Dissertations / Theses on the topic 'Estuaries'
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Young, Ruth Anne. "Biotic Responses to Urbanisation in Mangrove Dominated Estuaries." Thesis, Griffith University, 2009. http://hdl.handle.net/10072/367651.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Kaselowski, Tanja. "Physico-chemical and microalgal characteristics of the Goukamma Estuary." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1011130.
Full textReay, William Glendon. "Estuarine sediment nutrient exchange : the importance of physical transport mechanisms and benthic micro-communities /." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07122007-103937/.
Full textVan, Niekerk Lara. "A framework for regional estuarine management : a South African case study." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/1659.
Full textChuwen, Benjamin Michael. "Characteristics of the ichthyofaunas of offshore waters in different types of estuary in Western Australia, including the biology of black bream Acanthopagrus butcheri /." Murdoch University Digital Theses Program, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20100210.154423.
Full textVeilleux, Lorraine. "Physical oceanography of northern estuaries." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59830.
Full textThe first one, in Rupert Bay (south-eastern corner of James Bay), describes tidal and local wind effects on circulation and mixing patterns for summer conditions. An estimate of terms in the lateral momentum equation shows that the centrifugal acceleration, the Coriolis force and the baroclinic pressure gradient are the most important forces at a mid-bay cross section transect.
The second study is concerned with the freshwater plume of Great Whale River (south-eastern Hudson Bay). CTD measurements were used to examine the lift-off point of the plume for under-ice and increasing discharge conditions. Comparison with existing models shows them to be inappropriate for under-ice conditions. Finally, the presence of supercooled water masses in the region of the study is reported.
Burningham, Helene. "Morphodynamics of west Donegal estuaries." Thesis, University of Ulster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274556.
Full textBarnes, Jonathan. "Nitrous oxide in UK estuaries." Thesis, University of Newcastle upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273682.
Full textBosco-Santos, Alice 1987. "Concentrações de elementos químicos em fígado e músculo de peixes demersais do sistema estuarino de Santos-Cubatão (SP) = aspectos temporal e espacial." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287681.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociências
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Resumo: A região de Cubatão (SP) abriga o maior polo industrial da América Latina e nos anos de 1980 ficou internacionalmente conhecida como um dos lugares mais seriamente poluídos do planeta por consequência de atividades industriais que ocasionaram grandes perturbações ambientais locais. Desde então, a contaminação da biota do sistema estuarino de Santos-Cubatão vem sendo monitorada e tem apresentado níveis elevados de elementos químicos nos organismos. Entretanto, ainda não foram realizados estudos que levem em consideração amostragens sazonais, que poderiam refletir as consequências das variações físico-químicas do ambiente na transferência de elementos químicos para a biota. No presente estudo, concentrações de As, Se e metais (Cd, Cr, Cu, Fe, Mn, Ni, Pb e Zn) foram determinadas em tecidos hepático e muscular de quatro espécies de peixes demersais do sistema estuarino em foco. No inverno/2010 e verão/2011, exemplares de Diapterus rhombeus, Genidens genidens, Centropomus parallelus e Mugil Liza foram coletados nos rios Morrão, Casqueiro e Cubatão. As amostras foram liofilizadas e os elementos químicos extraídos por digestão ácida com posterior análise por ICP-MS. Os resultados foram comparados ao LMT (limite máximo de tolerância) determinado pelo Ministério da Saúde do Brasil. Concentrações de As, Cr, Cu, Fe, Mn, Pb, Se e Zn foram, em geral, acima do LMT estabelecido pela legislação brasileira, e o tecido hepático apresentou concentrações químicas muito superiores às registradas no tecido muscular. Mugil Liza foi a espécie que acumulou mais elementos químicos em ambos os tecidos e é a melhor bioindicadora da área de estudo. As associações com o substrato e o hábito alimentar mostraram-se fatores decisivos na absorção de elementos químicos pelos organismos. Variabilidades sazonais foram observadas para as concentrações de Cd, Cr, Cu, Fe, Mn e Zn nos tecidos dos organismos analisados. Apesar de o rio Morrão ser considerado um dos cenários mais impactados do sistema estuarino de Santos-Cubatão, a biodisponibilidade de elementos químicos naquele ambiente não parece diferente de ambientes historicamente menos impactados, como os rios Casqueiro e Cubatão
Abstract: The city of Cubatão (SP) holds the largest industrial center in Latin America. During the 1980s, this region became internationally known as one of the most polluted cities in the world. This was a result of local industrial activities that caused large local environmental disturbances. Since then, biota contamination along the Santos-Cubatão estuarine system has been monitored, and high levels of contamination amongst organisms have been found. Environmental monitoring of the biota, taking into account the importance of seasonal variability, has not been considered. Concentrations of As, Se and metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) were determined in liver and muscle tissue of four species of demersal fishes of the Santos-Cubatão estuarine system. Specimens of Diapterus rhombeus, Genidens genidens, Centropomus parallelus and Mugil Liza were collected in summer and winter, in the Morrão, Casqueiro and Cubatão rivers. The samples were freeze-dried, underwent acid digestion and subsequently were analyzed using an ICP-MS. The results were compared to the LMT (maximum allowable) guidelines determined by the Brazilian Ministry of Health. Concentrations of As, Cr, Cu, Fe, Mn, Pb, Se, and Zn were generally above the LMT, as established by Brazilian legislation. Specific organs were analyzed and compared, for instance, liver tissue had contaminant concentrations much higher than those recorded in the muscle tissue. Mugil Liza was the species that accumulated more chemical elements in both tissues. The association with the substrate and eating habits proved to be decisive factors in the absorption of specific contaminants by the organisms. Seasonal variability was observed for concentrations of Cd, Cr, Cu, Fe, Mn, and Zn in the tissues of organisms analyzed. Although the Morrão river is considered one of the scenarios most impacted of the Santos-Cubatão estuarine system, the bioavailability of specific chemical pollutants in this work does not support this scenario, as indicated by the results found in the less impacted environments, such as Cubatão and Casqueiro rivers
Mestrado
Geologia e Recursos Naturais
Mestre em Geociências
Lee, Deborah Ellen. "An application of the choice experiment method to estimate willingness-to-pay for and guide management on estuarine recreational services." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1020239.
