Dissertations / Theses on the topic 'Estuarine systems'
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Sutherland, John David Wightman. "'Hidden' arsenic in estuarine systems." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326789.
Full textCianfaglione, Kevin. "Plant landscape and models of French Atlantic estuarine systems." Thesis, Brest, 2018. http://www.theses.fr/2018BRES0092/document.
Full textEstuaries generally include a wide mosaic of natural and semi-natural habitats. The objective of this thesis is to study the vegetation and Plant Landscape of French Atlantic estuarine Systems, trying to understand the functioning and the plant distribution patterns. The present study tries to carry out a theoretical common model of functioning and ecological gradients, in order to make a basis to improve their classification and ecological studies, and to Help the monitoring and assessment of land uses, land forms transformation and human impacts : developping a spatio-temporal predictive model based on actual and potential vegetation, using the dynamico-catenal approach.The study area corresponds to the Atlantic French estuaries. In 8 selected estuaries, we undertook fieldworks for a total of 98315 ha, highlighting 2 vegetation series and 4 geopermaseries, corresponding to 131 plant associations, 60 alliances, 43 ordos and 28 classes. We mapped the vegetation of three representative estuaries for a total of 74433 ha. A synthetic scheme of estuary vegetation landscape is proposed, integrating geographical and ecological gradients as well as geomorphologic forms
Reeves, Alison Dawn. "The distribution and behaviour of lignin in the estuarine environment." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237510.
Full textZhao, Jin Bo. "Transformations of organic and inorganic phosphorus in estuarine particle-water systems." Thesis, University of Plymouth, 2009. http://hdl.handle.net/10026.1/1791.
Full textFilimonova, Valentina. "The effects of anthropogenic stressors on the food quality in estuarine systems." Doctoral thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/17770.
Full textDe um modo geral, os poluentes constituem uma ameaça para os ecossistemas aquáticos, originando grande preocupação nas entidades responsáveis pela gestão destas áreas. Por exemplo, o uso intensivo e continuado de poluentes em áreas agrícolas, perto de zonas húmidas costeiras, como o estuário do Mondego (Portugal), levou à execução de programas de monitorização, ao longo dos últimos 20 anos, para proteger e recuperar este sistema aquático. De acordo com informações recentes, obtidas junto de cooperativas agrícolas do vale do Mondego, Primextra® Gold TZ é o herbicida mais utilizado em campos de cultura de milho, sendo um dos 20 herbicidas mais vendidos em Portugal. Por outro lado, o cobre é largamente utilizado na formulação de pesticidas. A avaliação ecológica e de risco têm sido rotineiramente focadas na exposição individual de substâncias químicas, o que pode subestimar os riscos associados à ação tóxica de misturas. Assim, os potenciais efeitos sinergísticos, que podem levar a consequências mais graves e imprevisíveis para os ecossistemas estuarinos e marinhos, são subestimados. Apesar do recente aumento do número de estudos relacionados com a toxicidade de misturas de contaminantes orgânicos (grupo de pesticidas) e de contaminantes inorgânicos (grupo de metais), há ainda falta de informação científica sobre os efeitos destas misturas. A avaliação de risco ambiental normalmente tem como objetivo estudar os efeitos de contaminantes em endpoints, como a sobrevivência, o crescimento ou a reprodução, uma vez que a quantidade de biomassa disponível tem efeitos importantes sobre os níveis tróficos subsequentes e o funcionamento global do ecossistema. No entanto, um aspeto muitas vezes esquecido é a qualidade do alimento disponível, que tem implicações importantes na transferência de energia e de nutrientes ao longo da cadeia trófica. Portanto, para melhor compreender os efeitos das perturbações antrópicas, são necessários mais estudos sobre o efeito de mistura de substâncias orgânica-inorgânica na qualidade do alimento de espécies aquáticas não-alvo. Assim, este trabalho visa determinar os efeitos do herbicida Primextra® e do cobre, usados individualmente e em mistura, sobre a qualidade alimentar em sistemas estuarinos, considerando as respostas populacionais e bioquímicas nutricionais de organismos chave não-alvo: a diatomácea marinha (Thalassiosira weissflogii) e o copépode estuarino calanoide (Acartia tonsa). As diatomáceas como os copépodes são grupos dominantes na comunidade planctónica no estuário do Mondego, constituindo uma cadeia trófica simples: produtor primário –consumidor primário. Foram também usados náuplios de uma terceira espécie (Artemia franciscana) para determinar os efeitos tóxicos e bioquímicos individuais de ambos os poluentes e para comparar as suas respostas com as das outras duas espécies planctónicas Para isso foram desenvolvidos ensaios de toxicidade, envolvendo exposições a substâncias químicas individuais e a misturas equitóxicas, para obtenção e modelação de dados bioquímicos indicadores da qualidade alimentar: teor de ácidos gordos (FA), incluindo ácidos gordos essenciais, teor de proteína e teor de substâncias reativas de ácido tiobarbitúrico (TBARS). Esta escolha baseou-se no facto dos ácidos gordos serem uma das mais importantes moléculas transferidas através da cadeia trófica, em teias alimentares aquáticas, podendo ser usados como um bom indicador de stress. Os resultados mostraram que T. weissflogii foi a espécie mais sensível ao herbicida seguida por A. tonsa (CE50 = 0,008 mg / L e CE50 = 0,925 mg / L, respetivamente), enquanto o copépode foi a espécie mais sensível ao metal, seguido por T. weissflogii (CE50 = 0,234 mg / L e CE50 = 0,383 mg / L, respetivamente). A análise estatística dos efeitos da mistura metal-herbicida sustentou um efeito sinergístico significativo sobre a sobrevivência do copépode (relativamente ao modelo de ação independente), e um efeito significativamente antagonístico sobre o crescimento da diatomácea (relativamente ao modelo de adição de concentração). A composição em ácidos gordos das espécies zooplanctónicas respondeu com elevada sensibilidade aos dois tipos de exposição (individual e de mistura),tendo-se observado o efeito mais nocivo na concentração de ácidos gordos essenciais de A. tonsa após a exposição à mistura de metal-herbicida: o seu valor diminuiu significativamente (5 vezes) em comparação com o controlo. Os resultados dos modelos lineares generalizados, baseados na variação da composição bioquímica (total de FA, FA essenciais, teor de proteína e TBARS), para as substâncias individuais e para a mistura, revelaram que os efeitos desta foram não-aditivos, para o conteúdo de FA essenciais de ambas as espécies planctónicas. Já a qualidade alimentar de A. tonsa (consumidor primário) foi mais sensível aos stressors químicos comparativamente a T. weissflogii (produtor), quando as duas espécies foram expostas a níveis iguais de contaminação. O presente estudo sugere que a exposição simultânea a um metal e a um herbicida pode afetar negativamente a qualidade alimentar de espécies planctónicas, em diferentes níveis tróficos. Esse efeito pode, potencialmente, ser transferido para níveis tróficos superiores e causar alterações importantes no fluxo de energia através do sistema estuarino e, posteriormente, para a dieta humana.
