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| Registros recuperados: 50 | |
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| 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... |
| Tipo: Text |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00406/51794/52394.pdf |
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| Pete, Romain; Guyondet, Thomas; Bec, Beatrice; Derolez, Valerie; Cesmat, Ludovic; Lagarde, Franck; Pouvreau, Stephane; Fiandrino, Annie; Richard, Marion. |
| The decrease of microbial and nutrient inputs from the watershed has long dominated lagoon ecosystem management objectives. Phytoplankton biomass and abundance have drastically decreased for more than a decade and Zostera meadow have gradually recovered, expressing lagoon ecosystem restoration such as Thau lagoon. Do the progressive achievement of the good ecological status of the Thau lagoon possibly threatens the shellfish industry in terms of production and oyster quality, by reducing the carrying capacity? To provide answers about the right balance to be achieved between conservation and exploitation, a new numerical tool was developed to help in decision-making. We hereby propose to incorporate a Dynamic Energy Budget type shellfish production model... |
| Tipo: Text |
Palavras-chave: Shellfish farming; Carrying capacity; Stakeholder implication; Nitrogen and phosphorus inputs; Water frame directive; Ecological indicators; Phytoplankton depletion; Coupled biogeochemical-deb model. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00622/73395/75312.pdf |
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| Kermagoret, Charlene; Claudet, Joachim; Derolez, Valerie; Nugues, Maggy M.; Ouisse, Vincent; Quillien, Nolwenn; Baulaz, Yoann; Le Mao, Patrick; Scemama, Pierre; Vaschalde, Diane; Bailly, Denis; Mongruel, Remi. |
| One of the current major scientific challenges to sustain social-ecological systems is to improve our understanding of the spatial and temporal dynamics of the relationships between biodiversity, ecosystem functioning and ecosystem services. Here, we analyse the bundles of ecosystem services supplied by three coastal ecosystems (coastal lagoons, coral reefs and sandy beaches) along a gradient of eutrophication. Based on a state-and-transition model, we analyses the dynamic responses of ecological communities to environmental change and management actions. Although few exceptions are highlighted, increasing eutrophication in the three ecosystem types leads to a degradation of the ecosystem service bundles, particularly for nutrient and pathogen... |
| Tipo: Text |
Palavras-chave: Sandy beaches; Coral reefs; Coastal lagoons; Ecosystem service bundles; Temporal dynamics; Management. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00488/59930/63322.pdf |
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| De Wit, Rutger; Leruste, Amandine; Le Fur, Ines; Maki Sy, Mariam; Bec, Beatrice; Ouisse, Vincent; Derolez, Valerie; Rey-valette, Hélène. |
| By the end of the 20th century, many of the coastal lagoons along the French Mediterranean coast showed insufficient water quality and degraded ecosystem states due to anthropogenic impacts. Among these, nutrient over-enrichment, resulting in eutrophication, has been a major concern. The EU Water Framework Directive (WFD) has initiated public action to improve their water quality and ecosystem state using an approach rooted in restoration ecology. Here we analyze how this has been applied for the coastal lagoons in South France, considering eutrophication as an example of ecosystem degradation and oligotrophication as the corresponding trajectory for ecological restoration of the eutrophied coastal lagoons. Oligotrophication trajectories, initiated by the... |
| Tipo: Text |
Palavras-chave: Restoration ecology; Ecological restoration; Water quality; WFD; Ecosystem trajectories; DPSIR; Conservation; Ecological indices. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74145/73683.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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| 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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| Mongruel, Remi; Vanhoutte-brunier, Alice; Fiandrino, Annie; Valette, Francois; Balle-beganton, Johanna; Perez Agundez, José A.; Gallai, Nicola; Derolez, Valerie; Roussel, Sebastien; Lample, Michel; Laugier, Thierry. |
| This paper describes the building of an integrated simulation tool based on a systems approach, and its contribution to local political discussion of the mitigation of microbiological contamination of the water in a coastal area. Local management schemes view water quality as a high-priority environmental objective. In practice, how far this objective is achieved depends on trade-offs between the costs of improved water treatment facilities and the acceptable impacts of water contamination. An in-the-field experiment in collaboration with local managers was carried out in the Thau lagoon on the French Mediterranean coast during the SPICOSA (Science and Policy Integration for Coastal System Assessment) project, from 2007 through 2011. It consisted of... |
| Tipo: Text |