Full textZhang, Jisheng. "Modelling of astronomical tide and storm surge in estuary." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26090.
Full textStenström, Petter. "Exchange flows in estuaries and archipelagos." Doctoral thesis, KTH, Land and Water Resources Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3546.
Full textDifferent aspects of the exchange of water and tracersbetween adjacent coastal basins, and between the coast and thesea, are addressed. Deviations from the inviscid hydraulicprediction of flow rates and interface heights in maximaltwo-layer exchange flows due to viscous effects are quantifiedby means of non-hydrostatic, three-dimensional numericalmodeling. Simulations are made for different strait geometriesand with a time-dependent barotropic flow to determine when andwhere vertical mixing and the resulting recirculation oftracers preferentially take place (Paper I). Non-hydrostaticthree-dimensional numerical modeling is also performed to studythe variability in circulation and stratification in a tidallyinfluenced estuary. In particular, two processes that act todecrease the rate of flushing of tracers are addressedturbulent mixing and secondary circulation, i.e. circulationperpendicular to the longitudinal estuary axis (Paper II).Schemes for modeling water exchange in an archipelago, i.e. ina complex system of basins and interconnecting straits, arediscussed (Paper III). Problems relating to Bernoulliaspiration of dense water from below the sill crest,multi-layer stratification, and to some extent rotationalcontrol in parallel straits are addressed.
Methodological aspects of both three dimensional numericalmodeling and of solution of the inviscid two-layer straitexchange problem are discussed. In the three-dimensionalnumerical modeling two issues are central: (i) theimplementation of open boundary conditions that allow a meanflow to be forced from one of the boundaries, while at the sametime let barotropic and baroclinic waves be radiated out of thedomain with minimum reflection, and (ii) the implementation ofa subgrid closure scheme to calculate the vertical eddyviscosity and diffusivity coefficients locally fromresolved-scale shear and stratification.
Lemley, Daniel Alan. "Assessing symptoms of eutrophication in estuaries." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/3427.
Full textWeltmer, Micah A. "Stratified fronts in well-mixed estuaries." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37742.
Full textThe occurrence of tidal intrusion fronts in a well-mixed estuary is demonstrated through both model simulation and field observation. Strong vertical mixing in well-mixed estuaries typically does not allow for development of stratification, which is a defining feature of tidal intrusion fronts. New methodology to compute a mutual realization surface of critical width and depth from model output is described that evaluates how the geometry of a basin releases tidal inflow from the hydraulic control of an inlet and the resulting front character. Force balance relationships of these features are evaluated in three dimensions for the first time. From this, Froude angle techniques are adapted to assess and predict how the geometry controls the behavior of the front after it is formed. Intrusion fronts observed in the field do not precisely conform to the conceptual model, but a modest field validation of Froude angle usage informs an axis rotation that results in agreement with established hydraulic theory. Frontogenetic mechanisms are proposed from the observations to describe the importance of morphological complexity and water mass segregation to the occurrence of bathymetrically induced confluent subduction in a well-mixed estuary.
Quinnell, Susan Elizabeth. "Estuarine Canaries: Macrobenthos Measures Pollution when Chemical Tests Cannot." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/366573.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Donald, Ian R. "A preliminary assessment of the hydrodynamics of the Touw River and Wilderness Lakes system with emphasis on the management of the estuary mouth." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85775.
Full textENGLISH ABSTRACT: The Touw River estuary and Wilderness coastal lakes is a sensitive system from a flooding and ecological viewpoint and, therefore, careful consideration is placed on the hydrodynamics and salinity levels within the system. The estuary consists of a “temporary open/closed” estuary, where during closed mouth conditions, the sand bar at the estuary mouth is artificially managed in an attempt to reduce flood water levels in the system. The reason behind this management strategy is the construction of residential property along the flood plains of the estuary and coastal lakes, which in the past, had been exposed to regular cycles of inundation during flood events. In an attempt to reduce flood water levels in all water bodies and hence reduce the risk of inundation, a management policy was formulated. The past and present management plan is to maintain the sand bar at Touw estuary mouth, during closed mouth conditions, at an elevation of between +2.1m to +2.4m MSL, based on proposals made by the CSIR in 1981. Recent flood events, after the implementation of the management policy, still occasionally result in significant inundation of residential property, which has raised concern for some interested parties over the effectiveness of the management strategy. Furthermore, a growing concern was also evident over the long term wellbeing of the system from an ecological viewpoint. Historical data shows significant changes in salinity levels since the implementation of the management strategy which could impose negative long term effects on the system. In this study, numerical models were consequently constructed and applied in order to analyse the effectiveness of the current management policy and recalculate flood water levels under a number of proposed scenarios. Long term salinity changes were also analysed in an attempt to better understand salinity propagation throughout the system, using extreme hypothetical cases. Through the analysis of the simulation results, it was concluded that flood water levels in the Touw estuary were almost completely dependent on the size of the Touw River flood and the initial height of the sand bar at the estuary mouth. Whereas, water levels in the coastal lakes are almost entirely dependent on the quantity of runoff into the lakes and their initial water levels. The current management plan, involving only artificial manipulation of the sand bar at the estuary mouth, therefore has a fairly insignificant effect on flood water levels achieved in the coastal lakes. Furthermore, it was concluded that the construction of the preparatory channel is a vitally important aspect of the current management plan and that skimming of the sand bar alone is ineffective to completely mitigate the risk of residential inundation along the banks of the Touw River. The salinity modelling study provided a first indication of the salinity characteristics within the system. It was found that the penetration of seawater into the system was less prominent as the water bodies became further removed from the ocean and that a direct relationship was evident between the volume of direct freshwater inflow to a water body and the degree of salinity variation in that specific water body. In water bodies with high volumes of direct freshwater inflow such as the Touw estuary, a large degree of salinity variation is evident. However, in water bodies with no freshwater inflow, such as Rondevlei, salinity levels remain more stable and are less likely to fluctuate.
