Dissertations / Theses on the topic 'Lagune'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Lagune.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Daoudi, Mouna. "Peuplements phytoplanctoniques, risques toxiques et qualité de l'eau de deux lagunes méditerranéennes : lagune de Nador (Maroc) et lagune de Canet-St-Nazaire (France)." Perpignan, 2011. http://www.theses.fr/2011PERP1091.
Full textAmri, Elhassane. "La lagune de Khnifiss (littoral Atlantique du Sahara marocain) : analyse d'un écosystème original." Paris 7, 1998. http://www.theses.fr/1998PA077005.
Full textTorreton, Jean-Pascal. "Importance des bactéries hétérotrophes aérobies dans une lagune tropicale (Lagune Ebrié, Côte d'Ivoire) : biomasse,production, exportations." Aix-Marseille 2, 1991. http://www.theses.fr/1991AIX22027.
Full textMhamdi, Alaoui Asmae. "Environnement et paléoenvironnement d'un écosystème côtier : la lagune de Moulay Bousselham, côte atlantique marocaine." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13967.
Full text[Abstract not provided]
Pagano, Marc, and Lucien Saint-Jean. "Importance et rôle du zooplancton dans une lagune tropicale, la lagune Ebrie (Côte d'Ivoire) : peuplements, biomasse, production et bilan métabolique." Aix-Marseille 2, 1988. http://www.theses.fr/1988AIX22050.
Full textPagano, Marc Saint-Jean Lucien. "Importance et rôle du zooplancton dans une lagune tropicale, la lagune Ebrie (Côte d'Ivoire) peuplement, biomasse, production et bilan métabolique /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37617271b.
Full textKouassi, Ernest. "Rythmes journaliers d'activité et sélectivité alimentaire au sein des communautés pélagiques : (Zooplancton et Mysidaces) dans une lagune tropicale (Lagune Ebrie, Côte d'Ivoire)." Aix-Marseille 2, 2001. http://www.theses.fr/2001AIX22021.
Full textDavid, Marine. "Influence des apports d'eaux souterraines sur le fonctionnement hydrologique et biogéochimique des lagunes méditerranéennes : cas de la lagune de l'Or." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTG039.
Full textAt the interface between the continent and the sea, Mediterranean lagoons are vulnerable to excessive nutrient inputs from anthropogenic activities, causing eutrophication of the water bodies. Even management actions have been implemented on the watershed to reduce nutrient fluxes to the coastal zone, some lagoons remain in a bad ecological status according to the Water Frame Directive, highlighting the need for improving our understanding of the land-sea continuum. On the Mediterranean coast, little is known on groundwater inputs, their associated nutrient fluxes and their impact on lagoons in a bad ecological status. The aim of this PhD thesis was to improve our understanding of two main hydrological processes associated with groundwater: 1) continental groundwater inputs, as a new nutrient source to the lagoon from the adjacent aquifers and 2) pore water recirculation, driving nutrient from sediments to the water column through advective water flow, as a regenerated nutrient source. Or lagoon, whose bad ecological status has not improved over the last decade despite management actions, was chosen as a study site. Investigations the watershed revealed that important loads of nitrogen, originating from continental groundwater, was discharged to the lagoon through the streams. Experiments on lagoon sediments suggested that the muddy characteristics of Or lagoon induced low pore water recirculation fluxes. Hence, the majority of groundwater inputs to Or lagoon occurs through the streams from the continental aquifer. An annual nutrient budget enabled to conclude that given the importance of two main contributors (canalette and Rhône to Sète canal), groundwater inputs are not the major nutrient source to Or lagoon. The work carried out in this lagoon in a bad ecological status contributes to improving our understanding of nutrient fluxes on the land-sea continuum, in order to prioritize actions to be implemented to reach a good ecological status on Mediterranean lagoons
Polet, Jean. "Archéologie des îles du pays Eotilé (lagune Aby, Côte d'Ivoire)." Paris 1, 1988. http://www.theses.fr/1988PA010676.
Full textPolet, Jean. "Archéologie des îles du pays Eotile (Lagune Aby, Côte d'Ivoire)." Lille 3 : ANRT, 1989. http://catalogue.bnf.fr/ark:/12148/cb376175955.
Full textManca, Laura. "Ruolo ecologico di Ficopomatus enigmaticus (Polychaetae: Serpulidae) nelle lagune dell’Oristanese." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/4558/.
Full textRossi, Alessandra. "Mappatura degli habitat bentonici delle aree di Burano e Torcello, con particolare attenzione alla componente macroalgale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13385/.
Full textGalano, Lucie. "Montpellier et sa lagune : histoire sociale et culturelle d'un milieu naturel (XIe-XVe)." Thesis, Montpellier 3, 2017. http://www.theses.fr/2017MON30005/document.
