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| Registros recuperados: 39 | |
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| Derolez, Valerie; Bec, Béatrice; Grillas, Patrice; Sanchez, Ana Elena; Raimbault, Patrick. |
| In the context of WFD implementation on Mediterranean lagoons, work has been carried out since 2010 by Ifremer, Tour du Valat and IRSTEA (Onema and AERM & C fundings), to assess the relevance of macrophytes and macrofauna indicators for oligohaline and mesohaline lagoons (mean salinity <18 PSU). The question of the relevance of indicator metrics and thresholds for the "phytoplankton" biological quality element also arises, especially due to the confined nature of olgo-mesohaline lagoons. The objective of this study is to characterize the abundance and composition of phytoplankton on 5 oligo and mesohaline lagoons of the French Mediterranean coast (Scamandre, Crey, Charnier, Bolmon and Grand Palun). Analyses of accessory pigments (chlorophyll and... |
| Tipo: Text |
Palavras-chave: Lagunes; Méditerranée; Oligohalin; Mésohalin; Phytoplancton; Cytométrie; Pigments chlorophylliens; Lagoons; Mediterranean Sea; Oligohaline; Mesohaline; Phytoplankton; Cytometry; Chlorophyll pigments.. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00357/46816/46682.pdf |
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| Grillas, Patrick; Derolez, Valerie; Bec, Béatrice; Ximenes, Marie-claude; Giraud, Anaïs. |
| L’objectif général de ce travail est d’adapter les grilles DCE de qualité nutriments et phytoplancton (abondance et biomasse) pour les lagunes oligo et mésohalines méditerranéennes. Par la position intermédiaire entre les eaux marines et continentales (douces) la recherche d’indicateurs pour les lagunes oligo et mésohalines peut contribuer à assurer la continuité eaux douces/eaux marines dans l’application de DCE. · Sur la base des relations entre EQRPHY et les concentrations en azote total et phosphore total, des seuils de concentrations pour caractériser les lagunes oligo-mésohalines peuvent être proposés. · Les seuils proposés sont sensiblement supérieurs à ceux des lagunes poly-euhalines. Un tel résultat est attendu compte tenu des niveaux trophiques... |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00357/46818/46683.pdf |
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| Laugier, Thierry; Malet, Nathalie; Munaron, Dominique; Derolez, Valerie; Fiandrino, Annie; Barral, Marc; Moragues, Laurent; Mazouni, Nabila; Graille, Chantal. |
| The poster presents the approach that led to the construction of a network of cooperation between managers and scientists for coastal lagoon management in the region of Languedoc-Roussillon, its architecture and modus operandi, its achievements and developments over time. At the end of the ninety’s, eutrophication and lack of knowledge were identified as issues to enhance the management of coastal lagoons on the Mediterranean coast of France. In 2000, in the region of Languedoc-Roussillon, scientists (Ifremer) and institutional managers (Regional Council of Languedoc-Roussillon and Water Agency Rhône-Méditerranée & Corse) joined their forces in building a network to address this need. The core of this network consists of an operational tool for the... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00002/11343/8101.pdf |
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| Newton, Alice; Brito, Ana C.; Icely, John D.; Derolez, Valerie; Clara, Ines; Angus, Stewart; Schernewski, Gerald; Inacio, Miguel; Lillebo, Ana I.; Sousa, Ana I.; Bejaoui, Bechir; Solidoro, Cosimo; Tosic, Marko; Canedo-arguelles, Miguel; Yamamuro, Masumi; Reizopoulou, Sofia; Tseng, Hsiao-chun; Canu, Donata; Roselli, Leonilde; Maanan, Mohamed; Cristina, Sonia; Ruiz-fernandez, Ana Carolina; De Lima, Ricardo F.; Kjerfve, Bjorn; Rubio-cisneros, Nadia; Perez-ruzafa, Angel; Marcos, Concepcion; Pastres, Roberto; Pranovi, Fabio; Snoussi, Maria; Turpie, Jane; Tuchkovenko, Yurii; Dyack, Brenda; Brookes, Justin; Povilanskas, Ramunas; Khokhlov, Valeriy. |
| The natural conservation of coastal lagoons is important not only for their ecological importance, but also because of the valuable ecosystem services they provide for human welfare and wellbeing. Coastal lagoons are shallow semi-enclosed systems that support important habitats such as wetlands, mangroves, salt-marshes and seagrass meadows, as well as a rich biodiversity. Coastal lagoons are also complex social-ecological systems and the ecosystem services that lagoons deliver provide livelihoods, benefits wellbeing and welfare to humans. This study assessed, quantified and valued the ecosystem services of 32 coastal lagoons. The main findings of the study were: (i) the definitions of ecosystem services are still not generally accepted; (ii) the... |
| Tipo: Text |
Palavras-chave: Coastal lagoons; Ecosystem services; Climate change; Human welfare; Benefits; Wellbeing. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00427/53879/57166.pdf |
