O presente trabalho tem como enfoque o estudo de foraminíferos planctônicos, na margem continental Sudeste Brasileira, entre São Sebastião, SP e Cabo de São Tomé, RJ através do levantamento das espécies existentes no plâncton. Buscou conhecer a distribuição sazonal e vertical na coluna d?água (0 a 100 m de profundidade) das espécies de foraminíferos planctônicos, correlacionar a presença desses organismos a fatores abióticos e bióticos no meio ambiente. Comparar a composição da biocenose e da tanatocenose assim como, realizar análise tafonômica das carapaças depositadas no fundo oceânico, a fim de avaliar o registro sedimentar desses organismos e considerar a utilização de assinaturas tafonômicas em carapaças de foraminíferos planctônicos na compreensão dos processos hidrodinâmicos na área de estudo. Para isso, foram analisadas amostras de plâncton, coletadas no verão/2002 e inverno/2002, e amostras de sedimento. Foram aplicadas metodologias usuais em análises de foraminíferos planctônicos. Foi possível reconhecer que há grande diferença sazonal na abundância e no tamanho de foraminíferos planctônicos na margem continental Sudeste Brasileira. A distribuição vertical desses organismos no verão parece estar relacionada à profundidade da camada de mistura, variação da temperatura na água, e à cadeia alimentar. No intervalo de profundidade entre 0 m e 40 m, predominam Globigerinoides ruber (pink) e Globigerinoides ruber (white). As espécies Globigerina bulloides, Neogloboquadrina dutertrei e Globigerinella siphonifera predominam entre 40 m e 60 m de profundidade, ao passo que entre 60 m e 80 m de profundidade ocorrem Globorotalia menardii, Orbulina universa e Globigerina falconenis. O registro sedimentar das espécies de foraminíferos planctônicos encontrado na área de estudo reflete a biocenose, podendo assim ser utilizado em análises ambientais e paleoceanográficas. As assinaturas tafonômicas observadas refletem as condições hidrodinâmicas locais. / The present work focuses on the study of planktonic foraminifera on the southeast Brazilian continental margin between São Sebastião, SP and São Tomé, RJ. This was done by means of a survey of the existing species in the plankton. The seasonal and vertical distribution in the water column (0-100 m depth) of the planktonic foraminifera species was also determined. In addition, a comparison of the biocenose and of the tatocenose was carried out as well as a tafonomic analysis of the tests deposited in the bottom. This was done in order to evaluate the sedimentary record of these organisms and consider the possibility of using tafonomic signatures in planktonic foraminifera tests in order to better understand the hydrodynamic processes in the study area. For this, plankton samples collected in the summer and winter of 2002, as well as sediment samples, were analyzed. Methodologies common to planktonic foraminfera analysis were applied. The results show that there is a great seasonal difference in abundance and size of the planktonic foraminifera on the southeast Brazilian continental margin. The vertical distribution of these animals in the summer seems to be related to the depth of the mixture layer, variations in water temperature, and to the food chain. In the depth interval between 0 m and 40 m, there was a predominance of Globigerinoides ruber (pink) and Globigerinoides ruber (white). The species Globigerina bulloides, Neogloboquadrina dutertrei and Globigerinella siphonifera are predominate between 40 and 60 m. On the other hand, between 60 and 80 m Globorotalia menardii, Orbulina universa and Globigerina falconenis occur in greater quantities. The sedimentary record of the species of planktonic foraminifera found in the study area reflect the biocenose, being therefore appropriate for the usage in environmental and paleoceanographic analyses. The tafonomic signatures observed reflect the local hydrodynamic conditions.