Contaminants constitute a threat to aquatic communities and, thus to aquatic ecosystems. Pesticides are widely used to control pests and diseases in crop production. Among these agrochemicals, herbicides are commonly applied on crops to control adventive infestations. Thus, the intensive usage of pollutants in agriculture areas near ecological coastal wetlands led to the implementation of the Pesticide-Monitoring programs to recover aquatic systems, such as in the Mondego estuary, Portugal, since 1998. Nowadays, and according to the information from agricultural cooperatives of Mondego valley, the herbicide Primextra® Gold TZ is the herbicide most used in corn crops fields and is one of the 20 best-selling herbicides in Portugal, whereas copper is mainly used in pesticide`s formulation. Traditional effect and risk assessment have been routinely focused on exposures to single chemicals, which may underestimate the risks associated with toxic action of mixtures. Thus, the potential synergistic effects that may lead to more severe and unpredictable consequences for estuarine and marine ecosystems are ignored. Recently, there are an increasing number of studies dealing with toxicity of mixtures of either organic contaminants (group of pesticides) or inorganic contaminants (group of metals). However, studies with mixture experiments of metals and pesticides still remain scarce. Furthermore, environmental risk assessment typically aims to study the effects of contaminants on endpoints such as survival, growth or reproduction, since the available quantity of the biomass has important effects on the subsequent trophic levels and the overall ecosystem functioning. However, an often overlooked aspect of food availability is food quality, which has important implications on the energy and nutrient transfer through the food web. Further information about the effect of organic-inorganic mixture on the food quality of aquatic organisms, which are typical non-target species for these contaminants, is needed. This research aims to determine the effects of anthropogenic stressors on the food quality in estuarine systems by means of both, individual and mixture exposures, to the herbicide Primextra® and the metal copper, on the toxicity and nutritionally important biochemical parameters of key non-target organisms: a marine diatom (e.g. Thalassiosira weissflogii) and a estuarine calanoid copepod (e.g. Acartia tonsa) – both are dominant plankton groups in the Mondego estuary, constituting simple trophic food chain: primary producer – primary consumer. A third species, the brine shrimp Artemia franciscana (nauplii), was also added to the study to determine toxic and biochemical individual effects of both pollutants and to compare its response with the two other planktonic species. In this study a joint approach was applied, i.e. controlled laboratory experiments (toxicity tests and microcosm bioassays), involving single and equitoxic mixture exposures to chemical stressors combined with the further modelling of the obtained biochemical data: fatty acids (FA) content, including the essential FA, protein content and content of thiobarbituric acid reacting substances (TBARS) as important indicators of the food quality. Moreover, fatty acids are one of the most important molecules transferred across the plant-animal interface in aquatic food webs and can be used as good indicators of stress. The conducted lab incubations showed that T. weissflogii was the most sensitive species to the herbicide followed by A. tonsa (EC50 = 0.008 mg/L and EC50 = 0.925 mg/L, respectively), whereas the copepod was the most sensitive species to the metal in comparison to T. weissflogii (EC50 = 0.234 mg/L and EC50 = 0.383 mg/L, respectively). The statistical analysis of mixture effects revealed that the metal-herbicide mixture acted significantly synergistic on the copepod survival (relatively to the independent action model), while acted significantly antagonistic on the diatom growth (relatively to the concentration addition model). FA composition of zooplanktonic species responded with higher sensitivity to both, the individual and mixture exposures with the most harmful effect on the essential FA of A. tonsa after exposure to the metal-herbicide mixture: their amount significantly decreased (5 times) compared to the uncontaminated treatment. The results of the generalized linear models fitted to the experimentally observed responses of biochemical composition (total FA, essential FA, protein and TBARS contents) to the single substances and the mixture revealed that effects of the copper-Primextra® mixture were non-additive for the essential FA content of both planktonic species. They further showed that the food quality of the species from higher trophic level, i.e. primary consumer A. tonsa was more sensitive to the chemical stressors than for the primary producer T. weissflogii, when species were exposed to the equal levels of contamination. The study concludes that simultaneous exposure to metal and pesticide contaminants adversely affect the food quality of planktonic species at different trophic levels and this can potentially be transferred to higher trophic levels and cause important implications for the energy flow through the estuarine system and subsequently the human diet.
