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Registros recuperados: 38
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Restoration trends of the Thau lagoon’s water ecological status and phytoplankton communities in response to changes in anthropogenic nutrient inputs ArchiMer
Derolez, Valerie; Soudant, Dominique; Richard, Marion; Lagarde, Franck; Chiantella, Claude; Malet, Nathalie.
Thau lagoon (south of France) is one of the largest Mediterranean coastal lagoons (Fig. 1). It supports many ecosystem services such as shellfish farming, whose production reaches 10 000 tons a year. Since the 1960s, the increase of anthropogenic inputs, linked to the exponential growth of human population (Fig. 2), have resulted in contaminations of shellfish farming and the eutrophication of Thau lagoon, with significant ecological and socio-economic impacts (Mongruel et al. 2013). Since the 1970s and the late 2000s, the considerable efforts made to water depuration systems on the watershed have induced a significant decrease of nutrient inputs (Fig. 2), and have gradually led to a good environmental status of the lagoon according to the Water Framework...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00406/51794/52394.pdf
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Fonctionnement hydrodynamique de la lagune de Biguglia. Partie 1 : Mise en place de la modélisation numérique 3D ArchiMer
Dufresne, Christiane; Malet, Nathalie; Coudray, Sylvain; Fiandrino, Annie.
Le projet Interreg Retralags vise une gestion durable du patrimoine des lagunes, des lacs et des étangs et est développée afin de protéger et de valoriser le patrimoine écosystémique. Cette gestion intégrée s’appuie notamment sur des modèles de gestion des zones humides, qui permettent d’une part d’améliorer notre compréhension de leur fonctionnement et d’autre part, de tester des hypothèses par la simulation de scénarii. Les deux actions IFREMER sont : - La mise en place du modèle hydrodynamique de la lagune de Biguglia, développement d’indicateur hydrologiques opérationnels et test de scenarii hydrologiques et climatiques - La mise en place du modèle écosystémique sur la lagune de Biguglia, développement d’indicateur écologiques opérationnels et test de...
Tipo: Text Palavras-chave: Modèle hydrodynamique; MARS3D; Lagune; Biguglia.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00433/54453/55824.pdf
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Estimation des échanges entre la mer et la lagune de Biguglia : Utilisation de la méthode d’estimation des volumes d’eau échangés entre la mer et les lagunes par différence de hauteurs d’eau. ArchiMer
Tunin-ley, Alina; Malet, Nathalie; Fiandrino, Annie; Orsoni, Valerie; Baldi, Yoann.
Le projet a pour objectif premier de disposer d'un modèle hydrodynamique opérationnel (modèle MARS) sur la lagune de Biguglia et de le valider sur la base de paramètres mesurés in situ (hauteurs d'eau, salinité, température, débits échangés avec la mer). Cela permettra ensuite de caractériser le fonctionnement physique de la lagune à l'aide de descripteurs hydrodynamiques (influence relative des différents forçages, temps de résidences...) puis d'en dégager une typologie saisonnière. Cette étude préliminaire a pour but d’estimer les volumes journaliers entrants et sortants à partir des données de hauteurs d’eau de part et d’autre des graus. Cette étude a été menée sur la lagune de Biguglia grâce à la méthode développée au LER-LR sur différents étangs du...
Tipo: Text Palavras-chave: Echanges mer/lagune; Hauteur d’eau; Grau; Hydrodynamique; Biguglia (lagune Corse).
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00214/32525/31011.pdf
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Physiological and behavioral responses of phytoplankton communities to nutrient availability in a disturbed Mediterranean coastal lagoon ArchiMer
Leruste, A.; Pasqualini, V.; Garrido, M.; Malet, Nathalie; De Wit, R.; Bec, Beatrice.
Short-term bioassays were conducted in Biguglia lagoon (Corsica) to study the physiological and behavioral responses of phytoplankton to N- and P-availability. Natural communities were collected in two stations representative of the two sub-basins, at three periods with contrasting environmental characteristics to address the impact of seasonal variability. These samples were separately enriched with a full N and P enrichment, and with enrichments minus N or minus P. Phytoplankton size structuration, diversity, and growth of the total phytoplankton, the micro-, nano- and ultraphytoplankton were evaluated using spectrofluorimetry, and optical microscopy. Results showed that the communities were fueled by NO3− in the wet periods (autumn and spring) and NH4+...
