Consulta: creatorFacets:"Souchu, Philippe"
Registros recuperados: 51
Data/hora: 11/06/2024 03:37:56

Rapport d'activités 2018 du Laboratoire Environnement Ressources Conchylicoles du Morbihan-Pays de Loire
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cochennec-laureau, Nathalie; Bellec, Gwenael; Bizzozero, Lucie; Bonneau, Francoise; Bouget, Jean-francois; Bouvier, Calypso; Collin, Karine; Fortune, Mireille; Gabellec, Raoul; Le Merrer, Yoann; Manach, Soazig; Mellor, Alice; Pierre-duplessix, Olivier; Reboul, Sebastien; Retho, Michael; Roux, Pauline; Schapira, Mathilde; Schmitt, Anne; Souchu, Philippe; Stanisiere, Jean-yves.
Activités d’observation, de surveillance de la qualité des eaux littorales du Morbihan, Pays de Loire et Nord Vendée et résultats des projets de recherche 2018
Tipo: Text
Palavras-chave: Réseaux de surveillance et d’observation; Qualité des écosystèmes marins littoraux du Morbihan; Pays de Loire; Microbiologie; Phytoplancton; Eutrophisation; Ressources exploitées; Huîtres; Moules.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00481/59245/61969.pdf

Bilan des observations hydrologiques du secteur côtier au large de la Loire et de la Vilaine en 2018
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collin, Karine; Bizzozero, Lucie; Le Merrer, Yoann; Retho, Michael; Pierre-duplessix, Olivier; Souchu, Philippe; Cochennec-laureau, Nathalie.
Ce rapport décrit le contexte hydrologique du littoral côtier du Morbihan, Pays de Loire et Nord Vendée, durant l’année 2018. Il s’appuie sur les suivis environnementaux réalisés dans le cadre des réseaux REPHY et de la DCE, complétés des données acquises en haute fréquence sur la bouée MOLIT et sur le secteur du Bois de la Chaise.
Tipo: Text
Palavras-chave: Hydrologie; DCE; Nutriment; Loire Bretagne; Rephy; Phytoplancton.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00634/74571/74443.pdf

Eutrophication: A new wine in an old bottle?
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Le Moal, Morgane; Gascuel-odoux, Chantal; Menesguen, Alain; Souchon, Yves; Etrillard, Claire; Levain, Alix; Moatar, Florentina; Pannard, Alexandrine; Souchu, Philippe; Lefebvre, Alain; Pinay, Gilles.
Eutrophication is one of the most common causes of water quality impairment of inland and marine waters. Its best-known manifestations are toxic cyanobacteria blooms in lakes and waterways and proliferations of green macro algae in coastal areas. The term eutrophication is used by both the scientific community and public policy-makers, and therefore has a myriad of definitions. The introduction by the public authorities of regulations to limit eutrophication is a source of tension and debate on the activities identified as contributing or having contributed decisively to these phenomena. Debates on the identification of the driving factors and risk levels of eutrophication, seeking to guide public policies, have led the ministries in charge of the...
Tipo: Text
Palavras-chave: Eutrophication; Nitrogen; Phosphorus; Algae bloom; Land-sea continuum; Diffuse pollution.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00456/56734/58551.pdf

Modelling nitrogen, primary production and oxygen in a Mediterranean lagoon. Impact of oysters farming and inputs from the watershed
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Chapelle, Annie; Menesguen, Alain; Deslous-paoli, Jean-marc; Souchu, Philippe; Mazouni, Nabila; Vaquer, André; Millet, Bertrand.
An ecosystem model based on nitrogen cycling and oxygen has been developed for the Thau lagoon. It takes into account the specific features of this Mediterranean lagoon, a semi-confined system with watershed inputs and oyster farming. The ecosystem model uses currents calculated by a two-dimensional hydrodynamic model and integrated into a box model. This model is compared with a year survey data and used to estimate nitrogen and oxygen fluxes between the different ecosystem compartments. The yearly simulation shows that the ecosystem behavior is driven by meteorological forcing, especially rain which causes watershed inputs. These inputs trigger microphytoplankton growth, which is responsible for new primary production. During dry periods, nitrogen is...
Tipo: Text
Palavras-chave: Oxygen; Nitrogen; Oysters; Primary production; Box model; Lagoon ecosystem.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-725.pdf

Caractérisation de l'état d'eutrophisation des trois principaux étangs corses (Biguglia, Diana et Urbino), et proposition de renforcement de leur surveillance. Rapport final
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Orsoni, Valerie; Souchu, Philippe; Sauzade, Didier.
L'étude porte sur les trois principaux étangs corses (Biguglia, Diana et Urbino), situés à la bordure de la plaine orientale. Ecosystèmes fragiles et productifs, ces étangs supportent des enjeux importants, en tant qu'habitats naturels remarquables et du fait de leur exploitation intensive par la pêche, l'aquaculture et la conchyliculture. Cette étude vise à évaluer leur état d'eutrophisation, en utilisant une méthode de diagnostic spécifique aux milieux lagunaires méditerranéens, développée par l'Ifremer pour l'Agence de l'eau Rhône Méditerranée Corse, et portant sur l'utilisation d'indicateurs caractérisant la colonne d'eau, dont le phytoplancton, le sédiment et les macrophytes. Dans l'eau, les prélèvements ont été réalisés sur une période de 12 mois en...
Tipo: Text
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00074/18534/16078.pdf

