Heterotrophic bacteria abundances in Rodrigo de Freitas Lagoon (Rio de Janeiro, Brazil)

Gonzalez, Alessandra M.; Paranhos, Rodolfo; Lutterbach, Márcia S.

doi:10.1590/s1517-83822006000400005

Cited by 13 publications

(14 citation statements)

References 14 publications

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“…Values of dissolved oxygen in the water, both at the surface and the bottom, showed high variability, as previously reported by GONZALEZ et al (2006). Dissolved oxygen values showed an overall downward trend during summer time.…”

Section: Zooplankton Communitysupporting

confidence: 86%

Zooplankton of an urban coastal lagoon: composition and association with environmental factors and summer fish kill

Souza¹,

Branco²,

Domingos³

et al. 2011

Zoologia (Curitiba, Impr.)

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Zooplankton may be regarded as a sensitive tool for monitoring environmental variations in coastal lagoons due to their ability to immediately react to changes in the water column trophic features and salinity levels. As a coastal lagoon with a broad history of anthropic influence, Rodrigo de Freitas Lagoon (Rio de Janeiro, Brazil) is widely used for water sports and artisanal fishing. The present study aimed to expand the knowledge base about zooplankton in the Rodrigo de Freitas Lagoon by assessing the composition and time-spatial distribution of the major zooplankton groups. Samples were collected fortnightly from at four distinct sampling points August 2001 to July 2002. At each point, salinity, temperature, dissolved oxygen and water transparency were measured. During the study period, the lagoon behaved as an spatially homogeneous environment in what regards the abiotic variables. However, all these variables showed significant differences along the time, mainly related to seasonality (air temperature and rainy and dry periods). The zooplankton community showed low taxonomic richness, with the predominance of species commonly found in coastal lagoons, especially with mesohaline conditions, as well as those found in estuaries. An interesting fact was the rise in zooplankton abundance at all sampling points right after a fish kill event. Such increase was caused mainly by the Brachionus plicatilis O.F. Müller 1786 species. Thus, the zooplankton community was affected by physical and chemical factors, mainly by the dissolved oxygen decline event and variations in the influx of seawater into the lagoon. In addition, phytoplankton availability and fish predation pressure were suggested as important regulating factors of the zooplankton community

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Section: Zooplankton Communitysupporting

confidence: 86%

Zooplankton of an urban coastal lagoon: composition and association with environmental factors and summer fish kill

Souza¹,

Branco²,

Domingos³

et al. 2011

Zoologia (Curitiba, Impr.)

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“…In spite of its accelerated eutrophication process (Lutterbach et al 2001;Gonzalez et al 2006), RFL coliform and Enterococcus numbers appeared low. The data were not in agreement with previous studies in this area, which reported levels of total and fecal coliforms varying from 1.0 × 10 4 to 3.8 × 10 5 MPN 100 mL −1 and 0.1 × 10 to 1.6 × 10 5 MPN 100 mL −1 , respectively (Secretaria Municipal de Meio Ambiente 1998; Lutterbach et al 2001).…”

Section: Discussionmentioning

confidence: 95%

“…RFL is a highly eutrophicated ecosystem clearly affected by circulation patterns and domestic sewage inputs (Gonzalez et al 2006). The lagoon is connected to the sea by the Jardim de Alah Canal, which is frequently filled by silt and alluvial deposits.…”

Section: Discussionmentioning

confidence: 99%

“…However, in aquatic ecosystems in Brazil, few studies using this approach have been carried out (Hagler et al 1986;Araujo et al 1991;Vieira et al 2001;Gonzalez et al 2006). In such tropical environments, including the Rodrigo de Freitas Lagoon (RFL) in Rio de Janeiro, there is no information about pathogens at all.…”