Full textMy studies are on the management of the Bas Languedoc’s lagoon during the Middle Ages and particularly the interaction between the town of Montpellier and its hinterland. My research shows the many jurisdictions of the waters and shores and how the overlords share the rights related to the management of this area. I also study the conditions of the operation of the ponds (fishing, hunting, salt farming and navigation)
Irzi, Zoulikha. "Etude sédimentologique et micropaléontologique de la lagune de Nador (Maroc oriental)." Paris 6, 1987. http://www.theses.fr/1987PA066697.
Full textMoller, Jr Osmar Olinto. "Hydrodynamique de la lagune dos Patos (30oS, Brésil) : mesures et modélisation." Bordeaux 1, 1996. http://www.theses.fr/1996BOR10521.
Full textIrzi, Zoulikha. "Etude sédimentologique et micropaléontologique de la lagune de Nador, Maroc oriental." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37606084p.
Full textLagarde, Franck. "Écologie de la reproduction de l'huître Crassostrea gigas en lagune méditerranéenne." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS470.
Full textThe Mediterranean lagoons host many anthropogenic uses including shellfish aquaculture since the beginning of the 20th century. Imported in 1970, the cupped oyster, Crassostrea gigas, has adapted perfectly and has allowed an important development of oyster’s industry until 2008, the year of occurrence of spat outbreak related to the emergence of an Ostreid Herpes-virus µvar. The scarcity of spat and the speculation on this product changed regionally cultural practices and the supply of juveniles, with in particular the wish of developing a local activity of spat collection. However the cycle of reproduction of the species and the recruitment of juveniles were poorly known in lagoon environments. In this context, the objective of this thesis is to characterize the variability of the reproduction and the recruitment of the cupped oyster in Mediterranean lagoon. The lagoon configuration offers the advantages of productivity for the broodstock and hydrodynamic connectivity for the larvae. However, it appears that the ecological functioning of the system at the base of the primary production plays an essential role on the trophic resources for the success of oyster reproduction. This work takes place in the context of the ecological restoration under oligotrophication, which first effects we describe on the oyster's reproductive cycle
Bellavance, Martine. "Biodégradation des acides gras et résiniques dans la lagune aérée d'une papeterie." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0026/MQ37776.pdf.
Full textBellavance, Martine. "Biodégradation des acides gras et résiniques dans la lagune aérée d'une papeterie /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1998. http://theses.uqac.ca.
Full textSromek, Ludmila Katarzyna. "Phylogéographie et génomique des populations de la coque de lagune Cerastoderma glaucum." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4105.
Full textPrevious studies found a high level of genetic structuring among the European populations of the lagoon cockle Cerastoderma glaucum. However, the geographic locations of the major genetic divisions differed among markers and the small number of genetic markers used lacked the power to test for gene flow between divergent clusters. Therefore, the main aim of this thesis was to assess the population structure of C. glaucum using new genetic markers in the light of the respective role of past divergence and habitat fragmentation. To reach these objectives, populations from the Atlantic and Mediterranean coasts have been investigated using: i) classical genetic markers (EPIC together with previously published microsatellites); ii) restriction-site associated DNA sequencing (RADseq). When the classical genetic markers revealed the divergent character of Eastern Mediterranean populations, the RADseq approach allowed inferring phylogenetic relationships with an unprecedented resolution. Three deeply divergent lineages were described within C. glaucum: one in the Aegean-Black Sea region, one in the Ionian Sea, and the last one widely distributed from the Western Mediterranean to the Baltic Sea. This last lineage underwent further diversification with isolated entities detected in Western Mediterranean, Atlantic, North Sea and Baltic Sea. Compared to the sister species C. edule, which thrives in a less fragmented habitat, C. glaucum displayed a much stronger genetic differentiation among populations. Consequently, it seems that genetic incompatibilities, which emerged as a by-product of geographic isolation together with local adaptation, led to the origin of a species complex. These results highlight the evolutionary role of lagoon habitats, where genetic diversification can proceed very quickly
BUTTU, SIMONE. "Impatto del cormorano Phalacrocorax Carbo Sinensis sulle produzioni ittiche delle lagune sarde." Doctoral thesis, Università degli Studi di Cagliari, 2015. http://hdl.handle.net/11584/266568.
Full textDirgantara, Gan Gan. "Caractérisation systémique du bassin versant de Citanduy appliquée à la gestion intégrée et à la préservation de la lagune Segara Anakan (Indonésie)." Thesis, Montpellier 3, 2011. http://www.theses.fr/2011MON30022/document.
