WorldCat Identities

Stora, Georges

Overview
Works: 16 works in 34 publications in 2 languages and 79 library holdings
Genres: Conference papers and proceedings  Academic theses 
Roles: Thesis advisor, Author, Editor, htt
Classifications: GC2, 577.7
Publication Timeline
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Most widely held works by Georges Stora
Global change : mankind-marine environment interactions : proceedings of the 13th French-Japanese Oceanograph Symposium by Hubert J Ceccaldi( )

11 editions published in 2011 in English and held by 39 WorldCat member libraries worldwide

Based on the material presented at a conference organized by the Centre d'Océanologie of Marseille, held in 2008, this text covers a wealth of hot topics related to the way mankind interacts with the marine environment. With the state of our oceans and seas becoming an increasing source of concern worldwide, this timely addition to the debate features the latest research in both France and Japan. The book's chapters present work on many of the key areas of oceanographic study. The concept of marine biodiversity is treated, in particular how it is affected by human agency and invasive species, many of which have been introduced anthropogenically. Coastal zones are analyzed in detail, with a focus on the interaction between ports and natural environments, and the ecological and economical consequences of this relationship. A chapter on aquaculture looks at ecologically sound management as well as the preservation of resources. New and emerging technologies that aid our observation of the marine environment are covered, as is the physical, chemical, biological and biogeochemical functioning of natural and man-made environments. Featuring work by some of the leading researchers in the field from both France and Japan, this work demonstrates the strength of the links between the two scientific communities, and is an important contribution to the ongoing discussion on the effects of global warming as well as mankind's impact on the marine environment we depend on for so much
Etude expérimentale de la bioturbation en milieux littoral et profond : quantification des structures de bioturbation et modélisation du remaniement biologique du sédiment by Magali Gerino( Book )

2 editions published in 1992 in French and held by 6 WorldCat member libraries worldwide

LES OBJECTIFS DE CETTE ETUDE ONT ETE DE DEFINIR LES POTENTIALITES DE BIOTURBATION PAR LE MACROBENTHOS, QUANTIFIER LES STRUCTURES DE BIOTURBATION, MODELISER ET ESTIMER L'INTENSITE DU MELANGE BIOLOGIQUE DU SEDIMENT SUR LES SITES CHOISIS ET METTRE EN EVIDENCE L'INCIDENCE DE CES PHENOMENES SUR LES FLUX A TRAVERS L'INTERFACE EAU-SEDIMENT. LES RECHERCHES ONT ETE DEVELOPPEES EN MILIEU LITTORAL DANS LE GOLFE DE FOS ET EN MILIEU PROFOND DANS 3 CANYONS MEDITERRANEENS (TOULON, GRAND-RHONE, LACAZE-DUTHIERS) ET EN ATLANTIQUE DANS LE CANYON DU CAP FERRET. D'UNE MANIERE GENERALE, ON CONSTATE UNE RELATION POSITIVE ENTRE L'ABONDANCE DU MACROBENTHOS ET LA DENSITE DES STRUCTURES, MAIS DANS LA COUCHE SUPERFICIELLE DU SEDIMENT, LES STRUCTURES SONT RAPIDEMENT DETRUITES PAR LE REMANIEMENT BIOLOGIQUE. A L'AIDE DES RESULTATS D'EXPERIENCES IN VITRO, LES ORGANISMES D'UNE COMMUNAUTE BENTHIQUE PEUVENT ETRE REGROUPES DANS 3 CATEGORIES EN FONCTION DE LEUR MODE DE BIOTURBATION: LES BIODIFFUSEURS, LES CONVOYEURS ET LES REGENERATEURS. LES MODELES EMPLOYES POUR QUANTIFIER LE REMANIEMENT SEDIMENTAIRE CONTIENNENT UN TERME DECRIVANT LE MELANGE BIODIFFUSIF ET UN AUTRE POUR LE MELANGE NON-LOCAL A L'ORIGINE D'UNE TRANSPORT VERTICAL DE MATIERE. LES EXPERIENCES IN SITU BASEES SUR L'INTRODUCTION PONCTUELLE DE TRACEURS; LUMINOPHORES ET/OU RADIONUCLEIDES, ONT PERMIS DE QUANTIFIER LE REMANIEMENT BIOLOGIQUE QUI EST GLOBALEMENT 10 FOIS PLUS ELEVE EN MILIEU LITTORAL QU'EN MILIEU PROFOND. EN MILIEU LITTORAL, LES FLUX DE SOLUTES SORTANT DU SEDIMENT SONT AUGMENTES D'UN FACTEUR ENTRE 1,5 ET 2 PAR L'ACTIVITE DU MACROBENTHOS. LA BIOTURBATION INTERVIENT AU NIVEAU DU STOCKAGE, DE LA TRANSFORMATION ET DE L'EXPORTATION DE LA MATIERE SEDIMENTAIRE. ELLE AUGMENTE LES POSSIBILITES D'ECHANGES DE MATERIEL SOLUBLE ET EST A L'ORIGINE D'IMPORTANTS FLUX PARTICULAIRES A TRAVERS L'INTERFACE EAU-SEDIMENT
Ecologie de cheminées hydrothermales actives by Pierre Chevaldonné( Book )

