The benefits of low UV dose treatment of horticultural produce – also known as hormetic treatment - have been attested to in numerous studies conducted over the last 15 years. However, commercial growers have not adopted the concept of hormesis. With increasingly stringent controls on the use of fungicides and other chemical agents the time has come to examine how hormetic treatment might be applied in the horticulture sector. The objectives of this work were firstly, to confirm UV-induced hormetic effects applied postharvest for a number of different types of produce, namely, tomatoes, broccoli, strawberries and mangoes. Secondly, to evaluate the use of rollers to ensure full surface treatment of produce, and thirdly to evaluate the possibility of treating produce preharvest. In order to investigate surface UV dose distributions, a polystyrene sphere (Diameter 70 mm) was used to simulate fruits such as tomatoes, apples, peaches etc., that have an approximately spherical form. Biodosimetry based on spores of Bacillus subtilis was employed to experimentally determine UV doses and to compare the results obtained with theoretical predictions. Good agreement was obtained and the modelling approach was extended to other types of produce. This showed the amenability of mechanical rollers to ensure full surface treatment of produce. Postharvest treatment of produce was carried using conventional low intensity UV sources principally emitting at 254 nm and also a commercially available high energy pulsed UV source. Treatment using the conventional UV source was carried out on mechanical rollers within a UV cabinet designed for this work at a fixed distance from the source and at an intensity of 1000 μW/cm2. A 5 minute conventional UV treatment of tomatoes was approximately comparable to fruit given a 3-pulsed treatment using the pulsed source (507 J/pulse of polychromatic light). The colour and texture of both groups of fruit were significantly maintained as compared with controls. The treated tomatoes also showed a significant increase in the ascorbic acid levels during storage. Similarly, a 15 minute conventional UV treatment of broccoli heads was comparable to heads given a 10-pulsed treatment using the pulsed source. Where both treatments gave rise to a statistically significant retention of green colour of treated broccoli. In addition, mangoes given a 10 minute conventional UV treatment were comparable to fruit given a 20-pulsed treatment using the pulsed source with both treatments leading to maintenance of texture as compared to control fruit. This confirmed the UV-hormetic effects. The effects of conventional and pulsed treatments are compared and discussed. Preharvest treatment of tomatoes and strawberries was carried out in commercial glasshouses. Doses of either 3 or 8 kJ/m2 were delivered to the fruits using a treatment device designed for the work, which delivered a combined intensity of 2000 μW/cm2 from two low pressure UV sources. The treated tomatoes showed a delay in development of colour as measured on the vine and after picking. Picked tomatoes were inoculated with P. digitatum and C. gloeosporioides and the results obtained showed a significant inhibition of the development of the fungi in the treated fruit during the storage period. These results suggest that the beneficial response shown by the preharvest treatment is not a localised one but a systematically induced resistance observable throughout the treated plant. This was shown by monitoring tomato fruits on treated plants which themselves where not directly exposed to the UV light. The two doses elicited different responses in the treated strawberries, with the 8 kJ/m2 dose causing the fruit to redden significantly faster than the 3 kJ/m2 treated fruits and controls. This could have significant nutritional benefit as the red colour of strawberries has been correlated with anthocyanin levels. On the other hand, treatment at the lower UV dose led to a lag in colour development. The amenability of the equipment utilised for commercial application is discussed.

Master of Science / Department of Food Science / Elizabeth A. E. Boyle / To validate how packaging and storage reduces Listeria monocytogenes (Lm) on whole muscle turkey jerky and smoked sausage sticks, four packaging systems, including heat seal (HS), heat seal with oxygen scavenger (HSOS), nitrogen flushed with oxygen scavenger (NFOS), and vacuum (VAC), and four ambient temperature storage times were evaluated. Commercially available whole turkey jerky and pork and beef smoked sausage sticks were inoculated with Lm using a dipping or hand-massaging method, respectively. There was no interaction on packaging and storage time on Lm reduction on smoked sausage sticks and an Lm log reduction of >2.0 log CFU/cm[superscript]2 was achieved in smoked sausage sticks packaged in HS, HSOS, and VAC. A >2.0 log CFU/cm[superscript]2 reduction was achieved after 24 h of ambient temperature storage, regardless of package type. NFOS was less effective in reducing Lm by more than 0.5 log CFU/cm[superscript]2 compared to HS, HSOS or VAC. After 30 d of ambient storage, Lm had been reduced by 3.3 log CFU/cm[superscript]2 for all packaging environments. In turkey jerky, Lm reduction was affected by the interaction of packaging and storage time. HS, HSOS, NFOS, or VAC in combination with 24, 48, or 72 h ambient temperature storage achieved <1.0 log CFU/cm[superscript]2. After 30 d at ambient temperature storage, Lm was reduced by >2.0 log CFU/cm[superscript]2 in HS and VAC, and could serve as a post-lethality treatment. Alternatively, processors could package turkey jerky in HSOS or NFOS in combination with 30 d ambient storage period as an antimicrobial process. Very little data has been published describing how packaging atmospheres affects Lm survival in RTE meat. The mechanism for Lm reduction under these conditions is not fully understood and additional research is needed.

