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Two decades of oligotrophication: Evidence for a phytoplankton community shift in the coastal lagoon of Thau (Mediterranean Sea, France) ArchiMer
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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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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Re-oligotrophication trajectories of macrophyte assemblages in Mediterranean coastal lagoons based on 17-year time-series ArchiMer
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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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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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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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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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 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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Spatiotemporal dynamics of submerged macrophyte status and watershed exploitation in a Mediterranean coastal lagoon: Understanding critical factors in ecosystem degradation and restoration ArchiMer
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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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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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 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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Le Réseau de Suivi Lagunaire : un outil de diagnostic et d’aide à l’action pour la lutte contre l’eutrophisation des lagunes. Une stratégie d’information et de transfert aux acteurs. ArchiMer
Daloz, Aurélien; Gaertner-mazouni, Nabila; Barral, Marc; Malet, Nathalie; Moragues, Laurent; Fiandrino, Annie; Laugier, Thierry; Derolez, Valerie; Munaron, Dominique.
Le RSL véritable outil de veille et d’aide à la décision, produit chaque année un diagnostic des lagunes de la Région Languedoc-Roussillon vis-à-vis de l’eutrophisation.Il permet ainsi d’alimenter les réflexions dans le cadre des démarches de gestion concertée, d’orienter la mise en œuvre d’action et les travaux de restauration prioritaires.
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/00008/11946/8652.pdf
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Mortalité du naissain d’Huître creuse Crassostrea gigas dans l’étang de Thau en 2009 ArchiMer
Pernet, Fabrice; Barret, Jean; Le Gall, Patrik; Malet, Nathalie; Pastoureaud, Annie; Munaron, Dominique; De Lorgeril, Julien; Bachere, Evelyne; Vaquer, Andre; Huvet, Arnaud; Corporeau, Charlotte; Normand, Julien; Boudry, Pierre; Moal, Jeanne; Quere, Claudie; Quilien, Virgile; Daniel, Jean-yves; Pepin, Jean-francois; Saulnier, Denis; Gonzalez, Jean-louis.
This study was conducted in the Mediterranean area during a mass mortality event of Pacific oyster Crassostrea gigas. The objectives of this work were to increase our understanding of the mass mortality phenomena in Pacific oysters, to identify risky cultivation practises and to propose mitigation strategies. In the first part of this work, we followed environmental parameters of the Thau lagoon in relation with mortality events. Then, we compared mortality and growth parameters of oysters as a function of their origins, their development stages and cultivation sites in relation with energetic, reproduction and pathogens. Finally, we conducted transfer experiments where oysters maintained free of mortality in open sea were transferred in the Thau lagoon...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11354/7927.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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An example of cooperation between scientist and managers : The Meditearranean Lagoon Network (Languedoc-Roussillon, France) ArchiMer
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...
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Ano: 2009 URL: http://archimer.ifremer.fr/doc/00002/11343/8101.pdf
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Fonctionnement écosystémique de la lagune de Biguglia. Partie 2 : Déploiement du modèle écosystémique GAMELag sur la lagune de Biguglia ArchiMer
Pete, Romain; Fiandrino, Annie; Malet, Nathalie.
Afin d’apporter des éléments de réponse quantitatifs à ces questions, un outil numérique GAMELag a été développé en collaboration avec l’UMR ECOSYM en se basant sur l’approche LOICZ. Par suite ce modèle « simple » (modèle en boîtes avec calcul de bilan de matière aux interfaces) a été affiné au cours de phases successives de validation. La présente étude vise à déployer le modèle écosystémique « GAMELag » permettant d’évaluer les flux et stock d’azote et de phosphore dans la lagune de Biguglia. L’objectif est de i) valider le fonctionnement du modèle sur la lagune de Biguglia et ii) de fournir aux gestionnaires des résultats en réponse à différents scenarios hydroclimatiques (année sèche/pluvieuse) ou selon différentes options de gestion, notamment...
Tipo: Text Palavras-chave: Modèle écosystémique; GAMELag; Flux; Stock; Azote; Phosphore; Scenarios écologiques.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00604/71564/70011.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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Changement climatique et données météorologiques infra-régionales en méditerranée occidentale. ArchiMer
Colmet-daage, Raphael; Malet, Nathalie; Dufresne, Christiane.
Traitement de données climatiques afin de définir des types de microclimats et d’en suivre l’évolution au cours des ans, en comparaison avec les microrégions voisines. Cette note n’a pas pour vocation de présenter une étude climatologique détaillée, ou encore des traitements statistiques poussés. Elle a pour objectif de permettre la caractérisation générale et comparative des différents contextes hydro-climatiques des sous-régions et des microrégions nécessaires à la compréhension du fonctionnement écologique de différents milieux de transition en cours d’étude. Il en ressort une méthodologie transposable à toutes micro-régions méditerranéennes et un panel de graphiques.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00461/57303/63363.pdf
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Flux d’eau et de nutriments extrapolation mensuelle et saisonnière. Etude réalisée sur la lagune de Biguglia et l’estuaire de Fiume Santu (Haute-Corse) ArchiMer
Colmet-daage, Raphael; Malet, Nathalie.
Les écosystèmes côtiers marins sont parmi les plus productifs au monde et jouent un rôle essentiel dans le cycle de la matière. Ces écosystèmes ont en effet une très forte capacité d'exportation de matière, de ressources trophiques et d'organismes. Ces milieux sont en particulier fortement influencés par les variations des conditions hydro-climatiques environnantes. C’est avec l’objectif de mieux comprendre le fonctionnement écologique de ces milieux de transition que la présente étude a été réalisée. L’objectif de cette étude est d’une part de mettre en place une méthodologie de mesure et de calcul des flux d’eau et de nutriments au sein de ces milieux de transition en Haute-Corse, et d’autre part d’extrapoler les résultats horaires à des simulations...
Tipo: Text Palavras-chave: Flux d’eau et de nutriments; Nutriments; Lagune; Estuaire méditerranéen; Debit; Milieu de transition.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60075/63397.pdf
Registros recuperados: 38
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