Tipo: Text Palavras-chave: Growth rate; Dilution experiment; Eutrophication; Functional traits.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00481/59238/61948.pdf
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Suivi estival des lagunes méditerranéennes françaises - Bilan des résultats 2014 ArchiMer
Derolez, Valerie; Oheix, Jocelyne; Ouisse, Vincent; Munaron, Dominique; Fiandrino, Annie; Messiaen, Gregory; Hubert, Clarisse; Lamoureux, Alice; Malet, Nathalie; Fortune, Martine; Berard, Lucas; Mortreux, Serge; Guillou, Jean-louis.
Le Réseau de Suivi Lagunaire (RSL), qui permettait d’évaluer l’état vis-à-vis de l’eutrophisation des lagunes du Languedoc-Roussillon, a pris fin en 2013. Une campagne DCE d’évaluation de l’état des masses d’eau côtières et de transition de la façade méditerranéenne est programmée en 2015. Ce rapport rend compte des suivis réalisés par Ifremer en 2014 sur 22 masses d’eau lagunaires du bassin Rhône-Méditerranée et Corse (financement AERMC). Un diagnostic de l’état des masses d’eau, intégrant l’état physico-chimique de la colonne d’eau et l’état du phytoplancton est établi pour les 22 masses d’eau (dont 4 oligo-mésohalines), à partir des données acquises sur la période 2009-2014, selon les critères et les grilles DCE. Trois masses d’eau (Thau,...
Tipo: Text Palavras-chave: Directive Cadre sur l’Eau (DCE); Lagunes; Masses d’eau de transition; Phytoplancton; Macrophytes; Sédiments..
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00273/38461/36864.pdf
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How to elaborate integrated management of transitional water ? Assessment of the reference state in Biguglia lagoon (Corsica, france) ArchiMer
Garrido, Marie; Cecchi, Philippe; Malet, Nathalie; De Wit, Rutger; Pasqualini, Vanina.
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00341/45211/44633.pdf
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Complementarity of the multidimensional functional and the taxonomic approaches to study phytoplankton communities in three Mediterranean coastal lagoons of different trophic status ArchiMer
Leruste, A.; Villeger, S.; Malet, Nathalie; De Wit, R.; Bec, B..
We used the individual-based multidimensional functional diversity and the taxonomic approaches in a complementary way to describe phytoplankton communities in three coastal lagoons with different eutrophication status in the South of France. We sampled communities during three seasons, i.e., in autumn, spring, and summer. Using classical taxonomy, 107 taxa/morphotypes were identified in the nine communities. The individual-based functional approach allowed grouping these individuals into 20 functional entities according to their values for 5 traits related to trophic adaptations (cell size, mobility, trophic regime, coloniality, and pelagic/benthic life). Some species (e.g., Prorocentrum micans) emerged in multiple functional entities, showing the...
Tipo: Text Palavras-chave: Classification; Functional entity; Functional traits; Taxonomic diversity.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00433/54454/55826.pdf
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Assessment of eutrophication of French Mediterranean lagoons in relation to meteorological interannual variability ArchiMer
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).
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/00008/11945/8651.pdf
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Marine diatoms sustain growth of bivalves in a Mediterranean lagoon ArchiMer
Pernet, Fabrice; Malet, Nathalie; Pastoureaud, Annie; Vaquer, Andre; Quere, Claudie; Dubroca, Laurent.
Carbon stable isotopes and fatty acids were measured in the suspended particulate organic matter (POM) of the Thau lagoon to study its qualitative temporal changes in relation to environmental factors and to identify the food sources of bivalves over a one-yr-cycle in relation to their growth. Reciprocally, the impact of shellfish farming on POM was also studied. Oysters and mussels were sampled and measured for biometry, stable isotopes and fatty acid composition. Water samples were collected at two sites, both inside and outside of the shellfish farming area, to determine concentrations in POM, chlorophyll a (Chl a) and stable isotopes. Carbon isotopes and fatty acids in bivalves reflected seasonal changes in food sources, which varied consistently with...