Master of Science / Department of Animal Sciences and Industry / Elizabeth A. E. Boyle / Light emitting diode (LED) and fluorescent (FLS) lighting effects on enhanced pork loin chops, beef longissimus dorsi and semimembranosus steaks, ground beef, and ground turkey displayed in two retail display cases set up with similar operational temperatures were evaluated using visual and instrumental color, Enterobacteriaceae (EB) and aerobic plate counts (APC), internal product and case temperatures, and thiobarbituric acid reactive substances (TBARS). Visual discoloration of the five meat products increased (P<0.05) as display time increased. Beef longissimus dorsi steaks, ground beef, and the superficial portion of beef semimembranosus steaks had less (P<0.05) visual discoloration under LED lighting than FLS. Compared to FLS, pork loin chops under LED lighting had higher (P<0.05) L* values and a lower (P<0.05) a/b ratio. The deep portion semimembranosus steak under LED was redder (P<0.05) and the superficial portion had a lower (P<0.05) a/b ratio; LED deep and superficial portion semimembranosus steaks had higher (P<0.05) saturation index values at 5.18 and 4.47, respectively, on d 0 than FLS. Pork chops under LED lighting had lower (P<0.05) APC populations than FLS by the end of display. Enterobacteriaceae populations fluctuated throughout display on ground turkey under FLS lighting while populations remained stable under LED. APC populations increased as display time increased for pork loin chops, ground beef and ground turkey, but not beef longissimus dorsi steaks possibly due to initial case-ready postmortem age. As display time increased, EB populations increased (P<0.05) for pork loin chops, ground beef and ground turkey. The internal temperature of all products, except beef longissimus dorsi steaks, was lower (P<0.05) in the LED case. FLS case temperatures were higher (P<0.05) by 0.56 to 1.11°C than LED over the duration of the study. Pork loin chops, ground turkey, and beef semimembranosus steaks had higher (P<0.05) TBARS values by 0.06 to 0.24 mg malonaldehyde/kg under LED lighting, but lighting type did not affect (P>0.05) lipid oxidation of beef longissimus dorsi steaks or ground beef. LED lighting results in lower display case temperatures, lower internal product temperatures, and extended color life; however, lipid oxidation was increased in some cuts under LED lighting.

Garden Banks field 236, known as Pimento, is part of a lower middle Pleistocene submarine-fan deposit in the north central Gulf of Mexico. Pimento field represents a classic example of a prograding fan across the continental shelf continuing across the continental slope filling and spilling minibasins. Channel complexes cut through the field as sediment migrated across the shelf and slope to the basin floor. This thesis consists of two papers which utilized donated 3D seismic data on six of the blocks in Pimento field. Public domain data was incorporated with these data to explore the producing reservoir sand in the field. Mapped horizons revealed the overall structural elements of the field including the fill and spill facies of the minibasin that directly influences the deposition of the field. In these papers, channel complexes have been resolved using seismic geomorphological techniques and cross sections. Two potential drilling targets have also been discovered and one has been initially investigated as a drilling target.

