Nitrogen fixation, ammonium and nitrate uptake during a bloom of Cylindrospermopsis raciborskii in Lake Balaton

Mátyás Présing, Sándor Herodek, Lajos Vörös, István Kóbor

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Abstract

N2-fixation and 15N-labelled ammonium and nitrate uptake were measured during a bloom of C. raciborskii in two basins of Lake Balaton. In the eastern basin when the chlorophyll-a content reached 70 μg/l the N2- fixation was low (59 mg N m-2 day-1) and the N uptake was dominated by ammonium (393 mg N m-2 day-1). The nitrate uptake was of minor importance in both basins (43 and 55 mg N m-1 day-1, respectively). In the western basin, the chlorophyll-a tentent was 160μg/l and recirculation of regenerated forms of nitrogen could not support the demand. Although the ammonium uptake was high (357 mg N m-2 day-1), the fixed nitrogen (407 mg Nm-2 day-1) exceeded it. The daily integrated carbon and nitrogen uptake ratios were 5.2 (weight/weight) in both basins.

Original languageEnglish
Pages (from-to)553-562
Number of pages10
JournalArchiv fur Hydrobiologie
Volume136
Issue number4
Publication statusPublished - Jan 1 1996

ASJC Scopus subject areas

  • Aquatic Science

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