Resumen del producto

Santa Rosalía is located to the northeast of the Baja California Sur, were a copper ore mine was exploited. Mining activities were closed in 1984 and returned in 2014. The wastes were dumped into the Gulf of California, but eventually were brought back by currents to the beaches of this town. The objective of this study was to determine the concentration values of potentially toxic elements (PTE) in beaches and harbor of Santa Rosalía in 2016, and to evaluate if these have varied with respect to previous studies, and to analyze the assemblages of benthic diatoms. Results show concentrations (mg kg-1) that exceed the reference values for the earth's crust for Cu (3193), Zn (2393), Co (307), Pb (191), Cd (42) U (40). The contents of the 2016 samples are equally concentrated than in previous studies, despite the reactivation of mining activities. Those contents exceed the mid-range effect (MRE) of sediments toxicity which would be harmful to organisms in the area. Species richness of live benthic diatoms appeared normal, and although they show deformities, these are not significant. It cannot be concluded if the mining wastes are unfavorable to the adjacent biota.

Palabras clave: Marine sediment; Metals; contamination; Diatoms

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