Uma abordagem multiproxy [n-alcanos, alquenonas, n-alcanóis, esteróis, carbono orgânico total (COT) e &#948;13C] foi utilizada em amostras de testemunho sedimentar de alta resolução para avaliar variações paleoclimáticas e paleoceanográficas na região da Plataforma Continental de Sudeste do Brasil ao longo do Holoceno Tardio. O modelo de idade, obtido através da análise de 14C, demonstrou que o testemunho representa os últimos 2900 anos. A partir dos marcadores, principalmente os moleculares orgânicos, foi possível observar quatro diferentes fases ao longo do testemunho, com eventos característicos de cada fase. A primeira fase, entre a base do testemunho e 1800 anos antes do presente (AP), apresentou as concentrações mais altas de marcadores moleculares terrígenos, valores mais altos de COT e da taxa de sedimentação, além de apresentar um aumento nos valores da temperatura da superfície do mar (TSM). Com isso, essa fase foi relacionada a um regime pluviométrico mais intenso no continente adjacente provavelmente relacionado ao dipolo de temperatura entre os oceanos Atlântico nordeste e sudoeste e mudanças na intensidade da Zona de Convergência do Atlântico Sul (ZCAS), influenciado principalmente pela frequência de eventos El Niño Oscilação Sul (ENOS) e deslocamento da Zona de Convergência Intertropical (ZCIT) para regiões mais ao sul. A segunda fase, entre 1800 e 1600 AP, foi associado a um período de regime hidrodinâmico mais intenso, com um meandramento mais vigoroso da Corrente do Brasil (CB), dificultando a deposição de sedimentos finos na região e causando os percentuais mais altos da fração areia nesse período. A terceira fase, entre 1600 e 600 anos AP, foi caracterizada por uma mudança do aporte regional de material terrígeno proveniente de regiões mais ao sul da área de coleta do testemunho, provavelmente Rio da Prata, e transportado pela Corrente Costeira do Brasil (CCB), indicado pela presença dos marcadores moleculares e pela diminuição da TSM. A quarta fase, entre 600 anos AP e o topo do testemunho, apresentou um aumento gradual de marcadores marinhos e diminuição mais acentuada da TSM. Esse comportamento está relacionado a intensificação dos eventos de ressurgência na região entre a Ilha de São Sebastião e Cabo Frio, causada por regimes de vento NE e pela formação de meandros da CB. Os períodos correspondentes aos eventos Medieval Climate Change e Little Ice Age não apresentaram variações dos marcadores ou da TSM no testemunho analisado. / A multiproxy approach [n-alkanes, alkenones, n-alkanols, sterols, total organic carbon (TOC) and &#948;13C] was used in samples of a high resolution sediment core to evaluate paleoclimatic and paleoceanographic variations in the continental shelf region of Southeastern Brazil along the Late Holocene. The age model, obtained through the 14C analysis, demonstrated that the core represents the last 2900 years. Using the markers, especially the organic molecular ones, it was possible to observe four different phases along the core, with characteristic events of each phase. The first phase, between the base of the core and 1800 years before present (BP), presented the highest concentrations of terrigenous molecular markers, the highest values of TOC and sedimentation rate, in addition to an increase in the sea surface temperature (SST) values. This phase was related to a more intense pluviometric regime in the adjacent continent, probably related to the temperature dipole between the northeast and southwest Atlantic oceans and changes in the South Atlantic Convergence Zone (SACZ) intensity, mainly influenced by the frequency of El Niño-Southern Oscillation (ENSO) events and displacement of the Intertropical Convergence Zone (ITCZ) to more southern regions. The second phase, between 1800 and 1600 BP, was associated to a more intense hydrodynamic period, with a more vigorous meander of the Brazilian Current (BC), making the deposition of fine sediments difficult in the region and causing the highest percentages of the sand fraction in this period. The third phase, between 1600 and 600 years BP, was characterized by a change in the regional supply of terrigenous material, where it would come from regions further south from the sampling core area, probably Rio de la Plata, and transported by Brazilian Coastal Current (BCC), indicated by the presence of molecular markers and decreased of SST. The fourth phase, between 600 years AP and the top of the core, showed a gradual increase of marine markers and a more pronounced decrease of SST. These results are related to the intensification of resurgence events in the region between São Sebastião Island and Cabo Frio, caused by NE wind regimes and CB meander formation. The periods corresponding to the events Medieval Climate Change and Little Ice Age did not present variations of the markers or the SST in the analyzed core.

