Phytoplankton Ecology in the Upper Swan River Estuary, Western Australia - Nitrogen uptake for inorganic and organic nitrogen sources

The main aim of this study was to detemine seasonal uptake kinetics for the different nitrogen species; two inorganic sources (NO3- and NH4+), and an organic source (urea) in the upper Swan River estuary from November 1997 to November 1998. Uptake kinetics were related to species composition and ambient concentrations of these three nitrogen sources to determine whether physiological adaptation to the ambient N-species concentrations present are indicated in seasonal species assemblages