Bacteriological water quality along the Tijuana–Ensenada, Baja California, México shoreline

Orozco-Borbón, M.V.; Rico-Mora, Roxana; Weisberg, Stephen B.; Noble, Rachel T.; Dorsey, John H.; Leecaster, Molly; McGee, Charles D.

doi:10.1016/j.marpolbul.2006.02.005

Cited by 18 publications

(16 citation statements)

References 11 publications

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“…Studies conducted in the Southern California Bight [11] [13]- [16] and in northwestern Baja California [17] [18] have found that runoff can influence the microbiological quality of seawater. In our study, the highest concentrations of indicator bacteria were found at Stations 1 (Playa California), 2 (Arroyo Ensenada), and 3 (Playa Municipal), clearly influenced by stormwater runoff; however, note that stations 1 and 3 are located, close to the discharges from the El Sauzal and Naranjo-El Gallo treatment plants (inland, Figure 1) in which other studies did not find differences between winter and summer conditions due to scant rainfall [6]. The winter salinity measurements indicate freshwater input at Stations 3 (22.59), 6 (26.91), 2 (30.27), and 1 (31.77) (Figure 3(a)), and there were high negative correlation coefficients (0.924, 0.932 and 0.897) between CT, CF and Enterococci respectively and salinity, except at Station 3, which showed a negative correlation only with FC.…”

Section: Discussioncontrasting

confidence: 56%

“…Enterococci were enumerated by membrane filtration on mE1 agar according to method 1600 [9], before being incubated at 41˚C for 24 hours. The Total/fecal ratio was the fourth bacterial indicator [6]. Data were compared (Table 1) to the Single Sample Standard (SSS) and the 30-Day Sample Standard (30-DSS) established in the California Ocean Plan [10].…”

Section: Methodsmentioning

confidence: 99%

“…The microbiological studies of Todos Santos Bay have shown that some of the beaches regularly used by the population, including the main municipal beach, are being influenced by wastewater discharges. Concentrations of coliform bacteria and enterococci exceeding the limits established for primary contact recreation waters have been detected at these beaches [5] [6]. Simental-Oceguera and Martínez-Hurtaza [7] found bacterial indicators of pollution and identified 20 Salmonella serotypes in residual waters (16.2%) and seawater (2.3%).…”

Section: Introductionmentioning

confidence: 99%

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Winter and Summer Evaluation of Bacteriological Water Quality at Recreational Beaches along Todos Santos Bay, Baja California, Mexico

Orozco-Borbón¹,

Gutiérrez-Galindo²,

Navarro-Olache³

et al. 2014

AiM

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Water bacteriological qualities of 22 recreational beaches in Ensenada Bay, Baja California, Mexico were analyzed during the summer and winter of 2008. Total and fecal coliforms as well as enterococci bacteria were used as pollution indicators. Results showed that bacteria concentrations were higher in winter than summer, associated with Southern California rainy season. Bacteria loads in winter exceeded both the daily and monthly standards showing a clear effect of storm water runoff in the quality of Todos Santos Bay recreational beaches. Statistical analysis showed significant differences between bacteria concentration during summer and winter. The general behavior of the indicators based on daily and monthly standards from high to low was enterococci > FC > TC> total/fecal ratio. Water discharged from 3 sewage treatment plants were responsible for the pollution observed at stations, when the uptake capacity of plants exceeded the storage. During summer pollution was due to non-programmed discharges from sewage treatment plants.

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Section: Discussioncontrasting

confidence: 56%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Winter and Summer Evaluation of Bacteriological Water Quality at Recreational Beaches along Todos Santos Bay, Baja California, Mexico

Orozco-Borbón¹,

Gutiérrez-Galindo²,

Navarro-Olache³

et al. 2014

AiM

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“…Their result is consistent with the present classification of the areas as being conditionally approved for shellfish harvest. Orozco-Borbón et al (2006) reported that TCs and FCs were highly correlated during summer and winter. The high correlation between TC and FC indicators during both sampling periods is because FCs are a sub-group of TCs (Noble et al, 2000).…”

Section: Spatial Distribution Of Fc Concentrations In Seawatermentioning

confidence: 99%

Bacteriological quality evaluation of seawater and oysters from the Jaranman-Saryangdo area, a designated shellfish growing area in Korea: Impact of inland pollution sources

