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Registros recuperados: 60
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Algal food processing by Stegastes nigricans, an herbivorous damselfish: differences between an undisturbed and a disturbed coral reef site (La Reunion, Indian Ocean) ArchiMer
Lison De Loma, Thierry; Harmelin-vivien, Mireille; Naim, Odile; Fontaine, Marie France.
There has, as yet, been little study of nutrient disturbance and its consequences on the functional biology of primary consumers in coral reefs. The processing of epilithic algal communities by the damselfish Stegastes nigricans was investigated at La Reunion, at two sites of a fringing reef, oligotrophic for one and eutrophic for the other. Differences between sites were analyzed in quantifying organic matter, organic carbon, nitrogen, and organic 'nutrients' (carbohydrate, lipid and protein) in the algal food, the digestive contents and the faeces of S. nigricans. In the disturbed site, algal turfs and digestive contents presented significantly higher organic matter, organic carbon, nitrogen and organic nutrient values. Absorption efficiency of total...
Tipo: Text Palavras-chave: Régime herbivore; Stegastes; Récif corallien; Eutrophisation; La Réunion; Herbivory; Stegastes; Coral reef; Eutrophication; La Reunion.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43376/42835.pdf
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Analyse statistique de l'évolution temporelle de paramètres hydrobiologiques dans les bassins du port du Havre ArchiMer
Menesguen, Alain; Laurec, Alain.
The study of the spatial structure and temporal evolution of several hydrobiological parameters in a flooding docks system provided a good illustration for the analytical power of a methodology dealing with the statistical processing of multivariate timeseries. This technique can be characterized by prior extraction of the trends, treated separately as ordinary multivariate data, and by a consequent multi-spectral analysis of the residual signais. This procedure offers the advantage of clarifying the analysis of the major features of the phenomenon (i.e. the trends) and unmasking the subtle spatio-temporal structure through the residual signais. The application on Le Havre harbour showed a strong enrichment in nutrients and also a plausible but partial...
Tipo: Text Palavras-chave: Analyse spectrale; Désaisonnalisation; Séries temporelles multivariées; Eutrophisation; Spectral analysis; Deseasonalisation; Multivariate time-series; Nutrient enrichment.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/00113/22466/20147.pdf
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Analyse statistique des données du RSL - Etude des trajectoires écologiques des lagunes entre 2001 et 2012 ArchiMer
Derolez, Valerie; Ouisse, Vincent; Fiandrino, Annie; Munaron, Dominique; Bissery, Claire; Kloareg, Maela.
Les questions abordées dans le présent rapport concernent la recherche et l’interprétation d’un repère de représentation des données du RSL (colonne d’eau et phytoplancton) pour l’ensemble des stations des lagunes de Provence-Alpes Côte d’Azur (PACA), Languedoc-Roussillon (LR) et Corse : 1) Est-il possible de trouver un repère pertinent de représentation des trajectoires d’évolution pour toutes les stations, en effectuant des regroupement par typologie de stations ? Comment interpréter les deux premiers axes de l’analyse en composantes principales (ACP) ? 2) Le premier axe des repères d’ACP constitue-t-il un « Gradient d’eutrophisation » ? 3) Est-il possible de mettre en évidence un effet météorologique sur les évolutions des teneurs en azote et phosphore...
Tipo: Text Palavras-chave: Lagunes; Eutrophisation; Restauration; Trajectoires; Nutriments; Phytoplancton..
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00173/28423/26754.pdf
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Apports d'origine agricole et qualité des eaux côtières ArchiMer
Merceron, Michel.
This summary and orientation document concerning the impact of agricultural activities on the quality of coastal waters summarises the main pollution, with the exception of organic microcontaminants. The excess of nutritive contributions is considered to be the most significant problem.
Tipo: Text Palavras-chave: Discharges; Salubrity; Eutrophication; Water quality; Débits; Salubrité; Eutrophisation; Qualité d'eau.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/rapport-2652.pdf
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Bilan méthodologique de l’outil de diagnostic de l’eutrophisation du RSL. Quatorze années de résultats en Région Languedoc-Roussillon ArchiMer
Ifremer.
