assez peu sensibles aux différentes...
Tipo: Text
Palavras-chave: Zone Loire/Vilaine; Modélisation 3D; Production primaire; Oxygène dissous; Classement DCE.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00061/17207/14713.pdf

Étude de la dynamique du microphytobenthos des vasières intertidales aux latitudes tempérées : approche combinée modélisation couplée physique-biologie et analyse de données satellitales
Provedor de dados: 5
Autores: Savelli, Raphael.
The high primary production (PP) of intertidal mudflats at temperate latitudes is mostly supported by microphytobenthos (MPB), which support both benthic and pelagic food webs. In the present thesis, we use a physical-biological coupled model to investigate the spatial and temporal variability of MPB dynamics on a large temperate intertidal mudflat of the French Atlantic coast. The model explicitly simulates the MPB biomass and the grazer (Peringia ulvae) biomass and density. The outputs provide key findings on MPB dynamics. In winter-spring, optimal light and mud surface temperature (MST) conditions for MPB growth lead to a MPB spring bloom. Light is the most limiting driver over the year. However, a high MST limits the MPB growth 40% of the time during...
Tipo: Text
Palavras-chave: Microphytobenthos; Vasière intertidale; Production primaire; Modélisation physique-biologie; Télédétection; Microphytobenthos; Intertidal mudflat; Primary production; Physical-biological modelling; Remote sensing.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00692/80423/83559.pdf

Échanges de sels nutritifs entre la zone côtière et un système estuarien intertidal : la baie de Somme (Manche, France)
Provedor de dados: 5
Autores: Loquet, N; Rybarczyk, H; Elkaim, B.
The Bay of Somme is the second ranked estuarine system, after the Seine estuary, on the French coasts of the Eastern Channel. The nutrient retention and regeneration capacities of this estuary have been calculated from continental and coastal hydrological data and from estimation of the residence time. Measurements at the mouths of the main rivers over a one-year period (from October 1994 to November 1995) were used to construct a budget of continental inputs which showed that the smaller rivers could, at times, be important contributors. The annual budget shows continental inputs of nitrogen, phosphorus, silicon and suspended particulate matter of 9 000 t . y(-1), 380 t . y(-1), 5 400 t y(-1) and 67 800 t . y(-1). Estimation of coastal inputs to the...
Tipo: Text
Palavras-chave: Manche; Baie de Somme; Flux de nutriments; Production primaire; English Channel; Bay of Somme; Nutrient fluxes; Primary production.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00325/43577/44045.pdf

Phytoplancton en baie de Seine. Influence du panache fluvial sur la production primaire
Provedor de dados: 5
Autores: Videau, Christiane; Ryckaert, Mireille; L' Helguen, Stéphane.
Phytoplankton distribution and primary productivity were investigated in the Bay of Seine (eastern English Channel, France) in spring and early summer of 1992 and 1994. In 1992, the horizontal distribution of phytoplankton species was determined over the whole Bay of Seine. In 1994, species distribution and primary productivity were studied along the salinity gradient of the Seine plume and in the neighbouring marine waters. Phytoplankton distribution was characterised by the permanent diatom dominance from early spring to early summer. The spring bloom did not occur uniformly over the bay, but was initiated in the marine waters, in the middle of the bay and progressed towards the coast where it developed, in June, in the diluted waters of the Seine plume....
Tipo: Text
Palavras-chave: Baie de Seine; Production primaire; Phytoplancton; Bay of Seine; Primary productivity; Phytoplankton.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00333/44398/44057.pdf