Qualité du Milieu Marin Littoral 2017. Bulletin de la surveillance 2017. Laboratoire Environnement Ressources du Morbihan/Pays de Loire. Départements de la Loire-Atlantique et de Vendée nord
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cochennec-laureau, Nathalie; Bizzozero, Lucie; Bonneau, Francoise; Collin, Karine; Fortune, Mireille; Le Merrer, Yoann; Pierre-duplessix, Olivier; Schapira, Mathilde; Schmitt, Anne; Souchu, Philippe.
Suivi hydrologique L’année 2017 s’est caractérisée par des températures élevées et un déficit en précipitation sur le bassin versant de la Loire, ce qui la classe parmi les années sèches exceptionnelles avec les années 2003, 2011 et 2015. Les débits de la Loire ont été largement déficitaires. L’ensoleillement soutenu en début d’année et en automne a été toutefois plus faible sur les mois de juillet et septembre. Suivi microbiologique Parmi les 41 stations de surveillance, 9 ont présenté une bonne qualité microbiologique, 31 une qualité moyenne, et une seule station est de mauvaise qualité. Comparativement à l'année 2016, le nombre de stations présentant une tendance à l'amélioration est en augmentation : 4 stations présentent une tendance à l'amélioration...
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00461/57312/59406.pdf

Spatiotemporal dynamics of submerged macrophyte status and watershed exploitation in a Mediterranean coastal lagoon: Understanding critical factors in ecosystem degradation and restoration
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pasqualini, Vanina; Derolez, Valerie; Garrido, Marie; Orsoni, Valerie; Baldi, Yoann; Etourneau, Sabrina; Leoni, Vanina; Rebillout, Patrick; Laugier, Thierry; Souchu, Philippe; Malet, Nathalie.
Increases in the intensity of disturbances in coastal lagoons can lead to shifts in vegetation from aquatic angiosperms to macroalgal or phytoplankton communities. Such abrupt and discontinuous responses are facilitated by instability in the equilibrium controlling the trajectory of the community response. We hypothesized that the shift in macrophyte populations is reversible, and that this reversibility is dependent on changes in the pressures exerted on the watershed and lagoon functioning. Biguglia lagoon (Mediterranean Sea, Corsica) is an interesting case study for the evaluation of long-term coastal lagoon ecosystem functioning and the trajectory of submerged macrophyte responses to disturbances, to facilitate the appropriate restoration of...
Tipo: Text
Palavras-chave: Coastal lagoons; Human pressures; Long-term changes; Submerged macrophytes; Community shifts.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00372/48341/48564.pdf

Rapport d'activités 2019 du Laboratoire Environnement Ressources du Morbihan Pays de Loire
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cochennec-laureau, Nathalie; Bizzozero, Lucie; Bonneau, Francoise; Bouget, Jean-francois; Bouvier, Calypso; Collin, Karine; Fortune, Mireille; Gabellec, Raoul; Le Merrer, Yoann; Manach, Soazig; Pierre-duplessix, Olivier; Retho, Michael; Roux, Pauline; Schapira, Mathilde; Schmitt, Anne; Souchu, Philippe; Stanisiere, Jean-yves; Villedieu, Anouk.
Activités d’observation, de surveillance de la qualité des eaux littorales du Morbihan, Pays de la Loire et Nord Vendée et résultats des projets de recherche 2019
Tipo: Text
Palavras-chave: Réseaux de surveillance et d’observation; Qualité des écosystèmes marins littoraux du Morbihan; Pays de la Loire; Microbiologie; Phytoplancton; Eutrophisation; Ressources exploitées; Huîtres; Moules.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00630/74217/73849.pdf

Contribution of several nitrogen sources to growth of Alexandrium catenella during blooms in Thau lagoon, southern France
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collos, Y; Vaquer, A; Laabir, M; Abadie, Eric; Laugier, Thierry; Pastoureaud, Annie; Souchu, Philippe.
A monitoring program with a weekly sampling frequency over a 15-month period indicates that urea concentrations above a certain threshold level may trigger the blooms of Alexandrium catenella in Thau lagoon. However, urea concentrations were also sometimes related to ammonium and dissolved organic nitrogen concentrations, indicating that the role of urea may not be a direct one. An original approach is used to assess the relative contribution of several nitrogen sources (nitrate, nitrite, ammonium, urea) to growth of A. catenella by comparing nitrogen uptake rates to nitrogen-based growth rates estimated from dilution experiments during four blooms over a 4-year period (2001-2004) in Thau lagoon. Nitrate and nitrite contributed 0.1-14% and 0.1-5%...
Tipo: Text
Palavras-chave: Uptake kinetics; Ammonium; Urea; Growth; Nitrogen; HAB; Alexandrium catenella.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-6454.pdf

Pheopigment dynamics, zooplankton grazing rates and the autumnal ammonium peak in a Mediterranean lagoon
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collos, Yves; Husseini Ratrema, Julie; Bec, Béatrice; Vaquer, André; Hoai, Thong Lam; Rougier, Claude; Pons, Virginie; Souchu, Philippe.
The dilution technique was used to estimate chlorophyll and pheopigment, net and gross production as well as zooplankton grazing over a 12-month period in a coastal lagoon in Southern France. Chlorophyll a (Cha) based gross growth rates of phytoplankton ranged from undetectable in February to 2.6 day(-1) in June, corresponding to 3.8 divisions per day. Cha-based grazing rates ranged from undetectable in February to 1.1 d(-1) in June. The seasonal growth pattern of picoplankton was similar to that of the whole community, with a peak in July, corresponding to four divisions per day. Grazing processes represented from 20 to 150% of the phytoplankton daily growth, and the grazing pressure was stronger on small phytoplankton cells than on larger cells. Gross...
Tipo: Text
Palavras-chave: Zooplankton; Ammonium; Pheopigments; Degradation; Growth; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-727.pdf

