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| Registros recuperados: 41 | |
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| Auby, Isabelle; Trut, Gilles; Plus, Martin; Vignon, Alan; Bujan, Stephane. |
| La Directive Cadre sur l’Eau 2000/60/CE établit un nouveau cadre pour une politique communautaire dans le domaine de l’eau. Elle fixe comme objectif général d’atteindre, à l’horizon 2015, un bon état écologique et chimique des masses d’eau souterraines et de surface, ces dernières incluant les eaux côtières (MEC) et les eaux de transition (MET). Pour évaluer l’état écologique d’une Masse d'Eau (ME), la DCE utilise la notion d’écart par rapport à une situation de référence. Les valeurs de référence, que l’on peut considérer comme niveau étalon du "très bon état écologique", ont été établies par type de ME et par élément de qualité biologique (phytoplancton, macrophytes (macroalgues et phanérogames marines)), faune macro-invertébrée et poissons... |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00032/14360/11650.pdf |
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| 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... |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00461/57244/59248.pdf |
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| Chapelle, Annie; Le Bec, Claude; Amzil, Zouher; Dreanno, Catherine; Guillou, Laure; Klouch, Khadidja; Labry, Claire; Le Gac, Mickael; Pineau-guillou, Lucia; Siano, Raffaele; Abernot, Chantal; Andrieux, Francoise; Caradec, Florian; Destombe, Christophe; Dia, A.; Doner, Anne; Duval, Julia; Gouriou, Jeremie; Lazure, Pascal; Le Brun, Luc; Le Gal, Dominique; Malestroit, Pascale; Petton, Sebastien; Plus, Martin; Quere, Julien; Savar, Veronique; Schmitt, Sophie; Terre, A.; Youenou, Agnes. |
| Suite à l’événement de grande ampleur d’efflorescence d’Alexandrium minutum et des toxicités associées en Rade de Brest en 2012, un projet a été élaboré avec la Région Bretagne dans le cadre du développement du port de Brest. L’Ifremer a organisé un échantillonnage dans l’estuaire de la rivière de Daoulas, zone la plus touchée en 2012, au cours des printemps-été 2013 et 2014. Un suivi de la présence d’A. minutum dans les sédiments a également été réalisé en hiver 2014. De ces suivis, des mesures réalisées au laboratoire à ce jour, des simulations du modèle Prévimer ainsi que des résultats du réseau Rephy et Velyger, il ressort que: * La rade de Brest peut aujourd’hui être considérée comme une zone à risque pour Alexandrium minutum. En effet, depuis 2012... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00254/36487/35029.pdf |
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| Chapelle, Annie; Bacher, Cedric; Duarte, P; Fiandrino, Annie; Galbiati, L; Marinov, D; Martinez, J; Norro, A; Pereira, A; Plus, Martin; Rodriguez, S; Tsirtsis, G; Zaldivar, Jm. |
| Tipo: Text |
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| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00348/45930/45622.pdf |
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| Dalloyau, Sebastien; Trut, Gilles; Plus, Martin; Auby, Isabelle; Emery, Eric. |
| Le suivi surfacique des herbiers de zostères du Bassin d'Arcachon (a été entrepris en 2007 (pour Zostera noltii) et 2008 (pour Zostera marina). Pour Zostera noltii, cette cartographie a été réalisée par photo-interprétation d’une mosaïque d’images de résolution 1 mètre. Ces clichés IGN, orthorectifiés et georéferencés ont été acquis en août et septembre 2007. Un important travail de validation terrain a permis d'attribuer des indices de fiabilité aux cartographies obtenues. Pour Zostera marina, la méthode a consisté à coupler une information de présence/absence déterminée par superposition de signaux issus d’un sonar latéral et d’un sondeur acoustique à des observations terrain obtenues par une caméra vidéo tractée sous marine reliée à un système de... |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00167/27833/26039.pdf |
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| Auby, Isabelle; D'Amico, Florence; Barbier, Claire; Maurer, Daniele; Gouriou, Laure; Plus, Martin; Rigouin, Loic; Rumebe, Myriam; Tournaire, Marie-pierre; Trut, Gilles; Oger-jeanneret, Helene; Derrien, Annick; Genauzeau, Sylvie; Schmitt, Anne; Charpentier, Gabriel; Seugnet, Jean-luc; Grizon, James; Geairon, Philippe; Guilpain, Patrice; Thomas, Gerard; Guesdon, Stephane; Chabirand, Jean-michel; Soudant, Dominique; Lamoureux, Alice; Llevot, Gerard; Beaugrand, Philippe; Michel, Valérie; Petrau, Christian; Bariou, Jean; Landier, Pascal; Miguel, Valérie. |