A diversidade de organismos aquáticos de águas doces é ainda incompletamente conhecida no Brasil e atualmente graves problemas de alterações na qualidade das águas superficiais e destruição de habitats, têm levado a perdas de diversidade. O estudo da diversidade das comunidades planctônicas, incluindo uma análise ecológica dos fatores que alteram a riqueza e a abundância das espécies, é essencial para o entendimento dos processos controladores da diversidade. O presente trabalho visa analisar a diversidade da comunidade zooplanctônica em um reservatório e em um lago natural. As comunidades zooplantônicas da represa de Barra Bonita, SP e da lagoa Baixa Verde, MG, foram amostradas em diferentes periódicos, comparando-se a região limnética e a região litorânea. As principais variáveis físicas e químicas da água foram determinadas. As coletas de água foram feitas com garrafa de Van Dom e para as comunidades planctônicas com bomba de sucção, realizando-se coletas integradas na coluna d\'água e filtrando-se volumes de 100 a 200 litros, em redes de 20 e 68 micrômetros de abertura de malha para zooplâncton, respectivamente. As amostras foram fixadas com formol 4% e analisadas qualitativa e quantitativamente, utilizando-se bibliografias especializadas e recorrendo-se a especialistas para a identificação de algumas espécies. Com base em diferentes parâmetros físicos, químicos e biológicos, a represa de Barra Bonita pode ser considerada como um ambiente eutrófico e a lagoa Baixa Verde como um ambiente oligo-mesotrófico, corroborando classificações anteriormente realizadas por diversos autores. A comunidade zooplanctônica da represa de Barra Bonita foi bastante diversificada, sendo composta por 68 taxa, dos quais 31 taxa pertencentes aos Rotifera, 9 aos Cladocera e 8 aos Copepoda. Na lagoa Baixa Verde a riqueza de espécies foi baixa, tendo sido registrados 19 taxa, sendo 9 de Rotifera, 8 de Cladocera e 2 de Copepoda. A ocorrência das espécies Eurialona orientalis e Daphnia laevis na represa Barra Bonita constituem novos registros para aquele reservatório. Para a lagoa Baixa Verde, foram consideradas novas ocorrências de 8 espécies de Rotifera e 7 de Cladocera. A análise comparativa da diversidade e abundância do zooplâncton nas regiões limnéticas, revelou que no reservatório as maiores diversidades e densidades são encontradas na região limnética, ao passo que na lagoa a maior riqueza de espécies é encontrada na região litorânea, e a maior densidade na região limnética. As causas para estas diferenças são discutidas, em relação às características morfométricas, grau de trofia e a hipótese do distúrbio intermediário em reservatórios. / The biodiversity of most Brazilian waters is not completely known. Nowadays there are great problems related to the changes in water quality and habitat destruction, leading to biodiversity losses. Studies focusing the diversity of planktonic communities including analyses on main ecological factors determining the richness of species and population numbers are very important to the understanding of biodiversity controlling processes. The present work aimed to analyze the diversity of zooplankton communities of an artificial system, a reservoir and of a natural one, a lake. Zooplankton sampling was carried out in Barra Bonita reservoir, SP, and in Baixa Verde lake MG, in contrasting hydrological periods, comparing stations located in tlile limnetic and in the littoral region of the lakes. Main physical and chemical variables were determined. Water was collected by a Van Dorn bottle and plankton communities were sampled from the whole water column by a suction pump under low pressure. One hundred liters of water were filtered through nets of 20 um and 68 um mesh sizes for phytoplankton and zooplankton respectively. Samples were preserved on 4% formol solution for posterior qualitative and quantitative analyses using specialized literature. Based on physical, chemical and biological characteristics Barra Bonita was considered an eutrophic environment and Baixa Verde an oligo-mesotrófico one, corroborating the findings of previous studies. The analysis of zooplankton composition at Barra Bonita revealed a diversified and rich community represented by 68 taxa, 31 taxa belonging to Rotifera, 9 to Cladocera and 8 Copepoda. On the other hand, in lake Baixa Verde species richness was low, comprising 19 taxa, from which 9 of Rotifera, 8 of Cladocera and 2 of Copepoda. The occurrence of the species Eurialona orientalis and Daphnia laevis in Barra Bonita reservoir constitutes new records of species for that environment and also for Baixa Verde Lake 8 species of Rotifera and 7 of Cladocera are new occurrences. The comparative analysis of the diversity and abundance of zooplankton in the limnetic and in the littoral region revealed that in Barra Bonita reservoir the highest species richness is found in the limnetic zone whereas in Lagoa Verde the highest richness is found in the littoral zone. The reasons for these difterences are discussed in relation to morphometry, trophic state and intermediate disturbance hypothesis.

