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Resumen:
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Durante la primavera del 2018, los volúmenes de plancton fluctuaron entre 0,302 y 1,358 mL.m-3, con promedio de 0,665 mL.m-3 y temperaturas superficiales del mar (TSM) entre 16,7 y 19,5 °C. El fitoplancton fue dominante en 32 % de las estaciones, identificándose 95 taxa de las cuales 50 fueron diatomeas (53 %), 40 dinoflagelados (42 %), 2 fitoflagelados N.D. (2 %), 2 silicoflagelados (2 %) y 1 cocolitofórido (1 %). Cuantitativamente, el fitoplancton alcanzó valor promedio de 509 cel.103.L-1, con un núcleo importante frente a Végueta (14 cel.105.L-1). Las diatomeas fueron el grupo dominante destacando Coscinodiscus centralis, C. perforatus, Actinocyclus sp., y entre los dinoflagelados destacaron especies cosmopolitas y responsables de Floraciones Algales Nocivas (FAN) o “mareas rojas” como Tripos furca, T. fusus y T. muelleri (antes identificado como Ceratium tripos). Protoperidinium obtusum, indicador de aguas costeras frías, estuvo presente en gran parte del área estudiada (41 %) en concentraciones muy bajas, asociado a especies de ambientes oceánicos, denotando la mezcla de ambas masas de agua.
ABSTRACT: During the spring of 2018, plankton volumes varied from 0.302 to 1.358 mL.m-3, with an average of 0.665 mL.m-3. Concurrently, sea surface temperatures (SST) ranged between 16.7 and 19.5 °C. At 32 % of the stations, phytoplankton emerged as the dominant group, comprising a total of 95 identified taxa. Among these, 50 were diatoms (53 %), 40 were dinoflagellates (42 %), 2 were phytoflagellates N.D. (2 %), 2 were silicoflagellates (2 %), and 1 was a coccolithophore (1 %). In terms of quantity, the phytoplankton reached an average value of 509 cells.103.L-1, with a significant core off Végueta (14 cells.105.L-1). Diatoms were the dominant group, with notable species such as Coscinodiscus centralis, C. perforatus, Actinocyclus sp., while among the dinoflagellates, cosmopolitan species responsible for Harmful Algal Blooms (HABs) or “red tides” stood out, such as Tripos furca, T. fusus, and T. muelleri (previously identified as Ceratium tripos). Protoperidinium obtusum an indicator of cold coastal waters, was present in a large part of the study area (41 %) in very low concentrations, associated with oceanic species, indicating the mixing of both water masses.
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