Resumen del producto

On 19–20 August 2014, a moderate proliferation of dinoflagellates was detected in the southwestern part of Bahía de La Paz. The phytoplankton community within this red tide was composed of 60 microalgae taxa and was characterized by the presence of unarmored dinoflagellates such as Levanderina fissa and Polykrikos hartmannii. The proliferation occurred during low tide after a period of windy and rainy days. Densities of L. fissa varied from 163 to 265 × 10³ cells L–1 and for P. hartmannii varied from 16 to 33 × 10³ cells L–1. Low densities were estimated on September and October samplings. Both species showed a great variation both in size and form. As part of the phytoplankton species composition during this proliferation, two taxa of dinoflagellates are new records for the Pacific coast of Mexico (Ankistrodinium semilunatum and Sclerodinium calyptroglyphe), one in the Gulf of California (Pronoctiluca acuta), and one in the Bahía de La Paz (Prorocentrum robustum). Cyanobacteria were an important group observed during this proliferation. The symbiotic association between a cyanobacterium Synechococcus sp., the stramenopile protist Solenicola setigera, and the diatom Leptocylindrus mediterraneus was observed for the first time in this bay.

Palabras clave: New records; Dinoflagellate proliferation; Levanderina fissa; Polykrikos hartmannii; consortium Solenicola Leptocylindrus Synechococcus; picoplankton

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