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Biomass and grazing activity of sea ice microorganisms smaller than 20 pm were studied at Resolute Passage in the Canadian Arctic during the algal bloom in spring 1992. The spatial variation in biornass beneath a 225 m2 area with changing snow cover was almost as great as the temporal change (under a constant snow cover) over the 5 wk sampling period. Cell density in the ice varied from 57 X 107 to 2.6 X 10' cells m-' Total bacterivory of the protozoan community was assessed by measuring the disappearance of fluorescently labelled bacteria over 20 h. Feeding rates by heterotrophic nanoprotozoans (HNAN) were high at the beginning of the sampling period (late April) but decreased to very low values by the end of May; HNAN clearance rates ranged from 53 to 86 nl HNAN-' h' (mean = 12 nl HNAN-I h-') while ingestion rates ranged from 53 to 64 bacteria HNAN-' h' The carbon budget analysis indicates that bacteria alone could not provide the required energy for the observed protozoan growth. The results suggest that a shift in the grazing behavior of HNAN occurred during the bloom season, modifying the microbial food web dynamics.

marine ecology. progress series

The microbial food web associated with the ice algal assemblage:biomass and bacterivory of nanoflagellate protozoans in Resolute Passage (High Canadian Arctic)