Full textThe coastal zone is very important for Indonesia. It becomes the significant basis for the domestic, commercial and industrial activities. Recently, many environmental problems have arisen in the coastal zone development in this country. One of them is the case of the Segara Anakan mangrove lagoon, located in the Citanduy watershed on the Java Island. The high level of sedimentation, resulting from rapid soil erosion in the upstream of that watershed has caused a severe degradation of the economical and ecological functions of that lagoon. Between 1903 and 2008, the lagoon area decreased by 88% from 6400 to 750 hectares. By taking into account the uniqueness and its important functions, the Indonesian government has determined the Segara Anakan lagoon as a national strategic area where the conservation efforts have been initiated. However, the environmental degradation of that lagoon still occurs until now because of the management problem which is maintained by multiple conflicts between the various actors of regional development. Considering the watershed, including the lagoon area, as a dynamic and complex system, we used the DPSIR method (Driving force-Pressure-State-Impact-Response) to analyze and to link all the factors involved in the degradation of this ecosystem including physical, economic, social, political and institutional aspects. The identification of these factors and the description of their interrelationships are essential to develop an integrated lagoon management model which is accepted by the different actors concerned in the lagoon management and the lagoon utilization
Chevillon, Christophe. "Biosédimentologie du grand lagon nord de la Nouvelle-Calédonie /." Paris : Ed. ORSTOM, 1992. http://catalogue.bnf.fr/ark:/12148/cb35535477f.
Full textJoyeux, Jean-Claude. "Biologie des populations de Gobius niger Linne, 1758 Pomatoschistus minutus (Pallas, 1770) et Pomatoschistus microps (Kr0yer, 1838)(Teleostei, Gobidae) dans une lagune Nord-Méditerraneenne, la lagune de Mauguio - France." Perpignan, 1991. http://www.theses.fr/1991PERP0107.
Full textMarin, E. Baumar J. "Transport et recrutement du muge argenté, Mugil curema, dans une lagune côtière tropicale." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25249.pdf.
Full textBloundi, Mohamed Karim. "Etude géochimique de la lagune de Nador (Maroc oriental) : Impacts des facteurs anthropiques." Université Louis Pasteur (Strasbourg) (1971-2008), 2005. https://publication-theses.unistra.fr/public/theses_doctorat/2005/BLOUNDI_Mohamed_Karim_2005.pdf.
Full textThe lagoon of Nador, located at the north-eastern coast of Morocco, is an ecosystem of biological, ecological, and economical interest. Today, the contamination by organic and inorganic pollutants increases because of the population growth as well as industrial and agricultural increase of urban wastes. The aim of this work is to carry out a detailed geochemical study in order to specify the anthropogenic impact on the inequality of the studied ecosystem. The pollutants were studied in the following fields: (i) sediments, (ii) waters, (iii), suspended matters, and (iv) interstitial waters. The first enrichment appearance of heavy metals (HM) in the sediments of the lagoon is more concentrated near the old mineral treatment factory. In addition to the HM, the sediments of the lagoon contain a new organic contamination which is characterized by an accumulation of organic carbon and sulphur. The molecular analysis of the organic matter reveals that certain sectors of the lagoon are contaminated by hydrocarbons and faecal pollution in the vicinity of the towns Beni-Enzar, Arekman as well as close to the river Bouaroug. The water in the lagoon is generally richer in phosphorus than nitrogen which is indicative of anthropogenic influences. However, the contents in HM are lower than normally. The efficiency of the purification plant of Nador (STEP) is acceptable for the suspension matter and pH, and less good for the phosphorus, dissolved oxygen and HM. The chemical variations of the interstitial water indicate the presence of reduced micro-environments which are rich in ammonium, poor in sulphates, not very charged in dissolved oxygen and where sulphate reduction is active. The analysis of the HM in the suspended matter indicates that they are concentrated at the level of the STEP exit and in the vicinity of the old iron ore works. Our results enable the mapping of highly endangered zones, where for example changes in conditions resulted in a reduced biodiversity and a modified structure of the carapaces of the ostracods (Ruiz et al. , 2005)
Mathieu, Christian. "Inselstadt Venedig : Umweltgeschichte eines Mythos in der Frühen Neuzeit /." Köln : Böhlau, 2007. http://catalogue.bnf.fr/ark:/12148/cb41085547h.
Full textBibliogr. p. 247-292.
Sakho, Issa. "Évolution et fonctionnement hydro-sédimentaire de la lagune de la Somone, Petite Côte, Sénégal." Phd thesis, Université de Rouen, 2011. http://tel.archives-ouvertes.fr/tel-00680519.
Full textPlus, Martin. "Étude et modélisation des populations de macrophytes dans la lagune de Thau (Hérault, France)." Paris 6, 2001. http://www.theses.fr/2001PA066562.
Full textPolsenaere, Pierre. "Echanges de CO2 atmosphérique dans la lagune d’Arcachon et relations avec le métabolisme intertidal." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14253/document.
