Section 10
Chapter 9,101

Nitrogenous nutrient uptake by phytoplankton and ammonium regeneration by microbial assemblage in Lake Biwa

Takahashi, M.; Hama, T.; Matsunaga, K.; Handa, N.

Journal of Plankton Research 17.5


ISSN/ISBN: 0142-7873
DOI: 10.1093/plankt/17.5.1027
Accession: 009100365

In situ rates of nitrate, ammonium and urea uptake by the phytoplankton assemblage, and the regeneration rate of ammonium by the microbial assemblage, in Lake Biwa were measured using the nitrogen 15 tracer method from 1985 to 1987. The rate of total nitrogen (sum of ammonium, nitrate and urea) uptake was in the range of 62-594 ng N l-1 h-1. The percentage contribution of ammonium uptake was 41-92%, that of urea 4-58% and that of nitrate lt 1-28% of total uptake.

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