Para o desenvolvimento deste estudo, foi utilizado um testemunho de alta resolução coletado no talude da Bacia de Santos, em que foram realizadas análises de foraminíferos planctônicos e isótopos de oxigênio. Os resultados foram complementados por dados de razões de Fe/Ca e Ti/Ca e permitiram a compreensão do cenário paleoceanográfico no setor oeste do Atlântico Sul nos últimos 15 mil anos. Condições mais frias foram encontradas no início do registro até aproximadamente 8 mil anos A.P., com predomínio da fauna fria (G. truncatulinoides, N. dutertrei, e G. inflata) e valores mais altos de ? 18O. Maior produtividade também é sugerida pela componente principal 2 (CP2), relacionada à camada de mistura e caracterizada pela assembléia G. ruber (white) e G. sacculifer. As razões de Fe/Ca e Ti/Ca indicam maior aporte de terrígenos pela pluma do Rio da Prata para o ambiente oceânico, provavelmente contribuindo para fertilização das águas superficiais. A partir de 8 mil anos A.P. observa-se aumento dos valores da curva paleoclimática e diminuição progressiva dos valores de ? 18O. A CP2 apresenta valores máximos entre 10 e 5 mil anos A.P., indicando uma coluna de água mais quente e altamente estratificada. Neste período, apresentam-se os mínimos de razões de Fe/Ca e Ti/Ca, indicando um período mais seco, relacionado ao mínimo de insolação de verão no hemisfério sul e posicionamento da ZCIT mais ao norte. A partir de 5 mil anos A.P. até o final do registro, observa-se novamente menores valores da CP2 e razões crescentes Fe/Ca e Ti/Ca, indicando condições mais úmidas e de maior produtividade no Holoceno superior. / For this study, faunal changes in foraminifer\'s assemblages and oxygen stable isotopes were carried out on a high- resolution core retrieved from the slope of Santos Basin. The results, complemented with Fe/Ca and Ti/Ca ratios enabled the understanding of paleoceanografic changes occurred in the last 15 Kyr. Cold conditions were recognized in the late deglaciation until 8 mil Kyr B.P., characterized by the cold assemblage (G. truncatulinoides, N. dutertrei, and G. inflata) and higher values of ? 18O. The low values of principal component 2 (PC 2), related to the mixed layer and dominated by the species G. ruber (white) and G. sacculifer suggest enhanced surface productivity. The Fe/Ca and Ti/Ca ratios on the sedimentary record indicate a high terrigenous input from the Plata Plume outflow in the oceanic environment, which probably contributed to the fertilization of superficial waters. From 8 Kyr B.P., an increase in the paleoclimatic curve values and gradual reduction in the ? 18O were observed in the data. The PC 2 yields maximum values between 10 and 5 Kyr B.P., indicating warm and highly stratified water-column conditions. In this period, low Fe/Ca and Ti/Ca ratios point out dryer conditions, related to the low peak austral summer insolation and the ITCZ located farther north. From 5 mil Kyr B.P. decreasing PC 2 values and increasing Fe/Ca and Ti/Ca ratios may be a sign of more productivity and humid conditions in the late Holocene.

Dans le système climatique global, l’océan Atlantique Nord est considéré comme une région très sensible qui joue un rôle crucial pour la dynamique de l’hémisphère nord via la circulation méridienne de retournement de l'océan Atlantique (AMOC), dont fait partie le système de front/courant des Açores. La thèse a pour but d’analyser les interactions hydrographiques et climatiques complexes dans la région des Açores, pour le Pléistocène moyen­‐Holocène, par l’analyse des foraminifères planctoniques de deux carottes prélevées en 2013 (Oceanograflu 2013), dans le segment OH1 de la ride médio-atlantique. La thèse est structurée en trois chapitres/articles qui présentent les principaux résultats et leur interprétation. Le premier article a pour but d’établir le modèle d’âge le plus précis possible et de tracer l’histoire de la production/préservation des carbonates dans la région des Açores, au cours du dernier cycle glaciaire. Pour ce faire, les valeurs de carbonate et δ18OG.ruber des deux carottes ont été analysées à haute résolution. Par ailleurs, l’application de la «Modern Analog Technique» à l’analyse des assemblages des foraminifères planctoniques a permis d’estimer les variations de température des eaux de surface (SST-mat). Les courbes d’abondance des espèces résistantes et sensibles à la dissolution ont permis de mettre en évidence d’éventuels intervalles de plus forte dissolution. La partie supérieure de chaque carotte a été datée par spectrométrie de masse (AMS)14C sur les tests de foraminifères. Le modèle d’âge adopté se base également sur la corrélation entre les courbes de δ18OG.ruber et l’enregistrement haute résolution du δ18OG.bulloides de la carotte MD95-2042 (Shackleton et al. 2000) de la marge ibérique, récemment recalibrée en utilisant les