Doutorado em Oceanografia Ambiental

URI Permanente para esta coleção

http://repositorio.ufes.br/handle/10/17531

Nível: Doutorado
Ano de início: 2007
Conceito atual na CAPES: 4
Ato normativo: Homologado pelo CNE(Portaria MEC Nº 609 de 14/03/2019) Publicação no DOU em 18/03/2019 Seç. 1, Pág. 63. Parecer CNE/CES nº 487/2018, Processo no 23001.000335/2018-51).
Periodicidade de seleção: Anual
Área(s) de concentração: Sistemas Costeiros e Marinhos
Url do curso: https://oceanografia.ufes.br/pt-br/pos-graduacao/PPGOA/detalhes-do-curso?id=1469

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Navegando Doutorado em Oceanografia Ambiental por Autor "Araújo, Tereza Cristina Medeiros de"

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    Morfologia de recifes submersos na plataforma de Abrolhos (Brasil): da resposta à variação do nível do mar, à heterogeneidade do habitat
    (Universidade Federal do Espírito Santo, 2025-06-25) Vieira, Fernanda Vedoato; Bastos, Alex Cardoso; https://orcid.org/0000-0002-1272-1134; http://lattes.cnpq.br/2951081353357019; https://orcid.org/0000-0002-5759-9566; http://lattes.cnpq.br/3147534317873473; Salles, Laura Silveira Vieira; http://lattes.cnpq.br/7435312200966903; Almeida, Narelle Maia de; https://orcid.org/0000-0003-2586-4502; http://lattes.cnpq.br/4905966563292686; Rebouças, Renata Cardia; https://orcid.org/0000-0001-7855-7296; http://lattes.cnpq.br/1196270104953172; Araújo, Tereza Cristina Medeiros de; https://orcid.org/0000-0003-2760-6566; http://lattes.cnpq.br/4130469620831742
    Submarine geomorphology directly controls the configuration of the marine landscape and benthic habitats and is primarily influenced by eustatic sea-level fluctuations, sedimentation rates, and accommodation space. During the last deglaciation, variations in sea-level rise rates resulted in periods of relative stabilization (stillstands) and rapid acceleration, shaping distinct geomorphological features on the continental shelf.Reefs play a central role in marine ecosystems and are regarded as priority areas for the establishment of marine protected areas, being fundamental to marine spatial planning. In addition, they act as sensitive indicators of the impacts of climate change. Submerged reefs, in turn, are products of oceanographic conditions and short- and long-term sea-level variations, reflecting in their position, morphology, and extent the history of environmental and ecological changes.The Abrolhos Continental Shelf hosts the largest reef province in the South Atlantic and represents the main study area for reef evolution on the Brazilian continental shelf. However, studies on submerged reefs along this platform remain incipient. Nevertheless, understanding the extent, evolution, and connectivity between these submerged reefs and the emergent reefs is essential to fill knowledge gaps regarding the genesis, evolution, morphology, and spatial distribution of the largest reef complex in the South Atlantic. The use of high-resolution multibeam bathymetry, combined with geomorphological analysis methods, constitutes the scope of this research, aiming to elucidate the processes of formation, evolution, and drowning of both previously known and still poorly mapped reefs on the Abrolhos Shelf.Based on morphological data, two main groups of submerged reefs were identified in the southern portion of the Abrolhos Shelf, between depths of 14 and 35 meters. These groups are associated with different seabed features, including linear forms (longitudinal and transverse), sedimentary banks, and incised valleys, indicating a diversity of geomorphological processes and distinct origins. In contrast, in the northern portion of the Abrolhos Shelf, high resolution acoustic mapping revealed more than 34,000 reef structures, ranging from pinnacles to banks, evidencing significant morphological heterogeneity. Finally, the areas were compared in terms of morphological aspects and correlated with post–Last Glacial Maximum eustatic events and the presence of remnant Pleistocene structures.Thus, the Abrolhos Continental Shelf preserves unique features that record paleoenvironmental changes, functioning as geological archives of deglacial pulses and sea-level variations. The interaction between eustasy, pre-existing topography, and sedimentation has shaped the present-day geodiversity, highlighting the importance of submerged reefs in understanding the evolution of the largest reef complex in the South Atlantic.
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    Vales incisos e seu papel como recifes mesofóticos na plataforma continental do Espírito Santo
    (Universidade Federal do Espírito Santo, 2021-06-25) Oliveira, Natacha de; Bastos, Alex Cardoso; https://orcid.org/0000000212721134; http://lattes.cnpq.br/2951081353357019; https://orcid.org/0000-0003-4969-6443; http://lattes.cnpq.br/1556550383071001; Vital, Helenice; https://orcid.org/0000-0003-0462-9028; http://lattes.cnpq.br/3595069999049968; Reboucas, Renata Cardia; https://orcid.org/0000-0001-7855-7296; http://lattes.cnpq.br/1196270104953172; Araújo, Tereza Cristina Medeiros de; https://orcid.org/0000-0003-2760-6566; http://lattes.cnpq.br/4130469620831742; Longo, Leila de Lourdes; https://orcid.org/0000-0002-5023-1486; http://lattes.cnpq.br/2447917111421642
    The pressure on the marine environment, increasing over the years, has led to studies to better understand and thus manage it, taking into account ecological, environmental and human factors. In this sense, there is the habitat mapping which is based on an interdisciplinary analysis of the seabed to understand which are the dominant and determining variables that control the distribution of benthic habitats and thus assist in management policies for these systems. Therefore, this work brings a multi-scale analysis of the Espírito Santo Continental Shelf (ESCS), in order to identify the habitat presents in it, highlighting the mesophotic habitats, and to understand the role of geomorphology, especially of incised valleys, as a structuring in the occurrence of these distinct habitat. This thesis combined indirect methods such as geomorphometry (Benthic Terrain Modeler), image segmentation (Object Based Image Analysis) and geoacoustic sampling (multibeam echo sounder), with direct sampling methods, these being video-imaging (Dropcam), water parameters and sedimentary coverage (through results of past works). In the course of the chapters and with the combination of the aforementioned methods, it was possible to observe a wide variety of habitat classes, 17 classes in total. In the three modes of detailing the study area (macro, meso and micro scale), it was evident that the shelf morphology derived from sea level fluctuations along with sediment input and carbonate production rates define the heterogeneity and pattern of habitat distribution. The more heterogeneous the sedimentary cover and the more varied the morphological gradient, greater potential of the areas for the development of epibenthic habitats and their diversity. The main morphological features were the incised valleys with their steep walls considered a legacy of marine regression and transgression. Along the valleys, rhodolith beds were also considered important mesophotic habitats, and both play fundamental ecological functions for the maintenance of biodiversity. The multi-scale study applied here, as well as the combination of methods, was very important to evidence certain habitats, allowing to increase the complexity of each habitat with each change in detail.