Dissertations / Theses on the topic 'Blue Marble'
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Hewitt, David A. "Natural mortality of blue crab : estimation and influence on population dynamics /." W&M ScholarWorks, 2008. http://www.vims.edu/library/Theses/Hewitt08.pdf.
Full textSchulman, Jessica L. "Habitat Complexity as a Determinant of Juvenile Blue Crab Survival." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539617703.
Full textHovel, Kevin. "The effect of seagrass habitat fragmentation on juvenile blue crab survival." W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539616700.
Full textWood, Megan. "Juvenile Blue Crab (Callinectes Sapidus) Response to Altered Nursery Habitat." W&M ScholarWorks, 2017. https://scholarworks.wm.edu/etd/1499449868.
Full textBrylawski, Bryce J. "Cultural eutrophication and the clam Macoma balthica: Evidence for trophic disruption and effects on blue crabs." W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539616585.
Full textEggleston, David B. "Predator-Prey Dynamics between the Blue Crab: Callineates sapidus Rathbun, and Juvenile Oysters Crassostrea virginica (Gmelin)." W&M ScholarWorks, 1988. https://scholarworks.wm.edu/etd/1539617593.
Full textDavis, John Howell. "Implications of a Decrease in the Mature Size of Female Blue Crab, Callinectes sapidus." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-01032006-152433/.
Full textMin, Hojune. "Effects of nutrients from fish farms on culture of blue mussel (Mytilus edulis)." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for biologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-14589.
Full textMansour, Randa A. "Foraging ecology of the blue crab, Callinectes sapidus Rathbun, in lower Chesapeake Bay." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539616761.
Full textJohnson, Eric Gordon. "Population dynamics and stock assessment of the blue crab in North Carolina." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-06012004-095447/.
Full textReyns, Nathalie Brigitte. "Biophysical dispersal dynamics of the blue crab in Pamlico Sound, North Carolina." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-10312004-143755/.
Full textBucci, John P. "Blue Crab Trophic Dynamics: Stable Isotope Analyses in Two North Carolina Estuaries." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-11222003-195124/.
Full textOlmi, Eugene J. III. "Immigration of blue crab (Callinectes sapidus) megalopae in the York River, Virginia: Patterns and processes." W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539616798.
Full textGarrison, Haley S. "Effects of Episodic Turbulence on Diatoms: with Comments on the use of Evans Blue Stain for Live-Dead Determinations." W&M ScholarWorks, 2013. https://scholarworks.wm.edu/etd/1539617938.
Full textChaves, Juan Carlos. "Biological and Operational Factors Causing Mortality in North Carolina's Soft-Shell Blue Crab Industry." NCSU, 2002. http://www.lib.ncsu.edu/theses/available/etd-07232002-164130/.
Full textMcMahon, David Z. "The Effects of Various Salinities on the Growth, Reproduction, and Pathology of Blue Tilapia (Oreochromis aureus)." NSUWorks, 1998. http://nsuworks.nova.edu/occ_stuetd/327.
Full textLayman, Bruce Clare. "Role of Habitat Features and Chemical Cues in Substrate Selection by Blue Crab Megalopae: Evidence from Laboratory Experiments." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539617647.
Full textDutton, Daniel J. "Habitat Utilization and Dive Characterization of Blue Marlin (Makaira nigricans) and White Marlin (Kajikia albida) in the Western Atlantic Ocean." W&M ScholarWorks, 2010. https://scholarworks.wm.edu/etd/1539617891.
Full textPardieck, Renee A. "The Influence of Location, Seagrass Species and Water Depth on the Settlement and Distribution of Early Stage Blue Crabs." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539617708.
Full textRoche, Sylvain. "Réenchanter le maritime par la promesse énergétique : technologies, trajectoires, discours." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0064.
