Caracteriza??o ecol?gica dos peixes recifais do Atol das Rocas

• Main Author: Pinheiro, Igor Emiliano Gomes
• Other Authors: CPF:14076306449
• Format: Others
• Language: Portuguese
• Published: Universidade Federal do Rio Grande do Norte 2014
• Subjects: Peixes recifais; Ecologia; Unidade de conserva??o; Complexidade estrutural; Reef fishes; Ecology; Conservation unit; Structural complexity; CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA::ECOLOGIA DE ECOSSISTEMAS
• Online Access: http://repositorio.ufrn.br:8080/jspui/handle/123456789/12508

Made available in DSpace on 2014-12-17T14:02:03Z (GMT). No. of bitstreams: 1 IgorEGP.pdf: 595581 bytes, checksum: 209975fcf9ad63e6f448af856207e81a (MD5) Previous issue date: 2006-12-06 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior === The present work was carried out at the Atol das Rocas (3? 51 S; 33? 49 W), the only atoll of the South Atlantic and the first Brazilian marine protected area. It was guided by the following hypothesis: the composition of the fish communities varies in agreement with the position of the pools; in other words, with or without permanent ocean connection. To test the validity of this hypothesis, the fish abundance was estimated in the connected pools (Barretinha/Barreta Falsa) and unconnected ones (Cemiteriozinho/?ncoras), carrying an ecological characterization of the fishes that inhabit these pools. Additionally, the structural complexity of the sampled places was also evaluated intending to verify the variations of the abundance and diversity of fishes in function to this factor. By the fact of this research was being carried out through the limits of a conservation unit, the samples was realized using visual census techniques. The results generated through uni and multivariate analytic techniques allowed the evidence that decisive factor in the density, richness and diversity variations of fishes are linked to the substratum type (Hard / Soft bottom) and not by the fact that the pool are or are not connected permanently to the ocean. In relation to the structural complexity; 58% of the variations in the diversity of fishes were attributed to changes in the structural complexity, while 12% of the variations in the abundance were attributed to the structural complexity === Este trabalho realizado no Atol das Rocas (3? 51 S; 33? 49 W), o ?nico atol do Atl?ntico Sul e a primeira ?rea marinha protegida brasileira, foi norteado pela hip?tese de que: a composi??o das comunidades de peixes varia de acordo com a posi??o das piscinas; ou seja, com ou sem conex?o permanente com o oceano. Para testar a validade desta hip?tese foram realizadas estimativas da abund?ncia de peixes em piscinas conectadas (Barretinha/Barreta Falsa) e n?o conectadas com oceano (Cemiteriozinho/?ncoras), realizando uma caracteriza??o ecol?gica dos peixes que habitam estas piscinas. Adicionalmente a complexidade estrutural dos locais amostrados tamb?m foi avaliada, com intuito de verificar varia??es da abund?ncia e diversidade de peixes em fun??o deste fator. Pelo fato desta pesquisa ter sido realizada dentro dos limites de uma unidade de conserva??o, as amostragens foram realizadas atrav?s do censo visual. Um total de 56 esp?cies foram identificadas no estudo piloto e durante as amostragens 48 destas foram observadas. Os resultados gerados atrav?s de t?cnicas anal?ticas uni e multivariadas permitiram constatar que o fator determinante nas varia??es de densidade, riqueza e diversidade dos peixes ? o tipo de substrato (consolidados/n?o consolidados) e n?o fato das piscinas estarem ou n?o conectada permanentemente com oceano. Com rela??o ? complexidade estrutural; 58% das varia??es na diversidade de peixes s?o atribu?das a mudan?as na complexidade estrutural enquanto que 12% das varia??es na abund?ncia s?o atribu?dos a este fator