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| Registros recuperados: 21 | |
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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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| 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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| Richard, Marion; Bourreau, Juliette; Montagnani, Caroline; Ouisse, Vincent; Le Gall, Patrik; Fortune, Martine; Munaron, Dominique; Messiaen, Gregory; Callier, Myriam; Roque D'Orbcastel, Emmanuelle. |
| Ostreid herpesvirus 1 (OsHV-1 μvar) infection has caused significant mortalities in juvenile oysters (Crassostrea gigas). In contrast to the practices of other animal production industries, sick and dead oysters are not separated from live ones and are left to decay in the surrounding environment, with unknown consequences on fluxes of dissolved materials. A laboratory approach was used in this study to test the influence of oyster mortality episode on dissolved inorganic fluxes at the oyster interface, dissociating (i) the effect of viral infection on metabolism of juvenile oysters and (ii) the effect of flesh decomposition on oxygen consumption and nutrient releases at the individual scale. Nine batches of juvenile oysters (Individual Total wet weight... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Mortality; Ostreid herpesvirus 1; Juvenile; Spat; Mineralisation; Oxygen consumption; Nutrient fluxes. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00378/48973/49380.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; 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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| Ouisse, Vincent; Fiandrino, Annie; Malet, Nathalie; Munaron, Dominique; Fortune, Martine; Oheix, Jocelyne; Baleux, Maeva; Lagarde, Franck; Le Noc, Sandrine; De Wit, Rutger. |
| Increased nitrogen and phosphorus inputs from watersheds, especially since the 1960s with the increased anthropogenic activities is recognized as a major cause of environmental degradation of coastal ecosystems. On the Mediterranean coast, lagoons are particularly affected by the eutrophication leading to significant changes in ecosystem structure, functioning and services. Since 2000, the “Région Languedoc-Roussillon”, the “Agence de l’Eau Rhône Mediterranée & Corse” and Ifremer developed a lagoon monitoring network (RSL) focusses upon eutrophication to assess and monitor status of 24 lagoons of Languedoc-Roussillon and Corsica. Many actions on watershed led to a significant reduction of nutrient inputs. However, the time required to restore these... |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00118/22899/20717.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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| 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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| Registros recuperados: 21 | |
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