Full textThis thesis sheds light on the dynamics of change in the energy system by taking the example of marine renewable energies (MRE). By exploring ten case studies (both sectoral and territorial), it reflects on the reasons for the return of these technologies in the 2000’s. Previously excluded from the dominant paradigm of French electricity production, in the 1980s, marine renewable energies are currently making a comeback in the context of the systemic crisis of the 3Es (environmental, economic and energy). At the interface of energy policies (energy transition policies) and maritime policies (blue growth policies), marine renewable energies were legitimized when the sea became a new horizon for (re)building visionary, avant-garde and technopolitical discourses. Through this, we highlight the importance of beliefs and collective representations of technological activity. Through the diversity of technological trajectories discussed in this thesis (tidal stream and tidal range energy, wave energy, ocean thermal energy conversion and offshore wind energy), we show that, in France, the industry of marine renewable energies presents itself as a political construction without asserted technological consistency, at the interface between different technical worlds. This thesis put into perspective the notion of disruptive innovation and creative destruction by highlighting phenomena of technological rebirth, which can take several decades and even centuries. Through a retroprospective analysis, this thesis defends the idea that the dynamics of change of the energy system are not mainly driven by creation and novelty, but could, rather, be construed as a process of update and reinterpretation of existing technological principles. This thesis aims to provide insights to economists, sociologists and historians of technology who try to understand the trajectories of innovation and the conditions for success of energy technologies
Carver, Adina Motz. "SELECTIVE FISHING PRESSURE ON LARGE MALE BLUE CRABS NEGATIVELY AFFECTSMALE SIZE, SEX RATIO, AND POPULATION REPRODUCTIVE POTENTIALIN THE UPPER CHESAPEAKE BAY." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20011116-104952.
Full textA male-focused size-selective fishing pressure has the potential to reduce the average size of the males in the population, reduce the density of males in the population, and/or raise the sex ratio of females to males. All of these may affect the mating dynamics of the population by reducing the amount of sperm that males provide to females and decreasing the number of males available for copulation. I used three different approaches to investigate the effect of the fishery on the population. First I collected paired and unpaired crabs from the field to investigate crab size and seminal stores in nature. This approach substantiated that male blue crabs subjected to heavier fishing pressure are smaller, and that smaller males pass less sperm and accessory fluid to females. It also demonstrated that although the most depleted males in the population are not mating, some that continue to form pre-copulatory pairs are as sperm depleted as males that had just completed copulation.My second approach involved the use of biotelemetry to monitor mating behaviors in the field. Tracked males demonstrated a proportionately greater amount of pairing behavior than tracked prepubertal females, which is consistent with expectations of crab behavior in a population with a female-biased Operational Sex Ratio. My third approach was to examine a long-term trawl data set for trends over time. A decline in the average size of mature males (carapace width >110 mm) and an increase in the operational sex ratio of pre-pubertal females to mature males (carapace width >110 mm) and pre-pubertal females to legally fished males (carapace width >127 mm) were found at one of the four trawl locations. The observed trends in size and sex ratio at that trawl location are as would be expected in a population where an increasingly intense fishery has been removing large males. Analysis of seminal stores in conjunction with the crab behaviors and population trends provides evidence that the fishery is in fact having a detrimental affect on the reproductive potential of the blue crab populatio
Metcalf, Karen S. "The Relationship of Habitat and Spatial Scale Upon the Developmental State and Settlement of Blue Crab Postlarvae in Chesapeake Bay." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539617638.
Full textMoody, Kirt E. "Predation on juvenile blue crabs, Callinectes sapidus Rathbun, in lower Chesapeake Bay: Patterns, predators, and potential impacts." W&M ScholarWorks, 1994. https://scholarworks.wm.edu/etd/1539616782.
Full textHoward, Jason Lee. "PATTERNS OF CARBON METABOLISM, STORAGE, AND REMINERALIZATION IN SEAGRASS ECOSYSTEMS." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3719.
Full textPile, Adele J. "Effects of the Habitat and Size-Specific Predation on the Ontogenetic Shift in Habitat use by Newly Settled Blue Crabs, Callinectes sapidus." W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539617655.
Full textO'Leary, Patricia Anne. "The Development of Fiddler Crabs (Uca Spp.) as a Comparative Model System for the Parasitic Dinoflagellate, Hematodinium Perezi and its Natural Host the Blue Crab, Callinectes Sapidus." W&M ScholarWorks, 2018. https://scholarworks.wm.edu/etd/1550153657.
Full textSchneider, Lutz [Verfasser], Marcel [Akademischer Betreuer] Thum, and Ulrich [Akademischer Betreuer] Blum. "Alterung und Arbeitsmarkt : Eine Untersuchung zum Einfluss des Alters von Beschäftigten auf Produktivität, Innovation und Mobilität / Lutz Schneider. Gutachter: Marcel Thum ; Ulrich Blum. Betreuer: Marcel Thum." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1019001275/34.
