Abstract
Abstract Nitrate and ammonium uptake and ammonium regeneration rates were measured with 15N incubations during the austral summer period of 1995–1996 in the Bransfield Strait region (Antarctica). The objective was to quantify new and regenerated production in three zones that included stations with high phytoplankton biomass dominated by large and chain-forming diatoms (Strait of Gerlache) or colonies of Phaeocystis (Bellingshausen Sea), and stations with low phytoplankton biomass and high abundance of Cryptophyceae and other flagellates (western Bransfield Strait). All zones were characterized by high nitrate (>10 mmol N m−3) and low ammonium (generally
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