| Ce rapport rend compte des résultats acquis entre 2007 et 2012 sur les paramètres hydrologiques et le phytoplancton, dans le cadre des réseaux REPHY et ARCHYD (pour les points du Bassin d’Arcachon), et celui du contrôle de surveillance des masses d'eau du district Adour-Garonne qui ne faisaient pas l’objet de suivi avant la mise en œuvre de la DCE. Ce document contient des résultats concernant les éléments de qualité physico-chimique (oxygène dissous et nutriments pour les deux types de masses d’eau, température et transparence pour les masses d’eau côtières exclusivement) selon des méthodes présentées dans quatre documents (Daniel, 2009 a et b ; Daniel et Soudant, 2010, 2011), qui sont rapportées dans une annexe de ce rapport. Sont également inclues dans... |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00152/26281/24364.pdf |
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| Plus, Martin; Auby, Isabelle; Maurer, Daniele; Trut, Gilles; Del Amo, Y.; Dumas, Franck; Thouvenin, Benedicte. |
| This study presents an assessment of the contributions of various primary producers to the global annual production and N/P cycles of a coastal system, namely the Arcachon Bay, by means of a numerical model. This 3D model fully couples hydrodynamic with ecological processes and simulates nitrogen, silicon and phosphorus cycles as well as phytoplankton, macroalgae and seagrasses. Total annual production rates for the different components were calculated for different years (2005, 2007 and 2009) during a time period of drastic reduction in seagrass beds since 2005. The total demand of nitrogen and phosphorus was also calculated and discussed with regards to the riverine inputs. Moreover, this study presents the first estimation of particulate organic carbon... |
| Tipo: Text |
Palavras-chave: Primary production; Macrophyte; Phytoplankton; Biogeochemical cycle; Physical-ecological coupled model; Arcachon bay. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00278/38963/37503.pdf |
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| De Montaudouin, X.; Lucia, M.; Binias, C.; Lassudrie, Malwenn; Baudrimont, M.; Legeay, A.; Raymond, N.; Jude-lemeilleur, F.; Lambert, C.; Le Goic, N.; Garabetian, F.; Gonzalez, P.; Hegaret, Helene; Lassus, Patrick; Mehdioub, W.; Bourasseau, L.; Daffe, G.; Paul-pont, I.; Plus, Martin; Do, V. T.; Meisterhans, G.; Mesmer-dudons, N.; Caill-milly, Nathalie; Sanchez, Florence; Soudant, P.. |
| Asari (= Manila) clam, Ruditapes philippinarum, is the second bivalve mollusc in terms of production in the world and, in many coastal areas, can beget important socio-economic issues. In Europe, this species was introduced after 1973. In Arcachon Bay, after a decade of aquaculture attempt, Asari clam rapidly constituted neo-naturalized population which is now fished. However, recent studies emphasized the decline of population and individual performances. In the framework of a national project (REPAMEP), some elements of fitness, stressors and responses in Arcachon bay were measured and compared to international data (41 publications, 9 countries). The condition index (CI=flesh weight/shell weight) was the lowest among all compared sites. Variation in... |
| Tipo: Text |
Palavras-chave: Ruditapes philippinarum; Condition index; Perkinsus; Brown Muscle Disease; Element contamination; Immune system; Arcachon Bay. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00280/39123/37676.pdf |
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| Plus, Martin; Auby, Isabelle; Verlaque, Marc; Levavasseur, Guy. |
| The main photosynthesis and respiration parameters (dark respiration rate, light saturated production rate, saturation irradiance, photosynthetic efficiency) were measured on a total of 23 macrophytes of the Than lagoon (2 Phanerogams, 5 Chlorophyceae, 10 Rhodophyceae and 6 Phaeophyceae). Those measurements were performed in vitro under controlled conditions, close to the natural ones, and at several seasons. Concomitantly, measurements of pigment concentrations, carbon, phosphorous and nitrogen contents in tissues were performed. Seasonal intra-specific variability of photosynthetic parameters was found very high, enlightening an important acclimatation capacity. The highest photosynthetic capacities were found for Chlorophyceae (e.g. Monostroma obscurum... |
| Tipo: Text |