Full textMooney, Melissa. "A comparison of feeding physiology in cultured and wild blue mussels Mytilus edulis and M. trossulus." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0034/MQ62404.pdf.
Full textStark, Tiara Elizabeth. "Phylogeography and Genetic Diversity of the Commercially-Collected Caribbean Blue-Legged Hermit Crab: Implications for Conservation." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543499269936318.
Full textOlsson, Björne. "Protein Expression in Baltic Sea Blue Mussels Exposed to Natural and Anthropogenic Stress : The use of stress inducible proteins in ecotoxicological studies." Doctoral thesis, Stockholm University, Department of Systems Ecology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-542.
Full textThe focus of this thesis is the early detection of stress in the environment. It has been proposed that studies on the cellular level would detect stress reactions earlier in time compared to common physiological methods. In a series of experiments we investigated how different stress factors, both natural and introduced by man, affect levels of stress proteins. One- and two-dimensional gels were used to determine individual proteins and families of proteins. The two-dimensional gels were also used in a proteomic approach, were the presence and absence of proteins after treatment was observed, and the protein expression signatures (PES) were identified.
Baltic Mytilus edulis was used in all experiments and it is evident that earlier observed differences in physiological rates and pollution sensitivity, compared to marine mussels, is also manifested as lower concentrations of stress proteins after exposure to copper and cadmium. When the Baltic mussels were allowed to acclimate for one month the difference decreased, suggesting an environmentally induced difference (paper I). Pre-exposure to heat before exposure to either a second heat-shock or cadmium was found to enhance the levels of HSP70 and thus tolerance, significantly (paper II). Exposure to a mixture of stress factors (PCB, copper and lowered salinity) revealed synergistic, additive and antagonistic effects in induction of 6 different stress proteins. When analyzing a large number of proteins it was shown that it is possible to identify PES with this technique, and we hypothesize that it could be possible to separate responses to mixtures of stress factors (Papers III and IV). Different techniques were also applied to analyze the protein expression pattern when mussels were exposed to PAH- and PCB-fractions extracted from Baltic Sea sediments. In this experiment the protein assays were accompanied by physiological measurements. All methods indicated stressed conditions, but the variation between individual mussels within treatments was smaller in terms of protein response than for physiological parameters (paper V). It is concluded that measuring the induction of stress proteins is a reliable way to detect stressful conditions. Proteins visualized on a one dimensional gel give a “gross” picture of an organism’s condition. The major challenge is to identify the origin and severity of the elucidated stress response. Further mapping of two-dimensional gels suggested that protein patterns are specific to type and level of stress.
A most important future step is to establish links between sub-cellular protein response to well known physiological effects. This should include long term experiments where altered protein expression signatures are linked to life history characteristics like survival, growth and reproductive success.
Howey, Lucy A. "Seasonal Movement Patterns, Migratory Behavior and Habitat Utilization of the Bblue Shark (Prionace glauca) in the Western North Atlantic." NSUWorks, 2010. http://nsuworks.nova.edu/occ_stuetd/217.
Full textYUAN, YI-MOND. "Le ble concurrence t-il le riz dans les pays du sud-est asiatique : l'exemple d'une economie de marche, taiwan." Paris, Institut national d'agronomie de Paris Grignon, 1988. http://www.theses.fr/1988INAPA009.
Full textLeleu, Kevin. "Suivi et évaluation de la pêche professionnelle au sein d'une Aire Marine Protégée : protocoles d'enquêtes et indicateurs de pression et d'impact. Application au Parc Marin de la Côte Bleue." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4011.
