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Rio de Janeiro, Brazil

Menezes M.,Federal University of Rio de Janeiro | Branco S.,Federal University of Rio de Janeiro | Guimaraes R.R.,Federal University of Rio de Janeiro | de Sousa V.L.M.,Federal University of Rio de Janeiro | And 4 more authors.
Oecologia Australis | Year: 2012

The floristic composition and the spatio-temporal distribution of cyanobacteria and microalgae were studied in the Piraquê Channel, which enters the northeastern part of the Rodrigo de Freitas Lagoon, city of Rio de Janeiro. The study was based on 30 qualitative and quantitative samples collected in March, April, June, July, October, November, December 2007 and January, February and March 2008 at the subsurface, in the middle of the channel. A comparison between floristic composition in the lagoon and channel was also assessed. Altogether, 86 taxa were found (68 new records for the Rodrigo de Freitas Lagoon) mainly distributed in diatoms (39), chlorophytes (19) and cyanobacteria (13). Nitzschia and Desmodesmus had the largest number of species. Pseudanabaena catenata, Synechocystis salina, Heterocapsa pygmaea and Thalassiosira weissflogii were the most frequent taxa, occurring in 70% of the samples. Limnobiont species (44%) predominated, while euryhaline marine and limnobiont taxa occurred in similar proportions (20% each), and true brackish-water species were fewer (16%). When the different compartments of the lagoon were compared, the channel was characterized by a predominance of Pseudanabaena spp. throughout the study period, while in the main body of the lagoon Pseudanabaena spp. and Synechocystis salina were the most abundant species during the dry and rainy periods, respectively. In contrast, Heterosigma akashiwo, Cyclotella chocktawhatcheeana, Monoraphidium contortum and Monoraphidium irregulare occurred only in the channel. Differences in the spatio-temporal distribution of microalgae between the two compartments were probably due to the occurrence of specific bloom events formed by the typical species of the channel. Populations of microalgae in the main body of the lagoon showed a less variable temporal distribution, throughout most of the study period. Source


Montezzi L.F.,Federal University of Rio de Janeiro | Campana E.H.,Federal University of Rio de Janeiro | Correa L.L.,Federal University of Rio de Janeiro | Justo L.H.,Federal University of Rio de Janeiro | And 5 more authors.
International Journal of Antimicrobial Agents | Year: 2015

The spread of carbapenemase-producing Gram-negative rods is an emerging global problem. Although most infections due to carbapenemase producers are limited to healthcare institutions, reports of the occurrence of clinically relevant carbapenemase producers in sewage and polluted rivers are increasingly frequent. Polluted rivers flowing to oceans may contaminate coastal waters with multidrug-resistant bacteria, potentially threatening the safety of recreational activities in these locations. Here we assessed the occurrence of carbapenemase producers in water from touristic beaches located in Rio de Janeiro, Brazil, showing distinct pollution patterns. The presence of enterobacteria was noted, including the predominantly environmental genus Kluyvera spp., producing either Klebsiella pneumoniae carbapenemase (KPC) or Guyana extended-spectrum (GES)-type carbapenemases and often associated with quinolone resistance determinants. An Aeromonas sp. harbouring blaKPC and qnrS was also observed. These findings strengthen the role of aquatic matrices as reservoirs and vectors of clinically relevant antimicrobial-resistant bacteria, with potential to favour the spread of these resistance threats throughout the community. © 2014 Elsevier B.V. and the International Society of Chemotherapy. All rights reserved. Source


Domingos P.,LABALGAS DBV IBRAG UERJ | Gomara G.A.,Gelab Gerencia Do Complexo Of Laboratorios | Sampaio G.F.,Instituto Estadual do Ambiente INEA | Soares M.F.,Instituto Estadual do Ambiente INEA | Soares F.F.L.,Instituto Estadual do Ambiente INEA
Oecologia Australis | Year: 2012