2 editions published in 1996 in French and held by 5 WorldCat member libraries worldwide

CETTE ETUDE FAIT LE POINT SUR LES CARACTERISTIQUES ECOLOGIQUES DE LA PARTIE LA PLUS CHAUDE DE L'ECOSYSTEME HYDROTHERMAL PROFOND. IL S'AGIT D'UN MILIEU COMPLEXE DANS SES DIMENSIONS SPATIALES ET TEMPORELLES. L'ENVIRONNEMENT PHYSICO-CHIMIQUE EST VARIABLE A DE MULTIPLES ECHELLES. AUX PHENOMENES TEMPORELS ALEATOIRES ET CHAOTIQUES SE SUPERPOSENT DES PHENOMENES PERIODIQUES DONT LES PLUS SIGNIFICATIFS SONT GOUVERNES PAR LES CYCLES DE MAREE. CETTE VARIABILITE PERMET AUX ORGANISMES PARTICULIEREMENT TOLERANTS DE COLONISER CE MILIEU DIFFICILE ET D'Y SUBSISTER. LES MICROORGANISMES SONT TRES ABONDANTS A LA SURFACE DES CHEMINEES, MAIS DIMINUENT TRES FORTEMENT DANS LES PREMIERS CM D'EPAISSEUR. ARCHAEA ET BACTERIA SONT DISTRIBUEES DIFFEREMENT. LA FAUNE DU POLE CHAUD EST DOMINEE A 13N/EPR PAR LES POLYCHETES ALVINELLIDAE, DONT LA BIOMASSE EST ELEVEE. LE RECRUTEMENT EST DISCONTINU, SANS DOUTE SYNCHRONE AU NIVEAU D'UN SITE OU D'UN CHAMP. LES ALVINELLIDAE SEMBLENT PRESENTER UN DEVELOPPEMENT NON-PLANCTOTROPHE EN CONTRADICTION AVEC LA DISTRIBUTION DES ESPECES. UN MODELE DE DISPERSION EST PROPOSE, QUI INDIQUE QUE LES COURANTS DE FOND SEULS NE PEUVENT EXPLIQUER CE PARADOXE. LE DEPLACEMENT DE L'ACTIVITE HYDROTHERMALE LE LONG DES DORSALES PERMET PEUT-ETRE, A LONG TERME, AUX ORGANISMES NE DISPOSANT PAS D'UNE PHASE DE DISPERSION TRES EFFICACE, DE COLONISER DE NOUVEAUX HABITATS DE PROCHE EN PROCHE
Influence de la bioturbation sur l'activité dénitrifiante dans les sédiments marins côtiers : effet d'un apport exogène de matière organique : les hydrocarbures by Franck Gilbert( Book )

2 editions published in 1994 in French and held by 4 WorldCat member libraries worldwide