Full textThe overexploitation of fishery resources has led to a major fisheries crisis. In this context, artisanal fisheries, and in particular small-scale coastal fisheries, appear as relevant alternatives for a sustainable use of coastal resources. But the diversity of fishing gears and targeted species diversity make it difficult to assess this important component of the commercial fishery. Hence, the activity of small-scale artisanal fishing remains poorly known in the Mediterranean Sea and few studies focus on an assessment of this activity at the scale of a Marine Protected Area (MPA). MPAs are yet more and more used as management tools for these fisheries, as protection effects and targeted access regulations may benefit to commercial fishers. As many MPAs are going to be established in the short term, it seems necessary for managers and for scientists, to have indicators to monitor the artisanal small-scale coastal fishing activity within an MPA, and to estimate the effects of MPA management on this activity. A field protocol was defined and implemented between July 2009 and June 2010 within the Parc Marin de la Côte Bleue (PMCB), a French Mediterranean MPA including two marine reserves of different age and size. The collected data allowed identifying seven main métiers within the PMCB, and characterizing them by group of target species, type of gear, fishing grounds and fishing periods. Fishing effort and catch were estimated. In the Côte Bleue area, 3 512 fishing trips and 4645 fishing operations were performed by 30 active boats during the studied period, for a total of 10 300 km of immersed nets
Bouffaut, Léa. "Detection and classification in passive acoustic contexts : application to blue whale low-frequency signals Passive stochastic matched filter for Antarctic blue whale call detection, in The Journal of the Acoustical Society of America 144 (2), 2018 Baleen whale distribution and seasonal occurrence revealed by an ocean bottom seismometer network in the Western Indian Ocean, in Deep Sea Research Part II: Topical Studies in Oceanography 161, March 2019." Thesis, Brest, 2019. http://www.theses.fr/2019BRES0057.
Full textThe analysis of the large volumes of data resulting from continuous and long-term monitoring efforts of blue whales (BWs) benefits from the automated detection of target signals. This thesis investigates the challenging problem of the detection and classification of stereotyped signals in a low-frequency passive acoustic context where (1) signals traveling long distances are deteriorated by the propagation channel, (2) overlapping noises interfere and, (3) SNRs vary continuously. Developed methods are applied to recordings from ocean bottom seismometers deployed in the western Indian Ocean.First, the stochastic matched filter (SMF) is adapted to the passive context by overcoming noise estimation and estimating the SNR automatically. This filter is successfully applied to the detection of Antarctic blue whales calls and is compared to the MF and the Z-detector on an annotated ground-truth dataset exhibiting various SNRs and noises. The passive SMF showed better performances, increasing the detection range up to 100 km in the presence of ship noise.The problematic of the detection of concurrently calling species is addressed based on a pattern recognition development for the automatic transcription of BW songs where, tonal signals are extracted, characterized, and classified. The hence identified signals are then reconstructed as separate waveforms reconstructing of the underlying songs. The success of the reconstruction relies on the quality of the tonal detector: the ridge detector was chosen for its efficiency. Training and unsupervised application revealed promising results of the proposed transcription method and its utility for multi-species analysis
Hill, Jennifer Marie. "Predator biomass and habitat characteristics affect the magnitude of consumptive and non-consumptive effects (NCEs): experiments between blue crabs, mud crabs, and oyster prey." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41172.
Full textBarber, Marcus. "Where the clouds stand Australian Aboriginal relationships to water, place, and the marine environment in Blue Mud Bay, Northern Territory /." Click here for electronic access, 2005. http://adt.caul.edu.au/homesearch/get/?mode=advanced&format=summary&nratt=2&combiner0=and&op0=ss&att1=DC.Identifier&combiner1=and&op1=-sw&prevquery=&att0=DC.Title&val0=Where+the+clouds+stand&val1=NBD%3A&submit=Search.
Full textSUL, Juliana Assunção Ivar do. "Contaminação ambiental por microplásticos em Fernando de Noronha, Abrolhos e Trindade." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/18853.