Orientador: Otto Bismarck Fazzano Gadig / Coorientador: Debra Jean Murie / Resumo: As raias-viola (Elasmobranchii: Rhinobatiformes) são geralmente components da captura acessória da pesca multiespecífica de arrasto na região sudeste e sul do Brasil. Considerando a falta de estudos específicos sobre a estrutura etária e populacional dessas espécies há, portanto uma necessidade de pesquisas que possibilitem uma avaliação adequada da condição desses estoques. O presente avaliou a estrutura e a capacidade de crescimento populacional, dessas espécies na plataforma continental do Estado de São Paulo, utilizando para isso o estudo de idade e crescimento e a análise demográfica. Estavam disponíveis para o estudo 149 exemplares de Rhinobatos horkelli, 752 exemplares de Rhinobatos percellens e 952 exemplares de Zapteryx brevirostris. Desse total foi utilizada uma sub-amostra para realização do estudo de idade e crescimento. O melhor modelo que descreveu o crescimento das espécies foi a função do cresciemento de três parâmetros von Bertalanffy, sendo que os parâmetros estimados foram: L∞=121.71, k=0.21 e t0=-1.34 para Rhinobatos horkelli (sexo agrupado); L∞=106.99, k=0.17 e t0=-1.51 para Rhinobatos percellens (fêmea); L∞=90.69, k=0.24 e t0=-1.36 para Rhinobatos percellens (macho); L∞=60.73, k = 0.23 e t0 = -1.44 para Zapteryx brevirostris (fêmea) e L∞ = 57.88, k=0.26 e t0=-1.29 para Zapteryx brevirostris (macho). Através da análise de borda e do incremento marginal, sugere-se a formação de um par de banda (opaca e translúcida) por ano. A formação da banda translúcida deve ocorrrer entre o final do inverno até próximo do final da primavera. Cinco cenários foram avaliados para verificar a taxa intrínseca de crescimento populacional. De acordo com os resultados obtidos sob condições naturais e com a ausência da pesca a populacão de Rhinobatos horkelli pode aumentar cerca de 9% por ano, Rhinobatos percellens cerca de 10% ao ano e Zapteryx brevirostris 3.9% ao ano. Em um outro cenário com ... / Abstract: Guitarfishes (Elamobranchii, Rhinobatiformes) are usually components of the multispecific fishery as by-catch of double-rig, pair and single bottom trawls in the southeast and south of Brazil (Martins & Schwingel, 2003). Considering the lack of life history parameters on the age and population structure studies of these species there is therefore a need for research to enable a proper assessment of the condition of these stocks. We evaluated the structure and the capacity of population growth in the State of São Paulo continental shelf, using the estimated growth and demographic parameters. Were available for this study, 149 samples of Rhinobatos horkelli, 752 samples of Rhinobatos percellens and 952 samples of Zapteryx brevirostris.A sub-sample were used for the age and growth study. The best model that describes the growth of the species was the three parameters von Bertalanffy growth function. Estimated parameters were : L∞=121.71 , k =0.21, and t0 = -1.34 for Rhinobatos horkelli (grouped sex), L∞ = 106.99 , k = 0.17 and t0 = -1.51 for Rhinobatos percellens (female) , L∞ = 90.69 , k = 0:24 and t0 = -1.36 for Rhinobatos percellens (male), L∞ = 60.73 , k = 0.23 and t0 = - 1.44 to Zapteryx brevirostris (female) and L∞ = 57.88 , k = 0.26 and t0 = -1.29 for Zapteryx brevirostris (male). Centrum edge analysis and marginal increment suggests the formation of one band-pair (opaque and translucent) per year. The formation of the translucent band should occour from late winter to the end of the spring. Five scenarios were evaluated for estimated the intrinsic rate of population growth. According to the results obtained under natural mortality conditions and in the absence of fishing, population trends of Rhinobatos horkelli showed a increase about 9% per year, Rhinobatos percellens about 10% per year and Zapteryx brevirostris 3.9% per year. When were considered scenarios with the presence of fishing, all species ... / Doutor

Proxies geoquímicos (n-alcanos, alquenonas, GDGTs, &#948;13C, Fe/Ca e Ti/Ca), obtidos em amostras de um testemunho sedimentar, foram utilizados para avaliar as mudanças paleoclimáticas e paleoceanográficas na região da Plataforma Continental de São Sebastião ao longo do Holoceno Tardio. O modelo de idade, obtido através da análise conjunta dos métodos de 210Pb e 14C, demonstrou que testemunho aqui estudado cobre os últimos 1500 anos. A avaliação dos marcadores terrígenos permitiu a identificação das mudanças na drenagem e erosão continental, as quais estão relacionadas às alterações no regime de precipitação do continente adjacente. Variações ao longo do tempo na temperatura da superfície do mar foram relacionadas às mudanças no regime de ventos predominante, os quais são responsáveis por um aumento ou uma redução da frequência dos eventos de ressurgência. Já as mudanças nos valores de temperatura de subsuperfície foram relacionadas com a entrada e saída da Água Central do Atlântico Sul próxima às regiões costeiras, e com os processos de mistura na coluna d\'água. As variações na temperatura média do ar (TMA), por sua vez, provavelmente estiveram relacionadas com mudanças na irradiação total solar. Períodos representados pelos valores mais elevados de TMA correspondem aos períodos de máxima irradiação solar conhecidos como Máxima Medieval (1100 a 1250 DC) e Máxima Moderna (1950 - presente) e