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| Registros recuperados: 50 | |
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| Derolez, Valerie; Soudant, Dominique; Malet, Nathalie; Chiantella, Claude; Richard, Marion; Abadie, Eric; Aliaume, Catherine; Bec, Beatrice. |
| Mediterranean costal lagoons have been exposed to anthropic eutrophication for decades. Thau lagoon is one of the largest among them and provides many ecosystem services including shellfish farming. Considerable efforts were made between the 1970s and the late 2000s to improve the wastewater treatment systems in the lagoon watershed. A decrease in nutrient inputs to Thau lagoon was subsequently observed, evidence for the start of a recovery process in Thau lagoon, following oligotrophication. This decrease has significant consequences for ecosystem communities, above all primary producers. In our study, we characterised and quantified long-term changes by analysing long monitoring time-series (1998-2016) of phytoplankton biomass, abundance and composition... |
| Tipo: Text |
Palavras-chave: Eutrophication; Oligotrophication; Nutrients; Recovery; Phytoplankton community shift; Mediterranean coastal lagoon. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74063/73514.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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| 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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| Le Fur, Ines; De Wit, Rutger; Plus, Martin; Oheix, Jocelyne; Derolez, Valerie; Simier, Monique; Malet, Nathalie; Ouisse, Vincent. |
| Since the mid-20th century, Mediterranean lagoons have been affected by eutrophication, leading to significant changes in primary producers. In the early 2000s, management actions have been implemented to reduce nutrient inputs with the aim to achieve a good ecological status as requested by the EU water framework directive. As a result of these actions, a sharp decline in nutrient loads has been recorded in several lagoons leading to an oligotrophication of the water column. The analyses of a long-term data set (1998-2015) of 21 polyhaline and euhaline lagoons with contrasting trophic status allowed us to infer a general scheme for the changes in macrophyte assemblages during the oligotrophication process. Placing hypertrophic and oligotrophic conditions... |
| Tipo: Text |
Palavras-chave: Submerged aquatic vegetation; Recovery; Nutrient reduction; Restoration; Long-term data series; Resilience; Regime shift; Coastal lagoon. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00474/58555/61110.pdf |
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| 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 |
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| Blanchet, Hugues; Gouillieux, Benoit; Alizier, Sandrine; Amouroux, Jean-michel; Bachelet, Guy; Barille, Anne-laure; Dauvin, Jean-claude; De Montaudouin, Xavier; Derolez, Valerie; Desroy, Nicolas; Grall, Jacques; Gremare, Antoine; Hacquebart, Pascal; Jourde, Jerome; Labrune, Celine; Lavesque, Nicolas; Meirland, Alain; Nebout, Thiebaut; Olivier, Frederic; Pelaprat, Corine; Ruellet, Thierry; Sauriau, Pierre-guy; Thorin, Sebastien. |
| Based on a parallel sampling conducted during autumn 2008, a comparative study of the intertidal benthic macrofauna among 10 estuarine systems located along the Channel and Atlantic coasts of France was performed in order to assess the level of fauna similarity among these sites and to identify possible environmental factors involved in the observed pattern at both large (among sites) and smaller (benthic assemblages) scales. More precisely this study focused on unraveling the observed pattern of intertidal benthic fauna composition and diversity observed at among-sites scale by exploring both biotic and abiotic factors acting at the among- and within-site scales. Results showed limited level of similarity at the among-site level in terms of intertidal... |
| Tipo: Text |
Palavras-chave: Estuaries; Macrozoobenthos; Diversity; Structuring Factors; WFD. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00179/29016/27444.pdf |
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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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| 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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| 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; 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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| 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/00170/28133/26353.pdf |
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| Bouchoucha, Marc; Derolez, Valerie; Munaron, Dominique; Gonzalez, Jean-louis; Cimiterra, Nicolas; Tomasino, Corinne. |
| En Méditerranée, des campagnes de surveillance sont mises en œuvre tous les 3 ans depuis 2006 pour répondre aux objectifs de surveillance des eaux côtières et de transition. Ce rapport présente les résultats de la cinquième campagne réalisée par l’Ifremer en 2018. Le caractère pluridisciplinaire de ces campagnes de surveillance a été maintenu pour d'une part répondre à l'ensemble des enjeux de la DCE, et, d’autre part, acquérir des données en lien avec le programme de surveillance de la Directive Cadre Stratégie pour le Milieu Marin (DCSMM, 2008/56/CE). La campagne 2018 a permis : - la mise en œuvre par l’Ifremer de stations artificielles de moules selon la méthodologie RINBIO dans l’ensemble des masses d’eau côtières (MEC) et sur 10 masses d’eau de... |
| Tipo: Text |
Palavras-chave: Surveillance; Méditerranée; DCE; Chimie; Phytoplancton; Macrophytes.. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00620/73224/72436.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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| 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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| 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; 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; Serais, Ophelie; Caprais, Marie-paule; Le Saux, Jean-claude; Messiaen, Gregory. |
| 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: Escherichia coli; Origine aviaire; Coquillage; Contamination fécale; Étang de Thau; Oiseau de mer; Bactériophage; Dépistage de la source microbienne; Temps sec; Escherichia coli; Avian source; Shellfish; Faecal contamination; Thau lagoon; Seabird; Bacteriophage; Microbial source tracking; Dry weather. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00025/13593/10659.pdf |
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| Registros recuperados: 50 | |
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