Verontreinigingen vormen een bedreiging voor in het water levende gemeenschappen en daarom ook voor aquatische ecosystemen. Pesticiden worden op grote schaal gebruikt om ziekten en plagen in de plantaardige productie te controleren. Onder deze landbouwchemicaliën, worden herbiciden vaak toegepast op gewassen om adventive besmettingen te controleren. Zo heeft het intensief gebruik van verontreinigende stoffen in landbouwgebieden in de buurt van ecologische wetlands geleid tot de uitvoering van Pesticide-Monitoring-programma's sinds 1998 om aquatische systemen, zoals in het Mondego estuarium (Portugal) te herstellen. Op basis van de huidige informatie uit agrarische coöperaties van de Mondego-vallei blijkt dat de herbicide Primextra® Gold TZ de meest gebruikte herbicide is in maïsvelden en dat het één van de 20 best verkopende herbiciden in Portugal is waarbij koper het voornaamste element van de samenstelling vormt. Traditionele effect- en risicobeoordeling zijn routinematig gericht op blootstelling aan enkele chemische stoffen, die de risico's van de toxische werking van mengsels kunnen onderschatten. Zo worden de potentiële synergetische effecten die kunnen leiden tot meer ernstige en onvoorspelbare gevolgen voor estuariene en mariene ecosystemen genegeerd. Recent zijn er een toenemend aantal studies gebeurd die toxiciteit van mengsels van ofwel organische verontreinigingen (groep pesticiden) of anorganische verontreinigingen (groep metalen) onderzoeken. Studies met mengselexperimenten van metalen en pesticiden zijn nog steeds schaars. Bovendien heeft milieurisicobeoordeling typisch tot doel om de effecten van contaminanten op eindpunten zoals overleving, groei of reproductie te bestuderen, omdat de beschikbare hoeveelheid biomassa belangrijke gevolgen heeft voor de hogere trofische niveaus en het algemeen functioneren van het ecosysteem. Echter, een vaak vergeten aspect van de voedselbeschikbaarheid is de kwaliteit van het voedsel, wat belangrijke gevolgen kan hebben voor de energie- en voedingsstoffenoverdracht in de voedselketen. Verdere informatie over het effect van de organische-anorganische mengsel op de voedselkwaliteit van het aquatische organismen, die vaak geen doelsoorten voor deze verontreinigingen zijn, is daarom noodzakelijk. Dit onderzoek heeft tot doel de effecten van antropogene stressoren op de voedselkwaliteit in estuariene systemen te bepalen door middel van blootstelling aan zowel individuele concentraties als mengsels van herbicide Primextra® en het metaal koper, op de toxiciteit en de nutritioneel relevante biochemische parameters van belangrijke non-target organismen: een mariene diatomee (bijv Thalassiosira weissflogii) en een estuariene calanoid copepod (bijv Acartia tonsa) - beide zijn één van de belangrijkste planktongroepen in de Mondego estuarium, die een eenvoudig trofische voedselketen voorstellen tussen primaire producent en primaire consument. Een derde soort, (de nauplii van) Artemia franciscana, werd ook toegevoegd aan de studie om de toxische en biochemische individuele effecten van beide polluenten te bepalen en om zijn respons te vergelijken met de twee andere planktonsoorten. In deze studie werd een gezamenlijke aanpak toegepast waanbij laboratoriumexperimenten (toxiciteitstesten en microcosmos bioassays), met blootstelling aan één of aan een equitoxische mengsel van chemische stressoren, werden gecombineerd met het verder modellering van de verkregen biochemische data: vetzuren, met bijzondere aandacht voor essentiële vetzuren, eiwitgehalte en de inhoud van thiobarbituurzuur reagerende stoffen (TBARS) als belangrijke indicatoren voor voedselkwaliteit. Daarenboven zijn vetzuren één van de belangrijkste moleculen overgedragen aan de plant-dier interface in aquatische voedselwebben en kunnen ze gebruikt worden als goede indicatoren van stress. De uitgevoerde labincubaties toonden dat T. weissflogii de meest gevoelige soort was voor de herbicide gevolgd door A. tonsa (EC50 = 0.008 mg / L en EC50 = 0.925 mg / L, respectievelijk), terwijl de copepoden het meest gevoelig waren voor het metaal tenopzichte van T. weissflogii (EC50 = 0.234 mg / L en EC50 = 0.383 mg / L respectievelijk). De statistische analyse van mengseleffecten bewees dat het metaal-herbicide mengsel significant synergistisch werkte op de overleving van de copepoden (ten opzichte van de onafhankelijke actiemodel), terwijl significante antagonistische effecten op de diatomeeëngroei optraden (ten opzichte van de concentratieadditiemodel). FA samenstelling van de zooplanktonische soorten reageerde met een hogere gevoeligheid op beide, individuele en mengsel, blootstellingen met de meest schadelijke gevolgen voor de essentiële vetzuren van A. tonsa na blootstelling aan het metaal-herbicide mengsel: de vetzuurconcentratie daalde aanzienlijk (tot 5 maal) ten opzichte van de onbesmette behandeling. De resultaten van de gegeneraliseerde lineaire modellen toegepast op de experimenteel waargenomen responsen van biochemische samenstelling (totale vetzuren, essentiële vetzuren, eiwit- en TBARS concentraties) tenopzichte van de afzonderlijke stoffen en van het mengsel toonden aan dat effecten van het koper-Primextra® mengsel niet additief waren voor de concentratie van de essentiële vetzuren van beide planktonische soorten. Verder bleek de voedselkwaliteit van de soort op het hoger trofisch niveau, namelijk de primaire consument A. tonsa, gevoeliger te zijn voor de chemische stressoren dan de primaire producent T. weissflogii, wanneer soorten werden blootgesteld aan gelijke verontreinigingsniveaus. De studie concludeert dat gelijktijdige blootstelling aan metalen en pesticiden verontreinigingen een negatieve invloed heeft op de voedselkwaliteit van planktonische soorten op verschillende trofische niveaus en dit kan mogelijk worden overgedragen naar hogere trofische niveaus met belangrijke gevolgen voor de energiestroom door het estuariene systeem en vervolgens ook voor het menselijke dieet.
Schacht, Christie, and n/a. "The Quantification of Estuarine Suspended Sediment Dynamics: A Drogue's Perspective." Griffith University. School of Engineering, 2006. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20070201.144830.
Full textSchacht, Christie. "The Quantification of Estuarine Suspended Sediment Dynamics: A Drogue's Perspective." Thesis, Griffith University, 2006. http://hdl.handle.net/10072/365295.
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Doctor of Philosophy (PhD)
School of Engineering
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Hyde, Nate. "Towards national estuarine modeling and characterization/classification systems : a pilot study for Coos Bay /." Full text open access at:, 2007. http://content.ohsu.edu/u?/etd,233.
Full textMaxey, Johnathan Daniel. "Shedding Light on the Estuarine Coastal Filter: The Relative Importance of Benthic Macroalgae in Shallow Photic Systems." W&M ScholarWorks, 2012. https://scholarworks.wm.edu/etd/1539617924.
Full textJoseph, Gilbert. "A comparative study of the chemical composition of soils from aquaculture systems in the Cochin estuarine area." Thesis, Central Marine Fisheries Research Institute, 1985. http://eprints.cmfri.org.in/11071/1/Joseph%20Gilbert%20P.%20G..pdf.
Full textLoh, Ai Ning. "Chemical, isotopic and microbial characterization of dissolved and particulate organic matter in estuarine, coastal and open ocean systems." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539791565.
Full textDellapenna, Timothy M. "Fine-scale strata formation in biologically and physically dominated estuarine systems within the lower Chesapeake and York River subestuary." W&M ScholarWorks, 1999. https://scholarworks.wm.edu/etd/1539616630.
Full textHurst, Matthew Paul. "Physical and chemical speciation of trace metals in estuarine and shelf water systems : San Francisco Bay, Gulf of the Farallones, and the Bering Sea /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2005. http://uclibs.org/PID/11984.