Modélisation des flux de matières dans la baie de Marennes-Oléron : couplage de l'hydrodynamisme, de la production primaire et de la consommation par les huîtres.
Provedor de dados: 5
Autores: Struski, Caroline.
To answer the questions of trophic capacity of the oyster bay of Marennes- Oléron, models were implemented since the 90s. The dynamics of the system is studied here by using a model 2D of hydrodynamism and transport with fine meshes (SiAM2D). The modelling and the analysis of existing data are used to answer the following questions: which factors control the primary production in the bay, in which scales of time act these factors, which link exists between pelagic and microphytobenthic productions , and which is the impact of oysters on the planctonic compartment SiAM2D serves as tool to couple models of pelagic and microphytobenthic primary production, and of filtration by oysters. The model of pelagic production is calibrated from measures of...
Tipo: Text
Palavras-chave: Oyster impact; Primary production; Scales of variability; Biophysical model; Impact des huîtres; Production primaire; Echelles de variabilité; Modèle biophysique.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-554.pdf

Modélisation du réseau trophique pélagique et de la production primaire en Manche
Provedor de dados: 5
Autores: Hoch, Thierry.
This paper deals with a model of the pelagic ecosystem in the English Channel The model takes into account nitrogen biogeochemical cycle explicitly and indirectly phosphorus, silicon and carbon ones. The pelagic ecosystem is described precisely, on the one hand with the help of three phytoplanktonic compartments, and the other by considering the microbial food web. Primary production appears to be mainly controlled by stratification and turbidity, except in the Bay of Seine where high terrestrial nutrient inputs generate a sharp enrichment. Moreover, the model allows some general ecological conclusions to be drawn. From the simulation, it appears that inorganic nitrogen in the water column is mainly produced by an intense recycling. In accordance with in...
Tipo: Text
Palavras-chave: Nitrogen fluxes; Primary production; Ecological model; English Channel; Flux d'azote; Production primaire; Modèle écologique; Manche.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-841.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

Etude de valorisation de base de données qualité des eaux dans le bassin de Marennes-Oléron et le bassin de La Charente
Provedor de dados: 5
Autores: Eaucea,; Prou, Jean.
L'objet de l'étude est de décrire les liens principaux entre l'hydrologie de la Charente et les constats qualitatifs dans le bassin de Marennes, ainsi que l'estimation des flux continentaux, sur la base des données des stations de Fontenelles et de Boyard entre 1977 et 2006. Du fait de l'influence de la marée, il n'est pas possible de mesurer les débits de la Charente dans sa partie aval. Ils ont donc été reconstitués à partir des stations de Saint-Savinien, du pont de Beillant, de Carillon, du Moulin de Chatre, de la Lijardière, de Jarnac, de Vindelle et de Foulpougne, en fonction de la disponibilité et de la fiabilité des données. Les mesures à Fontenelles et Boyard ont été réalisées de façon à disposer d'une gamme variée de situations par rapport au...
Tipo: Text
Palavras-chave: Hydrologie; Flux continentaux; Cycle de marée; Nitrates; Phosphates; Production primaire; Marennes Oléron; Charente.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00083/19419/17030.pdf

Réseau Hydrologique Littoral Normand - RHLN - Année 2013
Provedor de dados: 5
Autores: Menet-nedelec, Florence; Riou, Philippe; Etourneau, Claude; Courtay, Gaelle; Fontaine, Bruno; Francoise, Sylvaine; Jacqueline, Franck; Lesaulnier, Nadine; Maheux, Frank; Pierre-duplessix, Olivier; Rabiller, Emilie; Schapira, Mathilde; Simon, Benjamin.
La stratégie d’échantillonnage optimisée du Réseau Hydrologique Littoral Normand (RHLN) a été approuvée en 2007 par ses partenaires, avec le triple objectif (1) d’observer les niveaux d’eutrophisation et les phénomènes associés pour comprendre leur déclenchement et évolution ; (2) d’évaluer la qualité des eaux selon les indicateurs réglementaires (DCE, OSPAR), et expertiser ces évaluations selon les connaissances actuelles du milieu ; et (3) d’améliorer et publier les connaissances via des projets de recherche, et permettre la validation des modèles.  Ce rapport réalise la synthèse des résultats obtenus en 2013, douzième année depuis le début du suivi en Normandie. Le climat de l’année 2013 a été globalement proche des normales en température et...
Tipo: Text
Palavras-chave: Abondance; Baie de Seine; Biomasse chlorophyllienne; Bloom; DCE; Écosystème côtier; Éléments de qualité; Eutrophisation; Grille d’évaluation de l’eutrophisation; Hydrologie; Limitation potentielle; Normandie; Nutriments; Phytoplancton; Production primaire; Réseau hydrologique; RHLN; Stocks hivernaux.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00273/38377/36695.pdf