Mok

Lee

Kim

et al. 2016

Marine Pollution Bulletin

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“…Por otra parte, en el área de estudio en la CNBC sólo se localiza una planta municipal de tratamiento de aguas residuales domésticas, en Tijuana, cuyas emisiones son descargadas al mar, pero no cuenta con mediciones de descarga de Hg. Históricamente las plantas de tratamiento de aguas residuales domésticas del sur de California, y de Baja California, han sido consideradas como una fuente primaria de contaminantes a la zona costera (Steinberg y Stein 2004, Orozco-Borbón et al 2006. Por ello es posible que los aportes de Hg por estas descargas domésti-cas, además de los provenientes del flujo atmosférico, sean detectados en forma de un gradiente norte-sur de concentraciones de este elemento en los sedimentos marinos superficiales de la CNBC.…”

Section: Introductionunclassified

Spatial distribution and enrichment of mercury in surface sediments off the northwest coast of Baja California, Mexico

Gutiérrez-Galindo¹,

Casas-Beltrán²,

Muñoz-Barbosa³

et al. 2007

Cienc. Mar.

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IntroducciónEl conocimiento de la distribución de los metales traza en los sedimentos marinos es importante debido a que éstos son sumideros de sustancias de origen natural y antropogénicas, mismas que se preservan en las partículas de los sedimentos o son recicladas hacia la columna de agua (Fergusson 1990). Uno de los metales más tóxicos para la biosfera es el Hg (Lacerda y Solomons 1998), el cual tiene una gran afinidad con la fase particulada (Hurley et al. 1994) y, en sedimentos costeros contaminados, su concentración comúnmente evidencia la evolución histórica de la contaminación con este metal (Gobeil y Cossa 1993). Por lo tanto, la información en este contexto es importante para identificar el riesgo potencial de contaminación y toxicidad de Hg para el medio marino y los seres humanos (Besada et al. 2006, Cecilio et al. 2006. IntroductionKnowledge of trace metal distribution in marine sediments is important since they act as sinks for substances of natural and anthropogenic origin, which are preserved in sedimentary particles and recycled into the water column (Fergusson 1990). Mercury, one of the most toxic metals to the biosphere (Lacerda and Solomons 1998), has a great affinity to the particulate phase (Hurley et al. 1994). In contaminated coastal sediments, its concentration is an indication of the historical evolution of Hg pollution (Gobeil and Cossa 1993). Information in this context is therefore relevant to identify the potential risk of Hg contamination and toxicity in the marine environment and humans (Besada et al. 2006, Cecilio et al. 2006 ResumenSe estudió la distribución y el enriquecimiento de Hg en sedimento superficial recolectado en agosto de 1998 de 37 estaciones a lo largo de la costa noroccidental de Baja California (CNBC). Para el análisis de Hg se utilizó la técnica de vapor frío en un espectrofotómetro de absorción atómica. Se midieron también los porcentajes de lodos (<63 μm) y de materia orgánica. Las concentraciones de Hg mostraron una distribución espacial homogénea en la zona de estudio. La concentración media de Hg (58.2 ng g -1 ) fue similar a la encontrada en la Cuenca del Sur de California. Se observaron enriquecimientos de Hg en cuatro estaciones localizadas en la zona norte y centro de la zona de estudio. En general, las concentraciones de Hg (30.4-96.5 ng g -1 ) mostraron niveles relativamente bajos que no presentan riesgo al ambiente de acuerdo con las guías de calidad de sedimento marino de Norteamérica. La ausencia de correlación entre el Hg y los lodos y la materia orgánica sugiere que estas variables no influyen en la concentración y la distribución espacial de Hg en los sedimentos de la CNBC.Palabras clave: Baja California, contaminación, sedimentos marinos, mercurio. AbstractAn evaluation was made of the distribution and enrichment of Hg in surface sediments collected in August 1998 at 37 stations along the northwest coast of Baja California (NCBC). Mercury was analyzed by cold-vapour atomic absorption spectrophotometry. The percentages of mud (<63 μm) and orga...

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Bacteriological water quality along the Tijuana–Ensenada, Baja California, México shoreline

Cited by 18 publications

References 11 publications

Winter and Summer Evaluation of Bacteriological Water Quality at Recreational Beaches along Todos Santos Bay, Baja California, Mexico

Winter and Summer Evaluation of Bacteriological Water Quality at Recreational Beaches along Todos Santos Bay, Baja California, Mexico

Bacteriological quality evaluation of seawater and oysters from the Jaranman-Saryangdo area, a designated shellfish growing area in Korea: Impact of inland pollution sources

Spatial distribution and enrichment of mercury in surface sediments off the northwest coast of Baja California, Mexico

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