Tipo: Text Palavras-chave: Aquaculture; Bivalve; Competition; Feeding ecology; Growth; Trophic markers.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00075/18575/16177.pdf
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OBSLAG 2018 - volet eutrophisation. Lagunes méditerranéennes (période 2013-2018). Etat DCE de la colonne d'eau et du phytoplancton, tendance et variabilité des indicateurs ArchiMer
Derolez, Valerie; Bec, Béatrice; Munaron, Dominique; Foucault, Elodie; Fiandrino, Annie; Ouisse, Vincent; Messiaen, Gregory; Hatey, Elise; Connes, Coralie; Soudant, Dominique; Brun, Melanie; Fortune, Martine; Mortreux, Serge; Serais, Ophelie; Crottier, Anais; Malet, Nathalie.
Cette étude est réalisée dans le cadre du projet OBSLAG (OBServatoire des LAGunes) et porte sur les 10 masses d’eau lagunaires méditerranéennes situées à l’aval des cours d’eau suivis depuis 2015 par le « réseau flux » de l'Agence de l’Eau Rhône Méditerranée Corse. Le rapport correspond aux actions réalisées en 2018 dans le cadre du volet « eutrophisation » d’OBSLAG, répondant aux objectifs suivants : (1) réaliser un suivi estival en 2018 du phytoplancton et de la physico-chimie de l’eau et évaluer l’état DCE de ces compartiments pour la période 2013-2018 sur les 10 masses d’eau lagunaires du suivi « réseau flux », regroupant 13 lagunes poly-euhalines. Ce suivi permet de renforcer la fréquence des suivis DCE sur la colonne d’eau et le phytoplancton, qui ne...
Tipo: Text Palavras-chave: Directive Cadre sur l’Eau (DCE); Lagunes; Masses d’eau de transition; Eutrophisation; Phytoplancton; Confiance; Précision; Tendance..
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00507/61862/65959.pdf
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Cinétique d'acquisition du terroir Marennes-Oléron par l'huître creuse Crassostrea gigas : approche par les isotopes stables ArchiMer
Malet, Nathalie; Sauriau, Pierre-guy; Haure, Joel.
Japanese oysters previously reared in controlled conditions were replaced into the Marennes Oléron Bay on intertidal oyster parks during 2002 summertime. Kinetics of carbon and nitrogen isotope ratios was followed in 5 organs (digestive gland, gills, mantle, muscle and gonads). Results confirmed excepted significant differences in isotopie signatures between organs and revealed differences in the time required reaching equilibrium with the isotopie signatures of local food sources.
Tipo: Text Palavras-chave: Cinétique; Isotopes stables; Bassin de Marennes Oléron; Crassostrea gigas.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/2003/acte-6526.pdf
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Fifty years of ecological changes: Regime shifts and drivers in a coastal Mediterranean lagoon during oligotrophication ArchiMer
Derolez, Valerie; Malet, Nathalie; Fiandrino, Annie; Lagarde, Franck; Richard, Marion; Ouisse, Vincent; Bec, Beatrice; Aliaume, Catherine.
Thau lagoon is a large Mediterranean coastal lagoons and it supports traditional shellfish farming activities. It has been subject to eutrophication leading to major anoxic events associated with massive mortalities of shellfish stocks. Since the 1970s, improvements have been made to wastewater treatment systems, which have gradually led to oligotrophication of the lagoon. The aim of our study was to determine how the decrease in nutrient inputs resulted in major ecological changes in Thau lagoon, by analysing five decades of time-series (1970–2018) of observations on pelagic and benthic autotrophic communities. We were able to identify two periods during the oligotrophication process. Period 1 (1970–1992) was considered a eutrophic period, characterised...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00629/74068/73521.pdf
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OBSLAG 2016 - volet eutrophisation. Etat DCE des lagunes méditerranéennes (eau et phytoplancton, période 2011-2016). Développement d’indicateurs de tendance et de variabilité ArchiMer
Derolez, Valerie; Gimard, Antonin; Munaron, Dominique; Ouisse, Vincent; Messiaen, Gregory; Fortune, Martine; Poirrier, Samuel; Mortreux, Serge; Guillou, Jean-louis; Brun, Melanie; Provost, Charlotte; Hatey, Elise; Bec, Béatrice; Malet, Nathalie; Fiandrino, Annie.