Full textMade available in DSpace on 2017-05-22T16:32:34Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) TESE_Juliana Ivar do Sul_SEM assinaturas.pdf: 5438964 bytes, checksum: 3a47f8c982e48dec47ae2a5fbae63c0b (MD5) Previous issue date: 2014-05-16
Recentemente, a comunidade científica especializada vem concentrando seus esforços na identificação, caracterização e quantificação dos microplásticos, definidos pela literatura como partículas plásticas menores que 5 milímetros. Microplásticos então presentes na superfície dos oceanos, em praias arenosas e ambientes lamosos, desde o Equador até os Pólos, em praias urbanas e regiões remotas do globo, e ainda depositados em sedimentos profundos (>2.000m). Experimentos de laboratório indicam que estas partículas plásticas podem ser ingeridas por organismos de todos os níveis da teia trófica marinha. Poluentes orgânicos, como DDTs e PCBs, e inorgânicos presentes na água do mar podem estar adsorvidos a estes plásticos, transportando contaminantes químicos para diversas regiões do globo, ou sendo liberados quando no trato gastrointestinal de vertebrados e invertebrados se ingeridos, podendo ainda ser transportados ao longo da teia trófica marinha. Há mais de 10 anos relata-se que no Oceano Pacífico Norte microplásticos estão presentes principalmente no centro do giro subtropical, aparentemente influenciados por variáveis oceanográficas. Para o Oceano Atlântico tropical, evidências sobre a presença de microplásticos existiam apenas para as praias arenosas do Arquipélago de Fernando de Noronha (3°S, 32°W), e para as águas adjacentes ao Arquipélago de São Pedro e São Paulo. Para preencher esta lacuna, microplásticos foram o foco da amostragem em três importantes ambientes insulares no oeste do Oceano Atlântico tropical: Arquipélago de Fernando de Noronha, Arquipélago de Abrolhos (17°S, 38°W) e a Ilha da Trindade (20°S, 29°W) em 4 expedições científicas realizadas entre dezembro de 2011 e março de 2013. Plásticos flutuantes foram amostrados através de arrastos planctônicos (neuston) nas áreas marinhas adjacentes a estes ambientes. Um total de 160 arrastos foi realizado. Em Trindade, mais de 90% dos arrastos estavam contaminados por microplásticos, identificados como fragmentos duros, fragmentos moles, paint chips, linhas e fibras. Em Noronha e Abrolhos aproximadamente metade dos arrastos estava contaminada. Fragmentos plásticos duros foram os tipos de itens mais amostrados assim como em outros estudos de microplásticos em amostras de plâncton. Entre os fragmentos, >75% tinham 5mm ou menos. A contaminação média foi de 0,03 partículas por m3, inferior às quantidades previamente conhecidas no Oceano Pacífico. As amostras de microplásticos depositados na superfície do sedimento foram coletadas nas praias arenosas em cada uma das ilhas através de quadrantes. As amostras coletadas também foram analisadas quanto a granulometria predominante, já que estas informações ainda eram inexistentes para as ilhas estudadas. Em Abrolhos nenhuma partícula plástica foi amostrada. Fragmentos plásticos duros e esférulas plásticas foram identificados somente em Fernando de Noronha e Trindade, sendo que o lado mais exposto à ação de ventos e corrente superficias predominantes estava mais contaminado, quando comparado ao lado relativamente mais protegido nas ilhas estudadas. Estes resultados são os primeiros indícios da contaminação do oeste do Oceano Atlântico tropical em relação à contaminação por microplásticos. A presença destes microplásticos alerta para a vulnerabilidade destas ilhas e sua biota em relação á contaminação por plásticos.
Recently, the scientific community is focussed on the identification, characterization e quantification of microplastics, defined in the literature as those plastic particles with less than 5 millimetres. Microplastics are widespread on the ocean’s surface, on sand beaches and mud sediments, from the equator to the poles, on urban beaches and remote regions in the globe, and even deposited on deep sediments (>2,000m). Laboratory experiments indicate that organisms from every level of the marine food web potentially ingest microplastic particles. Organic, such as DDTs and PCBs, and inorganic pollutants available in seawater may adsorbed onto microplastics, transporting chemical contaminants to diverse regions in the globe, or being released in the gastrointestinal tract of vertebrates and invertebrates if ingested, when they are even transported along the marine food web. For more than 10 years, there were reports on the occurrence of microplastics in the North Pacific Ocean, mainly in the centre of the subtropical gyre, probably influenced by oceanographic variables. To the tropical Atlantic Ocean, however, evidences on the presence of microplastics were available only to sandy beaches in the Fernando de Noronha Archipelago (3°S, 32°W), and to waters around the São Pedro e São Paulo Archipelago. To fulfil this gap, microplastics were studied in three important insular environments in the western Atlantic Ocean: the Fernando de Noronha Archipelago, the Abrolhos Archipelago (17°S, 38°W) and the Trindade island (20°S, 29°W), during four scientific expeditions between December 2011 and March 2103. Floating plastics were collected by plankton tows (neuston) on the sea surface in the adjacent region to these environments. A total of 160 tows were conducted. In Trindade Island, more than 90% of the tows were contaminated with microplastics, identified as hard plastic fragments, soft fragments, paint chips, lines and fibres. In Fernando de Noronha and Abrolhos, approximately half of the tows were contaminated. Hard plastic fragments were the majority of the sampled items, as well as reported in other studies with plankton samples. Among plastic fragments, >75% had 5mm or less. The mean contamination pattern was 0.03 particles/m3, less than previously reported on the Pacific Ocean. Microplastics sampled on sediments were collected on sandy beaches in each island by quadrants dispoded in the strandline. Samples were also analysed in the relation to the main grain size of sediments because these information was still non-existent to the studied islands. In Abrolhos, no plastic particle was sampled. Hard plastic fragments and plastic pellets were identified in Fernando de Noronha and Trindade, where the windward side of the islans were significantly more contaminated when compared to the leeward side. These results are the first results indicating the occurrence of microplastic debris particles in the Western tropical Atlantic Ocean. The occurrence of microplastics highlights the vulnerability of these islands and their biota in relation to microplastic pollution.