Full textWasserman, Ryan. "The importance of estuarine head waters for fishes in selected Eastern Cape systems, with particular emphasis on the influence of freshwater inflow, migration barriers and non-native predators on the juvenile and small fish component." Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1457.
Full textHerbeck, Lucia [Verfasser], Daniela [Akademischer Betreuer] Unger, Kai [Akademischer Betreuer] Bischof, and Tim [Akademischer Betreuer] Jennerjahn. "Ecological impact of land-derived anthropogenic nutrients and organic matter on tropical estuarine and coastal systems of Hainan, China / Lucia Herbeck. Gutachter: Kai Bischof ; Tim Jennerjahn. Betreuer: Daniela Unger." Bremen : Staats- und Universitätsbibliothek Bremen, 2012. http://d-nb.info/1071992678/34.
Full textPinto, Samara Macedo. "Mudan?as a longo prazo na comunidade de peixes de uma ba?a tropical do sudeste do Brasil (1987-2013): perda gradativa da biodiversidade da zona interna para zona externa." Universidade Federal Rural do Rio de Janeiro, 2015. https://tede.ufrrj.br/jspui/handle/jspui/1754.
Full textMade available in DSpace on 2017-06-08T13:33:20Z (GMT). No. of bitstreams: 1 2015 - Samara Macedo Pinto.pdf: 970121 bytes, checksum: f69dfd12be8357633a632969c91a1d3a (MD5) Previous issue date: 2015-05-28
Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
Fish communities in developing countries have, in many cases, showed a decrease in the species richness and abundance over time as a result of anthropogenic impacts. We analyzed fish communities of three zones (inner, middle and outer) of the Sepetiba Bay (Southeastern Brazil) using identical sampling methods (bottom trawl) during four different time periods: 1987?1988; 1993?1995; 1998?2001 and 2012?2013. A total of 33,140 fish representing 127 species in 88 genera and 41 families were recorded. Our results revealed highly significant and consistent differences in the fish community structure among the bay zones, and a decreased in the fish richness and abundance over the time period. Changes in fish richness and abundance were related mostly to a sharp decrease that occurred in the inner bay zone, the most impacted bay area, and, to a lesser extent, in the middle zone between the two first (1987?1988 and 1993?1995) and the two latter time periods (1998?2001 and 2012?2013), whereas the outer zone remained comparatively stable over time. Spatial changes in the fish community structure among the bay zones were related to differences in salinity, transparency and depth with this latter variable, together with other factors, acting as a buffer for stabalizing community changes; however, these environmental variables explained little of the variation in the temporal changes. The most important changes over time in abundant species were the numerical decreases of the Ariid Cathorops spixii, the serranid Diplectrum radiale and sciaenid Cynoscion leiarchus, and increases of the sciaenid Micropogonias furnieri and the marine catfish Genidens genidens, with this latter species restricted to the inner and middle zones. This study adds long-term information on gradual fish community changes along spatial gradients of environmental and anthropogenic influences in embayment systems. It is perhaps timely to link conservation and management planning with historical information to protect fish biodiversity in tropical developing countries
As comunidades de peixes em pa?ses em desenvolvimento, em muitos casos, mostram uma diminui??o na riqueza e abund?ncia das esp?cies ao longo do tempo como resultado das evid?ncias dos impactos antropog?nicos. N?s analisamos as comunidades de peixes ao longo de tr?s zonas (interna, central e externa) da Ba?a de Sepetiba (Sudeste do Brasil), utilizando m?todos id?nticos de amostragem (bottom trawl) de peixes durante quatro per?odos temporais diferentes: 1987?1988; 1993?1995; 1998?2001 e 2012?2013. Registrou-se um total de 33.140 peixes representando 127 esp?cies em 88 g?neros e 41 fam?lias. Nossos resultados revelaram diferen?as altamente significativas e consistentes na estrutura da comunidade de peixes entre as zonas da ba?a e uma diminui??o na riqueza de esp?cies e abund?ncia ao longo do per?odo de estudo. As mudan?as na riqueza de esp?cies e abund?ncia foram relacionadas, principalmente, ? uma forte queda que ocorreu na zona interna da ba?a, ?rea esta mais afetada e, em menor medida, na zona central entre os dois primeiros (1987?1988 e 1993?1995) e os ?ltimos dois per?odos temporais (1998?2001 e 2012?2013), enquanto a zona exterior permaneceu relativamente est?vel ao longo do tempo. Mudan?as espaciais na estrutura da comunidade de peixes entre as zonas da ba?a foram relacionadas ?s diferen?as de salinidade, transpar?ncia e profundidade com este ?ltima vari?vel, em conjunto com outros fatores, atuando como um ?buffer? estabilizando mudan?as na comunidade; no entanto, essas vari?veis ambientais explicaram pouco a varia??o nas mudan?as temporais. As mudan?as mais importantes ao longo do tempo em esp?cies abundantes foi a diminui??o num?rica do Ariideo Cathorops spixii, do Serran?deo Diplectrum radiale e do Sciaen?deo Cynoscion leiarchus, e o aumento do Sciaen?deo Micropogonias furnieri e o bagre marinho Genidens genidens, com esta ?ltima esp?cie restrita ?s zonas interna e central. Este estudo acrescenta informa??o de longo prazo sobre mudan?as graduais nas comunidades de peixes ao longo de gradientes espaciais com influ?ncias ambientais e antr?picas no sistema de ba?a. Talvez seja oportuno vincular conserva??o e planejamento de gest?o com informa??es hist?ricas para proteger a biodiversidade de peixes em pa?ses tropicais em desenvolvimento.
Laneville, Michael Warren. "Subsurface Depositional Systems Analysis of the Cambrian Eau Claire Formation in Western Ohio." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu154220482332536.
Full textBállico, Manoela Bettarel. "Análise de fácies e sequências deposicionais em sistemas continentais e estuarinos do topo da Formação Tombador, Mesoproterozoico, Chapada Diamantina, Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/75668.
