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| Registros recuperados: 24 | |
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| TAOUIL,ANDRÉ; YONESHIGUE-VALENTIN,YOCIE. |
| A Baía de Guanabara no decorrer da ocupação de suas margens sofreu uma continua degradação, levando-a a grandes modificações em seu entorno e a inúmeros danos ambientais. Além de uma significativa alteração paisagística, ocorreu também uma queda na qualidade de suas águas, devido ao lançamento de grande quantidade de efluentes não tratados (domésticos e industriais). Este trabalho teve como objetivo inventariar a flora algácea da praia de Boa Viagem (Niterói, RJ), compará-la com levantamentos realizados há três décadas. Os resultados mostraram desaparecimento de 30 táxons (49%) outrora existentes no início da década de 70 e o aparecimento de 14 espécies (23%). A flora atual é dominada por Ulva fasciata Delile e Enteromorpha compressa (L.) Nees, espécies... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Benthos; Flora; Guanabara Bay; Organic pollution; Seaweeds. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002012000004 |
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| Jablonski,Silvio; Azevedo,Alexandre de Freitas; Moreira,Luiz Henrique Arantes. |
| Despite the magnitude of domestic and industrial pollution, fishery yield registered in several landing points at Guanabara Bay, between April 2001 and March 2002 was slightly over 19,000 tons, corresponding to a value of US$ 4.8 million. When considered only the fish directed to the food market, the total catch amounted to about 6,300 tons and a value of US$ 3.7 million. Only a few fish species reached expressive densities compatible with commercial fisheries. Among small pelagic fish, Atlantic anchoveta and Brazilian sardinella were the dominant species, while in terms of demersal fish, croakers, mullets and catfishes comprised the main part of the catch. The absence of landing data previous to the spilling of 1.3 million liters of oil in January 2000... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fisheries; Fisheries statistics; Guanabara Bay; Brazil. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100010 |
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| FARIA,MARCIA DE MELO; SANCHEZ,BRAZ A.. |
| Geochemical and clay mineralogical studies of bottom sediments collected along the Macacu and Caceribu rivers and Guanabara Bay were carried out in order to investigate the relationship between major source areas and recent sediments of the bay. Clay mineralogy includes different groups with selective distribution conditioned by geomorphic features and depositional settings. Micaceous clay minerals are abundant near parent rock in the upper course, whereas kaolinite derived from varied sources is gradually concentrated towards the estuary. In the Guanabara Bay, kaolinite accumulates near river mouths, while micaceous clay minerals are converted into mixed layers in the estuary. Analyses of heavy metal contents reveal higher levels of Zn and Cu in sediments... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metal; Clay mineral; Sediment; Guanabara Bay. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000100010 |
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| Grohmann,Priscila A.. |
| During six consecutive months, sampling were made at three points located on Governador Island and three on Paquetá Island in Guanabara Bay, Rio de Janeiro, Brazil. Material was collected from dock pilings and rocks in the intertidal zone. In these samples, five species belonging to three families, Corynidae, Kirchenpaueriidae and Campanulariidae, were identified. The campanulariid species Obelia dichotoma Linnaeus, 1758, dominated at nearly all points sampled. The small number of species obtained in this survey is attributed to the intense pollution in the bay, which borders the second-largest industrial complex and the second-largest demographic center of Brazil. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Guanabara Bay; Rio de Janeiro; Brazil; Intertidal zone; Rocky shores. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000300010 |
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| Marques Júnior,Aguinaldo Nepomuceno; Crapez,Mirian Araujo Carlos; Barboza,Conceição Denise Nunes. |
| The present study aimed to evaluate the water quality of the Icaraí Sewage Outfall (ISEO) area. Sampling was conducted during winter and summer, and water samples were analyzed for dissolved oxygen, pH, temperature, salinity, dissolved inorganic nutrients (DIN), seston, particulate organic matter (POM), and pigments. Results showed that the water chemistry of the area suffers temporal and spatial variation. Great variability was also seen in the C:N:P ratios of POM (August, 112:30:1; December, 59:11:1) and in the DIN concentrations. Chlorophyll-a and ammonium concentrations (4.5 µg L-1 - 71.2 µg L-1, and 0.20 µM - 52,6 µM, respectively) characterized the ISEO area as eutrophic. The dispersal of the material was not effective under certain oceanographic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eutrophication; Sewage outfall; Water pollution; Nutrients; Guanabara Bay. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500014 |
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| Maciel,Thaís Rodrigues; Vaz-dos-Santos,André Martins; Caramaschi,Erica Pellegrini; Vianna,Marcelo. |
| ABSTRACT Ariids such as Genidens genidens are particularly susceptible to overfishing because of their complex reproductive mechanisms, which result in slow replenishment of stocks. In this study, we obtained data about the reproductive ecology of the catfish G. genidens in the Guanabara Bay estuary, Rio de Janeiro, Brazil, providing supporting information for management of its fishery. The sex ratio, mean size of each sex at first sexual maturation, and female fecundity were determined and the reproductive period was characterized. The males:females ratio was 1:2. The fecundity is low and increases proportionally to the females’ growth in total length and weight. The breeding season occurs during the warmest months of the year, with spawning extending... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Catfish; Fishery management; Guanabara Bay; Parental care; Reproductive strategy. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400208 |