Variabilité spatio-temporelle des nutriments et du carbone et flux associés le long d’un continuum terrestre-aquatique tempéré (Marais poitevin – Baie de l’Aiguillon – Pertuis Breton)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Coignot, Elise; Polsenaere, Pierre; Soletchnik, Patrick; Le Moine, Olivier; Souchu, Philippe; Joyeux, Emmanuel; Le Roy, Yoann; Guéret, Jean-pierre; Froud, Louise; Gallais, Régis; Chourré, Elise; Chaigneau, Loïc.
  Les zones côtières en raison de leur statut d’interface entre les continents, les océans et l’atmosphère constituent un environnement particulièrement actif et impliqué dans les cycles biogéochimiques. Elles sont le réceptacle de molécules particulaires et dissoutes véhiculées par les rivières et impliquées à la fois dans la chaine trophique et dans les phénomènes d’eutrophisation ou de toxicité. Cette étude a pour objectif d’étudier la dynamique des nutriments et du carbone au niveau d’un continuum terrestre-aquatique formé par le Marais poitevin (MP), la Baie de l’Aiguillon (BA) et le Pertuis Breton (PB). L’étude a été réalisée sur deux années (2017 et 2018) contrastées en terme de pluviométrie. Au total, huit sites (deux estuaires, trois chenaux et...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/73003/72077.pdf

L'eutrophisation des eaux marines et saumâtres en Europe, en particulier en France
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Menesguen, Alain; Aminot, Alain; Belin, Catherine; Chapelle, Annie; Guillaud, Jean-francois; Joanny, Michel; Lefebvre, Alain; Merceron, Michel; Piriou, Jean-yves; Souchu, Philippe.
In order to be able to count the cases of coastal eutrophication and to propose methods to monitor as well as to reduce these phenomena, first of all it is necessary to precisely define the word eutrophication itself. Instead of the strict etymological definition, that is to say a progression of the enrichment of a medium, we will rather retain the concept of a state enriched at a point such as it causes harmful effects on the ecosystem, and nuisances to man's activities. Based on the average chemical equations of the organic matter synthesis/degradation in the sea, this operational definition thus puts forwards the harmful consequences of enrichment, i.e. the production of an excessive algal biomass, sometimes unbalanced from the point of view of...
Tipo: Text
Palavras-chave: Alexandrium; Phaeocystis; Monostroma; Ulva; Dilution plume; Water trapping; Anoxia; Nitrogen and phosphorus loadings; Red tides; Phytoplankton blooms; Green tides; Eutrophication; Alexandrium; Phaeocystis; Monostroma; Ulva; Panache de dilution; Confinement; Anoxie; Phosphate; Nitrate; Apports terrigènes; Eaux colorées; Blooms phytoplanctoniques; Marées vertes; Eutrophisation.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/rapport-22.pdf

Influence of shellfish farming activities on the biogeochemical composition of the water column in Thau lagoon
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Vaquer A, André; Collos, Yves; Landrein, Sonia; Deslous-paoli, Jean-marc; Bibent, Bertrand.
Thau lagoon is a Mediterranean shellfish ecosystem with large biomasses of oysters growing in waters with high residence time due to low tidal ranges, The influence of filter feeders (oysters and their epibiota) on the spatial distribution of particulate and dissolved compounds in the water column of Thau lagoon was studied through its variation with time, In 1991/1992, daily variations were investigated in pens, corridors and outside shellfish farming zones for nutrients, chlorophyll a and primary production. Salinity, dissolved oxygen, nutrients, organic matter and chlorophyll a were also monitored in surface waters inside and outside shellfish farming zones each week from January 1993 to March 1994. The presence of shellfish farms led to a decrease by...
Tipo: Text
Palavras-chave: Thau lagoon; Carrying capacity; Nutrient cycling; Phytoplankton; Suspension feeding bivalves.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-808.pdf

La crise anoxique du bassin de Thau de l'été 1997. Bilan du phénomène et perspectives
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Abadie, Eric; Vercelli, Catherine; Buestel, Dominique; Sauvagnargues, Jean-claude.
La crise anoxique ou «malaïgue» qui a sévi dans le bassin de Thau durant l'été 1997 a détruit presque le tiers de la production annuelle d'huîtres. Son déclenchement a suivi une période durant laquelle les vents étaient exceptionnellement faibles. Après un rappel scientifique des processus mis en jeu, la crise anoxique est décrite au travers des observations de mortalités et des concentrations en oxygène dissous. Les eaux anoxiques se sont développées dans les zones conchylicoles vers l'Est et l'Ouest à partir d'un foyer situé à proximité du principal port conchylicole (Mourre-Blanc à Mèze). La comparaison de la crise de 1997 avec celles qui l'ont précédée fait apparaître un recul de l'eutrophisation depuis 25 ans. En revanche, des secteurs très localisés...
Tipo: Text
Palavras-chave: Lagunes; Thau; Conchyliculture; Anoxies; Eutrophisation; Crassostrea gigas.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00039/15010/12336.pdf

Biogeochemical aspects of bottom anoxia in a Mediterranean lagoon (Thau, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Gasc, Anne; Collos, Y; Vaquer, A; Tournier, Henri; Bibent, B; Deslous-paoli, Jean-marc.
Physical and chemical characteristics (temperature, salinity, dissolved oxygen), nutrients [dissolved inorganic nitrogen (DIN), soluble reactive phosphorus (SRP) and silicate], dissolved organic nitrogen (DON) and phosphorus and particulate matter [particulate organic carbon (POC) and nitrogen (PON) and chlorophyll a] were measured at a station located in the deepest part of the Thau lagoon (8.5 m), France, during a 10 d period of bottom anoxia in summer 1994. The upper 8 cm of sediment were also analyzed for ammonium (NH(4)(+)) and SRP concentrations in the porewater. The study period was characterized by mean wind speed under 4 m s(-1) which induced an increase of surface temperature from 18 to 29 degrees C with the formation of a thermocline. The...
Tipo: Text
Palavras-chave: Anoxia; Nitrogen; Phosphorus; Eutrophication; Thau lagoon; Mediterranean Sea.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00070/18142/15694.pdf