AFRIKAANSE OPSOMMING: Uit ‘n vloed- en ekologiese oogpunt is die Touwsriviermonding en Wilderniskusmere ‘n uiters sensitiewe stelsel en daar is dus deeglike oorweging gegee aan die hidrodinamika en soutvlakke in die stelsel. Die monding bestaan uit 'n "tydelike oop / geslote" monding, en tydens geslote mondtoestande word die sandbank by die riviermond kunsmatig beheer in 'n poging om vloedwatervlakke binne die stelsel te verminder. Die rede vir hierdie strategie is omdat baie residensiële eiendomme langs die vloedvlaktes van die monding en kusmere gebou is, wat in die verlede aan 'n gereelde siklus van oorstromings blootgestel is tydens vloede. In 'n poging om vloedwatervlakke in al die watermassas te verminder, en sodoende die risiko van oorstroming te verminder, is 'n bestuursbeleid geformuleer. In beide die vorige en die huidige bestuursplanne is die sandbank in die Touwsriviermond tydens geslote mondtoestande in stand gehou op 'n hoogte van tussen 2,1 m en 2,4 m MSL, gebaseer op die voorstelle wat deur die WNNR in 1981 gemaak is. Onlangse vloede wat plaasgevind het na die implementering van die beleid, het steeds van tyd tot tyd gelei tot noemenswaardige oorstromings van residensiële eiendomme, en kommer is uitgespreek deur 'n paar belanghebbende partye oor die doeltreffendheid van die strategie vir die bestuur. Daar is verder kommer uitgespreek oor die langtermyn welstand van die stelsel uit 'n ekologiese oogpunt. Historiese data toon 'n beduidende verandering in soutvlakke sedert die implementering van die bestuurstrategie met ‘n negatiewe langtermyn uitwerking op die stelsel. In hierdie studie is daar derhalwe numeriese modelle opgestel en toegepas ten einde die doeltreffendheid van die huidige bestuur van die beleid te bepaal, asook om die vloedvlakke te herbereken en te analiseer na aanleiding van 'n aantal voorgestelde scenario's. Langtermyn soutgehalte veranderinge is ook ontleed in 'n poging om die soutgehalte verspreiding deur die hele stelsel beter te verstaan, deur gebruik te maak van uiterste hipotetiese gevalle. Deur die ontleding van die simulasie resultate, is daar tot die gevolgtrekking gekom dat vloedwatervlakke in die Touwsrivier-monding byna heeltemal afhanklik was van die grootte van die Touwsrivier vloed en die aanvanklike hoogte van die sandbank by die riviermond. Watervlakke in die kusmere is egter byna heeltemal afhanklik van die hoeveelheid afloop na die mere en die aanvanklike watervlakke. Die huidige bestuursplan, wat slegs ‘n kunsmatige manipulasie van die sandbank by die riviermond behels, het dus 'n redelik onbeduidend invloed op die vloedwatervlakke wat in die kusmere bereik is. Daar is verder tot die gevolgtrekking gekom dat die konstruksie van die voorbereidende kanaal 'n uiters belangrike aspek van die huidige bestuursplan is, en dat die afskraping van die sandbank alleen oneffektief sou wees om die risiko van residensiële oorstroming langs die oewer van die Touwsrivier uit te skakel. Die soutgehalte modelleringstudie verskaf 'n eerste aanduiding van die soutgehalte eienskappe binne die stelsel. Daar is gevind dat die penetrasie van seewater in die stelsel minder prominent was as in die watermassas verder van die see af, en dat daar 'n duidelike direkte verband is tussen die volume van die varswater wat direk invloei na 'n watermassa en die mate van soutgehalte variasie in daardie spesifieke watermassa. In watermassas waar hoë volumes varswater direk invloei soos die Touwsrivier-monding, is 'n groot mate van soutgehalte variasie sigbaar. In die watermassas waar geen varswater invloei nie, soos die Rondevlei, bly soutvlakke meer stabiel en is minder geneig om te wissel.
Vorsatz, Jeanne Pauline. "Ecological role of estuarine brachyuran crabs in mangrove and salt marsh estuaries, Eastern Cape, South Africa." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1108.
Full textAkoto, William. "Valuing preferences for freshwater inflows into selected Western and Southern Cape estuaries." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/915.
Full textArundel, Helen Patricia, and lswan@deakin edu au. "Invertebrate larval dynamics in seasonally closed estuaries." Deakin University. School of Ecology and Environment, 2003. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20061011.142951.
Full textStirling, James R. "Dynamical system models of patchiness in estuaries." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/13623.
Full textMansi, Sadoniben E. "Heavy metals and their ecotoxicology in estuaries." Thesis, University of Essex, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426006.
Full textKogut, Megan Brook 1972. "Copper speciation in estuaries and coastal waters." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/84844.
Full textIncludes bibliographical references.
The goals of this dissertation are to better understand the sources and the Cu binding ability of ligands that control Cu toxicity in estuaries and harbors, where elevated Cu concentrations have caused documented toxic effects on microorganisms, fish, and benthic fauna. I modified and improved a commonly used approach to determine metal speciation (competitive ligand exchange adsorptive cathodic stripping voltammetry, CLE-ACSV). Using this new approach to chemical Cu speciation and an old approach to physical Cu speciation (filtration), I show that riverine humic substances, filtrable, recalcitrant and light absorbing molecules from degraded plant material, can account for all of the Cu binding in the Saco River estuary. This finding directly supports the hypothesis that terrestrial humic substances might be the most important source of Cu ligands for buffering Cu toxicity in coastal locations with freshwater inputs. However, fieldwork in coastal waters with large inputs of both Cu and suspended colloids (Boston Harbor, Narragansett Bay, and two ponds on Cape Cod) shows that some Cu present in these samples is inert to our competitive ligand exchange method for at least 48 hours. These results support the hypothesis that a significant fraction of the Cu present in these samples is physically sequestered in colloidal material, with the remaining fraction complexed by humic substances. Previous studies of Cu speciation were not able to distinguish between strongly complexed Cu and inert Cu, and our analytical approach should be used further to determine the role of colloids in Cu speciation in all natural waters.
by Megan Brook Kogut.
