https://rinacional.tecnm.mx/jspui/handle/TecNM/14143 2026-10-22T09:59:38Z 2026-10-22T09:59:38Z Núñez-Vázquez, Erick Poot Delgado, Carlos Antonio https://rinacional.tecnm.mx/jspui/handle/TecNM/14245 2026-10-22T00:18:07Z 2022-11-22T00:00:00Z

Title: Paralytic Shellfish Toxins of Pyrodinium bahamense (Dinophyceae) in the Southeastern Gulf of Mexico Authors: Núñez-Vázquez, Erick; Poot Delgado, Carlos Antonio Description: In September and November 2016, eight marine sampling sites along the coast of the southeastern Gulf of Mexico were monitored for the presence of lipophilic and hydrophilic toxins. Water temperature, salinity, hydrogen potential, dissolved oxygen saturation, inorganic and phytoplankton abundance were also determined. Two samples filtered through glass fiber filters were used for the extraction and analysis of paralytic shellfish toxins (PSTs) by lateral flow immunochromatography (IFL), HPLC with post-column oxidation and fluorescent detection (FLD) and UHPLC coupled to tandem mass spectrometry (UHPLC-MS/MS). Elevated nutrient contents were associated with the sites of rainwater discharge or those near anthropogenic activities. A predominance of the dinoflagellate Pyrodinium bahamense was found with abundances of up to 104 cells L􀀀1. Identification of the dinoflagellate was corroborated by light and scanning electron microscopy. Samples for toxins were positive by IFL, and the analogs NeoSTX and STX were identified and quantified by HPLC-FLD and UHPLC-MS/MS, with a total PST concentration of 6.5 pg cell􀀀1. This study is the first report that confirms the presence of PSTs in P. bahamense in Mexican waters of the Gulf of Mexico.

2022-11-22T00:00:00Z Gómez Figueroa, Alfredo Rendon von Osten, Jaime Poot Delgado, Carlos Antonio Okolodkov, Yuri https://rinacional.tecnm.mx/jspui/handle/TecNM/14244 2026-10-22T00:13:12Z 2023-05-09T00:00:00Z

Title: Seasonal Response of Major Phytoplankton Groups to Environmental Variables along the Campeche Coast, Southern Gulf of Mexico Authors: Gómez Figueroa, Alfredo; Rendon von Osten, Jaime; Poot Delgado, Carlos Antonio; Okolodkov, Yuri Description: To describe the seasonal response of the major phytoplankton groups to environmental variables along the Campeche coast, southeastern Gulf of Mexico, seven shallow-water (ca. 1 m) stations were monitored from January 2019 to January 2020. Orthophosphate, ammonium, nitrite, nitrate and silicate were measured. Several tests, including ANOVA, the Kolmogorov–Smirnov test, Tukey TSD, Bartlett’s test and canonical correspondence analysis (CCA), were applied. The physicochemical variables (temperature, salinity and pH) recorded are typical for the central coast of Campeche. Seasonal characteristics are affected by the shallowness of the study area. The variation of inorganic nutrient concentrations is likely to be related to specific polluting activities. While the abundance of phytoplankton presented a minimum value of 4.1 104 cells L􀀀1 in March, the maximum value of 8.8 106 L􀀀1 cells occurred in May; the general average was 5.3 105 cells L􀀀1. Based on CCA, the correlation between major phytoplankton groups and physical–chemical variables was high (r 0.8), indicating a significant relationship. The CCA graphs separated the samples of diatoms by higher values of pH and silicate and separated the samples of cyanobacteria with high values of temperature (>30 C) from the samples with dinoflagellates and nanoflagellates. Nanoflagellates were abundant in the samples with high values of ammonium and phosphate.

2023-05-09T00:00:00Z Hernández Morales, Shirley Poot Delgado, Carlos Antonio https://rinacional.tecnm.mx/jspui/handle/TecNM/14243 2026-10-22T00:08:27Z 2018-01-06T00:00:00Z

Title: Coliformes Totales en Malecón Turístico Authors: Hernández Morales, Shirley; Poot Delgado, Carlos Antonio Description: Debido a que el malecón con vocación turística de Champotón, Campeche cuenta con actividades productivas antrópicas en su franja, se propuso detectar la presencia y cuantificación de los coliformes totales (CT), como parámetro indicador de la calidad del agua. Para ello se seleccionaron tres días en octubre con un intervalo de 24 h y en 3 estaciones de muestreo con conocida actividad antrópica, mercado principal (E1), hospital (E2) y bodega pesquera (E3). La determinación de los CT fue de acuerdo con la norma NOM-112-SSA1-1994 que consiste en una prueba presuntiva y una confirmativa. Se detectó la presencia de CT en los tres sitios de muestreo, durante los tres días. Durante el periodo de muestreo y todos los sitios, los horarios de 7 y 12 h, estuvieron por debajo de límites máximos permitidos, que de acuerdo con los lineamientos de calidad del agua para la protección a la vida acuática en aguas costeras es de 240 NMP/100 ml. Se registraron valores máximos en el horario de 18 h en todas las estaciones, con un máximo en la E2 de 9200 NMP/100 mL.

2018-01-06T00:00:00Z Hernández Crisostomo, Cintia Poot Delgado, Carlos Antonio https://rinacional.tecnm.mx/jspui/handle/TecNM/14242 2026-10-22T00:04:56Z 2017-01-19T00:00:00Z

Title: Residuos Sólidos Generados en Malecón Turístico Authors: Hernández Crisostomo, Cintia; Poot Delgado, Carlos Antonio Description: En la presente investigación se realizó una caracterización y cuantificación de los residuos sólidos generados en el malecón con vocación turística de la ciudad de Champotón, con el objetivo de clasificarlos y cuantificarlos de acuerdo a la normatividad vigente. Se seleccionaron siete estaciones de muestreo; en cada una se ubicaron transectos perpendiculares a la línea de costa y sobre éstos se trazaron cuadrantes paralelos para la recolección de residuos sólidos, de acuerdo a la norma mexicana NMX-AA-120-SCFI-2006. Se observó que el malecón de la ciudad de Champotón no cumple con las especificaciones que contempla la norma, habiéndose encontrado más de 5 unidades de residuos sólidos en 12 m, por estación muestreada. El tipo de residuos encontrados en las siete estaciones, son las bolsas de nylon con un promedio de 41%, seguido de los envases PET (polietileno terealato), con un 31%. En menor porcentaje se registraron algunos residuos comunes inherentes a la actividad pesquera ribereña que impera en la zona.

2017-01-19T00:00:00Z