Section: Introductionmentioning

confidence: 99%

“…The high content of nutrients and organic matter, together with the slow rate of water renewal, allows bacteria to proliferate (Lutterbach et al 2001). The spatial distribution of the total and cultivated heterotrophic bacteria and their relationship with the RFL trophic status were recently reported (Gonzalez et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Relationships between fecal indicators and pathogenic microorganisms in a tropical lagoon in Rio de Janeiro, Brazil

Gonzalez

Paranhos

Lutterbach

2009

Environ Monit Assess

Self Cite

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Rodrigo de Freitas Lagoon is an urban ecosystem undergoing accelerated degradation, therefore selected as a model for microbiological quality studies of tropical lagoons. The aim of this study was to evaluate the abundance and the spatial distribution of fecal pollution indicators and pathogenic microorganisms in the lagoon. The relationships between microbial groups and abiotic measurements were also determined to evaluate the influence of environmental conditions on bacterial distribution and to identify the capability of coliforms and Enterococcus to predict the occurrence of Vibrio, Staphylococcus aureus, and Salmonella. Surface water samples were collected monthly, from December 1999 to October 2000. Analyses were performed by traditional culture techniques. A uniform spatial distribution was observed for all bacterial groups. The fecal pollution indicators occurred in low abundances while potentially pathogenic microorganisms were consistently found. Therefore, our study supported the use of counts of coliforms and Enterococcus to indicate only recent fecal contamination.

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Spatiotemporal Variation of Bacterial Assemblages in a Shallow Subtropical Coastal Lagoon in Southern Brazil

Fontes

Abreu

2008

Microb Ecol

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A study on the bacterioplankton of Conceição Lagoon (27 degrees 34' S-48 degrees 27' W), Southern Brazil, was carried out in July 2005 (austral winter) and January 2006 (austral summer) to characterize the bacterial spatiotemporal distribution and to determine the heterotrophic and photoautotrophic bacterial dominance in hypoxic/oxic stratified waters. Bacterial abundance increased significantly (p < 0.05) in summer with averages of coccus cyanobacteria (CCY) ranging from 1.02 x 10(5) (winter) to 3.21 x 10(6) cells mL(-1) (summer), heterotrophic coccus/rod-shaped (HCR) cells from 7.00 x 10(4) to 3.60 x 10(6) cells mL(-1), and heterotrophic filamentous (HF) bacteria from 2.90 x 10(3) to 2.74 x 10(5) cells mL(-1). Bacterial biovolumes also increased in summer with mean biovolumes of CCY ranging from 0.38 to 1.37 microm3, HCR cells from 0.31 to 1.12 microm3, and HF from 3.32 to 11.34 microm3. Principal component analysis showed that salinity, temperature, and light were the abiotic factors that better explained the temporal variability of bacterial assemblages. Bacterial heterotrophy dominated in the lagoon, excepted by the southern and part of central sector in January 2006, when autotrophic-dominated microbial community occurred. Spatially, bacterial assemblages were influenced by nutrient gradient, oxygen, and salinity with a positive relationship between biovolumes and nutrients and a negative relationship between abundance of coccus cyanobacteria and nutrients. The stratified [corrected] area revealed a singular temporal pattern with hypoxic bottom waters in winter and oxygen-rich waters appearing in summer related with the availability of light and predominant microbes. Thus, oxygen consumption/production is likely to be regulated by the amount of light reaching the bottom, stimulating the production of oxygen by oxygenic phototrophs.

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Heterotrophic bacteria abundances in Rodrigo de Freitas Lagoon (Rio de Janeiro, Brazil)

Cited by 13 publications

References 14 publications

Zooplankton of an urban coastal lagoon: composition and association with environmental factors and summer fish kill

Zooplankton of an urban coastal lagoon: composition and association with environmental factors and summer fish kill

Relationships between fecal indicators and pathogenic microorganisms in a tropical lagoon in Rio de Janeiro, Brazil

Spatiotemporal Variation of Bacterial Assemblages in a Shallow Subtropical Coastal Lagoon in Southern Brazil

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