données synthétiques LS16 de δ18O (Lisiecki and Stern 2016) relatives aux foraminifères benthiques. L’analyse spectrale a permis de démontrer que les oscillations des valeurs de carbonate et du δ18OG.ruber, lors des derniers 144ka, sont contrôlées par un forçage climatique (orbital et sub-orbital) dans la région des Açores. La comparaison des courbes de carbonate et celles des espèces résistantes à la dissolution, pour les deux carottes situées à des profondeurs différentes, a permis de montrer les variations verticales de la lysocline de la calcite, en particulier lors des évènements de refroidissement plus extrêmes, par exemple à 22,1 kyr avec une remontée de la lysocline de 1000m environ. Le deuxième article essaie de reconstituer la variabilité complexe de l’hydrographie et de la paléoproductivité de l’Atlantique centre Nord lors des derniers 144 kyr grâce à l’analyse des assemblages des foraminifères planctoniques combinée à celle des variations de la température des eaux de surface (SST­‐mat). Les fluctuations d’abondance d’espèces actuellement caractéristiques de masses d’eau et/ou des systèmes de front/courant dans l’Atlantique Nord ont été utilisées comme traceurs paléocéanographiques. Cette approche a permis d’évaluer la migration latitudinale/longitudinale du système de front/courant des Açores durant le Quaternaire récent ainsi que celle d’autres fronts et/ou courants caractéristiques de l’Atlantique centre Nord. Le troisième article se focalise sur la variabilité du groupe G. ruber gr. dans la région des Açores. G. ruber a été considéré comme un plexus regroupant plusieurs autres espèces et sous espèces. Plus récemment, des études moléculaires et géochimiques mis en évidence la présence de plusieurs génotypes au sein du plexus G. ruber, ce qui implique l’existence de plusieurs (sous­‐) espèces avec des modes de calcification et des préférences écologiques différentes. Malgré l’abondante littérature récente sur ce sujet, les liens entre ces différents génotypes, variants morphologiques, préférences écologiques, et modes de calcification ne sont pas encore très bien compris. (...) / In the global climatic system, the North Atlantic Ocean is considered as a highly sensitive region, which plays a crucial role in the Northern Hemisphere dynamics through the so­‐called Atlantic Meridional Overturning Circulation (AMOC) system, of which the Azores Front/Current System represents an important part. The main aim of the thesis is to reconstruct the complex hydrographic and climatic interactions in such a climatically­‐sensitive area during middle Pleistocene to Holocene through the analysis of the planktonic foraminifera from two cores collected in the OH1 segment of the Mid‐Atlantic Ridge (MAR) south‐westward of the Azores archipelago during the Oceanograflu 2013 cruise. The manuscript is structured in three chapters presenting the major results and their interpretation (...)

As assembléias dos foraminíferos planctônicos fósseis de dois testemunhos amostrados do Atlântico tropical oeste representativo dos últimos 30.000 anos foram analisadas junto com estimativas de paleotemperatura superficial e ∂18O e ∂13C do foraminífero planctônico Globigerinoides ruber \'branca\'. Estes resultados mostraram que durante o Último Máximo Glacial e durante os eventos de resfriamento de curta duração Heinrich 1 and Younger Dryas o Atlântico tropical oeste manteve altas paleotemperaturas superficiais. Este estudo sugere que durante este período o Atlântico tropical oeste ocorreu uma acumulação de sal e clor nesta porção do Atlântico como conseqüência do enfraqueciemnto do transporte de calor e sal através do equador. Ao final destes eventos a intensificação do transporte de calor e sal foi restabelecido, baixando a temperatura superficial aos valores conhecidos atuamente. Este estudo sugere que o Atlântico tropical oeste atuou como um reservatório de calor e sal durante a deglaciação. / The planktonic foraminiferal assemblages of two piston cores from western tropical Atlantic covering the last 30,000 years have been analysed together with paleoceanographic ANN sea surface temperature reconstruction and ?18O and ?13C of the shallow dwelling planntonic foraminifera Globigerinoides ruber \'white\'. These proxies reveal that during the Last Glacial Maximum and during the Heinrich 1 and Younger Dryas cold events, the western tropical experienced warm periods. This study suggest that during these warm intervals a pronounced accumulation of heat and salt occurred at western tropical Atlantic, as a result of cross-equatorial heat and salt transport decrease. At the end of these events, the intensification of cross-equatorial heat and salt transport cooled and freshened the western tropical surface waters. This study suggests the western tropical Atlantic served as a heat and salt reservoir during deglaciation.