Patris, Julie. "Contributions en méthodes pour le suivi de mysticètes par acoustique passive." Electronic Thesis or Diss., Toulon, 2019. http://www.theses.fr/2019TOUL0016.
Full textPassive acoustic monitoring has a growing importance in marine mammals studies. This work is concerned with the largest of marine mammals, the blue whale (Balaenoptera musculus). We obtained a new corpus of acoustic data in the northern part of Chile, in the Humboldt archipelago. We show the presence of a song characteristic of the 'Chilean' blue whale, formerly described in southern Chile and Galapagos islands. Based on this sang type, we propose new methods of analysing and classifying pulsed sounds. Using the fundamental frequency thus obtained, we analyse the blue whale's sang, showing a general evolution of the frequency on a decadal scale. We also construct a method of monohydrophone source localisation based on high performance simulation of the acoustic wave field, by spectral elements methods. We conclude emphasizing on the importance of bioacoustic for monitoring the marine world
Monnet, Rodolphe. "La politique extérieure de l'Inde en Afrique." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCB025.
Full textSince 2001 and the reshuffling of the balance of power, India has become one of the influential actors in an increasingly multipolar international context. The current groundswells are reshuffling powers between Nations in shaping new alliances and new power games. India is, more than ever, involved in this trend since the current Prime Minister, Narendra Modi, came to power in 2014. He conducts an ambitious foreign policy as a means to make his country a global and respected power. The context of the issue detailed in this document is: to what extent does Africa's place in India's foreign policy enables India to reach this status of power? This thesis investigates the following three themes: Firstly, the Indian Ocean's place in the Indo-African relationship should reflect Africa's role in India's will to make the Indian Ocean region a peaceful and secured space in which India is a decisive player in front of powerful and heterogeneous political actors. Secondly, this thesis focuses on assessing Africa's role in India's initiatives to be an influential player on politics on the international agenda through international bodies, its bilateral relations with African states and the Indian diaspora settled down in these countries. Thirdly, India's search for that particular status goes through the economic area and the assessment of India's economic footprint in Africa to better establish its influence on that Continent. This study tries to shed the light on India's foreign policy while the United States are reassessing their involvement in the Indian Ocean, and while China is setting up its "One Belt, One Road" and India and Japan have just come together to propose a new partnership to Africa
Vaz, Bárbara Maria Correia. "Development of downstream processes for pigment valorization: a step towards blue biorefinery." Master's thesis, 2021. http://hdl.handle.net/10773/33018.