Full textThe coastal zone is only taken into account since recently in global carbon budgeting efforts. Although covering globally modest surface areas, carbon and nutrient fluxes in the coastal zone appear significant at the global scale. However, little is known about the CO2 behaviour in lagoons and even less in intertidal zones where exchanges with the atmosphere occur alternatively with the water and the sediment. The purposes of this work are, on one hand, to establish the carbon budget between the Arcachon lagoon, the atmosphere and the terrestrial watershed and on the other hand, to link these fluxes with the net ecosystem production (NEP) and better characterize its metabolic status along with the relevant environmental factors. For the first time, CO2 flux measurements by Eddy Correlation have been carried out at different seasons and stations in the tidal flat. In parallel, the total terrestrial carbon export from river waters has been quantified throughout a complete hydrological cycle in nine watercourses flowing into the lagoon. The total carbon export from the watershed through surface river waters is estimated at 116 t C km-2 yr-1 on which 39% is exported to the lagoon as dissolved organic carbon (DOC) owing to the predominance of podzols in the watershed. Intense organic matter mineralization in soils and groundwaters largely over-saturate river waters in CO2 on which export accounts for 21% as dissolved inorganic carbon (DIC). The mathematical “StreamCO2-DEGAS” model formulation based on water pCO2, DIC concentrations and isotopic composition measurements permits to show that 43% of the total carbon export was degassed as CO2 from the riverine surface waters to the atmosphere, lowering then this latter to 66 t C km-2 yr-1. With respect to the CO2 flux measurements in the lagoon, cospectral analysis and the well accordance of results with physical and biological controls at the tidal, diurnal and seasonal time scales permit to validate the Eddy Correlation technique over tidal coastal zone. CO2 fluxes with the atmosphere, during each period, were generally weak and ranged between -13 and 19 µmol m-2 s-1. Low tide and daytime conditions were always characterized by an uptake of atmospheric CO2. In contrast, during the immersion and during low tide at night, CO2 fluxes where either positive or negative, or close to zero, depending on the season and the site. The concomitant analysis of CO2 fluxes with satellite images of the lagoon at low tide during the day clearly discriminate the relative importance of the two distinct metabolic carbon cycling involving the main primary producers, i.e. (1) the Zostera noltii seagrass meadow predominance on the NEP in autumn and summer in the more central station, with an annual cycling and (2) the microphytobenthos community predominance on the gross primary production (GPP) in spring at the same station and in autumn in the inner part of the bay where a rapid carbon cycling during the immersion and the emersion was clearly highlighted. The different results obtained with the Eddy Correlation technique over tidal flats opens interesting perspectives on the knowledge of the carbon budget and the biogeochemical and ecological processes within the coastal zone
Sakho, Issa. "Evolution et fonctionnement hydro-sédimentaire de la lagune de la Somone, Petite Côte, Sénégal." Rouen, 2011. http://www.theses.fr/2011ROUES036.
Full textLocated at the Petite Côte of Senegal, Somone is a small coastal river that flows into the Atlantic Ocean by a microtidal lagoonal-estuarine ecosystem. Today, the contribution of the watershed is absent due to a combination of several factors including the dam of Bandia. The only freshwater inputs are from precipitation and groundwater. Somone is a lagoonal-estuarine system characterized by an inverse hydrological functioning where marine influences predominate. Mangrove, dominated by Rhizophora, is the main characteristic unit of this coastal system. The diachronic evolution of 60 years shows a significant change for all the morphological units of the ecosystem. The mobility of the sandy spit, which caused the closures of the mouth in 1967-1969 and in 1987, is related to meteorological variations. The regressive surface of mangroves between 1954 and 1989 is the result of the combined effect of these closures of the mouth, drought and traditional uses of mangroves. The restoration of the mangrove is mainly due to reforestation policies administered in the 2000s. The annual and seasonal trend shows that the internal reworking is the main hydro-sedimentary processes. Sedimentation rate of the mud flats is 2 to 3 mm. Year-1. The dynamics of the sandy spit of the Somone plays an important role in the development and quality of internal units, the mangroves in particular. The permanent opening of the mouth allows a twice-daily renewal of water in the lagoon, which is essential for regulating the high salt content. The low content of sediment in total organic carbon, reflect the low organic matter production of the mangrove because it is a young and stunted mangrove. Diagenetic processes are anaerobic and mostly in the top 10 cm of the sediment, on the recent deposit. The contribution of young mangroves, like Somone, in the carbon storage process, is low. The lagoonal-estuarine ecosystem of the Somone is fragile and highly reactive and his evolution is fast and linked to the cumulative effects of natural and anthropogenic factors
Andrianjakarivony, Felana Harilanto. "Caractérisation du virome d’un écosystème tropical fortement anthropisé : la lagune Ebrié en Côte d’Ivoire." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0579.