L'OBJECTIF PRINCIPAL DE CE TRAVAIL ETAIT DE METTRE EN EVIDENCE L'INFLUENCE DE LA BIOTURBATION INDUITE PAR LE MACROBENTHOS SUR LA DENITRIFICATION DANS UN SEDIMENT MARIN SOUMIS A UN APPORT PONCTUEL MASSIF DE MATIERE ORGANIQUE (HYDROCARBURES). DEUX TYPES D'EXPERIMENTATIONS COMPLEMENTAIRES ONT ETE REALISEES: - IN VITRO, POUR ETUDIER LES EFFETS D'UNE POPULATION DE POLYCHETES GALERICOLES NEREIS DIVERSICOLOR, - IN SITU (GOLFE DE FOS) AFIN DE METTRE EN EVIDENCE L'INFLUENCE DE LA MACROFAUNE AUTOCHTONE PLURISPECIFIQUE DANS LES CONDITIONS NATURELLES. CES DEUX TYPES D'ETUDES ONT PERMIS DE DEMONTRER LE FORT IMPACT DE LA MACROFAUNE SUR LA DENITRIFICATION DANS LES SEDIMENTS, LA BIOTURBATION AYANT UNE INCIDENCE SUR: - LE NITRATE, DONT L'APPROVISIONNEMENT POUR LA DENITRIFICATION EST FACILITE LORS DU REMANIEMENT SEDIMENTAIRE, - LA PRESENCE D'OXYGENE, QUI A LA FOIS STIMULE LA NITRIFICATION POURVOYEUSE DE NITRATE ET INHIBE LA DENITRIFICATION, - LA MATIERE ORGANIQUE, DONT L'INFLUENCE EST VARIABLE EN FONCTION DES QUANTITES MISES EN CONTACT AVEC LA MICROFLORE DENITRIFIANTE, - LA CREATION DE MICRO-NICHES AUGMENTANT LA PROXIMITE ET LES ECHANGES ENTRE NITRIFICATION ET DENITRIFICATION
Influence de la bioturbation des macro-invertébrés benthiques sur le comportement biogéochimique de l'uranium au sein des sédiments d'eau douce by Sandra Lagauzère( Book )

3 editions published between 2008 and 2017 in French and held by 3 WorldCat member libraries worldwide

In freshwater ecosystems, sediments act as an accumulation compartment for metallic pollutants as uranium. Secondary, there can also represent endogenous sources of contamination by resuspension (e.g. flood, bioturbation) or changes of metal speciation that acts upon their bioavailability. Indeed, metallic compounds can be transformed in more or less toxic or inert compounds through physico-chemical (e.g. pH, redox conditions, ionic force) and microbiological variations. These conditions are themselves under the effects of benthic macro-invertebrate activities via bioturbation processes. The main objective of this PhD was to determinate the influence of two benthic macroinvertebrate species (Chironomus riparius and Tubifex tubifex) on the distribution and the transfers of uranium within freshwater sediments. To reach this goal, laboratory experiments were performed in order to (i) assess the effects of uranium on benthic macroinvertebrates, more particularly on their bioturbation activity, (ii) determine the influence of these organisms on uranium behaviour through high resolution physico-chemical measurements (e.g. oxygen optodes, DET gel probes), and (iii) estimate the consequences of these interactions on pelagic organisms via genotoxicity measurements (micronuclei assay and molecular biomarkers analysis on Xenopus laevis). The results demonstrate that bioturbation intensity of macroinvertebrates can be affected in uranium-contaminated sediments, but the two species studied in this work show a relative tolerance. For high uranium concentrations (>100 times the geochemical background level), corresponding however to realistic concentrations in highly contaminated sites, T. tubifex worms are able to maintain a sufficient bioturbation activity that induces a high remobilization of uranium initially associated with sediments to the overlying water (factor 2 to 10). That represents therefore a potential risk for the remaining aquatic biocenosis. However, by testing this assumption on X. laevis, it was surprisingly noticed that the worms' behaviour can be modified in presence of this organism in the water column. The effect of bioturbation on uranium release from the sediments was thus altered conducing to lower uranium concentrations in the water column. Nevertheless, sediment-associated uranium, without the effect of bioturbation, induces negative effects on this pelagic organism. Finally, this PhD work illustrates the interactions that can exist between aquatic organisms, sediment biogeochemistry and a metallic pollutant as uranium. The novel results obtained permit to view more precisely the consequences of uranium pollution in aquatic environment. More globally, this work will contribute to a better assessment of ecological risks in polluted aquatic ecosystems
Recherches de bionomie descriptive et expérimentale (in vivo et in vitro) dans quelques biotopes littoraux soumis à des variations naturelles ou artificielles des conditions du milieu (notamment dans l'étang de Berre et le golfe de Fos) by Georges Stora( Book )

