Made available in DSpace on 2014-08-13T14:50:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-18Bitstream added on 2014-08-13T18:00:41Z : No. of bitstreams: 1 000756566.pdf: 2911491 bytes, checksum: a727c0ce1a7a1932984166d3b88352c6 (MD5) / O presente estudo teve como objetivo investigar a distribuição espacial e temporal do camarão Nematopalaemon schmitti, em Macaé/RJ, bem como verificar a influência dos fatores ambientais (temperatura, salinidade, clorofila-a, textura e teor de matéria orgânica do sedimento) na abundância e distribuição da espécie. As coletas foram realizadas mensalmente, de julho/2010 a junho/2011, com um barco camaroneiro, equipado com redes de arrasto “double-rig”. Três pontos foram delimitados, distribuídos nas profundidades de 5 e 15m. Amostras de água e do sedimento foram coletadas para análise dos fatores ambientais. Obteve-se um total de 1200 exemplares. A distribuição dos indivíduos apresentou diferença entre as estações do ano e os pontos (ANOVA, p<0,05). Nematopalaemon schmitti foi mais abundante no inverno e no ponto três. Houve uma correlação da abundância com a concentração de menor teor de matéria orgânica no sedimento (Regressão Múltipla, p<0,05). A retração da ACAS e, consequentemente, a homogeneidade da temperatura da água de fundo no inverno influenciaram na distribuição temporal da espécie, assim como a maior abundância registrada no ponto três coincidiu com a maior concentração de clorofila-a do local, e pode ter modulado em termos espaciais. Apesar da correlação com o menor teor de matéria orgânica, a literatura aponta que os outros substratos como algas e fragmentos de madeira e o sedimento propriamente dito podem ser mais determinante em sua presença como visto para outras espécies de carídeos. Os fatores ambientais analisados mostraram-se fundamentais para o estabelecimento da espécie no litoral fluminense, que é uma área de limites de distribuição para muitas espécies, devido, principalmente, às características apresentadas na região de Cabo Frio/RJ / The present study aimed to investigate the spatial-temporal distribution of the shrimp Nematopalaemon schmitti from Macaé/RJ and to verify the influence of environmental factors (temperature, salinity, a-chlorophyll, texture and content of sediment organic matter) on the abundance and the distribution of the species. Samples were performed monthly, from July/2010 to June/2011, with a shrimp fishery boat equipped with a double rig net system. Three stations were sampled, ranging from 5 to 15 m deep. Water and sediment samples were collected for environmental analysis purposes. A total of 1200 individuals were collected. The distribution of the specimens showed a difference among seasons and among stations (ANOVA, p<0.05). Nematopalaemon schmitti was more abundant on the winter and at station three. There was a correlation of the abundance with the lowest concentration of organic matter in the sediment (Multiple Regression, p<0.05). The SACW retraction and the consequent homogeneity of bottom water temperature in the winter influentieted the temporal distribution of the species, as well as the highest abundance recorded at station three coincided with the highest concentration of a-chlorophyll at the region, and it may have been spatially modulated. Besides the correlation with the lowest content of organic matter, literature says that other substrates, such as algae, wood fragments and the sediment itself, can be more determinant on abundance, as seen for other caridean species. The environmental factors here analyzed shown to be essential for the establishment of this species at Rio de Janeiro coast, which is considered as a limit area for many species, mainly due to the conditions of Cabo Frio/RJ region

Made available in DSpace on 2014-06-11T19:35:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-09-24Bitstream added on 2014-06-13T20:07:15Z : No. of bitstreams: 1 almeida_ac_dr_botib.pdf: 859822 bytes, checksum: c0f964299ecfb510e7f66b1eea006b46 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / The spatial and temporal patterns of abundance and distribution of Xiphopenaeus kroyeri and its relationship with several environmental variables were compared over a range of 20 years. The abiotic and biotic data set were obtained monthly during two distinct study periods; period 1, from November 1988 to October 1989; and period 2, from November 2008 to October 2009, in seven permanent transects established within Fortaleza Bay, on the southeastern coast of Brazil. A remarkable sedimentation was observed between the first and the second study periods, which might have been caused by natural phenomena and/or human activities. While the variations in the bottom temperature and salinity were related mainly to the hydrodynamics of water masses present in the Ubatuba region. The abundance of X. kroyeri increased considerably over a range of 20 years. A total of 13 298 and 39 553 specimens were obtained throughout the sampling periods 1 and 2, respectively. The total abundance of the species and the abundance of males and females differed spatially, while the abundance of juveniles differed seasonally, during each study period (ANOVA, p < 0.05). Overall, the highest abundance of the species was recorded in those transects which the sediment was composed mainly by fine and very fine sand and silt and clay. The presence of algae and plant floating near the marine floor at Fortaleza Bay also favored the occurrence and settlement of X. kroyeri. Interestingly, during period 1 the species was most abundant in winter, when bottom temperature reached low mean value (21.6°C). While during period 2, the highest abundance of X. kroyeri was obtained in summer and fall. Concomitantly, the highest mean values of bottom temperature were recorded during these seasons (25.2 and 24.5°C, respectively). So, the... (Complete abstract click electronic access below)

