Navegando por Assunto "Costa - Amazônia"

Agora exibindo 1 - 7 de 7

Acesso aberto (Open Access)
Capacidade de carga recreacional, percepção dos usuários e qualidade da água em três praias turísticas da Costa amazônica
(Universidade Federal do Pará, 2011-08-29) SOUSA, Rosigleyse Corrêa de; COSTA, Rauquírio André Albuquerque Marinho da; http://lattes.cnpq.br/4504677939464624; PEREIRA, Luci Cajueiro Carneiro; http://lattes.cnpq.br/9883400404823218
Acesso aberto (Open Access)
Costa de manguezais de macromaré da Amazônia: cenários morfológicos, mapeamento e quantificação de áreas usando dados de sensores remotos
(2005-12) SOUZA FILHO, Pedro Walfir Martins e
De acordo com o Atlas de Manguezais, este ecossistema representa 8% de toda a linha de costa do planeta e um quarto da linha de costa da zona tropical, perfazendo um total de 181.077 km2. Este trabalho objetiva quantificar a extensão dos manguezais de macromaré da costa nordeste do Pará e noroeste do Maranhão, aqui denominada de Costa de Manguezais de Macromaré da Amazônia (CMMA). O reconhecimento das áreas de manguezais e sua quantificação foram realizados a partir da utilização de imagens Landsat-7 ETM+, adquiridas em 1999 e 2000 e de um sistema de informações geográficas (SIG). A integração dos dados de sensores remotos, dados geológicos e oceanográficos permitiu o reconhecimento de cinco setores geomorfológicos, que abrangem uma superfície total de 7.591 km2 de manguezais. Esta área representa a maior faixa de manguezais contínuos do planeta e corresponde a 56,6% dos manguezais do Brasil. Medidas prioritárias de conservação dos manguezais da Amazônia devem ser tomadas e pesquisas que busquem a melhor compreensão deste complexo e importante ecossistema devem ser financiadas e desenvolvidas.
Acesso aberto (Open Access)
Ecomorphological patterns of the fishes inhabiting the tide pools of the Amazonian Coastal Zone, Brazil
(2013) SOARES, Bruno Eleres; RUFFEIL, Tiago Octavio Begot; MONTAG, Luciano Fogaça de Assis
The present study was based on the identification of the ecomorphological patterns that characterize the fish species found in tide pools in the Amazonian Coastal Zone (ACZ) in the Pará State, Brazil. Representatives of 19 species were collected during two field campaigns in 2011. The dominance, residence status, and trophic guild of each species were established, and morphometric data were obtained for up to 10 specimens of each species. A total of 23 ecomorphological attributes related to locomotion, position in the water column, and foraging behavior were calculated for the analysis of ecomorphological distance. Principal Component Analysis (PCA) was utilized for the evaluation of ecomorphological attributes that explained the variation among species. Mantel Test was used to correlate the taxonomic distance with species' morphological patterns and a partial Mantel Test to analyze the correlation among trophic guilds and ecomorphological patterns, controlling the effects of taxonomic distance among species. The analyses revealed two principal axes of the variation related to locomotion, correlated with the width of the caudal peduncle and the shape of the anal fin, as well as the influence of taxonomic distance on the ecomorphological characteristics of the different species. The dominant and resident species both presented a reduced capacity for continuous swimming. The two principal axes identified in relation to the position of the fish in the water column were correlated with the position of the eyes, the area of the pelvic fin, and body shape, with evidence of the influence of taxonomic distance on the morphology of the species. PCA grouped species with pelagic habits with benthonic ones. In the case of foraging behavior, the two principal axes formed by the analysis correlated with the size of the mouth, eye size, and the length of the digestive tract. Species of different guilds were grouped together, indicating a weak relationship between morphology and foraging behavior, and no relationship was found with taxonomic distance. The resident and dominant species in the tide pools of the ACZ present sedentary habits, with little evidence of the influence of taxonomic distance on the use of habitats or morphology, which was a poor indicator of foraging strategies, and showing that phylogenetically distant species could present similar ecomorphological patterns.
Acesso aberto (Open Access)
Environmental sensitivity index (ESI) mapping of oil spill in the amazon coastal zone: the PIATAM Mar project
(2009) SOUZA FILHO, Pedro Walfir Martins e; PROST, Maria Thereza Ribeiro da Costa; MIRANDA, Fernando Pellon de; SALES, Maria Emília Cruz; BORGES, Heloisa Vargas; COSTA, Francisco Ribeiro da; ALMEIDA, Edson Faria de; NASCIMENTO JUNIOR, Wilson da Rocha
The importance of environmental monitoring is clear from the many oil spills that have occurred over the past three decades. This has encouraged both companies and the public sector involved in the prevention and response to these accidents to develop efficient procedures to minimize the damage caused by accidents involving oil spill. This study reviews the history of oil spill accidents in Brazil and examines how these events have contributed to the development of technological research through partnerships involving oil companies, government, universities and research institutes, with the emphasis on the Amazon coastal zone. As a result, environmental sensitivity indexes (ESIs) for oil spill have been developed specifically for the Amazon coast, where fluvial and marine processes take place in the estuary of the world's largest river system. Perspectives on research and emergency response procedures are presented, with the primary objective of conserving the social-environmental diversity of the planet's most important tropical region.
