The ice algal and phytoplankton assemblages were studied from Nella Fjord rnnear Zhongshan Station, East Antarctica from April 12 to December 30, 1992. Algal rnblooms occurred about 3 cm thick on the bottom of sea ice in late April and mid rnNovember to early December respectively, and a phytoplankton bloom appeared in the rnunderlying surface water in mid December following the spring ice algal bloom. The rnbiomass in ice bottom was 1 to 3 orders of magnitude higher than that of surface water.rnAmphiprora kjellmanii, Berkeleya sp., Navicula glaciei, Nitzschia barkelyi, N.rncylindrus /N. curta, N. lecointei and Nitzschia sp. were common in the sea ice rntemporarily or throughout the study period. The biomass in a certain ice segment was rndecreased gradually and the dominant species were usually succeeded as the season went rnon. Nitzschia sublineata and Dactyliosolen antarctica were two seasonal dominant species rnonly observed in underlying water column. The assemblages between bottom of ice and rnunderlying surface water were different except when spring ice algae bloomed. The rnevidence shows that the ice algal blooms occurred mainly by in situ growth of ice algae,rnand the phytoplankton bloom was mostly caused by the release of ice algae.
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