Full textIn this thesis, we chose to study the viral community in a tropical lagoon exposed to domestic, agricultural and industrial discharge : the Ébrié Lagoon bordering the city of Abidjan in the Ivory Coast. The objectives of this study were (1) to characterize the benthic and planktonic viromes in seven sites in the lagoon with contrasting levels of eutrophication, distinguishing between DNA and RNA viromes, and (2) to examine the reproductive strategies of viruses. To this end, we used shotgun metagenomic sequencing combined with bioinformatics analysis. The key findings showed that the composition of DNA viromes was specific to each compartment (plankton/benthos). Conversely, the composition of RNA viromes was more influenced by the level of eutrophication than by the compartment. Viromes of the most eutrophicated sites contained sequences associated with human pathogens of faecal origin and with indicators of human faecal pollution. The study of interactions between the viruses and their bacterial hosts showed that the most eutrophic sites in this tropical lagoon were more conducive to lytic viral reproductive strategies, while lysogeny was more common in the most oligotrophic sites. Lastly, the results of an approach based on the theoretical prediction of bacterial hosts via the Prokaryotic virus Host Predictor indicated the reliability of this tool in generating taxonomic profiles of bacterial hosts comparable to those obtained by the classical approach based on metabarcoding targeting the 16S rRNA gene. This study provided not only a unique dataset, but new fundamental knowledge on the composition of the virome of aquatic sites subjected to high levels of pollution
Catenacci, Elena. "Mappatura degli habitat bentonici dell'area nord-est di Venezia, con particolare attenzione alla componente macroalgale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textDhib, Amel. "Contribution à l'étude des successions écologiques du phytoplancton dans la lagune de Ghar El Melh." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2033/document.
Full textWe explored the distribution of the microphytoplankton community in relation to both abiotic (temperature, salinity and nutrients) and biotic factors (epiphytes microalgae, dinoflagellate cysts, ultraplankton and ciliates) in Ghar al Melh Lagoon at 5 stations during (i) a biweekly sampling from January 2011 to January 2012 and (ii) a seasonal sampling from november 2012 to march 2013. The results pointed out a seasonal variation of all parameters with high water temperature and salinity in summer and exceptional concentrations of nutrients in autumn and winter. Microphytoplankton was mainly dominated by dinoflagellates and diatoms with sequences of harmful species proliferation attaining more than 70 % of total phytoplankton. These sporadic proliferations occurred throughout the year with exacerbation in the inner parts of the lagoon mainly related to temperature and total nitrogen, nitrogen and orthophosphate. An important contribution of epiphytic species to phytoplankton abundance was recorded with especially the presence of the toxic dinoflagellate Prorocentrum lima. Microphytoplankton was dominated by Prorocentrum micans (> 28 %) and other non-cyst former species consistent with the low dinoflagellate cysts found at sediment surface (maximum = 229 cysts g-1 DS). Urtraplankton was chiefly represented by nanophytoplankton and heterotrophic prokaryotes, with low microphytoplanktonic abundance. This indicates that the lagoon is undergoing eutrophication. Significant correlations were reported between phytoplankton and microzooplankton suggesting a potential role of the former in controlling harmful microalgae proliferations
Abadie, Eric. "Etude de Vulcanodinium rugosum (Dinoflagellé producteur de pinnatoxines) se développant dans la lagune méditerranéennede l’Ingril." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS188/document.
Full textHarmful and / or toxic phytoplankton blooms impact for a long time marine ecosystems worldwide. These massive developments have an adverse effect on ecosystems and their exploitation. The lagoons of the region Languedoc-Roussillon are affected for decades. In addition to recurring health risks from Dinophysis (DSP toxins) and Alexandrium (PSP toxins), Vulcanodinium rugosum was identified in 2011 in the lagoon Ingril. This new species product pinnatoxins (neurotoxins). Through this thesis work, the biology of this new species (life cycle, growth condition, toxin production), its shellfish contamination capacity and geographic distribution in neighboring lagoons were studied on cultures in the laboratory and via environmental monitoring.The results of this study have demonstrated its thermophilic and euryhaline features (optimum salinity and temperature of 25°C and 40 respectively) and its growth ranges between 20 and 30°C. Its ability to grow on an organic nitrogen source (urea) has been showed in vitro. Its expansion in other lagoons of Languedoc-Roussillon, was confirmed by the contamination of the mussels by the pinnatoxin G. The survival of this organism in the digestive tract of mussels and oysters proves that the transfer of shellfish is potentially a source of contamination of new ecosystems not yet affected by this toxic species.The life cycle of V. rugosum has not been fully described because the resistance cyst has not been formally identified. Temporary cysts appear as very important stages to be considered because of their ability to divide and their strong presence on macrophytes. These temporary forms of resistance may be a significant source of contamination of shellfish in the lagoon of the Ingril even when the vegetative cells of V. rugosum are weakly present in the water column. Because of the low densities of V. rugosum in situ and the difficulty of its identification on morphological criteria, the monitoring within the REPHY protocol remains difficult. Thus the use of passive sampling systems (Spatt) made with resins which adsorb toxins dissolved in water would make possible the early detection of toxins associated with these emerging benthic species. This study highlights the growth of an emerging thermophilic species that might with others and thanks to climate change provide important health and economic problems in vulnerable lagoon ecosystems of the Mediterranean
Thimel, Anne. "Etude in situ du métabolisme aérobie d'une communauté benthique dans une lagune mixohaline peu profonde." Bordeaux 1, 1988. http://www.theses.fr/1988BOR10593.