Full textAs diretrizes da Agenda 2030 para o Desenvolvimento Sustentável foram muito claras. Novas estratégias precisam de ser encontradas para garantir um futuro sustentável. Desta forma, os recursos marinhos surgem como matérias-primas naturais e renováveis para integrar uma estrutura de biorefinaria marinha e uma abordagem de economia circular. Através da conversão de biomassa, uma produção integrada de biocombustíveis e compostos de valor acrescentado pode ser projetada, permitindo a recuperação de vários compostos com impactos ambientais mínimos e um crescimento económico sustentável. Pigmentos são compostos naturais utilizados em aplicações de elevado padrão devido à sua cor e ao seu alto interesse biológico, podendo ser encontrados em diversos recursos marinhos. No entanto, as técnicas convencionais para recuperá-los requerem o uso de metodologias complexas e demoradas que podem levar à degradação e/ou perda de estabilidade dos compostos, alto consumo de energia e baixos rendimentos de extração. Solventes alternativos, como soluções aquosas de líquidos iónicos e surfactantes, aparecem como opções mais sustentáveis que podem melhorar a estabilidade térmica e química dos pigmentos, obter rendimentos de extração mais altos, enquanto minimizam os impactos ambientais do processo. Neste trabalho, foram desenvolvidos dois procedimentos para recuperar diferentes pigmentos utilizando solventes alternativos, a fim de superar as dificuldades encontradas nos métodos convencionais. No primeiro trabalho, uma técnica de extração em fase sólida foi usada para fracionar clorofilas e xantofilas. A seguir, para eluir as clorofilas da resina AmberLite™ HPR900 OH, as soluções aquosas de líquidos iónicos revelaram-se solventes eficientes para valorizar simultaneamente xantofilas e clorofilas, e reaproveitar a resina em vários novos ciclos de purificação. O segundo trabalho teve como foco a extração do pigmento bacterioruberina com soluções aquosas de surfactantes a partir da Haloferax mediterranei, sendo a classe dos não iónicos a que apresentou maiores rendimentos de extração. Além disso, a purificação da bacterioruberina também foi abordada através de uma simples precipitação induzida com etanol como anti-solvente para recuperar proteínas como um segundo composto de elevado valor comercial. Em ambos os trabalhos foram desenvolvidos com sucesso procedimentos de fácil implementação e ambientalmente sustentáveis recorrendo ao uso de solventes aquosos, sendo as condições operacionais otimizadas para reduzir os impactos económicos e ambientais, e permitir alcançar rendimentos mais elevados.
Mestrado em Engenharia Química
Baptista, Silvia de Almeida. "Screening of polyhydroxyalkanoates producing bacteria isolated from marine ecosystems." Master's thesis, 2013. http://hdl.handle.net/10400.6/2945.
Full textOs Polihidroxialcanoatos (PHAs) são biopoliésteres biodegradáveis e termoplásticos ecológicos, que são acumulados sob a forma de materiais de armazenamento de energia em várias bactérias em condições de crescimento limitado e fonte de carbono em excesso. Neste estudo, as bactérias foram isoladas a partir de amostras recolhidas a partir de vários ecossistemas marinhos no arquipélago da Madeira, no Oceano Atlântico e seleccionadas pela sua capacidade de acumular poli-hidroxialcanoatos. Estas amostras foram extraídas do fundo do mar a uma profundidade de 30 e 1,700 metros para se obter uma maior diversidade de microorganismos e, por conseguinte, numa tentativa de obter novas estruturas de PHAs. As estirpes foram directamente isoladas de 612 placas mãe onde as amostras marinhas tinham sido previamente espalhadas. Na totalidade foram isoladas 724 estirpes a partir das placasmãe, das quais 174 demonstraram resultado positivo durante o screening com o corante Vermelho do Nilo. Todas as estirpes com resultado positivo sintetizaram inclusões intracelulares durante o crescimento em amido como fonte de carbono. Vinte e cinco isolados bacterianos foram testados em cultura de 25 mL com resultados promissores quanto à produção de PHA com armazenamento de 17,71 % para a estirpe MD12-107 e 9,30 % para a estirpe MD12-581. As inclusões foram analisadas através da técnica de cromatografia gasosa como sendo predominantemente poli-β-hidroxibutirato (PHB). A produção a partir das estirpes MD12-107 e MD12-581 foi testada em 100 ml e em bioreactor. Os melhores resultados foram alcançados pela estirpe MD12-581 com um armazenamento de PHA de 15,40% em menos de 6,5 horas, com 5,5 g/L de concentração de biomassa e uma taxa específica de crescimento de 0,24 h-1 quando cultivada num meio contendo 40 g/L de amido, 8 g/L de extracto de levedura e 4 g/L de peptona durante a produção em bioreactor.
Proteau, Philip J. "Oxylipins from temperate marine algae and a photoprotective sheath pigment from blue-green algae." Thesis, 1993. http://hdl.handle.net/1957/35584.