Palavras-chave: Systems modeling; Integrated assessment; Microbiological contamination; Technical options; Strategic planning. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00136/24775/22959.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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| 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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| 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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| 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... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74068/73521.pdf |
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| 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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| Menu, Marion; Vaz, Sandrine; Bajjouk, Touria; Derolez, Valerie; Fiandrino, Annie; Giraud, Anais; Grillas, Patrick; Ouisse, Vincent. |
| Coastal Mediterranean lagoons are often defined as homogeneous ecosystems that home many migratory and sedentary species. They also host strong salinity gradients, depth variation and very diverse plant communities, which create small-scale heterogeneity within lagoons. This is why each lagoon must be described as an entity by itself made up of a multitude of homogeneous features, called habitats, which support specific ecological functions for organisms (nursery, feeding, protection against predators...). Although many studies have resulted in collecting high numbers of physical, chemical and biological data in coastal Mediterranean lagoons, there is currently a lack of knowledge of the spatial distribution of these habitats. In our project, we (1)... |
| Tipo: Text |
Palavras-chave: Habitat; Cartographie; Typologie; Lagune méditerranéenne; Habitat; Map; Typology; Mediterranean lagoons. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00593/70545/73353.pdf |
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| Sargian, Peggy; Andral, Bruno; Derolez, Valerie. |
| Les programmes de surveillance liés à la mise en œuvre de la DCE sont coordonnés par le Ministère de l’Ecologie, du Développement Durable, des Transports et du Logement (MEDDTL). Dans chaque bassin hydrographique ce sont les Agences de l’eau qui, avec l’Etat, prennent en charge l’application, la mise en œuvre de ces réseaux. Sur la façade méditerranéenne, Ifremer a assuré pour le compte du Schéma Directeur des Données sur l’Eau la maîtrise d’ouvrage de la troisième campagne du contrôle de surveillance, en coordonnant l’ensemble de l’acquisition des données et de leur synthèse en collaboration avec de nombreux partenaires : les Universités, des bureaux d’études, des structures locales de gestion et les services de l’Etat. Les résultats de cette troisième... |
| Tipo: Text |
Palavras-chave: Surveillance; Phytoplancton; Benthos de substrat meuble; Posidonie; Macrophytes; Macroalgues; Substances prioritaires; Bioaccumulation; État biologique; État chimique; État écologique. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00170/28134/26354.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... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00357/46818/46683.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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| Serais, Ophelie; Amouroux, Isabelle; Derolez, Valerie. |
| With 750 producers, 2750 tables for breeding, 13 000 tons of oysters and 2 500 tons of mussels marketed every year, the shellfish production of the Thau lagoon represents at least 10 % of the national French production and a direct turnover of 33 millions € (Rey Valette, 2004). The Thau lagoon is a semi-enclosed coastal system sensitive to faecal inputs from the watershed (280 km2). In June 2004, the Autorithies classified the Thau lagoon as a « class B » area, from which live bivalve molluscs can be marketed for human consumption only after depuration. Until then, shellfish used to be collected for direct human consumption. The sanitary monitoring of the Thau lagoon shellfish growing area is conducted by the Ifremer french microbiological monitoring... |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00014/12572/9442.pdf |
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| Derolez, Valerie; Soudant, Dominique; Fiandrino, Annie; Cesmat, Ludovic; Serais, Ophelie. |
| Aims The Thau lagoon shellfish are regularly impacted by microbial pollution of faecal origin, which cause European health standards to be exceeded and closure of the shellfish harvest. The aims of this study were to investigate the impact of weather and hydrological conditions on Escherichia coli (E. coli) accumulation factor (AF) between water and oysters and to evaluate the relevance of the use of this ratio for the purpose of sanitary risk assessment. Methods and results Water and oysters (Crassostrea gigas) were sampled simultaneously in situ during 18 months in periods of dry weather and after rainfall events. Shellfish sanitary thresholds were exceeded in both periods. The E. coli AFs measured after rainfall (median = 6) were lower than in dry... |
| Tipo: Text |
Palavras-chave: E; Coli; Environmental health; Food safety; Shellfish; Water quality. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00119/23049/22503.pdf |
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| Registros recuperados: 50 | |
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