Réseau Hydrologique Littoral Normand - RHLN - Année 2012
Provedor de dados: 5
Autores: Baehr, Antoine; Menet-nedelec, Florence; Riou, Philippe; Etourneau, Claude; Fontaine, Bruno; Francoise, Sylvaine; Gangnery, Aline; Jacqueline, Franck; Lamort, Laure; Lesaulnier, Nadine; Maheux, Frank; Picoche, Coralie; Pierre-duplessix, Olivier; Rabiller, Emilie; Schapira, Mathilde; Simon, Benjamin.
Le Réseau Hydrologique Littoral Normand (RHLN) a été approuvé en 2007 par ses partenaires, avec le triple objectif (1) de maintenir le suivi de la qualité des masses d’eau et d’évaluer leur niveau d’eutrophisation en réponse aux réglementations (Directive Nitrate, OSPAR, DCE), (2) de poursuivre la réflexion sur la définition des indicateurs DCE, puis (3) de développer les connaissances et de fournir des données à la modélisation. Ce rapport réalise la synthèse des résultats obtenus en 2012, onzième année depuis le début du suivi en Normandie. Le climat de cette année 2012 a été caractérisé par des températures saisonnières proches des normales malgré des écarts de température parfois importants d’un mois sur l’autre (notamment en hiver). Par rapport aux...
Tipo: Text
Palavras-chave: Abondance; Baie de Seine; Biomasse chlorophyllienne; Bloom; DCE; Écosystème côtier; Éléments de qualité; Eutrophisation; Grille d’évaluation de l’eutrophisation; Hydrologie; Limitation potentielle; Normandie; Nutriments; Phytoplancton; Production primaire; Réseau hydrologique; RHLN; Stocks hivernaux.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00211/32224/30672.pdf

Étude et modélisation des populations de macrophytes dans la lagune de Thau (Hérault, France)
Provedor de dados: 5
Autores: Plus, Martin.
The works carried out can be divided in three main lines : design and management of experimental studies on primary production processes, macrophyte spatial distribution study and development of macrophyte and seagrass numerical models.  In situ and in vitro experiments have been performed with the aim of studying the processes and the parameters involved in the photosynthesis-respiration system, as well as to establish the main biotic (self-shading effect, physiology of the photosynthesis, carbon, nitrogen and chlorophyll tissu contents) and abiotic (temperature, light and nutrients) factors controlling macrobenthic primary production. A seagrass ecosystem model based on nitrogen and oxygen fluxes has been developped. Model calibration and validation have...
Tipo: Text
Palavras-chave: Primary production; Light; Nitrogen; Nutrients; Mathematical model; Thau lagoon; Seagrass; Macrophytes; Production primaire; Lumière; Azote; Nutriments; Model mathématique; Thau; Phanérogames; Macrophytes.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/these-6518.pdf