The Rodrigo de Freitas Lagoon (area 2.2km2, mean depth 2.8m) has a Basin of 32km2 and is formed by the rivers Cabeças, dos Macacos and Rainha, which drain areas of Tropical Rain Forest (Mata Atlântica) and urban occupation located in a high density area in the city of Rio de Janeiro. Isolated of the sea for beaches of Ipanema and Leblon, it reflects old problems of sanitation and is in eutrophic state. In consequence, periodic fish kill are registered. The Environmental State Institute (INEA) has been monitoring the phytoplankton community weekly and the abiotic variables twice a week in the entire water column. This periodic monitoring (02/2000 to 12/2010) has searched to supply the measures that allow one better management of this environment. For in such a way one has used the data of the community of phytoplankton as describing biological, beyond the abiotics parameters that had been associates to the fish kill events. Phytoplankton (0.1 × 104 ind.mL-1 to 186 × 104 ind.mL-1) was almost always dominated by Cyanobacteria. The mortality instances shows two response standards regarding phytoplankton structure: one related to rainfall (Pseudoanabaena limnetica was replaced by Prorocentrum cordatum (ex-minimum) dominance), and the other to lack of rain (Synechocystis aquatilis dominance). The set of these data infsidized the implantation of a system of alert, of preliminary form, since January of 2003. The considered system of alert is applied weekly and contributes for of predictability of mortality events and for interventions on the ecosystem. Source


Soares M.F.,Instituto Estadual do Ambiente INEA | Domingos P.,LABALGAS DBV IBRAG UERJ | Soares F.F.L.,Instituto Estadual do Ambiente INEA | Telles L.F.R.,Instituto Estadual do Ambiente INEA
Oecologia Australis | Year: 2012

Environmental monitoring is an indispensable tool to provide the authorities with a value judgment about environmental quality in ecosystems, seeking to use it also to identify the factors and processes that contribute to their degradation agents. This report presents a diagnosis of sanitary conditions and food webs at the Rodrigo de Freitas lagoon waters for the period from 2000 to 2010, from its systematic monitoring and includes observations from the channels Jardim de Alah and Piraquê. The results for that period represent around 10 years of monitoring in four sampling points. There were also two additional points in the adjacent channels since January 2005, which add up to the results of the measurements of vertical profiles (biweekly) for dissolved oxygen parameters (OD), salinity, temperature and Secchi transparency. The results of weekly collections of samples for analysis of physico-chemical parameters in addition to bacteriological and phytoplankton community were also included. The parameters analyzed have been shown to be good indicators of water quality, allowing to the evaluation of the conditions of the aquatic ecosystem and helping in the establishment of the trophic state of the ecosystem, the intensity of the incoming sea water, the phytoplankton succession populations, as well as the activity of production/consumption of oxygen along the water column (refers to the vertical depth - mass - the body of water). This information aims to provide greater understanding of the lagoon, from the fundamental dynamic processes that can contribute to decision-making and increase the possibility of predicting accidents with the ichthyofauna. Source


Montezzi L.F.,Federal University of Rio de Janeiro | Campana E.H.,Federal University of Rio de Janeiro | Correa L.L.,Federal University of Rio de Janeiro | Justo L.H.,Federal University of Rio de Janeiro | And 5 more authors.
International Journal of Antimicrobial Agents | Year: 2014

The spread of carbapenemase-producing Gram-negative rods is an emerging global problem. Although most infections due to carbapenemase producers are limited to healthcare institutions, reports of the occurrence of clinically relevant carbapenemase producers in sewage and polluted rivers are increasingly frequent. Polluted rivers flowing to oceans may contaminate coastal waters with multidrug-resistant bacteria, potentially threatening the safety of recreational activities in these locations. Here we assessed the occurrence of carbapenemase producers in water from touristic beaches located in Rio de Janeiro, Brazil, showing distinct pollution patterns. The presence of enterobacteria was noted, including the predominantly environmental genus Kluyvera spp., producing either Klebsiella pneumoniae carbapenemase (KPC) or Guyana extended-spectrum (GES)-type carbapenemases and often associated with quinolone resistance determinants. An Aeromonas sp. harbouring bla KPC and qnrS was also observed. These findings strengthen the role of aquatic matrices as reservoirs and vectors of clinically relevant antimicrobial-resistant bacteria, with potential to favour the spread of these resistance threats throughout the community. © 2014 Elsevier B.V. and the International Society of Chemotherapy. Source

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