Ph.D .
Beck, Julia S. "Sediment transport dynamics in South African estuaries." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1465.
Full textEstuaries are complex water bodies and differ considerably from fluvial river systems. In estuaries the flow reverses regularly due to the tidal currents and flow depths depend primarily on the tides and not the flow. An estuary has two sources of sediment: the river during floods and the ocean that supplies marine sediment through littoral drift which is transported by tidal currents into the estuary. Oversimplified models cannot be used to investigate the hydrodynamics and geomorphology of an estuary due to its complexity. Sedimentation of South African estuaries has created several environmental and social problems. Sediment transport imbalances have been caused by changes in the river catchments such as increased sediment yields and flood peak attenuation due to dam construction. Historically floods used to flush estuaries to maintain the long-term sediment balance in the river-estuary system, but with reduced flood peaks, sediment transport capacities at the estuaries are reduced and flushing efficiency decreased, resulting in marine transport dominating in many estuaries. Two-dimensional (horizontal, 2DH) numerical models have been found to be appropriate tools for studying hydro- and sediment dynamics in SA estuaries. The modelling shows that the sediment balance in the estuary relies on a delicate balance between dominant flood and ebb flows. Although the models performed very well, there are still additional processes to include such as time varying roughness changes and cohesive sediments. For long-term and long reach simulations, onedimensional (or quasi-two-dimensional) models will also be required in future. Mathematical modeling can be used to simulate the flushing of sediments during floods, but attempts should be made to calibrate these models when adequate field data become available in the future. The modelling has shown that floods play a very important part in estuarine sediment transport processes. Physical modelling was undertaken of the breaching of an estuary mouth. The main aim was to illustrate the merits of breaching at higher water levels as well as to investigate the changes in the mouth during breaching. The data obtained from the experiments were used to calibrate and verify a mathematical model. Mathematical modelling of the breaching process at the Klein River estuary confirms what has been observed during numerous breachings in the field, i.e. that breaching at higher water levels and towards the southeast side is more effective. Sediment transport by both waves and currents was investigated. It was found that with increasing wave and stream power, sediment transport rates would increase if both waves and currents travelled in the same direction. In contrast, it seems that with the current direction opposing that of the waves, Hydraulics of Estuarine Sediment Transport Dynamics in South Africa iii greater wave heights resulted in lower sediment transport rates. A new sediment transport equation, based on stream power, wave power, as well as sediment size was calibrated and verified, and compared to the well-known Bijker formula.
Alkhalidi, Mohamad. "Sediment transport in sandy estuaries at equilibrium." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010108.
Full textYin, Yunzhu. "Morphodynamic response of estuaries to climate change." Thesis, Swansea University, 2018. https://cronfa.swan.ac.uk/Record/cronfa39604.
Full textOwens, Peter H. "Mathematical modelling of sediment transport in estuaries." Thesis, University of Birmingham, 1986. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618340.
Full textChege, Jedidah. "Valuing preferences for freshwater inflows into five Eastern Cape and Kwazulu-Natal estuaries." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/932.
Full textFigueirêdo, Francileide Vieira [UNESP]. "Susceptibilidade a antimicrobianos e resistência plasmidial de cepas de Salmonella spp isoladas de dois estuários do Estado do Ceará, Brasil." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/100206.
Full textCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A salmonelose é uma das doenças de origem alimentar mais freqüente e considerada uma das zoonoses mais relevantes para a saúde pública em todo o mundo. A Organização Mundial de Saúde (OMS) assinalou aumento alarmante de estirpes de Salmonella resistentes aos antibióticos devido ao seu uso abusivo em criações intensivas, especialmente nas aquícolas. Diante do exposto, o escopo deste trabalho foi o de isolar e identificar a resistência plasmidial em bactérias do gênero Salmonella, em amostras de água de dois ambientes estuarinos, um do Norte (Acaraú) e outro do Sul (Jaguaribe) do Estado do Ceará, ambos com atividades de carcinicultura. Durante sete meses, de novembro de 2006 a maio de 2007, foram coletadas 84 amostras de água dos dois estuários. A pesquisa de Salmonella seguiu a metodologia do “Bacteriological Analytical Manual”. As salmonelas foram testadas quanto à susceptibilidade a dez antimicrobianos: Ácido nalidíxico, Ampicilina, Ciprofloxacina, Ceftriazona, Cloranfenicol, Gentamicina, Imipenem, Nitrofurantoína, Sulfametoxazol e Tetraciclina. A Concentração Inibitória Mínima dos antibióticos seguiu a técnica de macrodiluição em caldo. Em atividade de base, mediu-se o pH, a temperatura e a salinidade da água. Foram confirmadas 103 cepas de Salmonella, 90 no Rio Acaraú e 13 no Rio Jaguaribe, pertencentes aos sorovares: S. Newport, S. Saintpaul, S. Panama, S. Rubislaw, S Albany, S. Anatum, S. Corvallis, S. Madelia. O Rio Acaraú apresentou-se mais contaminado do que o Rio Jaguaribe, onde foram encontradas cepas resistentes a antimicrobianos, com um percentual de 25% para resistência plasmidial, e 75% para a cromossômica. Esses resultados ressaltam dois problemas de saúde pública: a presença de cepas de Salmonella resistentes e a possibilidade de contaminação humana pelo consumo dos crustáceos. Somado a isso,...