Phytoplancton en baie de Seine. Influence du panache fluvial sur la production primaire
Provedor de dados: 5
Autores: Videau, Christiane; Ryckaert, Mireille; L' Helguen, Stéphane.
Phytoplankton distribution and primary productivity were investigated in the Bay of Seine (eastern English Channel, France) in spring and early summer of 1992 and 1994. In 1992, the horizontal distribution of phytoplankton species was determined over the whole Bay of Seine. In 1994, species distribution and primary productivity were studied along the salinity gradient of the Seine plume and in the neighbouring marine waters. Phytoplankton distribution was characterised by the permanent diatom dominance from early spring to early summer. The spring bloom did not occur uniformly over the bay, but was initiated in the marine waters, in the middle of the bay and progressed towards the coast where it developed, in June, in the diluted waters of the Seine plume....
Tipo: Text
Palavras-chave: Bay of Seine; Primary productivity; Phytoplankton; Baie de Seine; Production primaire; Phytoplancton.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-843.pdf

Détermination des "bassins récepteurs" marins des principaux fleuves français de la façade Manche-Atlantique, et de leurs rôles respectifs dans l'eutrophisation phyto-planctonique des masses d'eau DCE et des sous-régions DCSMM. Phase 1 (2013) : Calcul de scénarios optimaux à partir des " bassins récepteurs". Phase 2 (2014) : Simulation de scénarios imposés et des scénarios optimaux
Provedor de dados: 5
Autores: Menesguen, Alain; Dussauze, Morgan.
- This study (granted up to 50% by the French Office for Water and Aquatic Environments ONEMA) aimed at determining by modelling (hydrodynamical/biogeochemical ECOMARS3D model) the marine "receiving basins" of the main tributaries to the French waters of the English Channel and the Bay of Biscay. Knowing the respective part of each of these marine "receiving basins" in winter nutrient distribution, some optimal scenarios of nutrient loading reduction can be computed for nitrate or phosphate in order to bring back any marine water to the Good Ecological Status regarding eutrophication, at the best efficiency/cost ratio. - The study encompasses 45 watersheds (or clusters of neighboring watersheds) which have been retained because of their sizes and flow...
Tipo: Text
Palavras-chave: Zone Manche-Atlantique; Modélisation 3D; Bassins versants; Bassins récepteurs marins; Nitrate; Phosphate; Réduction d'apports; Situation "pristine"; Production primaire; Oxygène dissous; Classement DCE; Bon Etat Ecologique; Optimisation linéaire; Simplexe; Optimisation quadratique; Méthode de Beale.; English Channel; Bay of Biscay; 3D modelling; Watersheds; Receiving basins; Nitrate; Phosphate; Nutrient loading reduction; Pristine situation; Primary production; Dissolved oxygen; WFD classification; Good Ecological Status; Linear optimisation; Simplexe method; Quadratic optimisation; Beale's method.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00333/44422/44083.pdf

Réseau Hydrologique Littoral Normand - RHLN - Année 2014
Provedor de dados: 5
Autores: Menet-nedelec, Florence; Ropert, Marion; Riou, Philippe; Courtay, Gaelle; Fontaine, Bruno; Francoise, Sylvaine; Jacqueline, Franck; Lesaulnier, Nadine; Louis, Fabienne; Maheux, Frank; Pierre-duplessix, Olivier; Rabiller, Emilie; Schapira, Mathilde; Simon, Benjamin.
La stratégie d’échantillonnage optimisée du Réseau Hydrologique Littoral Normand (RHLN) a été approuvée en 2007 par ses partenaires, avec le triple objectif (1) d’observer les  niveaux d’eutrophisation et les phénomènes associés pour comprendre leur déclenchement et évolution ; (2) d’évaluer la qualité des eaux selon les indicateurs réglementaires (DCE, OSPAR), et expertiser ces évaluations selon les connaissances actuelles du milieu ; et (3) d’améliorer et publier les connaissances via des projets de recherche, et permettre la validation des modèles. Ce rapport réalise la synthèse des résultats obtenus en 2014, douzième année depuis le début du suivi en Normandie. Le climat de l’année 2014 a été globalement une année chaude, avec un record de la moyenne...
Tipo: Text
Palavras-chave: Abondance; Baie de Seine; Biomasse chlorophyllienne; Bloom; DCE; Écosystème côtier; Éléments de qualité; Eutrophisation; Grille d’évaluation de l’eutrophisation; Hydrologie; Limitation potentielle; Normandie; Nutriments; Phytoplancton; Production primaire; Réseau hydrologique; RHLN; Stocks hivernaux.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00403/51493/52092.pdf