Full textN'Goran, Ya Nestor. "Biologie, écologie et pêche de l'ethmalose : Ethmalosa Fimbriata (Bodwich, 1825) en lagune Aby (Côte d'ivoire)." Brest, 1995. http://www.theses.fr/1995BRES2001.
Full textThimel, Anne. "Etude in situ du métabolisme aérobie d'une communauté benthique dans une lagune mixohaline peu profonde." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37618891v.
Full textYahyaoui, Ahlem. "Conflits d'usage environnementaux sur les rives de la lagune de Bizerte (Tunisie) : une mise en perspective méditerranéenne." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0706/document.
Full textThe dissertation seeks to recognize the socio-spatial meanings of dynamic conflicts related to the environment in the lagoon and to assess its effects in terms of environmental governance as well. The analysis concentrates on the reasons and the genesis of the actors’ oppositions at work around the lagoon of Bizerte (Tunisia) and the pond of Berre (Marseille). Putting the light on these conflicts represents an issue for the integrated wetland management. This topic has been tackled on by other researchers. However, it remains a major interest due to the knowledge and the originality of the territory. Particularly, the thesis raises the question of the potential impacts that conflicts can have on organizations and institutions in place. In fact, is it possible that public action will be renewed to follow the emergence or conflicts regulation? This question is tied to the challenges of the current and major companies and to an extreme rapidity of territory changing: Bizerte’s lagoon is situated on the southern shore of the Mediterranean and in a country where the regime is in continuous transition. This research covers the ground to study the potential emergence of the participative approach and the social integration of environmental issues in coastal, urban and rural territory
Vianello, Rita. "Le savoir des mytiliculteurs de la lagune de Venise et du littoral breton : étude d'anthropologie comparative." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0025/document.
Full textFrom a geographic perspective, the Venice Lagoon has almost nothing in common with the main northern bays of “Bretagne”; simply, both open on the sea. Therefore, the two studied realities have to share their submission to the action of tides that have pushed the coastal communities to develop fishing knowledge and techniques. They were able to evolve over time to better suit the characteristics of the environment. The different forms of harvesting and fishing, mussel farming in particular, led to domestication and human impacts in these areas. In “Bretagne”, as in Venice, is rather late the development of mussels as food and as economic resource.Whether in the literature sources or during the survey in the field, our research has led us to identify frequent allusions to the alleged toxicity of this mollusk in Venice called “peòcio” that mean “cootie” and considered inedible. What mechanisms have metamorphosed mussels into a regarded and sought food today? And how formerly very poor areas are transformed into places renowned for the production of mussels? It is to answer these questions that we undertook the reconstruction of the history of the mussel
Da un punto di vista geografico la laguna di Venezia ha poco in comune con la Bretagna settentrionale se non il suo sbocco sul mare. Di conseguenza le due realtà condividono la dipendenza dall’azione delle maree, le quali hanno spinto le popolazioni litoranee a sviluppare dei saperi e delle particolari tecniche di pesca adattate alle caratteristiche dell’ambiente.Nel corso della nostra ricerca abbiamo incontrato delle frequenti allusioni alla presunta tossicità del mitilo, a Venezia chiamato “peòcio”, cioè pidocchio. Infatti a Venezia, come in Bretagna, la valorizzazione dei mitili quale risorsa alimentare ed economica è un fenomeno tardivo. Quali meccanismi hanno trasformato i mitili in un alimento che è oggi apprezzato e ricercato? E in che modo delle zone un tempo molto povere si sono trasformate in località rinomate per la produzione di questi molluschi? Per rispondere a queste domande abbiamo ricostruito la storia della mitilicoltura
Colleuil, Bernard. "Etude sédimentologique et hydrobiologique d'une lagune tropicale : le lac Nokoué (Rép. du Bénin, Afrique de l'Ouest)." Angers, 1994. http://www.theses.fr/1994ANGE0021.
Full textLa, Jeunesse Isabelle. "Etude intégrée dynamique du phosphore dans le système bassin versant-lagune de Thau (mer Méditerranée, Hérault)." Orléans, 2001. http://www.theses.fr/2001ORLE2084.
Full textMansouri, Ahlem. "Approche intégrée de suivi d’un procédé de bioremédiation : application aux sédiments de la lagune de Bizerte." Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4106.