Salmonellosis is one of the most common foodborne diseases, was considered and the most important for public health authorities throughout the world. The World Health Organization (WHO) recently drew attention to the rapid increase in Salmonella strains resistant to antibiotics employed in farming activities, especially in aquaculture. Thus, the objective of this study was to test the antimicrobial susceptibility of Salmonella strains isolated from water samples collected in the estuaries of the Acaraú and Jaguaribe rivers (respectively in the north and south of Ceará State, Brazil), both of which are subject to extensive shrimp farming. Eighty-four samples were collected between November 2006 and May 2007. The susceptibility tests were performed following the guidelines of the Bacteriological Analytical Manual (BAM). The strains were exposed to 10 different antibiotics: nalidixic acid, ampicillin, ciprofloxacin, ceftriaxone, chloramphenicol, gentamicin, imipenem, nitrofurantoin, sulfamethoxazole and tetracycline. The minimum inhibitory concentration of the antibiotics was determined with the broth macrodilution method. In base activity, mensure the factores as Temperature, salinity and pH values were registered for all water samples. One hundred three Salmonella strains were isolated (Acaraú n=90; Jaguaribe n=13) belonging to the serotypes S. Newport, S. Saintpaul, S. Panama, S. Rubislaw, S Albany, S. Anatum, S. Corvallis and S. Madelia. Thus, the Acaraú river was more severely contaminated than the Jaguaribe river, where strains resistant to antimicrobial were found in a rate of 25% to plasmid resistance and 75% to chromosomal resistance. These results show up two problems of public health: the presence of resistant strains of Salmonella and the possibility of human contamination though crustacean consumption. In addition to this,...(Complete abstract click electronic access below)
Batista, Filho Job Jesus. "A dinamica das aguas subterraneas no estuario do Rio Itanhaem, litoral sul do Estado de São Paulo." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287665.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociencias
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Resumo: O presente trabalho estuda a interferência da maré nos aqüíferos costeiros, identificando alterações hidrodinâmicas e químicas em suas águas. A pesquisa foi realizada no estuário do rio Itanhaém, em duas localidades: no Sitio de Pesquisa, com 7 poços instalados, situados às margens do rio Acima, a 3,5 km do oceano, e no CePeRio - Centro de Pesquisa do Estuário do rio Itanhaém, com 1 poço, localizado a aproximadamente 1 km do oceano. O estudo foi executado em 3 etapas, buscando-se conhecer: a geologia dos aqüíferos, suas características físicas, químicas e geométricas. Para os aspectos hidrodinâmicos, englobaram-se o monitoramento do nível d'água superficial e subterrâneo e os cálculos dos parâmetros hidrodinâmicos, como: condutividade hidráulica, velocidade média linear e transmissividade. Para a hidroquímíca foram executadas coletas periódicas, a cada 45 minutos, análise dos parâmetros físicoquímicos: temperatura, pR, Eh, condutividade elétrica (CE), sólidos totais dissolvidos (STD) e salinidade. Foram coletadas amostras em cada etapa para se an$l.lisar a composição química das águas estudadas, quantificando-se os seguintes íons: Na, K, Si, Mg, Ca, Sr, Co, Mn, Cu, P, Zn, Pb, AI, Ba, Cd, N~, Fe, Cr, RC03-, F- ,cr ,Br- ,N ,S042- e PO/- . Os aqüíferos estudados, um livre e um confmado, são compostos de sedimentos arenosos de granulometria fina. O aqüífero confinado é composto de areia com lente df. conchas calcáreas, à profundidade de 20 metros. As águas superficiais monitoradas foram: as dos rios Acima, Itanhaém e do ribeirão Campininha, que margeiam as áreas estudadas. O aqüífero livre, formado por areia fina, e o rio Acima apresentam águas sulfatadas ou cloretadas sódicas. No aqüífero, o STD varia de 40 a 70 mg/L e o pH é ácido (entre 4 e 5); no rio, o STD varia de 90 a 5.900 mgIL e o pH de 6 a 7. O aqüífero confinado, com argila siltosa na sua base e conchas calcáreas na sua estrutura, apresenta águas bicarbonatadas sódicas, com STD variando de 310 a 2.000 mg/L e pH neutro (entre 6 e 7,5). O aqüífero livre, com condutividade hidráulica (10 de 10-4 m/s, possui influência direta das oscilações da maré, com uma variação de amplitude do nível d'água (NA) 5 vezes menor que a da maré; o aqüífero confinado, com K igual a 10-6 m/s, oscila 11 vezes menos que a maré, com maior variação de 1,4 m. A direção do fluxo hidrodinâmico no aqüífero livre é para NW e a do confinado é para WSW, ambos com descarga no rio Acima. O aqüífero livre tem velocidade média linear da ordem de 10-6 m/s e transmissividade de 205 m2/dia, e o confinado 10-8 m/s e 13 m2/dia. Apenas no aqüífero livre, durante subidas fortes da maré, o fluxo hidrodinâmico se altera, derivando para o norte. Hidroquimicamente, as águas subterrâneas variam pouco com a intrusão salina. No inverno, as águas superficiais são mais salobras que em outras épocas do ano, o que está associado a fatores como: a maré mafs alta e a pluviometria reduzida
Abstract: The present work studied the influence of the tide in the coastal aquifers by identifying hydrodynamic and chemical alterations in the aquifiers. The research was carried out in the Itanhaém river estuary in two localities: in the Sitio de Pesquisa with 7 installed wells situated on the banks of the Acima river, 3,5 km from the ocean, and in the CePeRio - Center of Research ofthe ltanhaém river estuary with 1 well located approximately 1 km from the oceano The study was executed in 3 stages that studied the geologic formations of the aquifers and their physical, chemical and geometric characteristics. The hydrodynamic aspects were studied by monitoring of the superficial and underground water leveI, and hydrodynamic parameters such as hydraulical condutivity, linear average velocity and transmissivity were determined. The hydrochemical part of the research was executed with periodic collections of samples every 45 minutes and analyzed for the physical chemical parameters of temperature, pH, Eh, electric condutivity (EC), total dissolved solids (TDS) and salinity. AIso, samples were collected for each stage of the study and analyzed for the following íons: Na, K; Si, Mg, Ca, Sr, Co, Mo, Cu, P, Zn, Pb, AI, Ba, Cd, Ni, Fe, Cr, HC03-, F- ,cr ,Br- ,N ,sot e P043- . The aquifers, one phreatic and one confined,rare both composites of fine sand sediments. The confined one is a sand layer with presences of limestone shells and has a depth of 20 meters. The surface