o período representado pelos menores valores de TMA coincide com o período de mínima solar conhecido como Spörer. Além disso, foi possível observar uma redução na entrada de material terrígeno para a plataforma continental durante a Anomalia Climática Medieval. Em contrapartida, o período que corresponde a Pequena Era do Gelo foi caracterizado por um aumento da contribuição terrígena. No geral, foi possível observar que o gradiente de temperatura da superfície do mar entre o Oceano Atlântico Norte e o Atlântico Sul parece desempenhar um papel importante desencadeando ou amplificando as mudanças climáticas observados nos trópicos. Este dipolo de temperatura pode ocasionar mudanças na posição da Zona de Convergência Intertropical e no regime de ventos predominantes, que por sua vez irão influenciar, direta e indiretamente, nas mudanças na circulação marinha de superfície e no regime de chuvas da região. / Geochemical proxies (n-alkanes, alkenones, GDGTs, &#948;13C, Fe / Ca and Ti / Ca) were used to evaluate the paleoclimatic and paleoceanographic changes in the Continental Shelf of São Sebastião during the Late Holocene. The age model, obtained through the combined analyses of 210Pb and 14C methods, indicated that the core used in this study covers the last 1500 years. Variations in the sea surface temperature may be related to changes in the prevailing winds, which in turn are responsible for an increase or reduction in the frequency of the upwelling events. Changes in subsurface temperature values can be related to the presence of the South Atlantic Central Water near the coastal regions, and the mixing processes in the water column. Changes in mean air temperature (MAT), in turn, are probably related to fluctuations in total solar radiation, since periods represented by higher values of MAT correspond to the periods of maximum solar irradiation known as Medieval (1100-1250 AD) and Modern Maximum (1950 - present). While the period represented by the lower MAT values can be linked to the solar minimum period known as Spörer. The evaluation of terrigenous markers allowed the identification of variations in the drainage and continental erosion, which in turn are related to changes in the precipitation of the adjacent continent. Furthermore, the Medieval Climate Anomaly was characterized by a decrease in the terrigenous input, while the Little Ice Age could be characterized as a period of increased terrestrial contribution. Overall, it was observed that the sea surface temperature gradient between the North Atlantic and the South Atlantic Oceans appears to play an important role in triggering or amplifying climate change observed in the tropics. This temperature dipole can cause changes in the position of the Intertropical Convergence Zone and the direction of prevailing winds, which in turn will influence, directly and indirectly, the marine circulation and the rainfall.

A preocupação constante com a inocuidade e a qualidade dos alimentos irradiados, aliada à tendência de se estudar os aspectos sensoriais desses alimentos, foram a motivação para o desenvolvimento deste trabalho que teve como objetivos verificar os efeitos da radiação ionizante produzida pelo 60Co na sobrevivência de Salmonella sp em hambúrgueres de carne de frango congelados e verificar a aceitação do produto irradiado durante o seu período de estocagem. Amostras de hambúrguer de carne de frango congelados, inoculados com quatro cepas diferentes de Salmonella sp foram expostos a níveis de radiação com doses variando entre O e 3,5 kGy para verificação da sobrevivência da população de Salmonella sp presente. Amostras não inoculadas e irradiadas com doses de 0,5 e 7 kGy foram submetidas à avaliação sensorial por painel não treinado, pelo período de 120 dias, com o intuito de se verificar o decaimento da qualidade do produto. Os valores D10 encontrados para Salmonella sp variaram entre 1,02 e 1,32 kGy, portanto, as doses de 5 e 7 kGy, utilizadas nas fases seguintes do experimento, seriam suficientes para reduzir a população de Salmonella sp no produto em 5-6 ciclos logarítmicos. A exposição às doses de 5 e 7 kGy não afetou as características sensoriais do produto. A vida de prateleira do hambúrguer de carne de frango congelado e irradiado com doses de 5 e 7 kGy foi de, no mínimo, 120 dias, ou seja, igual à do produto não irradiado. / Safety and quality of irradiated foods are still of great concern to researchers and consumers, in general. The aims of this research were to study the effects of ionizing radiation from 60Co on the population of Salmonella sp inoculated in frozen chicken meat patties as well as on their sensory characterisitcs during the storage period. Samples of frozen chicken meat patties, inoculated with a pool of four strains of Salmonella sp, were exposed to irradiation doses varying from 0 to 3.5 kGy in order to determine their sensitivity (D10). Non inoculated samples of frozen chicken meat patties exposed to 5 and 7 kGy and a non inoculated and non irradiated sample were submitted to sensory evaluation by a non-trained panel. 010 values varied from 1.02 to 1.32 kGy Samples exposed to 5 and 7 kGy did not showed appreciable changes during the storage period of 120 days. Therefore, irradiation can be applied to chicken meat patties in order to improve their safety during a storage period of, at least, 120 days.

