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Bahía Magdalena, the most important coastal lagoon in Baja California, has presented significant changes in the environment since 2014, as a result of global warming and the co-occurrence of “La Mancha” and “El Niño”. Monthly sampling was conducted from January 2015 to August 2018 (except winter 2016), with water collection for quantification of inorganic nutrients and phytoplankton in nine seasons, at two and three levels deep. Phytoplankton was fixed with lugol acetate and quantified using the Uthermöhl method. During this period, diatom blooms have been identified: Eucampia zodiacus (April-2015), Guinardia/Rhizosolenia (September-2016), Rhizosolenia setigera (August 2017), and Guinardia striata (June-2018), associated with the increase in nutrients provided by the upwelling (spring) and internal processes of the bay (summer-autumn). 27 species of toxic and harmful phytoplankton have been identified, among which the Pseudo-nitzschia delicatissima diatom, and the dinoflagellates: Dinophysis acuminata, D. fortii, Gymnodinium catenatum, Karlodinium cf. veneficum, Prorocentrum gracile and P. shikokuense, for their frequency and abundance. Those blooms produced low oxygen production in some areas of the lagoon, with no reports of deaths or other impacts in aquaculture areas. It is necessary to continue with the nutrient and phytoplankton evaluations and determine the contribution of these compounds by the port of San Carlos, the largest population (approximatly 7,000 inhabitants), to encourage the cultivation of mollusks in the region.

Palabras clave: Algal blooms; Bahía Magdalena

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