Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation

Gonzalez, Alessandra M.; Paranhos, Rodolfo; Andrade, Luciana Segura de; Valentin, Jean Louis

doi:10.1590/s1516-89132000000500008

Cited by 10 publications

(9 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Carvalho et al (2003) and Coveney and Wetzel (1995) also did not find a relationship between the chlorophyll and the bacterioplankton, during the studies carried out in oligotrophic and mesotrophic environments. The dependence of bacterioplankton of dissolved organic carbon released by the phytoplankton (Kisand et al, 2001) and the effect of the bacterivory in the control of the populations (Krstulovic et al, 1997) was more typical in the eutrophized environments (Gonzalez et al, 2000). Moreover, the low levels of chlorophyll denoted the importance of bacterioplankton for the trophic structuring of this environment, where significant relation between the bacteria and the phytoplankton was not observed.…”

Section: Discussionmentioning

confidence: 99%

Seasonal and spatial distribution of Bacterioplankton in a fluvial-lagunar system of a tropical region: density, biomass, cellular volume and morphologic variation

Araújo

Godinho

2008

Braz. arch. biol. technol.

View full text Add to dashboard Cite

The temporal and spatial fluctuations of Bacterioplankton in a fluvial-lagunar system of a tropical region (Pitimbu River and Jiqui Lake, RN) (R=0.55; p=0.02) and vibrio (R=0.53; p=0.03). Significant spatial differences of biomass (Mann Whitney: p=0.01) and cellular volume of the morphotypes (Mann Whitney: p=0.003) were found between the sampling sites. The strong positive correlations of the water temperature and oxygen with bacterioplankton showed a probable high bacterial activity in this system.

show abstract

Section: Discussionmentioning

confidence: 99%

Seasonal and spatial distribution of Bacterioplankton in a fluvial-lagunar system of a tropical region: density, biomass, cellular volume and morphologic variation

Araújo

Godinho

2008

Braz. arch. biol. technol.

View full text Add to dashboard Cite

show abstract

“…By contrast, some dissolved inorganic nutrient concentrations obtained in winter wereextremely high when compared to FEEMA's station g64, and just comparable to stations placed in inner, highly degraded regions, of Guanabara Bay (e.g. Station g20 in Governador Island) (Gonzalez et al, 2000) ( Fig. 3).…”

Section: Iseo and Water Qualitymentioning

confidence: 75%

Impact of the Icaraí Sewage Outfall in Guanabara Bay, Brazil

Júnior

Crapez

Barboza

2006

Braz. arch. biol. technol.

View full text Add to dashboard Cite

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 conditions.
O presente estudo teve por objetivo avaliar a qualidade da água na área do Emissário de Esgoto de Icaraí (ISEO). A amostragem foi realizada durante o inverno e o verão, e as amostras de água foram analisada quanto ao oxigênio dissolvido, pH, temperatura, salinidade, nutrientes inorgânicos dissolvidos (NID), seston, matéria orgânica particulada (MOP) e pigmentos. Os resultados mostraram que a química da água apresenta variações temporal e espacial. Grande variabilidade foi também observada nas razões C:N:P do MOP (Agosto, 112:30:1; Dezembro, 59:11:1) e nas concentrações de NID. As concentrações de clorofila-a e amônia (4.5 µg L-1 - 71.2 µg L-1, e 0.20 µM - 52,6 µM, respectivamente) caracterizam a área do ISEO como eutrófica. A dispersão do material não é efetiva em certas condições oceanográficas

show abstract

“…Triplicate samples (1.7 ml) were incubated for 1 h in sterile 2.0 ml screwcap tubes with L-[4, 5- ) at a 10 nM final concentration, based on previous saturation curves (Gonzalez et al 2000). One tube was amended with 90 µl 100% ice-cold trichloroacetic acid (TCA) as a killed control.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of bacterial carbon metabolism at the entrance of a tropical eutrophic bay influenced by tidal oscillation

Guenther¹,

Paranhos²,

Rezende³

et al. 2008

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Bacterial metabolic rates were assessed at the entrance to Guanabara Bay, SE Brazil, during the summer (i.e. wet) season, in order to evaluate short-term effects of tidal oscillation on the magnitude of carbon flow through the bacterioplankton. Bacterial production (BP), respiration (BR) and abundance, phytoplankton production and biomass, particulate and dissolved organic matter (POM and DOM) concentrations and elemental composition, nutrient concentrations and hydrological profiles were estimated at a fixed station during 3 consecutive days with intervals of 3 h, in surface and bottom (20 m) layers. The study period covered the end of the spring tide and the beginning of the neap tide. Bacterial metabolic rates were highly variable, and a small fraction of the dissolved organic carbon (DOC) pool was used by bacterioplankton (DOC turnover: 23 to 71 d). The input of allochthonous DOC, inferred from DOM elemental composition (C:N:P surface~1 50:9:1; C:N:P bottom 245:6:1), and temperature were the main controlling factors of bacterial carbon metabolism. Although the magnitude of carbon flow through the bacterioplankton was highly variable, there were nevertheless consistent differences between layers. At the surface, the particulate organic carbon (POC) production (~14.3 µM C h -1 ), mainly due to phytoplankton, was higher than BR, and bacterioplankton acted equally as POC producers and DOM remineralizers (bacterial growth efficiency ~52%). Near the bottom, BR was equivalent to total POC production (~0.3 µM C h -1 ) and higher than BP (~0.05 µM C h -1 ), and thus bacteria acted mostly as a DOM sink. This study highlights the importance of short-term variations in carbon flow through bacteria for understanding the carbon cycle of estuarine systems. KEY WORDS: Bacterial production · Bacterial respiration · Bacterial growth efficiency · Carbon flux · Guanabara Bay · EstuaryResale or republication not permitted without written consent of the publisher Aquat Microb Ecol 50: 123-133, 2008 ration (BR), which represent, respectively, the amount of carbon incorporated into bacterial biomass and that used for ATP generation and thus lost as CO 2 (Jahnke & Craven 1995, del Giorgio et al. 1997.The sum of BP and BR provides an estimate of the total amount of organic carbon assimilated by bacteria, the bacterial carbon demand (BCD), as well as the proportion of carbon actually converted into bacterial biomass, the bacterial growth efficiency (BGE). The latter is a measure of the physiological state of bacterial cells, and can also be used as an indicator of the bacterioplankton role in a system: a high BGE indicates that bacteria are more important as a source of particulate organic matter, while a low BGE indicates that they act mainly as a sink of organic matter and a source of CO 2 and other inorganic nutrients (del Giorgio & Cole 1998).Estuaries and coastal bays are complex hydrodynamic systems, under both oceanic and terrestrial influence, driven by riverine input on the one hand and tidal oscillation on the ...

show abstract

Bacterial production in Guanabara Bay (Rio de Janeiro, Brazil) evaluated by ³H-leucine incorporation

Abstract: ABSTRACT

Cited by 10 publications

References 21 publications

Seasonal and spatial distribution of Bacterioplankton in a fluvial-lagunar system of a tropical region: density, biomass, cellular volume and morphologic variation

Seasonal and spatial distribution of Bacterioplankton in a fluvial-lagunar system of a tropical region: density, biomass, cellular volume and morphologic variation

Impact of the Icaraí Sewage Outfall in Guanabara Bay, Brazil

Dynamics of bacterial carbon metabolism at the entrance of a tropical eutrophic bay influenced by tidal oscillation

Contact Info

Product

Resources

About