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Vertical migration of two dinoflagellate species (Peridiniellacatenata and Scrippsiella hangoei) and a phototrophic ciliate(Mesodinium
rubrum) were studied during the peak and decline of avernal bloom at the SW coast of Finland. During the diel cycle, part
of thepopulations of P. catenata and M. rubrum wereobserved in the deeper layers with elevated nutrient concentrations, whileS.
hangoei remained in the upper nutrient depleted mixed layer.Using a correspondence analysis the vertical distribution patterns
of thespecies and chlorophyll a were examined over a temporal scale of hoursand weeks. The vertical migration was reflected
in much higher variabilityin the depth distribution of P. catenata and M. rubrum over a diel scale, compared to S. hangoei.
The analysisrevealed also significant differences in species specific depth distributionpatterns over both time scales. It
is discussed that the co-existence of thetwo dominant dinoflagellate species during the vernal bloom is due to nicheseparation
through behavioural adaptations.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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