Full textThe Mesoproterozoic Tombador Formation encompasses different depositional systems deposited in a sag basin, ranging from estuarine to alluvial. The well preserved deposits and their wide occurrence in the regional scale (~300 km) define the Tombador Formation as an excellent case study for the depositional patterns prevailing during the Proterozoic. Three depositional sequences were recognized for the Upper Tombador Formation, bounded by three semi-regional scale unconformities. Sequence I is composed of shallow, gravel-bed braided channels at its base, which are overlain by fine- to coarse-grained sandstones related to aeolian sand sheets and dunes and intermediate sheetfloods. The lower boundary of this sequence is characterized by an angular unconformity cutting fluvio-estuarine deposits, evidenced by an abrupt change of facies and fluvial palaeocurrents. The fluvio-estuarine deposits below the sequence boundary display palaeocurrents to northwest, whereas the fluvial strata above the unconformity show southeastward palaeocurrents. A new abrupt entrance of conglomeratic deposits related to alluvial fans systems overlying the fluvio-aeolian successions marks the lower boundary of Sequence II. The Sequence III is characterized by fluvio-estuarine systems in the top of the Upper Tombador Formation, that are progressively covered by shallow marine systems (Caboclo Formation), defining a general transgressive trend. The pattern of sequences I and II probably reflects the uplift of source areas in response to tectonic movements. The palaeocurrent change in Sequence I indicates a regional rearrangement of the drainage networks, while the alluvial fan systems of sequence II suggest sin-depositional tectonic pulses. The regional erosive surface between sequences II and III reveals a significant hiatus close to the Tombador Formation top, what suggests a tectonic origin for this unconformity.
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.
Quinn, Niall. "Forecasting of ocean state in a complex estuarine environment : the Solent-Southampton Water Estuarine System." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/359671/.
Full textTrevizani, Tailisi Hoppe. "Bioacumulação e biomagnificação de metais pesados em teias tróficas de estuários do sul-sudeste do Brasil." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/21/21137/tde-01022019-141450/.
Full textThe coastal region of Brazil is historically impacted by anthropic activities, which release contaminants such as heavy metals. In the estuaries of Paranaguá (PR), Cananéia and Santos (SP), these activities are present in different levels. In the present study, concentrations of arsenic, cadmium, lead, copper, chromium, nickel, selenium, zinc and mercury were investigated, as well as stable carbon and nitrogen isotopes in sediments, plant fragments and marine organisms such as benthic invertebrates, benthivorous fish and marine mammals, collected in the three estuaries. Samples were collected in 2015, with isotope analysis performed by EA-IRMS and heavy metal analysis performed by ICP OES-VGA and ICP-MS. Isotopic ratios allowed the distinction between organic matter sources and trophic level. The specimens of the ichthyofauna and cetaceans analyzed did not present distinction between trophic levels 3 and 4, indicating a generalist diet for these animals and a potential sharing of trophic niche. The metals have presented higher concentrations in the sediments from Santos estuary, what coincides with the place with greater intensity of anthropic activities. Comparing the estuaries, there is more bioaccumulation of Cr, Cu, Zn and Hg in Paranaguá, As and Pb in Cananéia, and Cd, Ni and Se in Santos; results which are justified by anthropic activities, natural sources and geochemical characteristics of each region. A biomagnification tendency of Se was observed in the trophic webs of all estuaries, and Zn and Hg in the Paranaguá\'s and Cananéia\'s webs. However, As, Cr, Cu, Ni and Pb displayed a tendency to biodilution in the studied trophic webs; with a higher bioaccumulation in benthic invertebrates. Therefore this study provides a current overview of the spatial and trophic distribution of heavy metals in the estuaries. Thus, it is collaborating with the monitoring and actions of coastal management.
Sámano, Celorio María Luisa. "Desarrollo e integración de modelos numéricos de calidad del agua en un Sistema de Información Geográfica." Doctoral thesis, Universidad de Cantabria, 2011. http://hdl.handle.net/10803/35687.
Full textThis thesis tackles the development of a water quality model devoted to priority and hazardous substances considering, as well, the effects derived from the sedimentary dynamics with the aim to simplify the management of estuarine areas. Moreover, with the aim to integrate this model into a Geographical Information System, the required methodological procedures are established. The combination of both tasks will allow the integration of the benefits from both tools within a unique environment that will allow the discharges management providing technical answers taking into consideration the legislative requirements.
Libardoni, Bruno Guides. "Inventory of carbon in a subtropical estuarine system." reponame:Repositório Institucional da UFPR, 2014. http://hdl.handle.net/1884/37494.
Full textDissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências da Terra, Programa de Pós-Graduação em Sistemas Costeiros e Oceânicos. Defesa: Pontal do Paraná, 05/02/2014
Inclui bibliografia
Resumo: As variações das fontes de carbono orgânico e suas variações espaciais são importantes para compreender o balanço das diferentes formas de carbono orgânico nas regiões costeiras. Amostragens foram feitas ao longo de gradientes de salinidade e nas duas desembocaduras do Complexo Estuarino de Paranaguá (CEP), objetivando analisar a distribuição espacial do Carbono Orgânico Particulado (COP) e do Carbono Orgânico Dissolvido (COD), as variações das saturações do CO2 e O2, análises metabólicas do estuário, fluxos de difusão do CO2 e as exportações do COP e do COD para a área costeira adjacente ao CEP. O sistema está localizado no estado do Paraná, região sul do Brasil, compreendendo uma área de 612km2 e um volume de 2x109m3. Amostras foram coletadas durante campanhas amostras, ao longo de gradientes de salinidade dos eixos Norte-Sul e Leste-Oeste, e nas desembocaduras Norte e Sul do sistema. As amostras de carbono orgânico foram analisadas através do método de combustão em alta temperatura HTC no equipamento TOC-5000 Shimadzu; os fluxos de difusão, na interface ar-água foram estimados de acordo com Carmouze (1994) e as exportações foram baseadas em fundeios de medição como equipamento S4 Current Meter, medindo as correntes e descargas de água durante um ciclo complete de maré. Os resultados apresentaram variações nos valores de concentração de carbono orgânico: máximo de 13.56mg.L-1, mínimo de 3.84mg.L-1, com uma média de 6.59mg.L-1 para o eixo Leste-Oeste; e 19.37mg.L-1, 5.44mg.L-1 e 8.59mg.L-1 para o eito Norte-Sul (valores máximo, mínimo e médio, respectivamente). Ao longo dos transectos de salinidade (em direção às desembocaduras do sistema estuarino), a concentração do carbono orgânico foi constante, enquanto a absorbância do CDOM diminuiu, inferindo na existência de diversas fontes de material orgânico para o sistema. As saturações do CO2 e O2 fora relacionadas com a salinidade e também se mostraram correlacionadas com a absorbância do CDOM nos comprimentos de onda de 320 e 443nm (61% e 47% para o O2; 63% e 46% para o CO2, respectivamente). Os eixos Leste-Oeste e Norte-Sul exibiram médias de fluxo de difusão de 1.74 e 2.72mM.m-2.h-1. As exportações de COD e COP na desembocadura Norte foi de 21.39kg.s-1 e 8.30kg.s-1, respectivamente; enquanto para a desembocadura Sul, as médias foram de -1.57kg.s-1 (em direção ao estuário) e 26.40kg.s-1, respectivamente. A presença de substâncias húmicas no sistema afeta a produção primária, e consequentemente afeta as saturações de CO2 e O2. O estuário demonstrou um metabolismo heterotrófico, exportando grandes quantidades de CO2 para a atmosfera e grandes quantidades de carbono orgânico, até mesmo quando comparado com alguns dos maiores rios do planeta.