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| 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 |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00008/11945/8651.pdf |
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| Meinesz, Coralie; Derolez, Valerie; Bouchoucha, Marc. |
| Les objectifs de résultats, en termes de préservation ou de restauration des milieux aquatiques, que fixent la Directive Cadre sur l’Eau (2000/60/CE), nécessitent de connaître les liens entre l’état des masses d’eau et les pressions auxquelles elles sont soumises. L’évaluation de l’état des lagunes méditerranéennes est notamment basée sur différents éléments de qualité biologique (phytoplancton, macrophytes, macrofaune benthique de substrat meuble). La présente étude s’applique à recenser les pressions anthropiques sur les lagunes méditerranéennes, les bancariser et analyser les liens entre les indicateurs de qualité biologique de la DCE et des indicateurs de pressions pertinentes issus de ce recensement. Le travail d’identification des pressions et de... |
| Tipo: Text |
Palavras-chave: Pressions; Lagunes méditerranéennes; Lien état-pression; DCE. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00154/26496/24607.pdf |
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| Derolez, Valerie; Fiandrino, Annie; Munaron, Dominique; Cadoret, Marine. |
| L’objectif de cette étude est de mettre en évidence et de hiérarchiser les pressions anthropiques ayant le plus d’impact sur les éléments de qualité DCE sur les lagunes méditerranéennes et de consolider ainsi les liens état/pressions. Il s’agit également de mettre en évidence des groupes de masses d’eau homogènes en termes de pressions. Ce travail s’appuie sur les précédentes études menées sur le sujet (Battut, 2010 ; Bouchoucha et al., 2010 ; Meinesz et al., 2013) et vise à les compléter grâce : • à la mise en œuvre d’une approche descriptive multidimensionnelle qui permet de mettre en évidence les interactions entre les différentes métriques de pression et d’état et de regrouper les masses d’eau similaires, • à l’intégration de données de pression et... |
| Tipo: Text |
Palavras-chave: Lagunes; Pressions anthropiques; État DCE. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00254/36574/35112.pdf |
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| Richard, Marion; Bec, Beatrice; Vanhuysse, Charles; Mas, Sébastien; Parin, David; Chantalat, Camila; Le Gall, Patrik; Fiandrino, Annie; Lagarde, Franck; Mortreux, Serge; Ouisse, Vincent; Rolland, Jean-luc; Degut, Anaïs; Hatey, Elise; Fortune, Martine; Roque D'Orbcastel, Emmanuelle; Messiaen, Gregory; Munaron, Dominique; Callier, Myriam; Oheix, Jocelyne; Derolez, Valerie; Mostajir, Behzad. |
| Oysters modify the planktonic microbial community structure by their filtration and NH4 excretion activities. While many studies have been conducted on this subject with adult oysters, none had been carried out in situ with juveniles. Pacific oyster juveniles (Magallana gigas, previously Crassostrea gigas) died massively all over the world since 2008 in relation with OsHV-1 infection. During mortality episodes, sick and dead oysters are not separated from healthy live ones, and left to decay in the surrounding environment, with unknown consequences for the nutrient cycle and planktonic microbial components (PMC). The present study aimed to elucidate for the first time the interactions between oyster juveniles and PMC during a mortality episode. Innovative... |
| Tipo: Text |
Palavras-chave: Magallana gigas; Crassostrea gigas; Spat; OsHV-1 mu Var; Mortality; Picoplankton; Heterotrophic flagellates; Ciliates; Uronema; Balanion. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00474/58559/61115.pdf |
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| Le Saux, Jean-claude; Derolez, Valerie; Brest, G.; Le Guyader, Soizick; Pommepuy, Monique. |
| For shellfish, the viral contamination clearly occurs in the first step of the process i.e. in growing and harvesting areas. As opposed to other foods, there is no proof that other routes (foodhandlers, aerosol), could be at the origin of the seafood contamination (Koopmans & Duizer, 2004). Most of the time, untreated sewage are at the origin of the presence of viruses in shellfish. However, direct contamination by ill people working in the growing area, has also been reported (Berg et al., 2000; Butt et al, 2004). |
| Tipo: Text |
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| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/00066/17733/15254.pdf |
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| Derolez, Valerie; Oheix, Jocelyne. |