Full textThe Bizerte lagoon, is a high polluted area with a variety of pollutants mainly BaP, and the DDT. The study began with the identification of the pollution of the lagoon. Secondly, a selection of bacteria capable of degrading a mixture of the DDT and the BaP was implanted, these strains were: Pseudomonas stutzeri, Cupriavidus metallidurans and Rhodococcus equi. Then, the capacîty of biodegradation of these bacterial strains was studied, but also the coupling of their activities of biodegradation with the effects of the stalic magnetic fields to improve the bioremediation efficiency was done. ln order to propose a monitoring approach for the bioremediation process, a bioremediation experiment at the laboratory scale has been designed. The sediments were bioaugmented by the previously identified bacteria. The monitoring of bioremediation has been carried out by several tools. The bioaugmentation of sediments resulted in a significant difference between the batch of control bioreators compared to the bioaugmented batch. This difference is observed in all the tests. Indeed, bioaugmented bioreactors generate less toxicity and genotoxicity than control bioreactors. Throughout the monitoring, the levels of toxicity and genotoxicity are fluctuating. These fluctuations are the results of the toxicity generated by the gradual release of by-products that appear over time. It is therefore possible to conclude the importance of the toxicity tests among the routine tests for the monitoring of a bioprocess since the degradation products that are released during the process tend to generate more than toxicity and mutagenicity
Badissa, Sylvain. "Influence de la stratification thermique verticale sur l'écoulement du fluide dans une lagune naturelle non aérée." Compiègne, 1986. http://www.theses.fr/1986COMPD043.
Full textNon aerated lagoon systems are currently popular as a means of treating used domestic water, mainly due to their low running costs. However, their design and dimensioning remain largely empirical ; in order to optimize their performance and thus reduce the area necessary, a more scientific approach is required. As lagoon systems are simply biological reactors, their behaviour depends on the kinetics of the degradation of the B. O. D but also on the nature of the flow of fluid in the lagoon system. The measurement of the R. T. D and the influence of certain geometric and operating parameters on these R. T. D have been clarified in the research of P. HOUANG. In this study, we have sought to examine the influence of the vertical thermal stratification on the non aerated lagoons. After experimentally evaluating this influence for parallelepiped models, through a phenomenological flow model, we have deduced the R. T. D of a model lagoon in the presence of a vertical thermal stratification. In addition we have estimated the rate of degradation of the B. O. D for the layered lagoon and compared for the same degradation rate, the surface area required for a layered lagoon and for a lagoon assumed isothermal at the mean temperature pf the lagoon. The thermal stratification must be taken into account if a non isothermal lagoon is to be correctly dimensioned
Péquin, Bérangère, and Bérangère Péquin. "Structure et diversité de la communauté de protistes de la lagune de Havre-aux-Maisons, Canada." Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/26435.
Full textLa lagune de Havre-aux-Maisons aux Îles-de-la-Madeleine dans le Golfe du Saint-Laurent est un système semi-fermé, avec un temps de renouvellement de l’eau jusqu’à 45 jours. Une activité mytilicole modérée a lieu dans la lagune; les moules (Mytilus edulis L.) sont principalement suspendues sous la surface de l’eau. Les moules dépendent de la matière en suspension pour leur nourriture, incluant les micro-organismes eucaryotes planctoniques (protistes et phytoplancton). La répartition spatiale et temporelle des espèces microbiennes marines eucaryotes est déterminée par les conditions physiques, biologiques et chimiques. L’objectif principal de cette thèse était de caractériser la communauté microbienne eucaryote par des méthodes moléculaires (séquençage à haut-débit), à court et moyen terme. Les échantillons ont été prélevés à partir d’un site unique de Juin à Octobre 2009, et pour deux semaines en Août 2010 dans des zones avec ou sans ferme de moules. Les acides gras de la lagune et ceux assimilés et rejetés par M.edulis ont aussi été examinés en 2009 pour déterminer le lien entre profile lipidique planctonique et celui des moules. Dans l’ensemble la vitesse moyenne de vent avait un effet sur la composition en espèces planctoniques en 2009, il y avait une alternance entre les dinoflagellés et les petites cellules photosynthétiques. Ce changement de communauté a peu d’effet sur la nutrition des moules, qui ont ajusté leurs profils d’acides gras indépendamment de la source de nourriture disponible dans l’échelle de temps de l’étude. En 2010, l’échantillonnage aux deux jours pendant deux semaines, la communauté planctonique était similaire dans et hors la ferme de moules, mais différait à chaque échantillonnage. Au niveau de l’espèce, peu d’entre elles semblaient impacter par la présence des moules, ce qui suggére une forte homogénéisation, verticale et horizontale, de l’eau de la lagune. En date, il s’agit de l’étude la plus exhaustive caractérisant la communauté microbienne eucaryotes concernant sa diversité et sa strucuture dans une lagune des Îles de la Madeleine, où la communauté est sensible aux événements météorologiques extérieurs.
