Differences in nitrate and ammonia uptake among components of a phytoplankton population

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Abstract
We examined the NO3− and NH4+ uptake capabilities of the dinoflagellate Peridinium cinctum and of the accompanying nanoplankton during the spring P. cinctum bloom in Lake Kin-neret. Throughout the Peridinium season, the smaller algae had greater affinities and faster specific uptake rates for both NO3−and NH4+ It appears that P. cinctum cannot directly compete with nanoplankton for nitrogen nutrients. Other factors such as the ability of dinoflagellates to swim freely in the water column and low grazing pressures may explain their dominance in the lake.

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