Resumen del producto

With the aim of studying the epibenthic dinoflagellate taxocoenosis, 153 quantitative samples were collected from different substrates (mainly attached green, brown and red macroalgae, also sediments, mangrove roots and floating macroalgae) at 10 sites along the western coast of the southern Gulf of California (eight sites in Bahía de La Paz from Playa El Califín (PC) to Playa El Tecolote (PT) and two sites beyond the bay) in May 2015, June 2016 and 2018, and December 2019. In total, about 23 dinoflagellate species from the genera Prorocentrum (8), Ostreopsis (3), Sinophysis (3), Amphidinium, Blixaea, Bysmatrum, Cabra, Coolia, Durinskia, Gambierdiscus, Fukuyoa and Plagiodinium (one species each) were found. The maximum cell abundance was observed at PC in June 2016: 14,440 cells g-1 of macroalgae wet weight (Padina with cyanobacteria clumps). Usually, Prorocentrum lima, P. rhathymum and P. sculptile were dominant (up to 76 %). Gambierdiscus was dominant only once (64 %; PT, December 2019). Occasionally, Ostreopsis dominated (up to 94 %; PT, December 2019). In all 13 macroalgal samples taken at PT in 2019, Gambierdiscus and Ostreopsis occurred; abundance reached 5,697 cells g-1. The same level of cell abundances in May-June and December can be explained by similar seasonal characteristics (warm and dry), particularly the moderate water temperature (21.5 - 25.0 °C) and low precipitation. Two mangrove root samples contained rare cells of P. lima, P. rhathymum and Coolia (Playa El Tesoro I). Among all sampling sites, PT can be considered a locality of maximum risk for human health, probably due to the richest subaquatic vegetation as a habitat

Palabras clave: Epibenthic dinoflagellates; Macroalgae; Bahía de La Paz; Gambierdisucs

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