Abstract: Variations of organic carbon sources and its spatial variations are important to comprehend the balances of the different organic carbon phases in the coastal zones. Surveys were made along the salinity gradients and mouths of the Paranaguá Estuarine Complex (PEC), objecting to analyze the spatial distribution of Particulate Organic Carbon (POC) and Dissolved Organic Carbon (DOC), variations of CO2 and O2 saturations, metabolic analysis of the estuary, the CO2 diffusive fluxes and the POC and DOC exportations to the adjacent coastal waters of the PEC. The system is located in the Paraná State, south of Brazil, comprising 612km2 and a water volume in the order of 2 x 109m3. Samples were collected, during four sampling campaigns, along the salinity gradients in the two axes, North-South and East-West axes, and in the Northern and Southern Mouths of the system. The organic carbon samples were analyzed by HTC TOC-500 Shimadzu equipment; diffusive fluxes at the air-water interface were estimated according to Carmouze (1994) and the exportations were based on the anchoring of the S4 Current Meter, measuring currents and water discharge for an entire tidal cycle. The main results showed a variation of the organic carbon concentration values: maximum of 13.56mg.L-1, minimum of 3.84mg.L-1 with a mean of 6.59mg.L-1 for the East-West Axis; and 19.37mg.L-1, 5.44mg.L-1 and 8.59mg.L-1 for the North-South Axis (maximum, minimum and mean values, respectively). Along the salinity transects (direction to the mouth of the estuarine system), the absorbance of CDOM diminishes, which infer different sources of organic matter to the system. The saturations of CO2 and O2 were related with the salinity and also showed correlations with the absorbance of CDOM at 320 and 443nm (61% and 47% for O2; 63% and 46% for CO2, respectively). The East-West and North-South axes exhibited mean diffusive fluxes of 1.74 and 2.72mM.m-2.h-1. The exportations of DOC and POC at the Northern Mouth had an average flux of 21.39kg.s-1 and 8.30kg.s-1, respectively; while the Southern mouth had an average flux of -1.57kg.s-1 (towards the estuary) and 26.40kg.s-1, respectively. The presence of humic substances in the system affects the primary production, consequently affecting the CO2 and O2 saturations. The estuarine system reflects a heterotrophic metabolism, exporting high amounts of CO2 to the atmosphere and high quantities of Organic Carbon to the adjacent ocean, even when compared to the major rivers in the world.
Yaginuma, Luciana Erika. "Os Nematoda da plataforma continental ao largo do sistema estuarino de Santos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/21/21131/tde-27072011-153347/.
Full textTo assess the influence of Santos estuarine system on the nematodes of the adjacent continental shelf, the density, composition and generic diversity of this group were analyzed and related to the sediment type, organic matter content and phytopigments biomass. The sediment was collected at six stations, in the winter of 2005 and summer of 2006, with a box-corer from which meiofauna samples were taken with a 4.9 cm2 superficial area and 10 cm height corer. Nematodes represented more than 95% of the total meiofauna, and their average densities were 2,472±1,794 ind.10cm-2 in the winter/2005 and 2,606±2,017 ind.10cm-2 in the summer/2006. The influence of Santos estuarine system was restricted to the closest areas to Santos bay and Bertioga channel and it was observed through the contribution of fine sediments and organic matter, which was more evident in the summer due to higher rainfall. In these areas, lower nematodes densities were found as higher abundance of deposit feeders genera, like Sabatieria and Terschellingia, and from the Xyalidae family. In the other shallow stations with well sorted sands and relatively high chlorophyll-a biomasses, densities were the highest and Chromadorita and Microlaimus, herbivorous/epistrate feeders, were predominant. In the deepest stations with finer sediments, the densities and diversities were the lowest and Sabatieria was dominant. Therefore, apart from the estuarine system, the depth and local hydrodynamics, which determines the sediment and trophic conditions, were important factors for the nematodes assemblages.
Agostinho, Katia Leite. "Estudo do nitrogênio e do fósforo (N e P) no setor norte do Complexo Estuarino-Lagunar de Cananéia-Iguape (SP) considerando as condições naturais do sistema e a influência dos aportes antrópicos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/21/21137/tde-04092015-094801/.
Full textThe Ribeira River rises in the state of Paraná- Brazil and outfalls in Iguape, state of São Paulo (Brazil). The river is 470 km long, and in its final portion, which is aproximately 70 km long, is called Ribeira de Iguape River. In this area an intense use of the soil can be found regarding the growth of bananas crops, there are also industrial mining activities, sewage disposal and some livestock. These activities contribute to the supply of nitrogenous and phosphate nutrients input for the hydrological body, which further reaches Cananéia-Iguape Estuary-Lagoon Complex through Valo Grande Channel, in Iguape. This study characterized the water system through hydrological and hydrochemical parameters such as water temperature, salinity, pH, dissolved oxygen, suspended matter and turbidity. It was conducted a diagnosis of the northern sector of the system in relation to the natural estuarine conditions present in the south sector. The observed values of nitrogen and phosphate were correlated with the estimated load of fertilizer used in banana plantations, which is the main crop in the study area. The banana plantation located in the river\'s margins, between the cities of Registro and Iguape, was estimated with the use of images, and resulted in approximately 744 hectares. Four campaigns of water sampling were made: winter of 2012 and 2013; summers 2013, 2014) with 19 stations along the River - Valo Grande channel - Cananéia Iguape Estuarine Lagoon System. Highest levels of nitrate were obtained in the river sample of 15.72 µmol L-1, and 14.59 µmol L-1 in the Channel, indicating the great contribution of this nutrient via river and significant contribution of the banana crop fertilization. Regarding the phosphate levels, they were extremely high throughout the sampling in the northern sector, especially in winter 2012, where the maximum level was 12.45 µmol L-1 in the River. This high contribution is ongoing and might receive additional contribution via tributaries, with strong indication of provenance from exploiting phosphate rocks, in the region of Cajati- SP, where effluent can reach the Ribeira de Iguape River through Jacupiranga River. The agricultural load of N and P were estimated in 44.22 t N year-1 (1.62% of total river load) and 5.36 t year-1 P (0.15% of total river load). The imbalance of P input in N:P shows this additional input of P- Phosphate in the north of the system, indicating the strong anthropogenic influence in the region in the two nutrients, but with higher load for P and a dilution towards south, which should be monitored.
