The growth season of Dinophysis acuminata in an upwelling system embayment. A conceptual model based on in situ measurements
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AuthorsVelo-Suárez, L. (Lourdes); Reguera, B. (Beatriz); González-Gil, S. (Sonsoles); Pazos, Y. (Yolanda)
Harmful algae blooms
The distribution and physiological condition of the DSP-toxin producerDinophysis acuminata, its relation with accompanying microplankton populations and coupling with upwelling events are described based on weekly sampling at afixed station in Ría de Pontevedra, Galician Rías Baixas, NW Spain between March and December 2007.D. acuminatawas detected from 18 June to 01 October. The appearance of D. acuminatain the Ría coincided with an upwelling-relaxation event and a short-lived maximum (up to 27 000 cells L −1 ) of its potential prey, the phototrophic ciliateMesodiniumcfrubrum. An increase in the proportion of vacuolatedDinophysiscells (72%) observed one week later suggests that the bloom was triggered by heterotrophic feeding on a co-occurring peak of Mesodiniumcoupled with advection of Dinophysiscells into the ría. Elevated frequencies of cells with starch and vacuoles were closely associated with the presence ofM.cfrubrum during the entire bloom season. However, peaks in ...