waters were also monitored in the Acima river, the Campininha brook and the Itanhaém river, which border the study area. The phreatic aquifer is formed of fine sand and with the Acima river has sodium sulfated or chlorinated and sodium bicarbonated water. In the aquifer, the TDS varied between 40 and 70 mg/L and pH was acidic (between 4 and 5). In the river, the TDS varied from 90 to 5,900 mg/L and pH was 6 to 7. The confined aquifer, with silt clay and limestone shell, had sodic bicarbonated waters with the TDS varying from 310 to 2,000 mg/L and pH neutral (between 6 and 7,5). The phreatic aquifer with hydraulical condutivity (K) 10-4 m/s had a direct influence from tidal oscillations with a variation of phreatic leveI amplitude 5 times lesser than that of the tide. The confined aquifer with K of 10-6 m/s, oscillated 11 times less than the tide for variations of larger than 1,4 m. The hydrodynamic flow direction for the phreatic aquifer was to NW and for the confined one it was for WSW, both with discharges in the Acima river. The phreatic aquifer had linear average velocity of the order of 10-6 m/s with a transmissivity of 205 m2/day and for the confined the values were 10-8 m/s and 13 m2/day. In the phreatic aquifer the hydrodynamic flow was modified during strong flows of the tide northward. Hydrochemically, the groundwater varied slightly with saline intrusion. In the winter, the river had the biggest ionic concentrations in comparison to the other seasons which were associated with factors such as the tide being higher in and the low precipitation at that time of year
Mestrado
Geologia e Recursos Naturais
Mestre em Geociências
Nizoli, Erico Casare 1983. "Partição multi-elementar tempo-espacial na interface água intersticial-sedimento em estuário tropical impactado e procedimentos químico-analíticos para análise de metais em águas salinas." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287686.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Geociências
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Resumo: Durante as últimas décadas, efluentes industriais têm sido lançados no sistema estuarino de Santos-Cubatão, onde os rios Cubatão e Morrão são os principais receptores das descargas industriais. Diversos estudos foram realizados nos sedimentos do rio Morrão, já sendo bem conhecida a geoquímica da concentração total dos elementos neste ambiente. Os elevados níveis de ferro e fósforo de origem antrópica nestes sedimentos colocam este ambiente em um patamar científico cujos processos físico-químicos dominantes ainda são desconhecidos. No presente estudo, buscou-se identificar os processos que ocorrem na partição água intersticial-sedimentos em ambientes estuarinos impactados e o papel que a alta concentração de ferro e fósforo desempenha na variabilidade geoquímica tempo-espacial desta partição. Para tanto, foram investigados a dinâmica multi-elementar nos sedimentos, nas águas intersticiais, características fisico-químicas, matéria orgânica, sulfetos volatilizados por acidificação (AVS) e metais simultaneamente extraídos (SEM), granulometria e mineralogia mensalmente durante o período de onze meses, em dois ambientes do rio Morrão, sistema estuarino de Santos-Cubatão. Adicionalmente, foi desenvolvido um dispositivo para amostragem temporal de água intersticial por equilíbrio difusivo com sistema de coleta de amostra/recarga e uma proposta de mini-coluna para extração em fase sólida para a determinação de metais por ICP-MS em águas salinas. Os resultados obtidos demonstraram que o amostrador de água intersticial por equilíbrio difusivo proposto neste estudo é adequado para o emprego em trabalhos onde se pretende coletar temporalmente água intersticial sem perturbar os sedimentos e onde há a necessidade de um maior volume de amostra, o que não pode ser conseguido empregando amostradores apresentados pela literatura com funcionamento semelhante. Os dados do estudo sobre extração em fase sólida para determinação de metais em águas salinas por ICP-MS demonstraram que a mini-coluna com resina quelante proposta neste trabalho é eficaz em remover a matriz salina, apresentando precisão e exatidão adequadas aos níveis de analito presentes nas amostras. Já os resultados obtidos no estudo sobre a partição água intersticial-sedimentos em ambientes estuarinos impactados mostraram a existência de variações geoquímicas espaço-temporais para elementos maiores, menores e traços nos sedimentos. Assinaturas geoquímicas discriminantes foram observadas entre as populações de amostras VG (sedimentos expostos durante menor maré - borda do canal) e CN (sedimentos permanentemente submersos). Foi observado ainda que os elementos estudados se agrupam (análise de componente principal - PCA) de acordo com três fontes distintas (natural, indústrias siderúrgica e de fertilizantes). Variação espacial e temporal também foi identificada para a água intersticial, indicando que a autigênese de vivianita e magnetita estão entre os principais fatores controladores dos metais na água intersticial nos diferentes ambientes. Fases secundárias sulfetos (AVS) também exercem ação controladora dos metais na interface sedimento-água intersticial. Contudo, magnetita e vivianita apresentam-se como importantes retentores de metais na fase sólida, cuja cristalização autigênica é decorrente de introdução antrópica de Fe e P em grande escala no ambiente sedimentar do estuário do rio Morrão
Abstract: During the last decades, industrial effluents have been discharged into the estuary of Santos-Cubatão, where Cubatão and Morrão rivers are the main receivers of industrial discharges. Several studies were made in sediments of Morrão River, being already well known the geochemistry of the total concentration of the elements in this environment. The high levels of iron and phosphorus of anthropogenic origin in sediments, putting the environment on a scientific level in which dominant physical and chemical processes are still unknown. In the present study, we sought to identify the processes that occur in the pore water-sediment partition in estuaries impacted and the role that the high concentration of iron and phosphorus plays in the time and spatial geochemical variability. Therefore, we investigated the multi-elemental dynamics in sediments, interstitial waters, physico-chemical, organic matter, AVS and SEM, particle size and mineralogy, monthly, during the period of eleven months, in two places of Morrão river, Santos-Cubatão estuarine system. Additionally, we developed a device for temporal sampling of interstitial water by diffusive equilibrium system with