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The Spring Phytoplankton Bloom takes place in the Central Cantabrian Sea (Southern Bay ofBiscay) from late-winter to spring as a series of blooms with variable biomass accumulation. Inlate-winter of 2004 and 2005, phytoplankton blooms occurred in this area following a change inthe weather. In order to describe the dynamics of these late-winter blooms, two oceanographiccruises which involved high-frequency sampling (every 2–3 days) were carried out. Meteorologicalconditions during the cruises showed similar changes in variables relevant to phytoplankton physiologyand population dynamics. Before the bloom, phytoplankton started to grow actively whenunderwater photosynthetic active radiation (PAR) increased. However, biomass accumulation didnot occur until wind, and hence turbulence levels in the water column, decreased. The observationspresented here suggest that before the onset of a late-winter bloom a preliminary physiological activationphase is necessary driven by increased availability of underwater PAR. Afterwards, biomassaccumulation can take place provided wind-derived water column turbulence decays. The developmentof the bloom is reinforced by the shoaling of the surface mixing layer depth. The timing ofthis sequence of events can be altered by meteorological disturbances, such as an increase of windspeed. The composition of the bloom differed across-shelf: phytoplankton larger than 5 mm inequivalent spherical diameter (ESD) dominated on the coast and inner shelf, whereas smallerphytoplankton (,5 mm ESD) were more important in the oceanic area, markedly when a frontalstructure separating both domains developed at the mid-shelf.En prensa1,749

Short-term dynamics of late-winter phytoplankton blooms in a temperate ecosystem (Central Cantabrian Sea, Southern Bay of Biscay)