Ce travail présente un bilan de l’outil de diagnostic de l’eutrophisation mis en oeuvre depuis 2000 dans le cadre du Réseau de Suivi Lagunaire. Cet outil repose sur l’étude de quatre compartiments : sédiments, macrophytes, colonne d’eau et phytoplancton. Un récapitulatif de la méthode actuelle de diagnostic et de ses évolutions depuis le début du RSL est présenté (pour chacun des compartiments puis pour la méthode de diagnostic complet). Des analyses statistiques ont permis d’étudier la pertinence de la stratégie de suivi et de la grille de diagnostic de chaque compartiment. Les résultats permettent de préconiser un maintien des stratégies de prélèvements du sédiment et des macrophytes et l’arrêt des suivis annuels de la colonne d’eau et du phytoplancton...
Tipo: Text Palavras-chave: Réseau de Suivi Lagunaire; Lagune; Eutrophisation; Méthode de diagnostic; Sédiment; Macrophytes; Phytoplancton; Colonne d’eau; Prélèvement; Analyse; Grille de qualité; DCE.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00165/27662/25839.pdf
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Caractéristiques du feutrage algal des récifs coralliens de Polynésie française soumis à différentes intensités de bioérosion ArchiMer
Le Bris, S; Le Campion-alsumard, T; Romano, Jc.
This study deals with the colonisation of experimental Porites blocks by epilithic and endolithic algal community in two atoll lagoons and two high-island lagoons in French Polynesia, exposed to different environmental conditions during a 5-year period. A qualitative analysis of the community (cyanobacteria and micro-algae) was carried out, and the relationship between the epilithic and endolithic strata observed. HPLC analysis of chlorophyll pigments was used to quantitatively determine the plant biomass, which was then compared to that of the algal turf of neighbouring reefs. The results show that these blocks are colonised according to two factors: the reef structure (atoll or high-island) and the degree of human disturbance. The epilithic and...
Tipo: Text Palavras-chave: Récif corallien; Feutrage algal épilithe et endolithe; Biomasse; Bioérosion; Eutrophisation; Coral reef; Epilithic and endolothic algal community biomass; Bioerosion; Eutrophication.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43652/43241.pdf
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Comprendre la structure et la dynamique du phytoplancton en réponse aux forçages naturels et anthropiques, et contribuer au développement des outils d’analyses automatisées. Vers un Système Intégré d’Observation. ArchiMer
Lefebvre, Alain.
Les écosystèmes marins sont soumis à des pressions d’origine anthropique très importantes depuis ces dernières décennies. Parmi ces pressions, les apports excessifs de nutriments vont impacter directement le phytoplancton et indirectement d’autres niveaux trophiques compromettant ainsi les biens et services écosystèmiques. On parle alors d’eutrophisation, phénomène répandu à l’échelle mondiale. La Manche orientale et la baie sud de la mer du Nord ne font pas exception. La partie française de cette zone est marquée par des proliférations massives de la Prymnésiophycée, Phaeocystis globosa, qui aboutiront au développement d’une mousse abondante et nauséabonde sur le littoral comme à des dysfonctionnements au sein des habitats benthique et pélagique. C’est...
Tipo: Text Palavras-chave: Manche; Baie sud de la mer du Nord; Eutrophisation; Habitat pélagique; Phytoplancton; Abondance; Diversité; Hydrologie; Climat; Observation; Surveillance; Écologie numérique; Modélisation; Haute fréquence; Systèmes automatisés; Stations instrumentées; Ferry Box..
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00360/47103/47027.pdf
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Contribution of climate variability to occurrences of anoxic crises 'malaigues' in the Thau lagoon (southern France) ArchiMer
Harzallah, Ali; Chapelle, Annie.
The Thau lagoon, located in southern France, suffers episodically in summer from anoxic crises known as 'malaigues'. Such crises mostly occur under warm conditions and low winds. In this paper we investigated effects of local weather conditions (air temperature, wind speed and precipitation over southern France), and two climate oscillations (the North Atlantic Oscillation and the El Ni (n) over tildeo Oscillation) on malaigue occurrences based on 33-year data series and dates when malaigues appeared. The study shows that the probability of occurrence of malaigues increases with increasing temperature and decreasing winds in August both mostly associated to the high phase of an index of North Atlantic Oscillation. Malaigues are found to be frequently...