Cette étude est réalisée dans le cadre du projet OBSLAG (OBServatoire des LAGunes) et porte sur les 10 masses d’eau lagunaires méditerranéennes situées à l’aval des cours d’eau suivis depuis 2015 par le « réseau flux » de l'Agence de l’Eau Rhône Méditerranée Corse. Le rapport correspond aux actions réalisées en 2016 dans le cadre du volet « eutrophisation » d’OBSLAG, répondant aux objectifs suivants : (1) réaliser un suivi estival du phytoplancton et de la physico-chimie de l’eau et évaluer l’état DCE de ces compartiments pour la période 2011-2016 sur les 10 masses d’eau lagunaires du suivi « réseau flux », regroupant 13 lagunes poly-euhalines. Ce suivi permet de renforcer la fréquence des suivis DCE sur la colonne d’eau et le phytoplancton, qui ne sont...
Tipo: Text Palavras-chave: Directive Cadre sur l’Eau (DCE); Lagunes; Masses d’eau de transition; Phytoplancton; Confiance; Précision; Tendance..
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00386/49744/50277.pdf
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Dynamics and sources of suspended particulate organic matter in the Marennes-Oléron oyster farming bay: Insights from stable isotopes and microalgae ecology ArchiMer
Malet, Nathalie; Sauriau, Pierre-guy; Ryckaert, Mireille; Malestroit, Pascale; Guillou, Gael.
The aim of this study was to distinguish between sources of the complex variety of Marennes-Oléron Bay suspended particulate organic matter (SPOM) contributing to the tropho-dynamics of the Marennes-Oléron oyster farming bay. Basic biomarkers (Chl a, C/N and POC/Chl a ratios), carbon and nitrogen stable isotopes from SPOM were analyzed and the microalgae community was characterized. The sampling strategy was bimonthly from March 2002 to December 2003; samples were taken from an intertidal mudflat. Four main sources contributed to the SPOM pool: terrigenous input from rivers, neritic phytoplankton, resuspended microphytobenthos and periodic inputs from intertidal Zostera noltii meadows. Seasonal fluctuations were observed in both years of the study period:...
Tipo: Text Palavras-chave: Heatwave; Zostera noltii; Mudflat; Microphytobenthos; Phytoplankton; Suspended particulate organic matter; Marennes Oléron Bay.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4313.pdf
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Phytoplankton strategies to exploit nutrients in coastal lagoons with different eutrophication status during re-oligotrophication ArchiMer
Leruste, A; Guilhaumon, F; De Wit, R; Malet, Nathalie; Collos, Y; Bec, Beatrice.
We studied a mesotrophic and a hypertrophic Mediterranean coastal lagoon, both of which had been simultaneously subjected to a nutrient input reduction for 9 yr. We compared these 2 lagoons to an oligotrophic coastal lagoon. Using bioassays comprising 24 h incubations with added phosphorus and/or ammonium, we investigated the response of the phytoplankton communities to nutrient enrichment during summer in terms of biomass, size class structure, abundance and growth. For nitrogen and phosphorus, we identified which nutrient limited phytoplankton growth, and what strategies of nutrient exploitation the communities adopted to cope with these limitations. Ultraphytoplankton dominated the 3 communities, but it differed in composition among the lagoons. Green...
Tipo: Text Palavras-chave: Growth rate; Nutrient limitation; Dilution experiment; HPLC.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00508/61978/66084.pdf
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Evaluation of FluoroProbe® performance for the phytoplankton-based assessment of the ecological status of Mediterranean coastal lagoons ArchiMer
Garrido, Marie; Cecchi, Philippe; Malet, Nathalie; Bec, Beatrice; Torre, Franck; Pasqualini, Vanina.
