Abstract

HOYOS ACUNA, Jesús Javier; QUINTANA MANOTAS, Humberto Luis; BERMUDEZ RIVAS, Christian  and  CASTRILLON VALENCIA, Fredy Albeiro. First record of the genus Metadinophysis Nie y Wang (Dinophyceae: Dinophysales) in coastal areas of the Colombian Pacific. Biota colombiana [online]. 2023, vol.24, n.1, e1101.  Epub Mar 08, 2023. ISSN 0124-5376.  https://doi.org/10.21068/2539200x.1101.

The dinoflagellate genus Metadinophysis (Dinophyceae Dinophysales) is recorded for the first time in the Buenaventura Bay and Uramba National Natural Park-PNN Uramba in Málaga Bay in the central Colombian Pacific and its density is analyzed with tidal changes. Cells were recorded with subtriangular and reniform outline in ventral view and small epitheca. Left sulcal fin with three ribs and the right one very reduced or absent, presenting average size 43.1 μm total length and 25.0 μm total width, the density of the genus was analyzed under four factors, high tide and low tide in Buenaventura Bay and in Málaga Bay; significant differences were found between the density at high tide and low tide for Buenaventura Bay, the difference between high tide in Malaga Bay and low tide in Buenaventura Bay. Likewise, it was established that the density distribution has no spatial structure in any of the tidal events. With the present study, the genus Metadinophysis is recorded for the first time in the Colombian Pacific, extending its distribution globally.

Keywords : Density; Phytoplankton; Dinoflagellates; Pacific Ocean; First record.

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