Tipo: Text Palavras-chave: Lagoon; Thau; Malaigues; Anoxic crises; Climate variability; Lagune; Thau; Malaïgue; Eutrophisation; Variabilité climatique.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-517.pdf
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Détection satellitaire et modélisation opérationnelle de la production végétale non-fixée dans la bande côtière bretonne ArchiMer
Penard, Cédric.
The negative impact of the man on the environment unquestionably increases. The coastal environment as a whole is the maritime environment which is the most exposed to man-made eutrophication. For instance, nitrate loads to coastal waters off Brittany (France) have increased 10 times (from 3 to s 30mg L-1NO3) during the four last decades. Eutrophication of this coastal zone is now a recurrent problem, more and more worrying. This eutrophication exhibits two main forms : " green tides ", which are caused by local proliferations and stranding of green macro-algae (particularly the Ulva species) in nitrogen-enriched areas ; phytoplanktonic blooms, which are responsible for coloured water events, toxic species can be present (Pseudo-Nitzschia, Alexandrium,...
Tipo: Text Palavras-chave: Bande côtière bretonne; Modèle couplé hydrodynamique-biogéochimie; Nutriments; Chlorophyllea; Production primaire; Eutrophisation; Modèle opérationnel; Pseudo-Nitzschia; French Brittany coastal shelf; Hydrodynamical biogeochemical coupled model; Nutrients; Chlorophyll-a; Primary production; Eutrophication; Operational model; Pseudo-Nitzschia.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00015/12603/9481.pdf
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Effects of fish farming on seagrass (Posidonia oceanica) in a Mediterranean bay: seagrass decline after organic loading cessation ArchiMer
Delgado, O; Ruiz, J; Perez, M; Romero, J; Ballesteros, E.
The effects of fish farming on a seagrass (Posidonia oceanica) meadow at Fornells Bay, Minorca (Balearic Islands) were studied. Changes in plant and meadow features (e.g. shoot morphology, shoot density, biomass, rhizome growth, nutrient and soluble sugars concentrations...) in three stations along a transect from a disturbed (organic pollution due to fish cultures) to an undisturbed site were assessed. The fish culture had ceased in 1991; however, seagrass decline, already reported in a previous study for the period 1988-1990, was still taking place at the time of sampling (July 1994). Differences between stations were very clear; the station closest to the fish cages showed reduced shoot density, shoot size, underground biomass, sucrose concentration and...
Tipo: Text Palavras-chave: Aquaculture; Phanérogame marine; Posidonia oceanica; Eutrophisation; Caractéristique du sédiment; Aquaculture; Seagrass; Posidonia oceanica; Eutrophication; Sediment characteristics.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43632/43250.pdf
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Effet des conditions environnementales sur le développement des pathologies à Vibrio dans les élevages de crevettes en Nouvelle-Calédonie ArchiMer
Lemonnier, Hugues.
Shrimp aquaculture in New Caledonia is a developing industry, exclusively based on the species Litopenaeus stylirostris. However, it is subject to mortalities during grow out as observed all over the world. Since 1993, shrimp reared during the cold period are affected by a disease named "syndrome 93". As a consequence, the whole industry has become seasonal and produces essentially during the warm season. The climatic conditions during the periods of transition between the two main seasons could be responsible for an environmental stress and the origin reason for mortality outbreaks. Stocking density is the main risk factor. It increases the probability of the appearance and development of the epizooty in the pond. The "Summer Syndrome", a septicemic...
Tipo: Text Palavras-chave: New Caledonia; Risk factors; Environmental stress; Vibriosis; Epizooty; Pond management; Eutrophication; Pond health; Shrimp; Litopenaeus stylirostris; Peneids; Aquaculture; Nouvelle Calédonie; Facteur de risque; Stress environnemental; Vibrioses; Pratiques d'élevage; Eutrophisation; Santé de l'écosystème bassin; Crevette; Litopenaeus stylirostris; Pénéides; Aquacultre.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-2643.pdf
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Etude de Ruppia cirrhosa dans la lagune de Canet‐St‐Nazaire ArchiMer
Oheix, Jocelyne; Ouisse, Vincent; Munaron, Dominique; Le Fur, Ines; Derolez, Valerie.