1 edition published in 1982 in French and held by 3 WorldCat member libraries worldwide

CONDITIONS DU MILIEU. MISE EN EVIDENCE DE L'EVOLUTION BIONOMIQUE D'ECOSYSTEMES LITTORAUX SOUMIS A UN GRADIENT CROISSANT DE PERTURBATION. EVOLUTION A LONG TERME DES PEUPLEMENTS BENTHIQUES DU GOLFE DE FOS ET DE L'ETANG DE BERRE. MISE EN EVIDENCE DE L'ACTION PREPONDERANTE DES DIFFERENTS FACTEURS ALTERAGENES. ETUDE DE LA DYNAMIQUE A MOYEN TERME DES PEUPLEMENTS LEE ET SVMC DE L'ETANG DE BERRE ET DU CANAL DE CARONTE. ETUDE EXPERIMENTALE IN SITU DE LA COLONISATION DE SUBSTRATS DEPEUPLES. ETUDE ECOTOXICOLOGIQUE IN VITRO
MISE AU POINT D'UN NOUVEAU MODELE DE BIOTURBATION POUR UNE APPROCHE FONCTIONNELLE DU REMANIEMENT SEDIMENTAIRE LIE A L'ACTIVITE DES COMMUNAUTES MACROBENTHIQUES by Frédérique François( Book )

2 editions published between 1999 and 2006 in French and held by 2 WorldCat member libraries worldwide

L'objectif de cette these est de developper un modele permettant de caracteriser, quantifier et predire le remaniement sedimentaire resultant de l'activite des communautes macrobenthiques. Le modele elabore est un modele mecaniste de melange des particules base sur une approche fonctionnelle des differents individus qui constituent la communaute. Il est dependant du temps et de l'espace et utilise des equations differentielles ordinaires. Sa formulation repose sur cinq modeles elementaires de remaniement sedimentaire. Quatre d'entre eux ont ete mis au point a partir de types fonctionnels decrits dans la litterature. Ce sont les modeles des biodiffuseurs, des convoyeurs vers le haut, des convoyeurs vers le bas et des regenerateurs. Un cinquieme modele, celui des diffuseurs a galeries, a ete elabore pour caracteriser et quantifier le remaniement sedimentaire lie aux organismes qui creusent des galeries, comme le polychete nereis diversicolor. Ces modeles prennent en compte la taille de la zone remaniee par l'individu, le type et l'intensite du processus de bioturbation, le depart vers la colonne d'eau et le taux de degradation du traceur ainsi que le melange physique du sediment sous l'action des courants d'eau locaux. Ils permettent (1) de caracteriser et de quantifier le processus de melange des differents organismes macrobenthiques, (2) de calculer a chaque instant la distribution en deux dimensions d'un traceur dans un sediment soumis au processus de melange d'un de ces organismes, et (3) de mettre en evidence la variabilite specifique a l'interieur des groupes fonctionnels. Ces modeles entrent egalement dans la formulation d'un modele global de bioturbation permettant d'etudier, de quantifier et de predire le remaniement sedimentaire lie aux differentes communautes macrobenthiques en fonction de leurs caracteristiques (diversite specifique, composition et richesse fonctionnelle, especes cles etc.)
Food supply impacts sediment reworking by Nereis diversicolor by Géraldine Nogaro( )

1 edition published in 2007 in English and held by 2 WorldCat member libraries worldwide

Rôle de la diversité fonctionnelle de la communauté à Macoma balthica (estuaire du Saint-Laurent, Québec, Canada) sur les flux biogéochimiques à l'interface eau-sédiment et sur le mélange particulaire by Emma Michaud( Book )

2 editions published in 2006 in French and held by 2 WorldCat member libraries worldwide

