Abstract
ABSTRACT Population dynamics and primary productivity of Cryptomonas ovata were investigated in a riverine zone of Pal'tang Reservoir from April through November in 1997. Standing crops of C. ovata ranged from 0.4 to 52 % of total phytoplankton cell number. Its productivity varied from 2.8 to 137.9 μg Cl−1 hr−1 (ca. 1 to 74 % of total productivity) and contributed ca. 28 % of total phytoplankton productivity on an annual basis. Species-specific productivity (SSP) of C. ovata fluctuated between 14.6 and 81.5 pg C cell−1 hr−1 and its seasonal trend was not clear. Volume-specific SSP (SSP/cell volume) of C. ovata was significantly higher in summer, which suggests high growth rate potential at higher temperatures (23–27 °C). However, the C. ovata population reached its maximam density in spring.
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