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Registros recuperados: 24
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Seasonal variation in fish larvae at the entrance of Guanabara Bay, Brazil BABT
Castro,Marcia S. de; Bonecker,Ana Cristina Teixeira; Valentin,Jean L..
Studies were carried out to find out qualitative and quantitative temporal variations in fish larvae to relate seasonal, diurnal and tidal cycles to the density of larvae. Sampling was performed at one station, during two three-day periods in September 1995 and March 1996. Samples were collected during ebb and flood tides,in oblique hauls using a bongo net of 500 µm mesh size. A total of 42 taxa were identified. The families Engraulidae (Cetengraulis edentulus, Anchoa lyolepis) and Clupeidae (Harengula jaguana) had high mean densities and dominated both periods. Higher larval mean densities occurred in March, a period of relatively high temperatures and low salinities. The diurnal pattern of larval abundance consisted of high densities at night and low...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish larvae; Seasonal variation; Tidal cycle; Diurnal variation; Coastal bay; Guanabara Bay.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000100016
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Impact of the Icaraí Sewage Outfall in Guanabara Bay, Brazil BABT
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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Dynamic of decapod crustacean larvae on the entrance of Guanabara bay BABT
Fernandes,Lohengrin Dias de Almeida; Bonecker,Sérgio Luiz Costa; Valentin,Jean Louis.
In the present study, we observed seasonal variations in the density of decapod larvae as well as changes in density related to diurnal and tidal cycles. Among the decapod larvae collected, portunids and grapsids were the most abundant, especially during nocturnal ebb tides and near the surface. The same results were obtained in late winter (September) and late summer (March). These results demonstrated a flow of decapod larvae from Guanabara Bay to adjacent coastal waters. Luciferid (Lucifer faxoni) was the only group with high densities during flood tides and we suggest this is an evidence of L. faxoni larvae entering Guanabara Bay in late winter. Probably these changes in distribution of Lucifer faxoni among winter and summer were related to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crustacea Decapoda larvae; Zooplankton; Vertical Distribution; Vertical Migration; Dynamic; Guanabara Bay.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000600013
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Succession in rocky intertidal benthic communities in areas with different pollution levels at Guanabara Bay (RJ-Brazil) BABT
Breves-Ramos,André; Lavrado,Helena Passeri; Junqueira,Andrea de Oliveira Ribeiro; Silva,Sérgio Henrique Gonçalves da.
The aim of this study was to describe and compare the succession of intertidal benthic communities in two areas at Guanabara Bay, RJ, Brazil: Urca, an area submitted to moderated organic pollution and Catalão, an extremely polluted area. Three transects in each area were scraped one month before the beginning of this study in order to evaluate the recruitment (recruitment-treatments). Three other transects were monitored without manipulation (monitoring treatments). Species composition and relative abundance were evaluated monthly between September and December, 2000. A total of 26 species was found at Urca and 13 at Catalão. The percent cover of the most abundant organisms was not similar between treatments at Urca after four months, while in Catalão, the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic communities; Succession; Rocky intertidal zone; Guanabara Bay.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800012
Registros recuperados: 24
Primeira ... 12 ... Última
 

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