Palavras-chave: Thau lagoon; Phaeophyceae; Rhodophyceae; Chlorophyceae; Seagrasses; Seasonal variations; Oxygen method; Macrophytes; Light response curve; Photosynthesis. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-465.pdf |
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| Ribaudo, Cristina; Plus, Martin; Ganthy, Florian; Auby, Isabelle. |
| The worldwide decline of seagrass meadows may result in the loss of relevant ecosystem services such as the carbon sequestration within marine ecosystems. In this paper, net primary production (NPP) of Zostera noltei meadows was assessed in the Arcachon Bay (SW France) with the aim of understanding the impact of meadows decline on C sequestration capacity at a basin scale. Net growth rates obtained by means of a year-long leaf-marking experiment (2005-2006) were coupled to interannual biomass measurements (1983-2010) to obtain a direct estimate of NPP. Concurrently, an indirect estimate was obtained through a mathematical model which embedded natural factors variation (temperature, light and nutrients). Z. noltei seasonal growth and leaf morphometry... |
| Tipo: Text |
Palavras-chave: Seagrass; Meadow regression; Macrotidal lagoon; Growth model; Nutrient leaf resorption. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00309/42061/41357.pdf |
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| Auby, Isabelle; D'Amico, Florence; Neaud-masson, Nadine; Rumebe, Myriam; Barbier, Claire; Duval, Magali; Tournaire, Marie-pierre; Trut, Gilles; Plus, Martin; Maurer, Daniele; Ryckaert, Mireille; Derrien, Annick; Margat, Sylvie; Schmitt, Anne; Charpentier, Gabriel; Seugnet, Jean-luc; Grizon, James; Geairon, Philippe; Guilpain, Patrice; Thomas, Gerard; Guesdon, Stephane; Llevot, Gerard; Beaugrand, Philippe; Carrere, Christian; Michel, Valerie; Petrau, Christian; Bariou, Jean; Landier, Pascal; Debinski, Olivier; Le Mao, André; Miguel, Valérie. |
| Ce rapport rend compte des résultats acquis entre 2006 et 2011 sur les paramètres hydrologiques et le phytoplancton, dans le cadre des réseaux REPHY et ARCHYD (pour les points du Bassin d’Arcachon), et celui du contrôle de surveillance des masses d'eau du district Adour-Garonne qui ne faisaient pas l’objet de suivi avant la mise en œuvre de la DCE. Ce document contient des résultats concernant les éléments de qualité physico-chimique (oxygène dissous pour les deux types de masses d’eau, température et transparence pour les masses d’eau côtières exclusivement) selon des méthodes présentées dans trois documents (Daniel, 2009 a et b ; Daniel et Soudant, 2011), qui sont rapportées dans une annexe de ce rapport. Sont également inclues dans ce document les... |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00111/22193/19862.pdf |
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| De Casamajor, Marie-noelle; Duval, Magali; Plus, Martin; Lissardy, Muriel. |
| Under the WFD monitoring the “subtidal macroalgae” parameter is calculated for the second time on the Basque coast water body from the protocol used in Britain and adapted to local environmental context. In 2011, three stations were sampled instead of 5 in 2008. The result is the same to the one obtained in 2008 with a quality index "medium" for the whole of the water body. The main criterion penalizing the calculation of the index is "opportunistic species" for each station. There is variability between sites according to the criteria between the two campaigns reflecting the interest of monitoring every three years on the three sites. |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00083/19412/17023.pdf |
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| Auby, Isabelle; Levavasseur, Guy; Plus, Martin; Deslous Paoli, Jean-marc; Grillas, Patrick. |
| Zostera noltii colonise en Méditerranée des baies abritées et des lagunes présentant des conditions abiotiques (e.g. atténuation lumineuse et salinité) très variées. Les zostères constituent des herbiers étendus et stables à Thau (Gerbal et Verlaque, 1995) qui est une lagune profonde et bien connectée à la mer (salinité peu variable). Dans le Vaccarès, moins bien connecté à la mer, cette espèce a présenté un développement important entre 1984 et 1996, alors que la salinité (moyenne annuelle) variait entre 30,1 et 4,8 (Grillas et Auby, 1996). L'objectif de ce travail était de préciser dans quelle mesure les conditions suboptimales (Tableau 1) auxquelles sont soumises les zostères du Vaccarès affecte leur production. Les capacités photosynthétiques... |