The objective of this Ph.D. thesis is to characterise and quantify the effects of the dominant functional groups of the Macoma balthica community, maintained separately and in various combinations, on: i) biogeochemical fluxes at the sediment-water interface (oxygen, dissolved organic carbon, ammonium, nitrate, phosphate), ii) sediment mixing, and iii) bacterial communities. The functional groups of the M. balthica community of the St Lawrence estuary (Quebec, Canada) were defined according their sediment mixing mode: two biodiffusers (M. balthica and Mya arenaria) and one gallery-diffuser (Nereis virens) were studied. Experiments were performed in replicated microcosms with the functional groups being either isolated (allopatry) and combined (sympatry); control microcosms contained sediment but no macrofauna. All treatments were subjected to identical experimental conditions over the duration of the experiment (40 days). Microcosms contained similar biovolumes of organisms, these volumes being determined from natural densities. The space occupied by macro-invertebrates was thus similar in all treatments. The results clearly show that the biodiffusers and the gallery-diffuser, at similar biovolumes, have different effects on the stimulation of biogeochemical fluxes, on particle transport towards deeper layers, and on bacterial activity. The effects of the gallery-diffuser are highest and vary over time, due to the spatio-temporal dynamic of biogenic structures and irrigation activities, and to different maximal burrowing depths. The different burrowing depths of the two biodiffusers also explain the observed intra-functional variation in nitrate and ammonium fluxes, and in bacterial activity. The combination of both functional groups (gallery-diffuser+biodiffusers) has important effects on measured parameters, the latter often being higher than would be predicted based on additive effects. Positive spatial interactions between the two functional groups explain these effects. The interactions between functional groups, which essentially act on nitrate, phosphate, ammonium and oxygen fluxes, suggest that, at similar biovolumes, the burrowing depth of each functional group and the spatial organisation of these groups are key factors in the stimulation of sedimentary biogeochemical processes. The results obtained are directly comparable due to the use of similar biovolumes, and thus validate the functional approach for the study of bioturbation and its effects on biogeochemical fluxes, sediment mixing and bacterial communities. Further research is proposed to (i) develop the functional approach for studies based only on solute exchange at the sediment-water interface, (ii) refine the notion of biovolume, and (iii) examine in more detail the effects of relationships between functional groups within a benthic community on coastal sediment functioning
Quantification de la bioturbation dans les écosystèmes marins côtiers : caractérisation des groupes fonctionnels responsables du remaniement sédimentaire by Eric Marc Yann Duport( Book )

2 editions published in 2006 in French and held by 2 WorldCat member libraries worldwide

In order to define the biological and environmental factors playing a role in the sediment reworking intensity changes, works have been carried out both on monospecific Nereis diversicolor population (in vitro) and in situ macrobenthic communities. The studies about in situ communities were realised over time in contrasted Mediterranean environments : St. Antoine canal (Gulf of Fos) and Thau Lagoon. The first part of this work was to characterize the species and more particularly their belonging bioturbation functional group according to their tropic and locomotive behaviors. In the second part, using particle tracers (luminophores), intensity of sediment reworking induced by organisms was quantified. The impact of the different studied factors on sediment reworking intensity was assessed with 1-D model. The results of the in vitro experiment showed the existence of a non-linear relationship between density of gallery-diffusor N. diversicolor and sediment reworking intensity. The intensity of biodiffusive transport (Db) and the biotransport (r) first increased with the density and then reached a maximal value. This experimentation showed the importance of the population density which appears as a key factor in the sedimentary ecosystem functioning.The studies related to in situ communities allowed to highlight the crucial importance of the species functional traits and the functional diversity of the communities on the sediment mixing dynamics. This work has enabled us to show that temporal changes in sediment reworking are a complex phenomenon which can be explain by combined influence of biological factors (functional composition and density of the community), associated with the direct and indirect influence of environmental (temperature of water, oxygen concentration in the sediments, organic quantity of matter in the sedimentary column and particle size)
Hydrocarbon influence on denitrification in bioturbated Mediterranean coastal sediments by Franck Gilbert( )

1 edition published in 1997 in English and held by 2 WorldCat member libraries worldwide

Effect of bioturbation on denitrification in a marine sediment from the West Mediterranean littoral by Franck Gilbert( )

1 edition published in 1995 in English and held by 2 WorldCat member libraries worldwide

Contribution à l'étude de la notion de concentration léthale limite moyenne (CL 50) appliquée à des invertébrés marins by Georges Stora( Book )

1 edition published in 1972 in French and held by 2 WorldCat member libraries worldwide

Accent on solos book 3 by Georges Stora( Book )

1 edition published in 2006 in English and held by 1 WorldCat member library worldwide

 
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Global change : mankind-marine environment interactions : proceedings of the 13th French-Japanese Oceanograph Symposium
Covers
Accent on solos book 3
Languages
French (17)

English (17)