Abstract
The day-to-day variations over a 17-day period in the plankton community of a shallow embayment located in the Basque Country (Bay of Biscay) were studied and related to changing environmental conditions. Fluctuations in river runoff due to several rain pulses determined most of the changes in the chemical properties of the embayment. Other physical forcing functions like wave originated high turbulence in the water column, regulating the quantity and quality of seston and chlorophyll a. As a response to the combined effects of these processes, different patterns of variation were observed in phyto- and zooplankton populations. Skeletonema costatum developed after nutrient inputs into the system and resulted in enhanced primary production levels. Population growth was also controlled by turbulence, while the disappearance of this pulse could be associated with the depletion of silicate. Zooplankton abundance fluctuations can be explained mainly by their motility to avoid the environmental stress imposed by water turbulence and sediment resuspension.
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