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As part of a study of the ecological dynamics of the Antarctic ice-edge region, we sanlpled the tintinnine populations at 27 stations in the open water of the Weddell Sea near the edge of the seasonal pack-ice in November 1983. Additional samples were obtained from a second ship operating within the pack-ice. Tintinnine assemblages in the surface water were sparse (5 17 indiv~duals 1 ' ) and were primarily composed of the characteristically Antarctic genera Laackmannlella and Cymatocylis. Tintinnine abundance at the surface was positively correlated with phytoplankton biomass and productivity. Following nuclear staining, epifluorescence microscopy of material collected with vertical net-tows from within the surface mixed layer allowed the determination of the Frequency of Dividing Cells (FDC) for the 2 dominant taxa In these samples. Die1 periodicity was not observed in the division of either taxon. FDC for Laackmanniella spp. was similar to that previously observed for temperate estuarine tintinnines (40 to 6 0 % ) ; Cyniatocylis spp. displayed considerably lower FDC values. FDC for both taxa were unrelated to phytoplankton biomass or productivity. The 2 taxa displayed opposite patterns in the relation between FDC and latitude. Cymatocylis spp. had its highest FDC values at the northernmost stations, while FDC of Laackmanniella spp. increased with proximity to and beneath the pack-ice. These genera of tintinnines appear to be differentially responding to one or more factors related to latitude, even in the extremely restricted geographic range considered by this study.

Patterns of tintinnine abundance and reproduction near the edge of seasonal pack-ice in the Weddell Sea, November 1983