The Havre-aux-Maisons lagoon in the Magdalen Islands in Gulf of St-Lawrence is a semi-enclosed system with water residence time of up to 45 days. Limited myticulture is carried out in the lagune; mostly suspended mussels farming, (Mytilus edulis L.). The mussels depend on suspended material, including planktonic microbial eukaryotes (protists and phytoplankton) for food. The spatial and temporal distribution of marine eukaryotic microbial species is thought to be determined by physical, chemical and biological conditions. The main goal of this thesis was to characterize the microbial eukaryotic community uising molecular methods (high throughput sequencing) over medium and short terms. The samples were collected from a single site from June to October 2009 and for two weeks in August 2010 in areas away from and within a mussel farm. Fatty acids from the lagoon plankton and those assimilated and rejected by M. edulis were also examined in 2009 to determine any links between planktonic and mussel lipid profiles. Overall average wind field had the strongest effect on planktonic species composition and in 2009 there was an alternation between dinoflagellates and small photosynthetic cells. The community had little effect on the nutrition of mussels, which adjusted their fatty acid profiles independent of the source of food available over the time scale investigated. In 2010, when sampling every 2 days for two weeks, the plankton community was similar in both farm and off farm sites, but differed on each sampling occasion. At the level of species, very few species were impacted by the presence of mussels suggesting strong horizontal as well as vertical mixing in the lagoon. This is the most exhaustive study to date on the diversity and community structure of microbial eukaryotics in a Magdalen Island lagoon, where we found that the community was most sensitive to external weather events.
The Havre-aux-Maisons lagoon in the Magdalen Islands in Gulf of St-Lawrence is a semi-enclosed system with water residence time of up to 45 days. Limited myticulture is carried out in the lagune; mostly suspended mussels farming, (Mytilus edulis L.). The mussels depend on suspended material, including planktonic microbial eukaryotes (protists and phytoplankton) for food. The spatial and temporal distribution of marine eukaryotic microbial species is thought to be determined by physical, chemical and biological conditions. The main goal of this thesis was to characterize the microbial eukaryotic community uising molecular methods (high throughput sequencing) over medium and short terms. The samples were collected from a single site from June to October 2009 and for two weeks in August 2010 in areas away from and within a mussel farm. Fatty acids from the lagoon plankton and those assimilated and rejected by M. edulis were also examined in 2009 to determine any links between planktonic and mussel lipid profiles. Overall average wind field had the strongest effect on planktonic species composition and in 2009 there was an alternation between dinoflagellates and small photosynthetic cells. The community had little effect on the nutrition of mussels, which adjusted their fatty acid profiles independent of the source of food available over the time scale investigated. In 2010, when sampling every 2 days for two weeks, the plankton community was similar in both farm and off farm sites, but differed on each sampling occasion. At the level of species, very few species were impacted by the presence of mussels suggesting strong horizontal as well as vertical mixing in the lagoon. This is the most exhaustive study to date on the diversity and community structure of microbial eukaryotics in a Magdalen Island lagoon, where we found that the community was most sensitive to external weather events.
Badissa, Sylvain. "Influence de la stratification thermique verticale sur l'écoulement du fluide dans une lagune naturelle non aérée." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375956405.
Full textRita, Vianello. "Le savoir des mytiliculteurs de la lagune de Venise et du littoral breton. Etude d'anthropologie comparative." Doctoral thesis, Universitée de Bretagne Occidentale, 2013. http://hdl.handle.net/10278/3729726.
Full textVianello, Rita <1966>. "Le savoir des mytiliculteurs de la lagune de Venise et du littoral breton : étude d'anthropologie comparative." Doctoral thesis, Università Ca' Foscari Venezia, 2013. http://hdl.handle.net/10579/3963.
Full textYahyaoui, Ahlem. "Conflits d'usage environnementaux sur les rives de la lagune de Bizerte (Tunisie) : une mise en perspective méditerranéenne." Electronic Thesis or Diss., Aix-Marseille, 2018. http://theses.univ-amu.fr.lama.univ-amu.fr/181024_YAHYAOUI_465hyeh752pqoh615vivk996ykhs_TH.pdf.
Full textThe dissertation seeks to recognize the socio-spatial meanings of dynamic conflicts related to the environment in the lagoon and to assess its effects in terms of environmental governance as well. The analysis concentrates on the reasons and the genesis of the actors’ oppositions at work around the lagoon of Bizerte (Tunisia) and the pond of Berre (Marseille). Putting the light on these conflicts represents an issue for the integrated wetland management. This topic has been tackled on by other researchers. However, it remains a major interest due to the knowledge and the originality of the territory. Particularly, the thesis raises the question of the potential impacts that conflicts can have on organizations and institutions in place. In fact, is it possible that public action will be renewed to follow the emergence or conflicts regulation? This question is tied to the challenges of the current and major companies and to an extreme rapidity of territory changing: Bizerte’s lagoon is situated on the southern shore of the Mediterranean and in a country where the regime is in continuous transition. This research covers the ground to study the potential emergence of the participative approach and the social integration of environmental issues in coastal, urban and rural territory
Michel, Claude. "Exploitation des poissons en milieu lagunaire méditerranéen : dynamique du peuplement ichtyologique de la lagune de Tunis et des populations exploitées." Perpignan, 1986. http://www.theses.fr/1986PERP0017.
Full text