A importância de estudos sobre a produção primária (PP) marinha é consenso devido ao seu papel no ciclo do carbono global. Técnicas rápidas e não invasivas para medição de taxas de PP foram desenvolvidas nas últimas décadas para melhorar a resolução espacial e temporal das aquisições de dados, além de suprir as desvantagens e lacunas deixadas pelos métodos clássicos que envolvem a incubação de amostras. Os objetivos deste trabalho são: (1) comparar duas técnicas mais novas, a Bio-óptica (PPabs) e a Fluorescência Ativa Variável (PPFire), com o método clássico de evolução de oxigênio pelo metabolismo da comunidade planctônica que estima a PP bruta (PPB), (2) e determinar a influência de variáveis oceanográficas e como elas podem predizer a PP no canal de São Sebastião ao longo de diferentes períodos amostrais (verões de 2014, 2016 e 2018, inverno de 2014 e primavera de 2015). A PPB variou entre 47,55 e 341,94 mg C m-3 d-1, a PPabs entre 73,7 &#177; 6,9 e 454,9 &#177; 25,8 mg C m-3 d-1 e a PPFire entre 9,0 e 57,8 mg C m-3 d-1 no verão de 2018. As relações entre os métodos foram significativas (PPB vs PPabs, p = 0,007, PPB vs PPFire, p = 0,01 e PPabs vs PPFire, p = 0,01). A partir de uma regressão linear múltipla, vimos que a PPB (p = 0,003) e PPFire (p < 0,001) foram previstas pela temperatura e pela concentração da clorofila-a, já a PPabs (p = 0,007) pelas duas variáveis adicionadas a salinidade. Esses resultados indicam que apesar dos métodos apresentarem magnitudes diferentes, informações adicionais sobre o ambiente são incorporadas por cada técnica. A PPB acrescenta informações quanto a comunidade planctônica como um todo, a PPabs sobre a composição pigmentar e de tamanhos de espécies e a PPFire sobre a fotofisiologia das células fitoplanctônicas. Quanto às condições oceanográficas, as relações com a temperatura e a salinidade indicam que os métodos são sensíveis a alteração de massas d\'água, como a Água Central do Atlântico Sul (ACAS), bem como a entrada de aporte continental por plumas de rios, que são responsáveis pela disponibilidade de luz e nutrientes que afetam a PP no canal. Concluindo, os métodos são complementares e podem variar de diferentes formas conforme a dinâmica local, no entanto, são significativamente proporcionais uns aos outros, o que indica a robustez entre as medidas das duas técnicas mais novas aqui comparadas. / There is a consensus of the importance of primary production (PP) studies due to its role on the global carbon cycle. Fast and non-invasive techniques to measure rates of PP were developed in the last few decades to improve temporal and spatial data acquisition, and to overcome disadvantages and gaps associated with classical methods using incubation of samples. The aim of this work are: (1) compare two newer techniques, Bio-optical (PPabs) and Active Variable Fluorescence (PPFire), to the classical method involving oxygen evolution by the planktonic community metabolism (PPB), and (2) determine the influence of oceanographic variables and investigate how they could predict PP in the São Sebastião channel. PPB varied between 47.55 and 341.94 mg C m-3 d-1, PPabs between 73.7 &#177; 6.9 and 454.9 &#177; 25.8 mg C m-3 d-1 and PPFire between 9.0 and 57.8 mg C m-3 d-1 in the summer of 2018. The relationships between methods were significant (PPB vs PPabs, p = 0.007, PPB vs PPFire, p = 0.01 and PPabs vs PPFire, p = 0.01). After a multiple linear regression test, we found that PPB (p = 0.003) and PPFire (p < 0.001) were predicted by temperature and chlorophyll-a concentration, however, PPabs (p = 0.007) was also predicted by salinity. These results indicate that despite the methods show different magnitudes, each one includes different information about the environment. The PPB adds overall information about the planktonic community, while the PPabs adds pigment composition and species size and the PPFire adds phytoplankton cell photophysiology. We found correlations with the different PPs and temperature and salinity indicating that the three methods are sensitive to water mass changes, as the South Atlantic Central Water (SACW) and the intrusion of river plumes in the channel, both responsible for light and nutrients availability. In conclusion, the three methods are complementary and could vary in different ways due to local dynamics. However, they are proportional to each other, showing strength to the use of the two newest techniques (PPabs and PPFire).

