Spatial and temporal variations in water quality of Todos Santos Bay, northwestern Baja California, Mexico

Tanahara, Sorayda; Canino-Herrera, S. Raúl; Durazo, Reginaldo; Félix‐Bermúdez, Armando; Vivanco-Aranda, Miroslava; Morales-Estrada, Eduardo; Lugo-Ibarra, K. C.

doi:10.1016/j.marpolbul.2021.113148

Cited by 13 publications

(3 citation statements)

References 26 publications

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“…El contenido de materia orgánica y el oxígeno necesario para degradarla son determinados por el DBO, el cual es utilizado como indicador de contaminación orgánica (Vivas-Aguas & Navarrete-Ramírez, 2014). En general, los niveles de DBO encontrados fueron inferiores a los informados en otros estudios (Roth et al, 2016;Tanahara et al, 2021). Sin embargo, durante la primera campaña en Sámara, se registró un promedio de 5±9mgO2/L, lo cual podría estar relacionado con las altas concentraciones de contaminantes fecales detectadas en esa zona.…”

Section: Discussionunclassified

Calidad fisicoquímica y microbiológica del agua costera en Nicoya, Costa Rica: comparación de tres playas con diferente impacto turístico y administración

Montiel-Mora,

Gómez-Ramirez

2023

URJ

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Introducción: El crecimiento socioeconómico ha causado presión sobre los ecosistemas marinos, y existe poca información que pueda ser utilizada para el manejo de playas en Nicoya, Costa Rica. Objetivo: Determinar la calidad fisicoquímica y microbiológica del agua marino-costera en Nicoya, Costa Rica. Métodos: En octubre de 2021, y mayo y junio de 2022, usamos métodos estándar para evaluar las condiciones fisicoquímicas y microbiológicas del agua, en tres playas con diferentes administraciones y número de turistas. Resultados: La temperatura del agua osciló entre 26,1°C y 31,2°C, la salinidad entre 22 y 31ups, el oxígeno disuelto entre 3,6 y 7,3mg/L y los valores de hidrocarburos totales suspendidos estuvieron por debajo del límite de detección. La mayor contaminación fecal se encontró en época de lluvias, con valores máximos de 3,5x103 NMP/100mL coliformes fecales, 1,1x103 NMP/100mL Escherichia coli y 2,4x103 NMP/100mL Enteroccocus faecalis. Conclusión: Si bien la contaminación fecal fue alta durante la época de lluvias, los parámetros fisicoquímicos fueron aceptables en las tres playas.

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Section: Discussionunclassified

Calidad fisicoquímica y microbiológica del agua costera en Nicoya, Costa Rica: comparación de tres playas con diferente impacto turístico y administración

Montiel-Mora,

Gómez-Ramirez

2023

URJ

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“…These can be carried to the surface during upwelling events and affect the interior of the bay by fertilizing surface waters and promoting phytoplankton blooms (García-Mendoza et al 2009). The bay is also influenced by wastewater discharges (domestic and industrial) and agricultural runoff (Tanahara et al 2021). Its economy depends primarily on maritime trade and tourism.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the taxonomic composition of phytoplankton using microscopy and CHEMTAX in Todos Santos Bay (Baja California, México) during 2017-2018

Ramírez-Altamirano¹,

González-Silvera²,

López-Calderón³

et al. 2023

Lat. Am. J. Aquat. Res.

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This study analyzes the spatial and temporal variability of phytoplankton biomass and taxonomic composition in the surface waters of Todos Santos Bay, a semi-enclosed bay within the upwelling zone of the Baja California peninsula (México). Two methodological approaches (microscopy and chemotaxonomy [CHEMTAX]) were used to describe the variability of some genera and species (observed under the microscope) and the importance of those groups that cannot be observed microscopically. Phytoplankton biomarker pigments were measured with high-resolution liquid chromatography and used as input to run the CHEMTAX software to determine the contribution of the main phytoplankton groups to chlorophyll-a (Chl-a). The microscopic analyses showed that diatoms and dinoflagellates comprised 65 and 33% of the total cells, respectively. Dinoflagellates were most abundant in the inner bay and during cold months; the most frequent and abundant genera were Tripos, Protoperidinium, and Prorocentrum. Among diatoms, the most frequent genera were Cylindrotheca, Guinardia, Navicula, Pseudo-nitzschia, and Chaetoceros. CHEMTAX indicated that, together with diatoms, the flagellates prymnesiophytes and chlorophytes contributed a median of 80% to Chl-a, with chlorophytes as the most important group (29.9%). The high contribution of these flagellates suggests that they are represented by small-sized cells not visible by the light microscopy used. However, CHEMTAX largely underestimated the contribution of dinoflagellates (due to the presence of many mixotrophic species). Hence, our results emphasize the importance of using both techniques for a more detailed evaluation of the taxonomic composition of phytoplankton in this and other coastal regions.

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“…Most coliform bacteria are harmless to humans, but others can cause severe waterborne diseases [4]. The presence of coliform is an issue in coastal areas due to human activities' uncontrolled disposal of wastewater and pollutants on the coast [5].…”

Section: Introductionmentioning

confidence: 99%

Concentration of fecal coliforms in marine waters using satellite images in the vicinity of Pucusana. Bay, Peru.

Palma-Gongora

Zuta-Medina

Gomez-Cunya

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Water quality monitoring in coastal areas is challenging due to cost and time constraints. Identifying and selecting sampling sites accurately and effectively is crucial for efficient monitoring. The need for efficient monitoring of marine waters has led to exploring the use of remote sensing as one helpful alternative. Remote sensing is practical in several applications based on pattern recognition and information processing of large terrestrial and aquatic surface areas. Collected information is processed with various image processing techniques to identify objects such as microorganisms. Fecal coliforms are microorganisms that are indicators of sanitary quality and are present in human and animal wastes discharged into water bodies reaching coastal regions. The present study estimated the presence of fecal coliforms as an indicator of contamination in coastal marine waters. Satellite data from two sensors, Landsat 7 ETM+ and Landsat 8 OLI, were used to evaluate the reflectance of fecal coliforms in marine waters. Then, statistical analysis and four regression models were tested to establish a functional correlation between the spectral bands and historical in situ fecal coliform measurement. In this research, satellite imagery in the vicinity of Pucusana Bay helped estimate the concentration of fecal coliforms in marine waters. As a result, a significant relationship was found between the shortwave infrared band splitting (SWIR 2) with the blue band and fecal coliforms presence. The relationship was used to estimate coliform concentration from the reflectance of the aquatic surface in Pucusana Bay. Finally, spatial distribution maps of fecal coliform concentrations were generated to compare the increase of these microorganisms over different years in the area. The methodology and results can be calibrated to other water body locations where fecal coliform is a concern.

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Spatial and temporal variations in water quality of Todos Santos Bay, northwestern Baja California, Mexico

Cited by 13 publications

References 26 publications

Calidad fisicoquímica y microbiológica del agua costera en Nicoya, Costa Rica: comparación de tres playas con diferente impacto turístico y administración

Calidad fisicoquímica y microbiológica del agua costera en Nicoya, Costa Rica: comparación de tres playas con diferente impacto turístico y administración

Evaluation of the taxonomic composition of phytoplankton using microscopy and CHEMTAX in Todos Santos Bay (Baja California, México) during 2017-2018

Concentration of fecal coliforms in marine waters using satellite images in the vicinity of Pucusana. Bay, Peru.

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