Avis concernant les risques d’envasement et de surdensité en coquillages dans la zone 44,03, traict de Pen Bé
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Cochennec-laureau, Nathalie; Bizzozero, Lucie; Larnaud, Pascal.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00620/73221/79239.pdf

Bilan des observations hydrologiques du secteur côtier au large de la Loire et de la Vilaine en 2017
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collin, Karine; Bizzozero, Lucie; Le Merrer, Yoann; Retho, Michael; Souchu, Philippe; Cochennec-laureau, Nathalie; Schapira, Mathilde; Manach, Soazig.
Ce rapport décrit le contexte hydrologique du littoral côtier du Morbihan, Pays de Loire et Nord Vendée, sous l’influence de la Loire et de la Vilaine, durant l’année 2017. Il s’appuie sur les suivis environnementaux réalisés dans le cadre des réseaux REPHY et de la DCE, complétés des données acquises en haute fréquence sur la bouée MOLIT (réseau COAST-HF).
Tipo: Text
Palavras-chave: Hydrologie; DCE; Nutriment; Loire Bretagne; Rephy; Phytoplancton.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00472/58410/60972.pdf

Influence of nitrogen enrichment on size-fractionated in vitro carboxylase activities of phytoplankton from Thau Lagoon (Coastal Mediterranean Lagoon, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Fouilland, Eric; Descolas Gros, Chantal; Collos, Yves; Vaquer A, André; Souchu, Philippe; Gasc, Anne; Bibent, Bertrand; Pons, Virginie.
The influence of dissolved inorganic and organic nitrogen (DIN and DON) enrichments on pools of enzymes responsible for CO2 fixation by the Calvin-Benson (Rubisco) and beta-carboxylation pathways (beta-carboxylases) were studied in a natural plankton assemblage. The plankton community from a coastal Mediterranean lagoon were incubated in situ for 24 h with initially ammonium, nitrate and DON (taurine) enrichments and compared to a control without any enrichment. An increase of small picophytoplankton and diatom biomass was observed in the enriched inorganic nitrogen treatments 7 - 10 h after the initial enrichment. Phytoplankton biomass decreased in the control and under taurine enrichment suggesting an inorganic nitrogen limitation of phytoplankton growth.
Tipo: Text
Palavras-chave: Heterotrophy; Autotrophy; Nitrogen enrichments; Size fractionated phytoplankton; Carboxylase activities.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-451.pdf

Ecologie conchylicole : de l'exploitation à l'environnement
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Deslous Paoli, Jean-marc; Souchu, Philippe.
Tipo: Text
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00083/19472/17087.pdf

Dinophag. Programme de recherche sur Dinophysis dans les eaux littorales des Pays de la Loire
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Oger-jeanneret, Helene; Lassus, Patrick; Sechet, Veronique; Le Magueresse, Alain; Le Bihan, Veronique.
Ce document résume les conclusions du programme de recherche Dinophag réalisé par l’Ifremer avec l’aide de la Région Pays de la Loire de janvier 2011 à décembre 2012. Il est destiné à tous ceux qui se sont interrogés sur la place que tient la microalgue toxique Dinophysis dans l’économie littorale de notre Région. Les lecteurs y découvriront aussi que Dinophysis n’est pas vraiment une microalgue comme les autres et qu’il reste encore pour les chercheurs de nombreuses interrogations sur le déterminisme de son développement et de sa toxicité.
Tipo: Text
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00172/28368/26660.pdf

Diagnostic étendu de l'eutrophisation (DIETE). Rôle des sédiments dans le cycle des nutriments et impacts sur l'eutrophisation de la baie de Vilaine (2014-2017)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Cochennec-laureau, Nathalie; Ratmaya, Widya; Retho, Michael; Andrieux, Francoise; Le Merrer, Yoann; Barille, Laurent; Barille, Anne-laure; Goubert, Evelyne; Plus, Martin; Laverman, Anniet.
Le projet DIETE a exploré les données hydrobiologiques (paramètres physico-chimiques, nutriments, phytoplancton) acquises depuis les années 80 dans les eaux côtières au large de la Loire et de la Vilaine, parallèlement à celles des deux fleuves. L’augmentation des concentrations de nitrates dans les eaux de la Loire, appuyée par les réserves sédimentaires de phosphates et de silicate ont entraîné de profonds bouleversements dans la dynamique du phytoplancton de la baie de Vilaine ces deux dernières décennies avec 1) une augmentation substantielle de la biomasse, 2) une modification importante de l’évolution saisonnière, 3) un changement dans les proportions entre diatomées et dinoflagellés au profit des diatomées. Ces résultats ouvrent tout un champ...
Tipo: Text
Palavras-chave: Eutophisation; Azote; Phosphore; Silicium; Sédiments; Modélisation.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00425/53695/54593.pdf

Demande de données sur la salinité moyenne de l’eau de mer à Port Giraud – La Plaine sur mer
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Fortune, Mireille; Cochennec-laureau, Nathalie.
Demande des données de salinité moyenne de l’eau de mer suite à un problème de corrosion sur les menuiseries et garde-corps extérieurs d'une habitation.
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00334/44525/81877.pdf