| Dans le contexte de la mise en œuvre de la Directive Cadre sur l’Eau (DCE) dans les lagunes méditerranéennes, un diagnostic de la qualité des peuplements de macrophytes est effectué tous les trois ans. Certaines lagunes du bassin Rhône Méditerranée et Corse sont caractérisées par des profondeurs importantes, qui peuvent constituer une limite naturelle au développement des espèces de référence, dont les herbiers de zostères et de cymodocées représentent la part la plus importante en terme de recouvrement. L’objectif de ce rapport est d’analyser les diagnostics des macrophytes et l’impact des stations profondes de plus de 5 mètres sur la qualité des diagnostics pour les étangs de Ponant, Diana, Urbino, Thau et Berre. Cette analyse est complétée par des... |
| Tipo: Text |
Palavras-chave: DCE; Lagunes; Macrophytes; Zostères. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00114/22528/20205.pdf |
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| Derolez, Valerie; Leurion, Axel; Fiandrino, Annie. |
| In the context of the update of the inventory of water bodies of the Rhone-Mediterranean and Corsican (RM & C) basin, an assessment of pressures and impacts on the lagoons is expected during the second water management plan (2010-2015) of the Water Framework Directive (WFD). Pressures due to pollutant inputs may have a varying impact on lagoons, according to their degree of interaction with the sea. The more exchanges with the sea will be high, the more export opportunities and dilution of pollutants will be high. The more exchanges will be limited, the more pollutants will accumulate in the lagoons, making then more vulnerable to inputs. The objective of this work is to propose, for the 28 lagoons (21 transition water bodies) of RM & C Basin, an... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00094/20558/18231.pdf |
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| Serais, Ophelie; Derolez, Valerie; Caprais, Marie-paule. |
| Microbes regularly contaminate Thau lagoon shellfish. Between 1997 and 2007, 18% of the analyses carried out in dry weather recorded more than 230 Escherichia coli / 100 g of bivalves (Ifremer French microbial monitoring network), leading the administration to restrict the shellfish harvest area, including suspension of production. This study aims to determine, the contribution of seabirds, which roost at night on the Thau lagoon shellfish growing frames, to shellfish faecal pollution in dry weather. Data were collected in 2008 from both the drainage area (pollution input) and the lagoon (water quality and microbial monitoring, seabird counts) in dry weather. The data showed that, with no watershed input or lagoon resurgence, microbial contaminants were... |
| Tipo: Text |
Palavras-chave: Etang de Thau; Contamination microbiologique; Contamination aviaire; E. coli; Coquillages. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00042/15337/12689.pdf |
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| Derolez, Valerie; Giraud, Anaïs. |
| Trois masses d’eau situées sur le littoral de l’île de la Réunion et de la Martinique présentent des fonctionnements et des caractéristiques atypiques, ce qui pose actuellement des difficultés dans le cadre de l’application de la DCE. Les deux masses d’eau réunionnaises, l’étang du Gol et l’étang de Saint-Paul, sont actuellement identifiées en tant que plans d’eau au titre de la DCE. La masse d’eau martiniquaise, l’étang des Salines, est quant à elle identifiée en tant que masse d’eau de transition. L’objectif de cette étude est d’apporter une expertise, sur la base des données disponibles et des échanges avec les experts locaux et nationaux, concernant : · la typologie des masses d’eau, · les paramètres chimiques, physico-chimiques et biologiques... |
| Tipo: Text |
Palavras-chave: Masses d’eau de transition; Typologie; La Réunion; Martinique; DCE; Surveillance. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00335/44573/44289.pdf |
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| Leruste, A.; Malet, Nathalie; Munaron, Dominique; Derolez, Valerie; Hatey, E.; Collos, Y.; De Wit, R.; Bec, B.. |
| Along the French Mediterranean coast, a complex of eight lagoons underwent intensive eutrophication over four decades, mainly related to nutrient over-enrichment from continuous sewage discharges. The lagoon complex displayed a wide trophic gradient from mesotrophy to hypertrophy and primary production was dominated by phytoplankton communities. In 2005, the implementation of an 11 km offshore outfall system diverted the treated sewage effluents leading to a drastic reduction of anthropogenic inputs of nitrogen and phosphorus into the lagoons. Time series data have been examined from 2000 to 2013 for physical, chemical and biological (phytoplankton) variables of the water column during the summer period. Since 2006, total nitrogen and phosphorus... |
| Tipo: Text |
Palavras-chave: Phytoplankton; Coastal lagoons; Nutrient; Sewage effluents; Re-oligotrophication. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00346/45701/45324.pdf |
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| Registros recuperados: 39 | |
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