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¹ Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas

Pollution of Mexican Caribbean is mainly associated with increase of tourism infraestructure and poor wastewater treatment. Geomorphology and groundwater discharges (GWD) facilitate drag of organic matter, aletering the evironment. In order to evaluate a water quality and detec posible contributions of contamination by GWD, physicochemical parameters and bioindicators where evaluated in coastal points and cenotes, along Riviera and Costa Maya during October, February and June (2015-2016). According with the results, cenotes had higher concentrations of silicates and nitrates than coastal points. We intetify influence of GWD in Celeta Tankah and Chavez and Shambala. Isotopic values showed that enrichment of N in Akumal Bay and Tulumn (T2), come from wastewater. The presence of faecal enterococci had overshoot the maximun allowable limit for recreational waters for Costa Maya and Cenote Manatí. The dominance of 2A group of nematodes in Riviera and Costa Maya is related to eutrophic environments. According to the results, Cenote Encantado, Manatí, Akumal, Chávez, and the points of Costa Maya did not comply chemistry or bacteriologically with the standards required by ecological criteria and Mexican norms in this period of study[br]

Palabras clave: water quality; stable isotopes; Nematodes; nutrients; Mexican Caribbean

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