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

Departamento de Biologia Marinha, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Prédio do CCS, Bloco A, sala A1-071, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Rio de Janeiro, Brazil, CEP 21944-970.
Environmental Monitoring and Assessment (Impact Factor: 1.68). 05/2009; 164(1-4):207-19. DOI: 10.1007/s10661-009-0886-9
Source: PubMed


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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    • "La asociación entre la presencia simultánea de patógenos y los indicadores, debe establecerse ya que el riesgo sanitario se determina a través de los indicadores, varios autores han intentado asociarlos con resultados diversos (Goyal et al., 1977; Moriñigo et al., 1990; Efstratiou et al., 1998; Polo et al., 1998; Lemarchand & Lebaron, 2003; Gabutti et al., 2004; Harwood et al., 2005; Gonzalez et al., 2010). En este estudio, el índice de sensibilidad de los CF a la presencia de Salmonella y Shigella calculado con el límite más estricto (240 CF/100mL), mostró valores similares a los reportados por Gabutti et al. (2004) que fueron del 60% y 75%, respectivamente . "
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    • "Background environmental levels of Enterococcus in surface water collected on tropical ecosystems are potentially much higher than under conditions studied to establish USEPA individual sample Enterococcus guidelines in Boston Harbor, MA; New York City, NY; and New Orleans, LA (Shibata et al., 2004). But, some research shows fecal bacteria specifically indicate fecal contamination of tropical surface water (Gonzalez et al., 2010; Contents lists available at ScienceDirect "
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