Variation of the Phytoplankton Community Across the Subtropical Convergence Zone in the West Pacific Sector of the Southern Ocean During Early Austral Summer 1995/6
1998
Lee Hak-Young Department of Biology, Pusan National University, Pusan 609-735 (Korea Republic) Richard M. Greene Department of Oceanography, Texas A&M University, College, Station, TX77843
Phytoplankton of the southern Ocean, 140-148 degrees E and 40-53 degrees S, was sampled from early austral summer Nov. 1995 to Dec. 1995 to examine cell abundance, cell volume and biomass (cell carbon) distribution across the fronts. A total of 90 phytoplankton taxa were identified. They were 50 diatoms, 37 dinoflagellates, 2 silicoflagellates, and 1 prymnesiophyte. 73 species were observed from north of the subtropical convergence zone and 71 species from south of the subtropical convergence zone, Pseudonitzschia spp. was the most widely distributed species. Nanoplankton predominated cell number of phytoplankton throughout the stations. The abundance of diatoms was higher than that of dinoflagellates. Total biomass profiles were dependent to microphytoplankton biomass. Maximum cell number and biomass were observed from subsurface layer. Phytoplankton community changed across the subtropical convergence zone and 50-53 degrees S (antarctic convergence zone), and physicochemical factors seem to control the distribution.
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