National observation infrastructures in a European framework: COAST-HF A fixed-platform network along French coasts
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Charria, Guillaume; Schmitt, François; Artigas, Felipe; Berthebaud, Eric; Bonnat, Armel; Bourrin, François; Bozec, Yann; Cariou, Thierry; Claquin, Pascal; Conan, Pascal; Coppola, Laurent; Delalée, Franck; Facq, Jean-valery; Farcy, Patrick; Ferreira, Sophie; Garcia, Fabrice; Grisoni, Jean-michel; Jacqueline, Franck; Jacquet, Matthias; Lefebvre, Alain; Leredde, Yann; Le Roux, Jean-francois; Mas, Sébastien; Mostajir, Behzad; Mousseau, Laure; Pairaud, Ivane; Petton, Sebastien; Pouvreau, Stephane; Quemener, Loic; Ravel, Christophe; Raimbault, Patrick; Repecaud, Michel; Retho, Michael; Rimmelin-maury, Peggy; Riou, Philippe; Savoye, Nicolas; Souchu, Philippe; Verney, Romaric; Vuillemin, Renaud.
COAST-HF (Coastal OceAn observing SysTem – High Frequency) is a French national observation network of the physical and biogeochemical dynamics of the coastal ocean, at high frequency. COAST-HF aims at understanding and analysing changes of contrasted coastal ecosystems at different temporal scales from extreme or intermittent high frequency (hour, day) events to multi-year trends. Since several years (from 2000 for the longest time series in Bay of Brest), the network extends along the English Channel, Atlantic and Mediterranean French coasts through 14 fixed platforms instrumented for the in situ high-frequency (≤ 1h) observations. Several French research institutes (IFREMER, CNRS, Marine Universities) are operating these systems. The organization of...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00635/74723/74708.pdf

L’eutrophisation : manifestations, causes, conséquences et prédictibilité. Synthèse de l’Expertise scientifique collective CNRS - Ifremer - INRA - Irstea
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pinay, Gilles; Gascuel, Chantal; Menesguen, Alain; Souchon, Yves; Le Moal, Morgane; Levain, Alix; Moatar, Florentina; Pannard, Alexandrine; Souchu, Philippe.
L'eutrophisation génère des perturbations majeures pour les écosystèmes aquatiques et a des impacts sur les biens et les services associés, sur la santé humaine et sur les activités économiques. Ses manifestations les plus connues sont les efflorescences de cyanobactéries toxiques dans les lacs et cours d'eau et les proliférations de macroalgues vertes dans les zones côtières. Ces proliférations représentent de fortes biomasses dont la décomposition par des bactéries induit un appauvrissement ou un épuisement en oxygène du milieu, voire l'émission de gaz toxiques. Les débats sur l'identification des facteurs et des niveaux de risque d'eutrophisation ont conduit à la réalisation d'une expertise scientifique collective. Elle vise à fournir aux pouvoirs...
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00408/51903/52526.pdf

Avis sur la prolongation de la période de dragage du port du Crouesty
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Retho, Michael; Souchu, Philippe; Cochennec-laureau, Nathalie.
Avis d’Ifremer sur la prolongation du dragage du port du Crouesty jusqu’au 10 juin 2016 inclus. Cette demande concerne particulièrement le risque éventuel de blooms phytoplanctoniques d’Alexandrium sp.
Tipo: Text
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00334/44539/79366.pdf

Relations milieu-ressources : impact de la conchyliculture sur un environnement lagunaire méditerranéen (Thau)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Deslous-paoli, Jean-marc; Souchu, Philippe; Mazouni, N; Juge, Claude; Dagault, Francoise.
Shellfish farming leaves its mark on the environment in which it has developed, and the men who depend upon it. These changes have altogether balanced the lagoon cycle and have caused disastrous episodic events. Increased water c1arity caused by the uptake of particulate material by shellfish farming allows seagrass to grow in deeper areas of the lagoon (down to five metres). Shellfish farming nutrient transformations increase ecosystem productivity, even if the filtration pressure keeps phytoplankton biomass at a low leveI. Storage of phosphorus and nitrogen in animal tissue limits eutrophication in this ecosystem. Transfer of oysters from growout facilities increases animal and vegetal specific diversity. The presence of large amounts of shellfish allows...
Tipo: Text
Palavras-chave: Lagune; Conchyliculture; Biogéochimie; Benthos; Eutrophie; Lagoon; Shellfish farming; Biogeochemistry; Benthos; Eutrophication.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00039/15032/12365.pdf

Rapport d'activités 2017 du Laboratoire Environnement Ressources du Morbihan Pays de Loire
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cochennec-laureau, Nathalie; Bizzozero, Lucie; Blouin, Antoine; Bonneau, Francoise; Bouget, Jean-francois; Collin, Karine; Fortune, Mireille; Gabellec, Raoul; Le Merrer, Yoann; Manach, Soazig; Mellor, Alice; Pierre-duplessix, Olivier; Reboul, Sebastien; Retho, Michael; Schapira, Mathilde; Schmitt, Anne; Souchu, Philippe; Stanisiere, Jean-yves; Treguier, Cathy.
Ce rapport présente les activités d'observation et de surveillance de la qualité des eaux littorales du Morbihan, de la Loire Atlantique et du Nord Vendée et les résultats des projets de recherche.
Tipo: Text
Palavras-chave: Réseaux de surveillance et d’observation; Qualité des écosystèmes marins littoraux du Morbihan; Pays de Loire; Microbiologie; Phytoplancton; Eutrophisation; Ressources exploitées; Huîtres; Moules.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00439/55061/56484.pdf

Bilan des observations hydrologiques du secteur côtier au large de la Loire et de la Vilaine en 2016
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Retho, Michael; Bizzozero, Lucie; Le Merrer, Yoann; Manach, Soazig; Collin, Karine; Fortune, Mireille; Schmitt, Anne; Gabellec, Raoul; Souchu, Philippe; Cochennec-laureau, Nathalie.
Ce rapport décrit le contexte hydrologique du littoral côtier du Morbihan, de la Loire Atlantique et de la Vendée Nord, sous l'influence des deux fleuves la Loire et la Vilaine, durant l'année 2016. Il s'appuie sur les suivis environnementaux réalisés dans le cadre des réseaux REPHY et DCE, complétés par les données acquises en haute fréquence sur la bouée MOLIT (réseau COAST HF-HOSEA).
Tipo: Text
Palavras-chave: Hydrologie; DCE; Nutriment; Loire Bretagne; REPHY; Phytoplancton.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00416/52720/53593.pdf