Acesso aberto (Open Access)
Fusão de dados multisensor para a identificação e o mapeamento de ambientes flúvio-estuarinos da Amazônia
(2009) GONÇALVES, Fabrício Dias; SOUZA FILHO, Pedro Walfir Martins e; PARADELLA, Waldir Renato; MIRANDA, Fernando Pellon de
Multisensor data fusion has been widely used in response to complementary nature of many data sets. This paper compares the results of four different data fusion methods used to merge Landsat-7 ETM+ and RADARSAT-1 Wide 1 data. The comparison was based on spectral characteristics of images using statistical and visual analyses of generated products. Four methods were used in the Landsat-7 ETM+ and RADARSAT-1 W1 data fusion: i) The best three bands combination(Landsat-7) based OIF (Optimum Index Factor) selection were merged with RADARSAT-1 data; ii) Decorrelation stretch was applied in the three bands (Landsat-7) selected by OIF and merged with RADARSAT-1 image; iii) PCA (Principal Component Analysis) to six reflective ETM+ bands (1, 2, 3, 4, 5 and 7) and posterior fusion of the three first Principal Components (PC1, PC2, PC3) with SAR; iv) A new approach SPC-SAR (Selective Principal Component - Synthetic Aperture Radar). The SPC-SAR product presented the best performance in the identification of coastal features and allowed the most effective enhancement of the different environments.
Acesso aberto (Open Access)
Influência da dinâmica atmosférica na produção de serapilheira em um manguezal da costa amazônica.
(Universidade Federal do Pará, 2019-02-19) SOUZA, Hyago Elias Nascimento; VITORINO, Maria Isabel; http://lattes.cnpq.br/2313369423727020
This work aimed to investigate the influence of atmospheric dynamics on litterfall production in the Cuiarana mangrove, Salinópolis, Amazon Coast. The seasonal rainfall variation was analyzed along with the precipitating systems on the Amazon coast and its influence on the variability of litterfall production. It was also characterized the temporal variation of the direction and speed of the wind and its influence on the spatiotemporal production of litterfall. In a mangrove forest, 3 sample plots were delineated with 3 mangrove species Rizophora mangle, Avicennia germinans and Laguncularia racemosa. In each plot, 4 traps 1 m2 were randomly installed. Meteorological data were obtained from the Micrometeorological Tower of the UFRA located in the study area. The main statistical methodologies used were two-way and one-way ANOVA, linear regression analysis (p <0.05) and Principal Components Analysis (PCA). The results show that the temporal variation of precipitation is modulated by different meteorological systems, where the months of March, April and May appear as the region's rainiest quarter. The annual distribution of wind direction showed predominance in the eastern (E), frequency of winds with higher velocity were recorded in the second semester. In the litterfall production there was a significant difference between the values of monthly production and between the fractions. The annual total litter production was 9.4 ± 0.06 Mg ha-1 year-1, where 67% was composed by the leaf fraction. Leaves had negative trends with precipitation, but woody and reproductive material had positive trends. The ACP shows in 4 components negative correlation with reproductive material and positive correlation with wood associated with the temporal variation of winds and rainfall.
Acesso aberto (Open Access)
Reconhecimento e mapeamento dos ambientes costeiros para geração de mapas de ISA ao derramamento de óleo, Amazônia oriental
(2009) BOULHOSA, Messiana Beatriz Malato; SOUZA FILHO, Pedro Walfir Martins e
Accidents related to exploration and oil transport are a threat to coast zones around the world. Oil spills are an ecological disaster that may cause irreparable damage to the environment. In the northeast cost of Pará state the intense flow of ships and rafts transporting petroleum and flowed, then the need to establish prevention strategies and administration of the environmental sensitivity about the oil spills in a certain part of Pará state northeast cost. The methodology consisted on processing digital images from remote sensors in the Landsat ETM+7 associated to data from the SRTM (shuttle radar topography mission) digital model of elevation, and to the field data collected in a GIS (geographical information system) environment. The most important results allowed: recognizing and describing five main geomorphological; identifying and classifying nine units of Environmental Sensitivity Rates (ISA) and creation of the Environmental Sensitivity Rates map to oil spill. The remote sensors techniques and SIG proved to be important tools for recognizing coast environments and for generating proposed maps.