Ecotron Embiez - I. Présentation du programme. Conditions de production de phytoplancton et son utilisation par des bivalves filtreurs dans les salines de l'île des Embiez (Var-France)
Provedor de dados: 5
Autores: Vicente, N.
After some testing of Bivalves planting in a tank fitted up inside the saltemes of the Embiez island (Var-France) in 1975, a planctonstat has been rea­lized on the ground inside a beton tank where the evolution of phytoplancton has been studied.
Tipo: Text
Palavras-chave: Production primaire; Bivalves; Salines; Primary production; Bivalves; Salines.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41665/40874.pdf

Evolution à moyen terme d'un écosystème estuarien : le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Soletchnik, Patrick.
The Marennes Oléron Bay, the main French oyster culture basin, is an estuarine zone which is subject to anthropic pressure. Meteorological parameters such as temperature, insolation, pluviometry determine, for the most part, the water temperature and salinity conditions for each season and control the nutrient fluxes, as well as the primary and secondary production of the basin. The average air temperature (Météo -France) stays around 12.5°C between 1950 and 1980, then rises more than 1°C in 20 years. In those 50 years, average insolation drops from 198 hours to 176 hours, corresponding to an 11% decrease. Seasonal distribution of water inputs shows that spring pluviometry increased by 30% between the 1950's and the last two decades. Precipitations also...
Tipo: Text
Palavras-chave: Ressource trophique; Crassostrea gigas; Production primaire; Bassin Marennes Oléron; Ecosystème.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/acte-3381.pdf

Alimentation et croissance de bivalves filtreurs en bassin aménagé
Provedor de dados: 5
Autores: Riva, A.; Lelong, P.
The lagoon of Brusc located on the Mediterranean coast (Var­France) is subjected to climatic and hydrologic particular condi­tions. The low values observed for nutrient into the sea water affect the evolution of phytoplankton. Thus chlorophyll concen­tration measured in the lagoon give an annual average of 0.42 mg. m-3 . The growth of two bivalves species : Cerastoderma glaucum and Venerupis semidecussata was compared between two stations where one population of each species are implanted. The culture of this molluscs is made in the lagoon and in outdoor pound dug on the old salt-pan near at hand. In the pound, subjected to natural climatic conditions, a great growth is noted for this two species. The growth rate appear better than the populations of the...
Tipo: Text
Palavras-chave: Lagune méditerranéenne; Production primaire; Bivalves; Croissance; Mediterranean Lagoon; Primary production; Bivalves; Growth.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00306/41674/40883.pdf

Variabilité hydrologique et biologique du golfe du Lion. II. Productivité sur le bord interne du courant
Provedor de dados: 5
Autores: Conan, P; Pujo-pay, M; Raimbault, P; Leveau, M.
An estimation of the annual productivity in the Gulf of Lions has been made in the 0-100 m layer using a Let-Go system, with monthly measurements at a fixed station. A value of 140 to 150 g m(-2) a(-1) of C is found, of which around 75 % occurs in the upper 50 m. The seasonal production is described according to three distinct patterns during the two hydrological seasons: (1) variable production in winter; (2) surface bloom in late winter; (3) homogeneous and mean production in summer with a clear Deep Chlorophyll Maximum. The hydrological winter phase represented 60 % of total annual production. The seasonal duality of the hydrodynamic system and the mesoscale variations of the Northern Mediterranean Current account for the variability and the evolution...
Tipo: Text
Palavras-chave: Production primaire; Bilan; Nitrate; Chlorophylle; Cycle saisonnier; Primary production; Budget; Nitrate; Chlorophyll; Seasonal cycle.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43639/43248.pdf