L'herbier de Ruppia cirrhosa a connu des périodes de fortes régressions et de reprises dans la lagune de Canet-St-Nazaire. Pour mieux comprendre ces fluctuations, une étude bibliographique de la physiologie de la phanérogame Ruppia cirrhosa est réalisée, associée à l'analyse des données disponibles dans la lagune de Canet (acquises notamment dans le cadre du Réseau de Suivi Lagunaire). Les éléments influant sur le développement ou la régression de Ruppia cirrhosa sont étudiés à la lumière des connaissances bibliographiques. L'eutrophisation et la contamination chimique, associées à des paramètres environnementaux parfois défavorables ont pu contribuer au déclin de l'herbier après 2002. Les conditions qui ont permis la reprise de l'herbier à partir de 2011...
Tipo: Text Palavras-chave: Ruppia cirrhosa; Lagune de Canet-St Nazaire; Parametres hydrologiques; Eutrophisation; Consommation de l'herbier; Contamination chimique.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00280/39091/37656.pdf
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Etude intégrée du secteur Loire Vilaine : synthèse des connaissances, analyse des problématiques ArchiMer
Baudrier, Jérôme.
The coastal area located between Quiberon and Noirmoutier is influenced by dilution plumes of the Loire and Vilaine rivers. Dysfunctions linked with a growing eutrophication of the environment have been observed over the last decades. Important imbalances such as massive deaths of the fauna in open embayments and more and more appearances of red tides give the area a unique character. Other environ mental problems are likely to disrupt human activites in the near future (bays silting up, quality of coastal water worsening, overfishing ...). This is why there is a real need to gather information on the subject. This will make it possible to identify problems and gaps in the area. Beside presenting pieces of information, the study offers various reflection...
Tipo: Text Palavras-chave: Loire; Vilaine; Panaches de dilution; Eutrophisation; Déséquilibres; Écosystème.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00016/12702/9624.pdf
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Etude Sédimentaire Appliquée à l'Aquaculture pour Cinq Estrans de Bretagne Sud (Morbihan et Loire Atlantique). ArchiMer
Lemoine, Gérard.
Within the national molluscan monitoring network, a sedimentary study was carried out on five experimental sites located in southern Brittany (i.e., from Etel to Pen-Bé rivers). The study aimed to specify sediment integrating characteristics with regards to hydrobiological variables. Moreover, interactions between sediment and water column characteristics were specified. It appears that this approach is likely unappropriate to characterize interdical rearing area productivity. However, this approach can support the site evaluation on a long term basis to sustain shellfish culture management. This would require additional study to assess sediment reactivity to abnormal events like drastic salinity decrease.
Tipo: Text Palavras-chave: Sédiment; Ostréiculture; Estran; Phosphore; Eutrophisation; Sediment; Oyster culture; Intertidal area; Phosphorus; Eutrophication.
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00102/21344/18967.pdf
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Évaluation du descripteur 5 « Eutrophisation » en France métropolitaine. Rapport scientifique pour l’évaluation 2018 au titre de la DCSMM ArchiMer
Devreker, David; Lefebvre, Alain.
This report is the second assessment of French marine water eutrophication status (descriptor 5) done in the framework of the MSFD. The goal of this report is to determine if French marine water reach the Good Ecological State as defined by the MSFD. It stands next to the initial evaluation made in 2012, from which it is an update. It introduces the second cycle of the Marine Environment Action Program. It shows that French marine waters, behind the 12 nm line, reach the GES as defined by the MSFD. Problems link to eutrophication occurs in marine waters above the 12 nm, where 6.5% of the area do not reach the GES.
Tipo: Text Palavras-chave: DCSMM; Eutrophisation; Évaluation; Bon Etat Ecologique; Seuils; Indicateurs; Nutriments; Chlorophylle-a; Oxygène; Turbidité; Macroalgues; Pressions écologiques; MSFD; Eutrophication; Assessment; Good Environmental Status; Thresholds; Indicators; Nutrients; Chlorophyll-a; Oxygen; Turbidity; Macroalgae; Ecological pressures..
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00437/54868/56361.pdf
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Guide de reconnaissance et de suivi des macrophytes des lagunes du Languedoc-Roussillon ArchiMer
Lauret, Michel; Oheix, Jocelyne; Derolez, Valerie; Laugier, Thierry.