Suivi des paramètres trophiques dans l'eau des étangs de la Narbonnaise. Rapport final
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Laugier, Thierry; Dusserre, Karine; Marobin, Delphine.
Le complexe lagunaire de la Narbonnaise est l'un des plus important du Languedoc-Roussillon tant par sa superficie (7000 ha) que pour sa valeur écologique, patrimoniale, économique et paysagère. Dans l'objectif d'identifier les principaux secteurs lagunaires eutrophisés,un travail de suivi mensuel des teneurs en sels nutritifs (ammonium, nitrates, nitrites et phosphates) et en chlrophylle-a dans les eaux des lagunes de la Narbonnaise (Bages-Sigean, Ayrolle, Campignol, Gruissan), de La Palme, et des canaux de la Robine et de Saint-Louis a été effectué de 1996 à 1999. Les résultats mettent en évidence des situations très différentes suivant les hydrosystèmes considérés. Notamment, les secteurs les plus eutrophisés du complexe sont ceux situés sous...
Tipo: Text
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00074/18494/16037.pdf

Note sur les eaux colorées observées au large de la Loire et de la Vilaine en avril 2017
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Retho, Michael; Schapira, Mathilde; Fortune, Mireille; Manach, Soazig; Schmitt, Anne; Cochennec-laureau, Nathalie.
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00385/49642/81466.pdf

Recovery trajectories following the reduction of urban nutrient inputs along the eutrophication gradient in French Mediterranean lagoons
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Derolez, Valerie; Bec, Beatrice; Munaron, Dominique; Fiandrino, Annie; Pete, Romain; Simier, Monique; Souchu, Philippe; Laugier, Thierry; Aliaume, Catherine; Malet, Nathalie.
Tipo: Text
Palavras-chave: Recovery; Oligotrophication; Coastal lagoons; Urban inputs; Nutrients.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00478/58953/61574.pdf

Réseau de Suivi Lagunaire du Languedoc-Roussillon. Bilan des résultats 2002
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Laugier, Thierry; Fiandrino, Annie; Souchu, Philippe; Benau, Laurent.
The numerous coastallagoons lining the Languedoc-Roussillon mediterranean coast undergone high anthropic pressure. The Lagoon Monitoring Network as a result of partnership between Ifremer, the Languedoc- Roussillon Regional Council and the Rhône Méditerranée Corse Water Agency, apply to provide yearly a diagnostic of the environmental quality of21lagoons. This network has two main goals: • The monitoring of the state of the lagoon with regards to eutrophication and sorne specifie survey in coordination with local managers. • Management support (model simulation, synthetic infonnation, scientific support) towards local managers. This annual report gathers results of the actions planned in 2002 within the Network : • For each lagoon excosystem, results of...
Tipo: Text
Palavras-chave: Lagunes littorales; Méditerranée; Eutrophisation; Diagnostic; Surveillance; Gestion; Coastal lagoon; Mediterranean; Eutrophication; Diagnostic; Monitoring; Management.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00419/53085/54046.pdf

Avis concernant le renouvellement de l’autorisation de rejet de la station d’épuration de Damgan
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bizzozero, Lucie; Souchu, Philippe; Piquet, Jean-come; Gabellec, Raoul; Retho, Michael; Cochennec-laureau, Nathalie.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00619/73061/79234.pdf

Oxygen fluxes involving the benthic micro- and macrophytic components in the Thau Lagoon under pre-anoxic conditions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Plante Cuny, Marie-reine; Plante, Raphaël; Mazouni, Nabila; Fontaine, Marie-france; Souchu, Philippe; Deslous-paoli, Jean-marc; Grenz, Christian.
Measurements of oxygen fluxes at the water-sediment interface (transparent and opaque enclosures) were made on bare sediments inhabited by microphytes on the one hand, and on sediments diversely colonized by macrophytes (macroalgae and seagrasses) on the other hand. Five stations, typical of different biotopes of a Mediterranean shallow lagoon were studied from May to July 1993 in order to observe an anoxic event which usually occurs at that time of the year. Average diurnal respiration of benthic communities ranged from 40 mg (or 1.25 mmol) O-2 m(-2) h(-1) in bare sediments (31 % of the lagoon area) to 76 mg (or 2.37 mmol) O-2 m(-2) h(-1) in sediments with a medium coverage of macroalgae (37 % of the total area) and, finally, to 100 mg (or 3.12 mmol) O-2...
Tipo: Text
Palavras-chave: Thau France; Mediterranean coastal lagoon; Micro macrophytobenthos; Oxygen fluxes; Thau (France); Lagune côtière méditerranéenne; Micro macrophytobenthos; Flux d'oxygène.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-839.pdf

Demande d’avis sur le projet d’arrêté préfectoral portant sur le schéma des structures des exploitations de cultures marines du département 56 – version 13 du 06/06/2019
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Cochennec-laureau, Nathalie; Bizzozero, Lucie; Souchu, Philippe.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00502/61407/79456.pdf

Dynamique hivernale des nutriments et du carbone dans les cours d’eau contrastés du Marais poitevin et flux terrestres associés en Baie de l’Aiguillon
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Polsenaere, Pierre; Le Marchand, Marie; Le Moine, Olivier; Soletchnik, Patrick; Chabirand, Jean-michel; Geairon, Philippe; Thomas, Gerard; Bechemin, Christian; Souchu, Philippe; Joyeux, Emmanuel; Le Roy, Yoann; Corre, Frédéric.
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00405/51629/52184.pdf