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| CARVALHO,CÁSSIA DE; KEUNECKE,KARINA A.; LAVRADO,HELENA P.. |
| Abstract:Farfantepenaeus brasiliensis and F. paulensis are the most exploited shrimps of SE-S Brazilian coast. Our aim was to verify if adjacent nursery areas with different environmental condition (Sepetiba and Guanabara bays, SE Brazil) influence on shrimp populations (eg, CPUE) and body shapes. Samplings were carried out during 12 months in those bays ca. 85 Km far from each other. Carapace length (CL), total body length (TL), wet weight, abdomen size and TL/CL ratio were used to analyze variations in shape through regressions. In general, F. brasiliensis was 4 to 6 times more abundant than F. paulensis. The sex ratio differed from 1:1 in F. brasiliensis in both bays, with dominance of females, largest catches occur in autumn. However, differences in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Farfantepenaeus brasiliensis; Farfantepenaeus paulensis; Guanabara Bay; Morphometry; Pink shrimps; Sepetiba Bay. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000300601 |
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| Barreto,Cintia F.; Luz,Cynthia F.P. da; Baptista-Neto,José A.; Vilela,Claudia G.; Barth,Ortrud M.. |
| The sediment of a core collected about 2 km north of Paquetá Island, Guanabara Bay, was submitted to pollen analysis, in order to recognize the dynamics of the regional vegetation, and the anthropic influence. Radiocarbon dating of a sample next to the bottom of the core indicates an age of 4.210 ± 40 14C yrs B.P (calibrated age). It was possible to establish four palynological zones. Starting at the bottom of the core, a decrease in palynomorph concentration, the presence of degraded pollen grains and spores, and the predominance of ombrophilous forest pollen grains were observed in the basal portion of Zone I. These data may indicate the presence of an exuberant Atlantic Forest, dominated by a marine regressive event. The concentration of well-preserved... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pollen; Quaternary Palynology; Guanabara Bay; Paleoenvironment. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200005 |
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| Barth,Ortrud M.; Barreto,Cíntia F.; Coelho,Luciane G.; Luz,Cynthia F.P.. |
| Pollen analysis of a sediment sample obtained at 222 cm from the top of a drilling core collected in the Bay of Guanabara, Rio de Janeiro, was used as a tool to obtain more knowledge about pre-historical human living and environment. 14C datation revealed the age of 4210 years B.P. Most frequent pollen grains came from plants like Alchornea (Euphorbiaceae), Celtis (Ulmaceae), Lecythidaceae, Meliaceae, Ochnaceae and spores from forest Pteridophyta. Palynology and environmental studies revealed that agricultural activities could not be detected. The dense tropical rain forest was the dominant vegetation occurring in this region. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pollen; Paleoenvironment; Guanabara Bay; Rio de Janeiro; 4210 BP. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300009 |
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| BITENCOURT,JOSÉ A.P.; SILVA,FREDERICO SOBRINHO; SILVA-NETO,INÁCIO D. DA; CRAPEZ,MIRIAN A.C.. |
| Little is known about the role of protists and bacteria interactions during hydrocarbon biodegradation. This work focused on the effect of oil on protists from three different locations in Guanabara Bay and bacteria from Caulerpa racemosa (BCr), Dictyota menstrualis (BDm) and Laurencia obtusa (BLo) during a 96 h bioassay. Cryptomonadida (site 1, 2 and 3), Scuticociliatida (site 2) and Euplotes sp.1 and Euplotes sp.2 (site 3) appeared after incubation. The highest biomass observed in the controls was as follows: protist site 3 (6.0 µgC.cm–3, 96 h) compared to site 3 with oil (0.7 µgC.cm–3, 96 h); for bacteria, 8.6 µgC.cm–3(BDm, 72 h) and 17.0 µgC.cm–3(BCr with oil, 24 h). After treatment, the highest biomasses were as follows: protists at site 1 and BLo,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial consortia; Biomass; Free living protist; Guanabara Bay; Microbial loop; Petroleum. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000200745 |
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| Mendes,Fabiana; Figueiredo,Gisela M. de; Valentin,Jean L.. |
| The aim of this study was to describe the total density, densities of developmental stages and the reproduction period of Parasagitta friderici. Weekly samples were collected at one station in the channel of Guanabara Bay, Rio de Janeiro, during one year. Three vertical hauls were made for each sample, and P. friderici was separated, the developmental stages were identified, and body length (BL), ovary length (OL) and seminal vesicle width (SVW) were measured. Throughout the year P. friderici was the most abundant chaetognath species occurring in all four developmental stages, the densities of which varied from week to week. Higher densities of adults occurred in the spring, followed by peaks of juveniles in the summer. Although P. friderici seems to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chaetognath; Development stage; Guanabara Bay; Reproduction. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000100010 |
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| Registros recuperados: 24 | |
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