The aim of this study is to delineate the Campanian-Maastrichtian boundary by using planktonic foraminifers. In this manner, Kokaksu Section (Bartin, NW Anatolia) was selected and the Akveren Formation, characterized by a calciturbiditic-clayey limestone and marl intercalation of Campanian-Maastrichtian age, was examined. 59 samples were emphasized for position of boundary. Late Campanian-Maastrichtian planktonic foraminifers were studied in thin section and by washed samples. Two different biostratigraphical frameworks have been established. Globotruncanid zonation consists of Campanian Globotruncana aegyptiaca Zone, Upper Campanian-Middle Maastrichtian Gansserina gansseri Zone and Upper Maastrichtian Abathomphalus mayaroensis Zone, whereas heterohelicids biozonation includes Campanian Pseudotextularia elegans Zone, Lower Maastrichtian Planoglobulina acervuloinides Zone, Middle Maastrichtian Racemiguembelina fructicosa Zone and Upper Maastrichtian Pseudoguembelina hariensis Zone. Campanian-Maastrichtian boundary was determined as the boundary between Pseudotextularia elegans and Planoglobulina acervuloinides zones and Cretaceous-Tertiary boundary was designated by total disappearance of Late Cretaceous forms. Heterohelicid biozonation has been established in this study for the first time in Turkey. Collecting 300 individuals from each sample, diversity and abundance of assemblages were analyzed in terms of genus and species. ir evaluation of are important in observation of evolutionary trends and ecological changes. Moreover, evolution of different morphotypes is important in this evaluation. Such a study is new in Turkey in terms of examination of responses of planktonic foraminifers to environmental changes. Taxonomic framework has been constructed to define each species and differences of comparable forms have been discussed. Both scanning electron microscope (SEM) photographs and thin section photographs were used in order to show se distinctions.

An integrated micropaleontological, mineralogical and sequence stratigraphical investigation was carried out across the Cretaceous/Paleogene (K/P) boundary in the Haymana basin, Turkey. A 29.41 m thick boundary section consisting of limestones and marls was measured and 90 samples were analyzed. Biostratigraphic and chronostratigraphic works are based on the planktonic foraminifera. 64 planktonic species were identified and 5 biozones were established. The biozones are, in ascending order, Planoglobulina acervulinoides zone, Racemiguembelina fructicosa zone, Pseudoguembelina hariaensis zone for the Late Maastrichtian / Guembelitria cretacea (P0) zone and Parvulorugoglobigerina eugubina (P1a) zone for the Early Danian. In order to detect the mineralogical changes across the boundary bulk and clay minerals were analyzed using X-ray diffractometry (XRD). Calcite, quartz,feldspar and the clay minerals composed of smectite (montmorillonite) and chlorite are the main components of the rocks. A decrease in calcite and an increase in the detrital minerals (quartz, feldspar) and the clay minerals were detected in the boundary beds. In order to find out the depositional history of the area a detailed microfacies study was performed and 10 microfacies type were determined. The microfacies types defined correspond to slope to basin environment. Based on microfacies analyses, the sequence stratigraphic framework of the boundary beds was constructed. K/P boundary beds were recorded in the transition of transgressive systems tract to highstand systems tract, coinciding with a maximum flooding surface. These beds show a similar pattern with many other K/P boundary beds in different locations of the world indicating eustatic sealevel variations overprint the tectonic control in the basin.

The aim of this study is to establish the planktonic foraminiferal biozonation, to construct the sequence stratigraphical framework and to determine the foraminiferal response to sedimentary cyclicity in the sedimentary sequence spanning Upper Cretaceous-Paleocene in the Haymana basin (Central Anatolia, Turkey). In order to achieve this study, the stratigraphic section was measured from sedimentary sequence of the Haymana, Beyobasi and YeSilyurt formations. The sedimentary sequence is mainly characterized by flyschoidal sequence that is composed of alternating of siliciclastic and carbonate units. On the account of the detailed taxonomic study of planktonic foraminifers, the biostratigraphic framework was established for the Maastrichtian-Paleocene interval. The biozonation includes 7 zones / Pseudoguembelina hariaensis, P&amp / #945 / , P1, P2, P3, P4 and P5 zones. The Cretaceous-Paleogene (K/P) boundary was delinated between the samples HEA-105 and 106. In order to construct the sequence-stratigraphical framework, the A, B, C and D-type meter-scale cycles were identified. Based on the stacking patterns of them, six depositional sequences, six third and two second order cycles were determined. Third order cycles coincide with the Global Sea Level Change Curve. On the account of the conducted petrographic analysis sandstone, mudstone, marl, limestone and muddy-limestone lithofacies were recorded in the studied samples. In order to demostrate the response of foraminifers to cyclicity, quantitative analysis has been carried out by counting the individuals of planktonic, benthonic foraminifers and ostracods. The best response to sedimentary cyclicity was revealed from planktonic foraminifers. The average abundance of planktonic foraminifers increases in the transgressive systems tract and decreases in the highstand systems tract.