The European Water Framework Directive and several other legislations worldwide have selected phytoplankton for monitoring the ecological status of surface waters. This assessment is a complicated task in coastal lagoons due to their intrinsic variability, prompting moves to use real-time measurements. Here, we tested the ability of the submersible spectrofluorometer FluoroProbe® to accurately estimate the phytoplankton biomass and to efficiently discriminate spectral groups in Mediterranean coastal lagoons, by using sub-surface water samples (n = 107) collected at Biguglia lagoon (Corsica) in different environmental situations (salinity and trophic state) from March 2012 to December 2014. We compared the estimates of biomass and phytoplankton group...
Tipo: Text Palavras-chave: Phytoplankton; Monitoring; Mediterranean coastal lagoons; FluoroProbe (R); HPLC.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00484/59582/62623.pdf
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Fonctionnement hydrodynamique de la lagune de Biguglia. Partie 3 : Indicateurs et test de scenario hydro-climatiques ArchiMer
Dufresne, Christiane; Fiandrino, Annie; Malet, Nathalie.
       
Tipo: Text Palavras-chave: Modèle hydrodynamique; MARS3D; Lagune; Biguglia; Indicateurs hydrodynamiques.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00461/57302/68421.pdf
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Caractérisation des facteurs de risques associés au mortalités estivales - Synthèse du thème 3 - Risque associé au stress environnemental - 2002-2005 ArchiMer
Burgeot, Thierry; Gagnaire, Beatrice; Renault, Tristan; Haure, Joel; Moraga, D.; David, E.; Boutet, L.; Sauriau, P.g.; Malet, Nathalie; Bouchet, V.; Lapegue, Sylvie; Bouilly, Karine; Le Moullac, Gilles; Arzul, Genevieve; Knoery, Joel; Quiniou, Francoise; Bacher, Cedric; Soletchnik, Patrick.
Les mortalités d'huîtres observées sur les côtes françaises apparaissent principalement à proximité du sédiment et pendant la gamétogenèse. Les interactions de facteurs environnementaux sur les écosystèmes conchylicoles comme la température, les apports des bassins versants et le compartiment sédimentaire illustrent un risque de mortalité lié à différentes sources de stress (Thème 1). Les variations de la qualité de la ressource trophique pendant l'effort de gamétogenèse favorise une baisse de l'énergie disponible (Thème 2) et contraint l'organisme fragilisé à fournir un effort d'adaptation (Fent 2004). L'apparition d'un stress pendant cette période sensible des huîtres pourrait constituer un facteur aggravant de mortalité. L'objectif de cette étude est...
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Ano: 2006 URL: http://archimer.ifremer.fr/doc/00304/41538/40746.pdf
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Guide to macrophytes in Languedoc-Roussillon lagoons: identification and monitoring (Poster) ArchiMer
Oheix, Jocelyne; Lauret, Michel; Derolez, Valerie; Malet, Nathalie; Laugier, Thierry.
Guide de reconnaissance et de suivi des principales espèces de macrophytes dans les lagunes du Languedoc-Roussillon. Les lagunes du Languedoc-Roussillon sont étudiées depuis plusieurs années par le laboratoire Ifremer de Sète dans le cadre du RSL (Réseau de Suivi Lagunaire; http://rsl.cepralmar.com). Plusieurs compartiments (chimique et biologique) sont suivis pour étudier la principale pression qui s’exerce sur les lagunes : l’eutrophisation. Les peuplements de macrophytes présents dans les lagunes sont un bon indicateur de la qualité du milieu vis à vis de l’eutrophisation. Une méthode de suivi par les macrophytes est développée, qui nécessite la reconnaissance des espèces. Le guide de reconnaissance des macrophytes, destiné aux techniciens et aux...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00015/12666/9556.pdf
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Is FluoroProbe® an efficient tool for the quantification and the taxonomic discrimination of phytoplankton in lagoon environment (Mediterranean Sea)? ArchiMer
Garrido, Marie; Malet, Nathalie; Cecchi, Philippe; Bec, Béatrice; Pasqualini, Vanina.
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00341/45212/44631.pdf
Registros recuperados: 38
Primeira ... 12 ... Última
 

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