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| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00152/26287/24370.pdf |
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| Plus, Martin; Maurer, Daniele; Stanisiere, Jean-yves; Dumas, Franck. |
| Introduction and objectives of the study: Understanding the operation modes of the coastline systems requires the study of the hydrodynamics responsible for transporting the whole of the chemical and biological elements of which they are composed. The idea of maintaining a close connexion between the physics, biology, geology and chemistry of the oceans is not new, and was for that matter the subject of a note in the first report of the International Council for the Study of the Oceans (ICSS) in 1902 (Sverdrup et al., 1954): " it was seen from the beginning that the study of the physical conditions, of the chemical nature of the ocean waters, of the currents, etc., was of the greatest importance for the investigation of the problems connected with life,... |
| Tipo: Text |
Palavras-chave: France; Atlantic north east; Arcachon basin; Modelling; Measuring; Current; Hydrodynamic. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/rapport-2352.pdf |
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| Plus, Martin; Dumas, Franck; Stanisiere, Jean-yves; Maurer, Daniele. |
| A numerical model (MARS-2D) was developed, with the aim of describing the hydrodynamics that prevail in Arcachon Bay. Direct model results as well as derived mixing and transport time-scales (tidal prism, local and integrated flushing times, age of water masses), were used to understand the behaviour of water masses and exchanges between the Bay and its frontiers. Particular attention was paid to the processes that drive the hydrodynamics (tides, wind and rivers), in order to understand their respective influence. The Arcachon Bay hydrodynamic system appears primarily to be highly influenced by tides; secondarily, by winds. About two third of the lagoon total volume is flushed in and out at each tidal cycle, which represent a mean tidal prism of 384... |
| Tipo: Text |
Palavras-chave: Arcachon Bay; Tracer; Age of seawater; Flushing time; Tidal prism; Residual fluxes; Hydrodynamics. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6424.pdf |
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| Auby, Isabelle; Bost, Charles-andré; Budzinski, Helene; Dalloyau, Sebastien; Desternes, Amandine; Belles, Angel; Trut, Gilles; Plus, Martin; Pere, Caroline; Couzi, Laurent; Feigne, Claude; Steinmetz, Julien. |
| While they had previously presented a hight stability, unlike in many coastal sites worldwide, eelgrass beds (Zostera noltii and Zostera marina) of Arcachon Bay have declined sharply since the 2000s. Various causes have been invoked to explain this phenomenon: climate anomalies, disease, over-grazing by herbivorous birds, contamination by herbicides, mechanical destruction during clam fishing. A multidisciplinary study was set up to study the possible effect of these factors, by putting into perspective the history of the seagrass beds and the temporal evolution of these parameters. After a chapter dealing with recent trends (2007-2010) of seagrasses in the Bay of Arcachon, the results relative to the various hypotheses are presented. These results allow... |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00054/16507/14018.pdf |
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| Dubois, S.; Savoye, N.; Gremare, Antoine; Plus, Martin; Charlier, K.; Beltoise, A.; Blanchet, Hugues. |
| The origin and composition of sediment organic matter (SOM) were investigated together with its spatial distribution in the Arcachon Bay - a macrotidal lagoon that shelters the largest Zostera noltii meadow in Europe - using elemental and isotopic ratios. Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to SOM were estimated using a mixing model. The SOM composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, SOM was composed of 25% of decayed phanerogams, 19% of microphytobenthos, 20% of phytoplankton, 19% of river SPOM and 17% of... |
| Tipo: Text |
Palavras-chave: Sediment organic matter; Primary producers; C and N stable isotopes; Zostera noltii; Arcachon Bay. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00073/18426/16059.pdf |
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| Registros recuperados: 41 | |
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