O presente trabalho tem como enfoque o estudo de foraminíferos planctônicos, na margem continental Sudeste Brasileira, entre São Sebastião, SP e Cabo de São Tomé, RJ através do levantamento das espécies existentes no plâncton. Buscou conhecer a distribuição sazonal e vertical na coluna d?água (0 a 100 m de profundidade) das espécies de foraminíferos planctônicos, correlacionar a presença desses organismos a fatores abióticos e bióticos no meio ambiente. Comparar a composição da biocenose e da tanatocenose assim como, realizar análise tafonômica das carapaças depositadas no fundo oceânico, a fim de avaliar o registro sedimentar desses organismos e considerar a utilização de assinaturas tafonômicas em carapaças de foraminíferos planctônicos na compreensão dos processos hidrodinâmicos na área de estudo. Para isso, foram analisadas amostras de plâncton, coletadas no verão/2002 e inverno/2002, e amostras de sedimento. Foram aplicadas metodologias usuais em análises de foraminíferos planctônicos. Foi possível reconhecer que há grande diferença sazonal na abundância e no tamanho de foraminíferos planctônicos na margem continental Sudeste Brasileira. A distribuição vertical desses organismos no verão parece estar relacionada à profundidade da camada de mistura, variação da temperatura na água, e à cadeia alimentar. No intervalo de profundidade entre 0 m e 40 m, predominam Globigerinoides ruber (pink) e Globigerinoides ruber (white). As espécies Globigerina bulloides, Neogloboquadrina dutertrei e Globigerinella siphonifera predominam entre 40 m e 60 m de profundidade, ao passo que entre 60 m e 80 m de profundidade ocorrem Globorotalia menardii, Orbulina universa e Globigerina falconenis. O registro sedimentar das espécies de foraminíferos planctônicos encontrado na área de estudo reflete a biocenose, podendo assim ser utilizado em análises ambientais e paleoceanográficas. As assinaturas tafonômicas observadas refletem as condições hidrodinâmicas locais. / The present work focuses on the study of planktonic foraminifera on the southeast Brazilian continental margin between São Sebastião, SP and São Tomé, RJ. This was done by means of a survey of the existing species in the plankton. The seasonal and vertical distribution in the water column (0-100 m depth) of the planktonic foraminifera species was also determined. In addition, a comparison of the biocenose and of the tatocenose was carried out as well as a tafonomic analysis of the tests deposited in the bottom. This was done in order to evaluate the sedimentary record of these organisms and consider the possibility of using tafonomic signatures in planktonic foraminifera tests in order to better understand the hydrodynamic processes in the study area. For this, plankton samples collected in the summer and winter of 2002, as well as sediment samples, were analyzed. Methodologies common to planktonic foraminfera analysis were applied. The results show that there is a great seasonal difference in abundance and size of the planktonic foraminifera on the southeast Brazilian continental margin. The vertical distribution of these animals in the summer seems to be related to the depth of the mixture layer, variations in water temperature, and to the food chain. In the depth interval between 0 m and 40 m, there was a predominance of Globigerinoides ruber (pink) and Globigerinoides ruber (white). The species Globigerina bulloides, Neogloboquadrina dutertrei and Globigerinella siphonifera are predominate between 40 and 60 m. On the other hand, between 60 and 80 m Globorotalia menardii, Orbulina universa and Globigerina falconenis occur in greater quantities. The sedimentary record of the species of planktonic foraminifera found in the study area reflect the biocenose, being therefore appropriate for the usage in environmental and paleoceanographic analyses. The tafonomic signatures observed reflect the local hydrodynamic conditions.