The guide to macrophytes in Languedoc-Roussillon’s lagoons has been realised in the context of Mediterranean Lagoon Monitoring Network (LMN). It aims to provide knowledge on the macrophytes to the lagoons managers. The guide is divided into two parts. The first part deals with biology and ecology of the macrophytes and different methods of macrophyte monitoring. The second part is composed of cards of the most occurent species in lagoons, illustrated with photographs to make the identification easier.
Tipo: Text Palavras-chave: Macrophytes; Macroalgues; Biologie; Écologie; Eutrophisation.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15416/12943.pdf
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Inventaire des ulves en Bretagne. Année 1997. Rapport de synthese ArchiMer
Merceron, Michel.
The yearly study of Ulva in Brittany aims at building a time series of its proliferations and corresponding nutrient loadings. The goal is to detect results of wilful loading reductions, and to distinguish them from natural variations. This first actually quantified study is the starting bench-mark of the process. Forty-five concerned sites were listed in 1997. They are nearly the same as in 1988, 1991 and 1994 (previous rough census). The Côtes d'Armor and then the Finistère are the most affected departments. The Morbihan is less and file et Vilaine not at all. Ulva biomass was precisely quantified in about fifteen locations during the growing season, along with nitrogen loadings of local streams (mostly nitrate). The fluxes of nitrogen - the limiting...
Tipo: Text Palavras-chave: Bretagne; Nitrate; Prolifération; Ulve; Eutrophisation; Brittany; Nitrate; Proliferation; Ulva; Eutrophication.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/1998/rapport-1580.pdf
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Inventaire des Ulves en Bretagne année 1998 - rapport de synthèse ArchiMer
Merceron, Michel.
The 1998 survey of green tides on the Brittany coast was performed in the same way as that of 1997 in order to allow comparison. 11 includes an inventory ofail the concerned sites, and a precise assessment ofthirteen ofthem, the most loaded. On these ones, nitrogen fluxes were surveyed during the critical period, and the green seaweed stock on the beach and in the first waves was quantified. The climatic conditions were opposite between the two years, very dry in spring and summer 1997, and wet in 1998. The irradiance contrast was inverse, and less pronounced. The nitrate contents and mostly the flows were more important in 1998. They generated nitrogen fluxes about 3.3 times those of 1997. The total number of sites concerned in 1998 is clearly higher than...
Tipo: Text Palavras-chave: Bretagne; Nitrate; Prolifération; Ulve; Eutrophisation; Brittany; Nitrate; Proliferation; Ulva; Eutrophication.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/rapport-2665.pdf
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La crise anoxique du bassin de Thau de l'été 1997. Bilan du phénomène et perspectives ArchiMer
Souchu, Philippe; Abadie, Eric; Vercelli, Catherine; Buestel, Dominique; Sauvagnargues, Jean-claude.
La crise anoxique ou «malaïgue» qui a sévi dans le bassin de Thau durant l'été 1997 a détruit presque le tiers de la production annuelle d'huîtres. Son déclenchement a suivi une période durant laquelle les vents étaient exceptionnellement faibles. Après un rappel scientifique des processus mis en jeu, la crise anoxique est décrite au travers des observations de mortalités et des concentrations en oxygène dissous. Les eaux anoxiques se sont développées dans les zones conchylicoles vers l'Est et l'Ouest à partir d'un foyer situé à proximité du principal port conchylicole (Mourre-Blanc à Mèze). La comparaison de la crise de 1997 avec celles qui l'ont précédée fait apparaître un recul de l'eutrophisation depuis 25 ans. En revanche, des secteurs très localisés...
Tipo: Text Palavras-chave: Lagunes; Thau; Conchyliculture; Anoxies; Eutrophisation; Crassostrea gigas.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00039/15010/12336.pdf
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le Bulletin du Réseau de Suivi Lagunaire Languedoc-Roussillon. Bilan des résultats 2006 et nature du suivi 2007 ArchiMer
Tipo: Text Palavras-chave: Réseau de Suivi lagunaire; Lagune; Eutrophisation; Bilan; Résultat; Programme; Suivi; Qualité; Eau.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00319/43008/42524.pdf
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