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Previous issue date: 2015-10-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O avan?o das t?cnicas de investiga??o submarina vem motivando uma s?rie de pesquisas para o reconhecimento detalhado das caracter?sticas de Plataformas Continentais em todo o mundo. A Plataforma Continental tropical brasileira, especificamente, carece de informa??es neste n?vel, apesar de sua relev?ncia, tanto para explora??o de recursos naturais, quanto para conserva??o marinha. Esta tese, desenvolvida na ?rea Leste da Plataforma do Rio Grande do Norte, utiliza dados in?ditos adquiridos a partir de m?todos hidroac?sticos (sondas mono, multifeixe e de varredura lateral) e amostras sedimentares, apresentando uma an?lise detalhada da paisagem submarina e das caracter?sticas da cobertura sedimentar. Integram ?s informa??es abi?ticas, padr?es de distribui??o bi?tica, que possibilitaram a caracteriza??o de habitat para fundos consolidados na ?rea de Pirangi. Este setor da plataforma, considerado raso e estreito, possui uma divis?o n?tida entre os sedimentos superficiais, que recobrem as zonas interna (terr?genos) e externa (biog?nicos). Evidenciando as varia??es de n?vel do mar, antigas posi??es de linha de costa est?o preservadas em quatro alinhamentos recifais, al?m de um paleo-canal formado em per?odo de mar baixo, conservado ainda hoje pelo pequeno aporte sedimentar. A plataforma faminta por sedimentos apresenta ainda fei??es onduladas, pequenas dunas submersas compostas por cascalhos biocl?sticos. A avalia??o conjunta de par?metros abi?ticos e do padr?o de distribui??o da cobertura b?ntica, baseada em grupos foco, permitiu a individualiza??o de habitat para as superf?cies recifais, demonstrando uma sucess?o de habitat desde os recifes praiais at? os recifes fundos. Esta an?lise pode ser replicada para outras ?reas de Plataforma Continental e contribuir para o delineamento de planos de gest?o, para o necess?rio manejo sustent?vel de recursos naturais, bem como para a delimita??o de propostas de conserva??o marinha. / The advance on marine underwater research techniques has motivated many efforts aiming to detail and recognize the Continental Shelf features worldwide. The Brazilian tropical Continental Shelf specifically lacks information at this level, despite its importance, both for natural resources exploitation, as for marine conservation. This thesis, developed in the eastern Rio Grande do Norte Continental Shelf (Northeastern Brazil), uses new data acquired from hydroacoustic methods (singlebeam, multibeam and side scan sonars) and sedimentary samples, presenting a detailed analysis of the underwater landscape and sedimentary coverage. Combine biotic distribution patterns with abiotic information, enabling habitat classification for hard sea-bottoms at Pirangi area. This narrow and shallow shelf sector has a sharp division between the surface sediments that covers the inner (terrigenous) and external (biogenic) zones. Pointing out the sea level variations, ancient shorelines are preserved in four reef alignments (beachrocks), plus a palaeochannel formed during low sea-level periods, still conserved by the small sand supply. The sediment-starved shelf also presents wavy features, small submerged dunes composed by bioclastic gravel. The assembled evaluation of abiotic parameters and distribution pattern of benthic coverage, based on specific groups, allowed the individualization of habitats for reef surfaces, showing a habitat succession from coastal to offshore reefs. This analysis can be replicated to other Continental Shelf areas and contribute for management plans, for the necessary natural resources sustainable management, as well to the delimitation of marine conservation proposals.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22049 |
| Date | 09 October 2015 |
| Creators | Pierri, Guilherme Cherem Schwarz |
| Contributors | 31481981404, Gomes, Moab Praxedes, 01252122403, Leite, Tatiana Silva, 02270395484, Costa Neto, Le?o Xavier da, 24181790444, Ara?jo, Tereza Cristina Medeiros de, 10869174487, Vital, Helenice |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM GEODIN?MICA E GEOF?SICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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