Nelva, Pasqual Jean-Sébastien. "Exploration des réseaux d'interactions en écologie : de la structure vers la dynamique : signification des analyses des matrices de communauté en écologie des estuaires." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0114/document.
Full textNetworks are a key concept in ecology and a number of models and methods have been used. This PhD dissertation links two approaches, the community matrix and input-output analyses, which have been developed by separate streams of theory. It compares their assumptions with important features of estuarine systems. It explicitly analyses the links between the matrices and the significance of the mixed trophic impacts analysis. Matrices of storage and throughflow analyses are linked to Jacobian matrices of donor or recipient controlled compartment models. Unlike most of what can be seen in the litterature, here the mixed trophic impacts are interpreted as the effects of a compartment being present or absent. Using available data in the case of five European estuaries, qualitative and quantitative matrices are built in the aim of performing sensitivity analyses. First explorations reveal high levels of uncertainties, even in the sign of the predictions. Furthermore, this work examines in more details the possibilities to explore transient dynamics from the community matrix. This PhD dissertation emphasises important features which are necessary to consider when choosing such approaches
Rippeth, Thomas Philip. "The control of stratification in a fjordic system (the Clyde Sea)." Thesis, Bangor University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358121.
Full textPereira, Juliano Bicalho. "Composição, distribuição, biomassa e produção secundária do zooplâncton do Sistema estuarino de Santos, São Paulo, Brasil." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/21/21131/tde-09082011-135919/.
Full textThe zooplankton´s composition, distribution, abundance, biomass and secondary production of Santos estuarine system were studied on Santos bay (4 stations), Santos channel (3 stations) and Bertioga channel (4 stations) between November 2004 and October 2005 in relation to temperature, salinity, suspended matter, dissolved nutrients and chlorophyll-a. On the 114 analyzed samples, zooplankton was constituted of 101 taxa distributed among 10 phyla: Arthropoda (subphylum Crustacea), Annelida (class Polychaeta), Bryozoa, Chaetognatha, Chordata (subphylum Tunicata), Cnidaria, Ctenophora, Echinodermata, Mollusca and Phoronida, being Arthropoda the dominant phylum. Copepoda (subphylum Crustacea) constituted on average 85,5% of total zooplankton. The zooplankton community among the three areas included estuarine, coastal and oceanic taxa, being Oithona hebes, Oithona oswaldocruzi, Acartia lilljeborgi, Acartia tonsa, Bestiolina similis, Balanus spp. (naupli), Paracalanus quasimodo, Paracalanus spp. (copepodite), Parvocalanus scotti, Euterpina acutifrons, Pseudodiaptomus acutus, Oikopleura dioica and the larvae of Polydora spp., Aonides spp., Spionidae and Bivalvia dominant. The abundance, biomass and zooplanktonic secondary production were higher on Bertioga channel, whereas the productivity was higher on Santos bay. These factors were associated mainly to salinity, water temperature and total suspended matter.
Becker, May Ling Luettich Richard A. "Hydrodynamic behavior of the Cape Fear River estuarine system, North Carolina." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,2965.
Full textTitle from electronic title page (viewed Jun. 23, 2010). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Marine Sciences Physical Oceanography." Discipline: Marine Sciences; Department/School: Marine Sciences.
Smar, Daina. "An assessment of ecological processes in the Apalachicola estuarine system, Florida." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5506.
Full textM.S.
Masters
Civil, Environmental, and Construction Engineering
Engineering and Computer Science
Civil Engineering; Water Resources Engineering
Siqueira, Bibiana Kumpera. "Contribuição ao processo sedimentar atual no Canal do Ararapira, sistema estuarino-lagunar de Cananéia-Iguape (SP)." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/21/21133/tde-01072008-102612/.
Full textThe aim of this study is the analysis of modern sedimentary process taking place in the Ararapira Channel, at Cananéia-Iguape lagoonal estuarine system (SP). The employed parameters for this were the composition and grain size characteristics of the bottom sediments , the distribution of the carbonates , organic matter, and relates these parameters to the general configuration of the channel and to the oceanographic process that takes place over there. The grain size analysis, the carbonate content, and the sediment organic matter (C, N, S) were conducted over 60 sediment samples collected during an oceanographic cruise that took place in July 2004. Among the total of the 60 samples, 16 were selected for the coarse fraction analysis. The spatial analysis of the distribution of sediments and sedimentary organic matter showed that sandy sediments, with low organic content, are predominant practically all along the whole of the channel extension, except in points located in the central-northern portion of the channel, where there are thin sediment associated to shoals or small continental and insular river courses. The C, N, S and carbonates contents observed with the coarse fraction analysis, allow identifying the predominance of continental influence all along the channel, with lower carbonate concentrations. The sediment organic matter contents have, usually, behavior and distribution which are directly related to the type of sediment ,to the bottom topography, as well as to the circulation. It was possible to observe a direct relationship between the thin sediment and a larger content of the organic matter.
Hunt, Laura R. "The estuarine Killifish, Fundulus heteroclitus, as a model system for developmental immunotoxicology." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1181668640/.
Full textBraungardt, Charlotte Barbara. "Metal biogeochemistry of a mine contaminated estuarine-coastal system in SW Spain." Thesis, University of Plymouth, 2000. http://hdl.handle.net/10026.1/1075.
Full textBernardes, Marcos Eduardo Cordeiro. "Medium-term (months to years) morphodynamic modelling of a complex estuarine system." Thesis, University of Plymouth, 2005. http://hdl.handle.net/10026.1/1813.
Full textAlgan, A. Oya. "Sedimentology and geochemistry of fine-grained sediments in the Solent Estuarine System." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241246.