Orientador: Rogerio Caetano da Costa / Banca: Vivian Fransozo Cunha / Banca: Fabiano Gazzi Taddei / Resumo: O presente estudo teve como objetivo investigar a distribuição espacial e temporal do camarão Nematopalaemon schmitti, em Macaé/RJ, bem como verificar a influência dos fatores ambientais (temperatura, salinidade, clorofila-a, textura e teor de matéria orgânica do sedimento) na abundância e distribuição da espécie. As coletas foram realizadas mensalmente, de julho/2010 a junho/2011, com um barco camaroneiro, equipado com redes de arrasto "double-rig". Três pontos foram delimitados, distribuídos nas profundidades de 5 e 15m. Amostras de água e do sedimento foram coletadas para análise dos fatores ambientais. Obteve-se um total de 1200 exemplares. A distribuição dos indivíduos apresentou diferença entre as estações do ano e os pontos (ANOVA, p<0,05). Nematopalaemon schmitti foi mais abundante no inverno e no ponto três. Houve uma correlação da abundância com a concentração de menor teor de matéria orgânica no sedimento (Regressão Múltipla, p<0,05). A retração da ACAS e, consequentemente, a homogeneidade da temperatura da água de fundo no inverno influenciaram na distribuição temporal da espécie, assim como a maior abundância registrada no ponto três coincidiu com a maior concentração de clorofila-a do local, e pode ter modulado em termos espaciais. Apesar da correlação com o menor teor de matéria orgânica, a literatura aponta que os outros substratos como algas e fragmentos de madeira e o sedimento propriamente dito podem ser mais determinante em sua presença como visto para outras espécies de carídeos. Os fatores ambientais analisados mostraram-se fundamentais para o estabelecimento da espécie no litoral fluminense, que é uma área de limites de distribuição para muitas espécies, devido, principalmente, às características apresentadas na região de Cabo Frio/RJ / Abstract: The present study aimed to investigate the spatial-temporal distribution of the shrimp Nematopalaemon schmitti from Macaé/RJ and to verify the influence of environmental factors (temperature, salinity, a-chlorophyll, texture and content of sediment organic matter) on the abundance and the distribution of the species. Samples were performed monthly, from July/2010 to June/2011, with a shrimp fishery boat equipped with a double rig net system. Three stations were sampled, ranging from 5 to 15 m deep. Water and sediment samples were collected for environmental analysis purposes. A total of 1200 individuals were collected. The distribution of the specimens showed a difference among seasons and among stations (ANOVA, p<0.05). Nematopalaemon schmitti was more abundant on the winter and at station three. There was a correlation of the abundance with the lowest concentration of organic matter in the sediment (Multiple Regression, p<0.05). The SACW retraction and the consequent homogeneity of bottom water temperature in the winter influentieted the temporal distribution of the species, as well as the highest abundance recorded at station three coincided with the highest concentration of a-chlorophyll at the region, and it may have been spatially modulated. Besides the correlation with the lowest content of organic matter, literature says that other substrates, such as algae, wood fragments and the sediment itself, can be more determinant on abundance, as seen for other caridean species. The environmental factors here analyzed shown to be essential for the establishment of this species at Rio de Janeiro coast, which is considered as a limit area for many species, mainly due to the conditions of Cabo Frio/RJ region / Mestre

Orientador: Adilson Fransozo / Banca: Roberto Munehisa Shimizu / Banca: Fúlvio Aurélio de Moraes Freire / Banca: Gustavo Monteiro Teixeira / Banca: Rogério Caetano da Costa / Resumo: Não disponível / Abstract: The spatial and temporal patterns of abundance and distribution of Xiphopenaeus kroyeri and its relationship with several environmental variables were compared over a range of 20 years. The abiotic and biotic data set were obtained monthly during two distinct study periods; period 1, from November 1988 to October 1989; and period 2, from November 2008 to October 2009, in seven permanent transects established within Fortaleza Bay, on the southeastern coast of Brazil. A remarkable sedimentation was observed between the first and the second study periods, which might have been caused by natural phenomena and/or human activities. While the variations in the bottom temperature and salinity were related mainly to the hydrodynamics of water masses present in the Ubatuba region. The abundance of X. kroyeri increased considerably over a range of 20 years. A total of 13 298 and 39 553 specimens were obtained throughout the sampling periods 1 and 2, respectively. The total abundance of the species and the abundance of males and females differed spatially, while the abundance of juveniles differed seasonally, during each study period (ANOVA, p < 0.05). Overall, the highest abundance of the species was recorded in those transects which the sediment was composed mainly by fine and very fine sand and silt and clay. The presence of algae and plant floating near the marine floor at Fortaleza Bay also favored the occurrence and settlement of X. kroyeri. Interestingly, during period 1 the species was most abundant in winter, when bottom temperature reached low mean value (21.6°C). While during period 2, the highest abundance of X. kroyeri was obtained in summer and fall. Concomitantly, the highest mean values of bottom temperature were recorded during these seasons (25.2 and 24.5°C, respectively). So, the... (Complete abstract click electronic access below) / Doutor