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The occurrence of picocyanobacteria was studied in May 1988 in the ice-covered East Greenland Current at 80' N .Within the upper 200 m of the water colun~n the number of picocyanobacteria decreased from the warm Atlantic Intermediate Water (AIW) to the cold Polar Water (PW), where they were practically absent.It is suggested that picocyanobacteria can serve as indicator organisms for the advection of warm water masses into polar regions.
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Gradinger et al. (1989) studied this question.
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