sampling/recharging and a proposal for a mini-column for solid phase extraction for the determination of metals by ICP-MS in saline waters. The results showed that the pore water sampler for diffusive equilibrium proposed in this study is suitable for employment in investigations where it is necessary to collect temporally pore water without disturbing sediment and when there is a need for a larger sample volume, which cannot be achieved by employing samplers presented in the literature that operate similarly. Data from the study of solid phase extraction for the determination of metals in saline waters by ICP-MS showed that the mini-chelating resin column proposed in this study is effective in removing the salt matrix, with adequate accuracy and precision levels of analyte present the samples. Since the results obtained in the study of the pore water-sediment partition in estuaries impacted showed the existence of spatial and temporal geochemical variations for major, minor and trace elements in sediments. Discriminant geochemical signatures were also observed among the sample populations VG (sediments exposed during low tide - canal edge) and CN (permanently submerged sediments). It was also observed that the studied elements are grouped (Principal component analysis - PCA) according to three separate sources (natural, steel and fertilizer industries). Spatial and temporal variation was also identified for the interstitial water, indicating that the authigenesis of vivianite and magnetite are the main controlling factors of metals in the pore water in different environments. Secondary sulfide phases (AVS) also exert controlling metals in the interface sediment-pore water. However, magnetite and vivianite present themselves as important scavengers of metals, which authigenic crystallization is due to anthropogenic introduction of Fe and P large-scale sedimentary environment in the Morrão estuary
Doutorado
Geologia e Recursos Naturais
Doutor em Ciências
Allison, Jeffrey Garner. "Dynamics of estuarine microphytobenthos in a shallow water sand bottom habitat." [Pensacola, Fla.] : University of West Florida, 2006. http://purl.fcla.edu/fcla/etd/WFE0000004.
Full textLima, Caroline Stefani da Silva. "Padrão de distribuição das assembleias de peixes juvenis em um estuário do semiárido do Brasil." Universidade Estadual da Paraíba, 2017. http://tede.bc.uepb.edu.br/jspui/handle/tede/2860.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Estuaries are dynamic coastal ecosystems in which the interaction between the hydrological regime and the mixing of fresh and oceanic waters creates a gradient of variables that reflect on the structure of the fish community, as well as their spatio- temporal pattern. These characteristics are used as filters, that is, determining factors that select species ecologically similar, hence producing different groups of species along an environmental gradient. These filters can act on hierarchical scales, partitioning the diversity of species within the components α (local diversity), β (variation of diversity between sites) and γ (regional diversity). Therefore, the aim of this study was to analyze the composition, structure, hierarchical partitioning and if beta diversity is determined either by turnover or nestedness of fish assemblages in the Mamanguape river estuary, influenced by hydrological changes (rainy and dry periods). The composition and structure of the estuarine fish assemblages were characterized by a few dominant species in numerical abundance and biomass, being these considered core species. In addition, abundance and diversity increased with the proximity to the ocean due to adequate salinity conditions and greater habitat availability in these areas. The catch of fish in the estuary was higher during the rainy season, related to the recruitment period of many species that coincide with the environmental changes. The Canonical Correspondence Analysis indicated salinity and chlorophyll-a as the main filters of the spatial distribution of fish assemblages, separating them along the three zones according to the osmoregulation capacity of each species and the availability of resources in the zones. In the analysis of the hierarchical partition of the fish assemblages, the dissimilarity of the species composition was higher in the upper level (β3), influenced mainly by the turnover in both hydrological periods, suggesting the importance of the environmental heterogeneity for the fish diversity in this estuary.
Estuários são ecossistemas costeiros dinâmicos cuja interação entre o regime hidrológico, entrada de água doces e oceânica cria um gradiente de variáveis ambientais que refletem na estrutura da comunidade de peixes, bem como no seu padrão de utilização espaço-temporal. Estas características ambientais podem atuar como filtros, ou seja, fatores determinantes que selecionam espécies ecologicamente similares, consequentemente produzindo diferentes grupos de espécies ao longo de um gradiente ambiental. Tais filtros podem agir em escalas hierárquicas, particionando a diversidade de espécies dentro dos componentes α (diversidade local), β (variação da diversidade entre locais) a γ (diversidade regional). Portanto, o objetivo desse estudo foi analisar a composição, estrutura, bem como, partição hierárquica e se diversidade β das assembleias de peixes é determinada por turnover ou aninhamento no estuário do rio Mamanguape – PB, influenciada pelas mudanças hidrológicas (período chuvoso e seco). A composição e estrutura das assembleias de peixes estuarinas foram representadas por poucas espécies dominantes em abundância numérica e biomassa, sendo essas considerada core species. Além disso, a abundância e diversidade aumentaram com a proximidade com o oceano, devido às condições adequadas de salinidade e maior disponibilidade de habitats nestas áreas. A captura de peixes no estuário foi maior durante o período chuvoso, relacionadas ao período de recrutamento de muitas espécies que coincidem com as mudanças ambientais. A análise de correspondência canônica indicou a salinidade e a clorofila-a como os principais filtros da distribuição espacial das assembleias de peixes, separando-as ao longo das três zonas em função da capacidade de osmorregulação de cada espécie e a disponibilidade de recursos nas zonas. Na análise da partição hierárquica das assembleias de peixes, a dissimilaridade da composição de espécies foi maior no nível superior (β), influenciada principalmente pelo turnover em ambos os períodos hidrológicos, sugerindo a importância da heterogeneidade ambiental para a diversidade de peixes nesse estuário.