Patterns in nutrient limitation and chlorophyll a along an anthropogenic eutrophication gradient in French Mediterranean coastal lagoons
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Souchu, Philippe; Bec, Beatrice; Smith, Val H.; Laugier, Thierry; Fiandrino, Annie; Benau, Laurent; Orsoni, Valerie; Collos, Yves; Vaquer, Andre.
A cross-ecosystem comparison of data obtained from 20 French Mediterranean lagoons with contrasting eutrophication status provided the basis for investigating the variables that best predict chlorophyll a (Chl a) concentrations and nutrient limitation of phytoplankton biomass along a strong nutrient enrichment gradient. Summer concentrations of dissolved inorganic nitrogen (DIN) and phosphorus (DIP) comprised only a small fraction of total nitrogen (TN) and total phosphorus (TP). On the basis of inorganic nutrient concentrations, the most oligotrophic lagoons appeared to be phosphorus-limited, with a tendency towards the development of nitrogen limitation as eutrophication increased, as evidenced by decreasing DIN:DIP ratios. A weak but significantly...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00003/11444/8002.pdf

Oligotrophication and emergence of picocyanobacteria and a toxic dinoflagellate in Thau lagoon, southern France
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collos, Yves; Bec, Beatrice; Jauzein, Cecile; Abadie, Eric; Laugier, Thierry; Lautier, Jacques; Pastoureaud, Annie; Souchu, Philippe; Vaquer, Andre.
Time series data have been examined in Thau lagoon (Southern France) from 1972 to 2006 for water temperature, salinity, nutrients and from 1987 to 2006 for phytoplankton. A first main trend identified is an increase in mean annual water temperature (1.5 degrees C over 33 years or 0.045 degrees C/year) that was not evenly distributed among seasons. The highest rate of increase was in the spring (+ 3.0 degrees C over 33 years), followed by summer (+ 2.0 degrees C and fall (+ 1.7 degrees C. In winter, no significant increase over the 33 year period could be found. A second clear trend is a large decrease in soluble reactive phosphorus (SRP) concentration over the same 33 year period (summer values decreased from 10 mu M to 1 mu M. while winter values...
Tipo: Text
Palavras-chave: Skeletonema costatum; Alexandrium catenella; Picocyanobacteria; Oligotrophication; Long term variability; Thau lagoon.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6420.pdf

Le Continuum Homme-Terre-Mer
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Garnier, Josette; Castelle, Bruno; Labille, Jérôme; Souchu, Philippe; Thieu, Vincent; Delacourt, Christophe.
L’interface entre l’atmosphère et les surfaces continentales est un lieu d’échanges importants d’énergie et de matière liquide, solide ou gazeuse. Aussi, comprendre et quantifier les interactions entre surfaces et atmosphère est un enjeu de premier ordre pour essayer d’anticiper au mieux les conséquences de nouvelles et futures évolutions des surfaces continentales, que ce soit sous l’effet de l’évolution du climat ou de modifications de l’usage des sols. Des processus spécifiques se produisent à l’interface surface-atmosphère, rendant nécessaire l’étude de cette interface non comme un simple lieu de transfert, mais en tant qu’objet propre. S’attacher à identifier et quantifier les processus opérant dans le continuum sol-eau-plante-atmosphère doit...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00603/71464/69919.pdf

Avis concernant le renouvellement de l'autorisation de la STEP de Plouhinec
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bizzozero, Lucie; Souchu, Philippe; Piquet, Jean-come; Cochennec-laureau, Nathalie.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00603/71520/79236.pdf

Assessment of eutrophication of French Mediterranean lagoons in relation to meteorological interannual variability
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Malet, Nathalie; Derolez, Valerie; Laugier, Thierry; Munaron, Dominique; Fiandrino, Annie; Messiaen, Gregory; Fortune, Martine; Souchu, Philippe; Barral, Marc; Daloz, Aurélien; Moragues, Laurent.
Since recent decades, nutrient-related eutrophication, originating from agricultural use of fertilizer and population enhancement, can be considered worldwide as the main disturbance for coastal lagoons. Since coastal lagoons are very shallow and enclosed, their functioning is tightly linked to meteorological conditions. The aim of this study is to compare different rainfall levels and eutrophication response on coastal lagoons of the Languedoc-Roussillon (Western Mediterranean coast), subject to different nutrient loads from their watershed, in order to check the possibility to distinguish the effects of watershed management or rainfall conditions on water quality (waste water treatment plant improvement, decrease of fertilizer spreading).
Tipo: Text
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00008/11945/8651.pdf

Expertise sur la composition de l'eau de mer au large de Pornic
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collin, Karine; Souchu, Philippe; Cochennec-laureau, Nathalie.
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00458/57006/81031.pdf

Avis concernant la nouvelle version du dossier de demande d’autorisation environnementale relatif à l’aménagement du port départemental de La Turballe suite à la demande de complément formulée par la préfecture de Loire-Atlantique
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bizzozero, Lucie; Souchu, Philippe; Cochennec-laureau, Nathalie.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00614/72594/80317.pdf

Avis concernant les opérations de dragage du port de Sarzeau
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bizzozero, Lucie; Souchu, Philippe; Cochennec-laureau, Nathalie; Larnaud, Pascal.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00612/72441/80728.pdf

