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Abstract

Low concentrations of phytoplankton (average 2.5 x 104 to б.0 х 105 cells l-1) were found at ten stations surveyed in the region of the Weddell-Scotia Confluence. Phytoflagellates represented mainly by 1—3 μm picoplankton were prevalent among the algae, contributing 65—100% to the total numbers: this group is observed to dominate over diatoms in areas of intensive water mixing. Maximum concentrations of phytoplankton at one station, reaching down to 200 m, were due to a physical aggregation of cells by confluencing and downwelling waters. The average for the water column quantities of the same algal groups were nearly identical at most stations, but peak numbers occurred in the 0—75 m surface layer. Differences in diatom assemblages were associated with the complex hydrography of the WSC region.
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