Vosloo, Mathys Christiaan. "Network analysis of trophic linkages in two sub-tropical estuaries along the South-East coast of South Africa." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1010966.
Full textLandin, Charles Melchor. "Dissolved gaseous mercury behavior in shallow water estuaries." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2098.
Full textConrad, Sarah. "Origin of Iron Isotope Signatures in Boreal Estuaries." Licentiate thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17896.
Full textGodkänd; 2014; 20141119 (sarcon); Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Sarah Conrad Ämne: Tillämpad geologi/Applied Geology Uppsats: Origin of Iron Isotope Signatures in Boreal Estuaries Examinator: Professor Johan Ingri, Institutionen förs amhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: Professor Magnus Mörth, Institutionen för geologiska vetenskaper, Stockholms Universitet Tid: Onsdag den 17 december 2014 kl 10.00 Plats: F531, Luleå tekniska universitet
Claus, Sonia Carmel, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "Heavy metals in biota from temperate Australian estuaries." THESIS_CSTE_SFH_Claus_S.xml, 2003. http://handle.uws.edu.au:8081/1959.7/503.
Full textDoctor of Philosophy (PhD)
Claus, Sonia Carmel. "Heavy metals in biota from temperate Australian estuaries /." View thesis, 2003. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20051013.092820/index.html.
Full text"Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Western Sydney Hawlesbury" Bibliography : leaves 245-278.
Turner, Andrew. "Chemical dynamics in North Sea estuaries and plumes." Thesis, University of Plymouth, 1990. http://hdl.handle.net/10026.1/1684.
Full textTyler, Andrew O. "The distribution and reactivity of organochlorines in estuaries." Thesis, University of Plymouth, 1999. http://hdl.handle.net/10026.1/1673.
Full textWhyte, Kenneth K. "Entrainment and mixing in rivers, estuaries and reservoirs." Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400129.
Full textErnstberger, Helmut Hans. "The fate of terrestrially derived phosphorus in estuaries." Thesis, University of Aberdeen, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287622.
Full textComber, Sean David William. "The biochemical control of arsenic in certain estuaries." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280907.
Full textRuhl, Nathan A. "The Lotic-Lentic Gradient in Reservoirs and Estuaries." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1339177201.
Full textPatra, Rashmi Ranjan. "Sediment management in low-energy estuaries Loxahatchee, Florida /." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0002800.
Full textTodeschini, Ilaria. "Long-term morphological response of tide dominated estuaries." Doctoral thesis, Università degli studi di Trento, 2006. https://hdl.handle.net/11572/368383.
Full textTodeschini, Ilaria. "Long-term morphological response of tide dominated estuaries." Doctoral thesis, University of Trento, 2006. http://eprints-phd.biblio.unitn.it/614/1/Todeschini_Tesi_Dottorato.pdf.
Full textCappuci, Sergio. "The stability and evolution of an intertidal flat in Venice Lagoon, Italy." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250074.
Full textCowie, Meredith. "Environmental flows, health and importance of macrophytes in the estuaries of water management area 11." Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/7930.
Full textFigueirêdo, Francileide Vieira. "Susceptibilidade a antimicrobianos e resistência plasmidial de cepas de Salmonella spp isoladas de dois estuários do Estado do Ceará, Brasil /." Jaboticabal : [s.n.], 2008. http://hdl.handle.net/11449/100206.
Full textAbstract: Salmonellosis is one of the most common foodborne diseases, was considered and the most important for public health authorities throughout the world. The World Health Organization (WHO) recently drew attention to the rapid increase in Salmonella strains resistant to antibiotics employed in farming activities, especially in aquaculture. Thus, the objective of this study was to test the antimicrobial susceptibility of Salmonella strains isolated from water samples collected in the estuaries of the Acaraú and Jaguaribe rivers (respectively in the north and south of Ceará State, Brazil), both of which are subject to extensive shrimp farming. Eighty-four samples were collected between November 2006 and May 2007. The susceptibility tests were performed following the guidelines of the Bacteriological Analytical Manual (BAM). The strains were exposed to 10 different antibiotics: nalidixic acid, ampicillin, ciprofloxacin, ceftriaxone, chloramphenicol, gentamicin, imipenem, nitrofurantoin, sulfamethoxazole and tetracycline. The minimum inhibitory concentration of the antibiotics was determined with the broth macrodilution method. In base activity, mensure the factores as Temperature, salinity and pH values were registered for all water samples. One hundred three Salmonella strains were isolated (Acaraú n=90; Jaguaribe n=13) belonging to the serotypes S. Newport, S. Saintpaul, S. Panama, S. Rubislaw, S Albany, S. Anatum, S. Corvallis and S. Madelia. Thus, the Acaraú river was more severely contaminated than the Jaguaribe river, where strains resistant to antimicrobial were found in a rate of 25% to plasmid resistance and 75% to chromosomal resistance. These results show up two problems of public health: the presence of resistant strains of Salmonella and the possibility of human contamination though crustacean consumption. In addition to this,...(Complete abstract click electronic access below)
Orientador: Julieta Rodini Engracia de Moraes
Coorientador: Regine H. S. dos Fernandes Vieira
Banca: Fabiana Pilarski
Banca: Angela Cleusa de Fátima Banzatto de Carvalho
Banca: Gilson Pereira de Oliveira
Banca: Fabiana Rizzi Bozzo
Doutor
Terörde, Anja Isabel. "Variation in the use of intermittently open estuaries by birds : a study of four estuaries in the Eastern Cape, South Africa." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/6209.
Full textIncludes bibliographical references (leaves 87-99).
The main objective of this study was to describe the use of intermittently open estuaries (IOEs) along a section of the Eastern Cape coast by waterbirds, and the factors that influence avifaunal community composition in space and time. The study area consisted of four IOEs of varying sizes within a 40 km stretch of coastline in the warm temperate coastal biogeographical region of South Africa.