Full textGeldenhuys, Linda-Louise. "The influence of Blue Flag status on tourist decision-making in South Africa / Linda-Louise Geldenhuys." Thesis, 2014. http://hdl.handle.net/10394/11545.
Full textMCom (Tourism Management), North-West University, Potchefstroom Campus, 2014
Costa, Diogo Balcão Reis Peão da. "The influence of oxygen fronts and mesoscale eddies on the foraging patterns and space-use of blue and mako sharks." Master's thesis, 2021. http://hdl.handle.net/10400.1/17438.
Full textPelagic top predator populations worldwide have suffered sharp decreases in abundance over the last decades, with overfishing being the main cause of such declines. Blue (Prionace glauca) and mako sharks (Isurus oxyrinchus) are the two most caught pelagic shark species in the Atlantic Ocean, being classified, respectively, as “near-threatened” and “endangered” by the IUCN red list. However, their catches remain highly unregulated, unmonitored, and unreported. Identification of priority areas for pelagic top predators’ conservation is hampered by the high mobility of these animals and the consequent difficulty in determining aggregation areas, yet mesoscale dynamic features such as thermal fronts and eddies have been suggested to attract a variety of large apex predators while foraging. In this study, the foraging movements of 34 blue and 24 mako sharks, satellite-tagged across 5 different locations in the North Atlantic Ocean, were analysed in relation to dissolved oxygen (DO) fronts, which until now had not been considered. The results presented here suggest that DO fronts might represent extensive foraging areas for these two species, but particularly for blue sharks. Two different DO front types were noticed to attract these species: strong, persistent, and vertically structured thermal-oxygen fronts, where high productivity creates important foraging opportunities; and oxygen-only fronts associated with hypoxic areas where the compression of prey in the more oxygenated surface waters results in higher predator-prey encounters. This study also reinforces the importance of eddies for pelagic predators foraging in oligotrophic waters. In addition, mako sharks revealed a clear preference for cyclonic eddies (CEs) while blue sharks showed a more balanced usage of CEs and anticyclonic eddies. These results strongly suggest the integration of DO fronts in conservation and management modelling, as they can substantially improve the identification of priority conservation areas for these two sharks and, possibly, many other pelagic top predators.
Pryor, Miranda Leigh. "Temporal and spatial distribution of larval and post-larval blue mussels (Mytilus edulis/Mytilus trossulus) and starfish (Asterias vulgaris) within four Newfoundland mussel culture sites /." 2004.
Find full textBoucher, Sébastien. "Les ambitions maritimes de l’Inde dans l’océan Indien à l’aube du 21e siècle." Thèse, 2009. http://hdl.handle.net/1866/3504.
Full textThis thesis aims to analyze the relevance of a particular strategic culture, that of India. At least four cultural variables, each with a specific security dimension - identity, values, norms and perceptive lens - help us understand the Indian notions of security and power. The main hypothesis put forward in our paper is as follows: because Indian elite are deeply influenced by the prevailing Indian strategic culture, they perceive the Indian Ocean as the place where the main security threat to the country’s security lies. In addition, this particular security perception makes it possible to better understand India’s maritime ambitions in the Indian Ocean at the dawn of the 21st century. To confirm this, we analyze the influence of Indian strategic culture on strategic approaches privileged by Indian decision-makers within the Indian Ocean. We conclude that New Delhi’s strategic objective is to become the dominant maritime power in the Indian Ocean. The means to bring about this end is the creation of a strong blue water navy capable of sustaining a permanent squadron on patrol far from its naval bases. Furthermore, Indian naval activities - which are mainly defensive in nature - are justified by a doctrine of non-interference by major powers in Indian domestic affairs, a doctrine modeled on the Monroe Doctrine. According to the Indian doctrine, only the regional powers are able to preserve stability in the Indian Ocean region. Consequently, the Indian Government works to reduce the presence of foreign naval forces in the Indian Ocean.
Nold, Marcel Friedrich [Verfasser]. "Expression and release of chemokines associated with apoptotic cell death in human promonocytic U-937 cells and peripheral blood mononuclear cells = Assoziation von Expression und Sekretion von Chemokinen mit apoptotischem Zelltod in promonozytischen U-937-Zellen und mononukleären Zellen aus peripherem Blut / vorgelegt von Marcel Friedrich Nold." 2004. http://d-nb.info/972098445/34.
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