Distribution of picophytoplankton and nanophytoplankton along an anthropogenic eutrophication gradient in French Mediterranean coastal lagoons
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bec, Beatrice; Collos, Yves; Souchu, Philippe; Vaquer, Andre; Lautier, Jacques; Fiandrino, Annie; Benau, Laurent; Orsoni, Valerie; Laugier, Thierry.
We explored the role of natural and anthropogenic environmental perturbations in shaping the community structure and dynamics of pico- and nanophytoplankton in coastal waters. The distribution patterns of phycoerythrin-rich picocyanobacteria (PE-CYAN) and phycocyanin-rich picocyanobacteria (PC-CYAN), autotrophic picoeukaryotes (PEUK) and nanophytoplankton (NANO) were examined over a period of 3 yr in 24 Mediterranean coastal lagoons displaying wide trophic gradients (from 0.2 to 630 mu g chlorophyll a [chl a] l(-1)) and salinity gradients (from fresh to marine waters). In summer, picoplanktonic abundances reached 3 x 10(8) cells l(-1), 5 x 10(9) cells l(-1) and 6 x 10(10) cells l(-1) for PE-CYAN, PC-CYAN and PEUK, respectively. PE-CYAN and PC-CYAN showed...
Tipo: Text
Palavras-chave: Autotrophic picoeukaryotes; Picocyanobacteria; Nanophytoplankton; Abundance; Biomass; Eutrophication; Mediterranean lagoons.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00031/14267/11547.pdf

Phytoplankton seasonal dynamics in a Mediterranean coastal lagoon: emphasis on the picoeukaryote community
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bec, Béatrice; Husseini Ratrema, Julie; Collos, Yves; Souchu, Philippe; Vaquer, André.
The dynamics of the phytoplankton community were investigated in a marine coastal lagoon (Thau, NW Mediterranean) from February 1999 to January 2000. Dilution experiments, chlorophyll a (Chl a) size-fractionation and primary production measurements were conducted monthly. Maximum growth and microzooplankton grazing rates were estimated from Chl a biomass fractions to separate pico- from nano- and microphytoplankton and by flow cytometry to distinguish between picoeukaryotes and picocyanobacteria. In spring, the phytoplankton community was dominated by Chaetoceros sp. and Skeletonema costatum, which represented most of biomass (B) and primary production (P). Nano- and microphytoplankton growth was controlled by nutrient availability and exceeded losses due...
Tipo: Text
Palavras-chave: Coastal lagoon; NW Mediterranean; Picoeukaryote; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-726.pdf

Influence of shellfish farming activities on nitrification, nitrate reduction to ammonium and denitrification at the water-sediment interface of the Thau lagoon, France
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gilbert, F; Souchu, Philippe; Bianchi, M; Bonin, P.
The seasonal patterns of nitrification, denitrification and dissimilatory ammonium production (DAP) rates were studied in the sediment of 2 stations in the Thau lagoon (south of France). The station ZA was located within the shellfish farming zone and the station B was the reference site. A marked effect of shellfish fanning on bacterial activities was observed. Spatial differences were associated with discrepancies in the organic content and the reduction state of sediments, i.e. highest reductive processes (denitrification and DAP) were noted in shellfish farming area, whereas the oxidative process (nitrification) was predominant outside the farming zone. At both stations, the DAP activity increased in September (autumn) concomitant with an increase of...
Tipo: Text
Palavras-chave: Shellfish farming; Nitrogen bacterial processes; Nitrification; Nitrate reduction to ammonium; Denitrification; Thau lagoon; Mediterranean Sea; Sediment-water exchanges.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00070/18145/15697.pdf

Reduced phosphorus loads from the Loire and Vilaine Rivers were accompanied by increasing eutrophication in Vilaine Bay (South Brittany, France)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ratmaya, Widya; Soudant, Dominique; Salmon-monviola, Jordy; Plus, Martin; Cochennec-laureau, Nathalie; Goubert, Evelyne; Andrieux, Francoise; Barillé, Laurent; Souchu, Philippe.
The evolution of eutrophication (i.e., phytoplankton biomass) during recent decades was examined in the coastal waters of Vilaine Bay (VB, France) in relation to those in their main external nutrient sources, the Loire and Vilaine Rivers. Dynamic Linear Models, corroborated by the Mann-Kendall test, were used to study long-term trends and seasonality of dissolved inorganic nutrient and chlorophyll a concentrations (Chl a) in rivers and coastal waters between 1980 and 2013. The reduction in dissolved riverine inorganic phosphorus concentrations (DIP) from the early 1990s led to the decrease in their Chl a levels. However, dissolved inorganic nitrogen concentrations (DIN) decreased only slightly in the Vilaine and actually increased in the Loire, especially...
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00461/57244/59248.pdf

Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Collos, Yves; Jauzein, Cecile; Ratmaya, Widya; Souchu, Philippe; Abadie, Eric; Vaquer, André.
Diatom blooms in Thau lagoon are always related to rain events leading to inputs of inorganic nutrients such as phosphate, ammonium and nitrate through the watershed with time lags of about 1 week. In contrast, blooms of Alexandrium catenella/tamarense can occur following periods of 3 weeks without precipitation and no significant input of conventional nutrients such as nitrate and phosphate. Field results also indicate a significant drop (from 22–25 to 15–16 μM over 3 days) in dissolved organic nitrogen (DON) at the bloom peak, as well as a significant inverse relationship between A. catenella/tamarense cell density and DON concentrations that is not apparent for diatom blooms. Such dinoflagellate blooms are also associated with elevated (6–9 μM) ammonium...
Tipo: Text
Palavras-chave: Alexandrium catenella/tamarense; Non classical blooms; Organic nitrogen; Ammonium; Growth rate.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00194/30488/29758.pdf

Avis de l’Ifremer sur la demande de dérogation des opérations de dragage et de clapage des sédiments de la rade de Lorient
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bizzozero, Lucie; Retho, Michael; Souchu, Philippe; Manach, Soazig; Cochennec-laureau, Nathalie.
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00628/74015/79249.pdf

Demande d'avis sur le dossier de déclaration pour la création d'une station d'épuration sur la commune de Locoal Mendon
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bizzozero, Lucie; Piquet, Jean-come; Souchu, Philippe; Cochennec-laureau, Nathalie.
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00474/58535/81313.pdf