Full textCundy, Andrew Brian. "Radionuclide and geochemical studies of recent sediments from the Solent estuarine system." Thesis, University of Southampton, 1994. https://eprints.soton.ac.uk/50591/.
Full textStirling, James R. "Dynamical system models of patchiness in estuaries." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/13623.
Full textLevasseur, Anne. "Observations and modelling of the variability of the Solent-Southampton Water estuarine system." Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/63761/.
Full textAli, Ayub. "Physical Processes of a Shallow Subtropical Estuarine System : Coombabah Lake, Gold Coast, Australia." Thesis, Griffith University, 2010. http://hdl.handle.net/10072/366810.
Full textThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Engineering
Science, Environment, Engineering and Technology
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Johnson, Ashley Murphy. "Estuary use planning and the application of terrestrial zoning principles in an estuarine system a case study of the Guana Tolomato Matanzas National Estuarine Research Reserve /." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0005742.
Full textLonsdale, Jemma-Anne. "Developing an estuarine planning support system : a case study for the Humber Estuary, UK." Thesis, University of Hull, 2018. http://hydra.hull.ac.uk/resources/hull:16549.
Full textCarroll, Brett. "Microbial and geochemical aspects of selenium cycling in an estuarine system Lake Macquarie, NSW /." Connect to full text, 1999. http://hdl.handle.net/2123/378.
Full textTitle from title screen (viewed Apr. 21, 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Dept. of Chemical Engineering, Graduate School of Engineering. Includes bibliography. Also available in print form.
Peierls, Benjamin Lewis Paerl Hans W. "Microbial productivity in the Neuse River and Pamlico Sound estuarine system patterns and perturbations /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2009. http://dc.lib.unc.edu/u?/etd,2583.
Full textTitle from electronic title page (viewed Oct. 5, 2009). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Marine Sciences." Discipline: Marine Sciences; Department/School: Marine Sciences.
Carroll, Brett Ian. "Microbial and Geochemical aspects of Selenium cycling in an Estuarine system: Lake Macquarie N.S.W." Thesis, The University of Sydney, 1999. http://hdl.handle.net/2123/378.
Full textCarroll, Brett Ian. "Microbial and Geochemical aspects of Selenium cycling in an Estuarine system: Lake Macquarie N.S.W." University of Sydney, Chemical Engineering, 1999. http://hdl.handle.net/2123/378.
Full textRawling, M. Carl. "Particle-water interactions of hydrophobic organic micropollutants in marine systems." Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/1926.
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Full textCRAVEIRO, Nykon. "Hidrocarbonetos no sedimento superficial do sistema estuarino do Rio Formoso, nordeste do Brasil." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18335.
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CNPq
A contaminação por hidrocarbonetos (HCs) do petróleo em regiões costeiras marinhas, como os estuários, é considerada uma das mais importantes e impactantes, devido aos danos que esses elementos podem ocasionar aos organismos e ao homem. O objetivo do presente estudo foi investigas, pela primeira vez, os hidrocarbonetos nos sedimentos superficiais do sistema estuarino do Rio Formoso (SERF), litoral Sul do estado de Pernambuco – Brasil. Os compostos de hidrocarbonetos alifáticos (HAs) foram determinados em cromatógrafo a gás (GC) Agilent Tecnologies 7820A, acoplado a um detector de ionização de chamas (DIC) e os compostos de hidrocarbonetos policíclicos aromáticos (HPAs) foram determinados no mesmo cromatógrafo, porém acoplado a um espectrômetro de massas 5975 (MS) em modo de monitoramento de íons selecionados (SIM). A concentração de alifáticos totais (∑Alif) nos sedimentos do SERF variou entre 1,37 e 126,64 μg g-1 peso seco (ps), com as concentrações de n-alcanos totais (Σn-Alc) entre 0,51 e 27,5 μg g-1 ps, oriundos principalmente de fontes biogênicas, como vegetais superiores. A concentração de HPAs (Σ16HPAs) variou entre 3,80 e 500,3 ng g-1 ps, provenientes de fontes petrogências e pirogênicas As concentrações de hidrocarbonetos alifáticos e aromáticos detectados nos sedimentos do sistema estuarino do Rio Formoso foram consideradas baixas, quando comparadas com outras áreas estudadas ao redor do mundo e aos índices propostos por estudos e agências reguladoras nacionais e internacionais, sugerindo um ambiente com pouco impacto sobre a biota. Contudo, a presença de compostos como HPAs é um indicativo de ação antrópica sobre o sistema, sendo importante a implantação e manutenção de um programa de monitoramento na área, quanto aos hidrocarbonetos, para avaliar os possíveis impactos que a presença desses compostos possam ocasionar sobre o SERF e garantir a conservação continuada de um estuário de tamanha importância ecológica, econômica e social.
The contamination by hydrocarbons (HCs) of oil in marine coastal regions, such as estuaries, is considered one of the most important and impactful due to the damage that these elements may cause to the bodies and man. The aim of this study was investigas for the first time, the hydrocarbons in the surface sediments of the estuarine system of the Formoso river (SERF), South coast of the state of Pernambuco - Brazil. Aliphatic hydrocarbon compounds (HAs) were determined on a gas chromatograph (GC) Agilent Technologies 7820A coupled to a flame ionization detector (FID) and polycyclic aromatic hydrocarbon compounds (PAH) were determined in the same chromatograph, however coupled a mass spectrometer 5975 (MS) in selected ion monitoring mode (SIM). The concentration of total aliphatic (ΣAlif) in SERF sediments ranged between 1.37 and 126.64 μg g-1 dry weight (dw), with total n-alkanes concentrations (Σn-Alc) between 0.51 and 27.5 μg g-1 dw, mainly from biogenic sources such as higher plants. The concentration of PAHs (Σ16HPAs) ranged from 3.80 to 500.3 ng g-1 dw, from petrogências sources and pyrogenic Hydrocarbon concentrations aliphatic and aromatic detected in the sediments of the estuarine system of the Formoso river were considered low compared with other areas studied around the world and the indices proposed by studies and national and international regulatory agencies, suggesting an environment with little impact on the biota. However, the presence of compounds such as PAHs is indicative of human action on the system, it is important to establishing and maintaining a monitoring program in the area, as hydrocarbons, to assess the possible impact that the presence of these compounds can cause on SERF and ensure the continued conservation of an estuary of such ecological, economic and social.