A fim de avaliar a influência do sistema estuarino de Santos sobre os Nematoda da plataforma continental adjacente, a densidade, composição genérica e diversidade desse grupo foram analisadas e relacionadas com o tipo de sedimento, teor de matéria orgânica e biomassa de fitopigmentos. Para isso, o sedimento foi coletado em seis estações, no inverno/2005 e verão/2006, com um amostrador do tipo box-corer, do qual foram retiradas amostras para a meiofauna com um tubo de 4,9 cm2 de área superficial e 10 cm de altura. Os Nematoda representaram mais de 95% da meiofauna, com densidades médias de 2472±1794 ind.10cm-2 no inverno/2005 e de 2606±2017 ind.10cm-2 no verão/2006. A influência do sistema estuarino de Santos restringiu-se às áreas na saída da baía de Santos e do canal de Bertioga e deu-se através do aporte de sedimentos finos e de matéria orgânica, que foi mais evidente no verão devido à maior pluviosidade. Nessas áreas foram observadas menores densidades e maior abundância de gêneros depositívoros, como Sabatieria e Terschellingia e da família Xyalidae. Nas outras estações rasas com sedimento arenoso, bem selecionado e com biomassa de clorofila-a relativamente alta, as densidades foram as mais altas e predominaram Chromadorita e Microlaimus, herbívoros/comedores de epistrato. Nas estações mais profundas, com sedimento mais finos, a densidade e diversidade foram menores e Sabatieria foi dominante. Portanto, além do sistema estuarino, a profundidade e o hidrodinamismo local, que determinam as condições sedimentares e tróficas, foram fatores importantes para as associações dos Nematoda. / To 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.

O presente trabalho visa avaliar a mobilidade de sedimentos na plataforma continental do Estado de São Paulo levando em conta a propagação de ondas e o tipo de sedimento. Com base no clima de ondas da região, resultante do modelo global de ondas WAVEWATCH-III, o modelo MIKE-21 (SW) foi aplicado para avaliar os processos de transformação de ondas a medida em que elas avançam sobre a plataforma continental. As ondas predominantes são as de sul com 36% e leste com 34%, variando de 1 a 2,5 metros de altura e 6 a 10 segundos de período. Esses dados formam a condição de contorno externa do modelo que fornece as informações necessárias para as estimativas de mobilidade sedimentar. Este processo foi avaliado através da aplicação de uma aproximação empírica onde a máxima velocidade orbital de fundo deve ser maior que a velocidade crítica de fundo. A altura significativa e período médio chegam a remobilizar areia fina até 40 m, areia muito fina até 45 m e silte até 60 m de profundidade. Altura máxima e período de pico, remobilizam areia fina até 60 m, areia muito fina até 80 m e silte até 90m de profundidade. / This study aims to evaluate the mobility of sediments on continental shelf of São Paulo State considering wave propagation and sediment type. Based on wave climate of the region resulting from global wave model WAVEWATCH-III, numerical model MIKE-21 (SW) was applied to evaluate wave transformation processes as they propagate over the continental shelf. Waves from south and east are predominant with 36% and 34%, respectively, wave height ranged from 1 to 2.5 meters and wave period varied between 6 and 10 seconds. These data form boundary condition of the model and provides necessary information to estimate sediment mobility. In order to evaluate this process, an empirical approach was applied, where maximum bed orbital velocity must exceed a critical bottom velocity. The significant wave height and mean period mobilize fine sand up to 40 m, very fine sand up to 45 m and silt up to 60 meters deep. Maximum height and peak period, mobilize fine sand up to 60 m, very fine sand up to 80 m and silt up to 90 meters deep.