Photosynthetic characteristics and physiological plasticity of an Aphanizomenon flos-aquae (Cyanobacteria, Nostocaceae) winter bloom in a deep oligo-mesotrophic lake (Lake Stechlin, Germany)

Viktória Üveges, Kálmán Tapolczai, Lothar Krienitz, Judit Padisák

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37 Citations (Scopus)

Abstract

In winter of 2009/2010, Aphanizomenonflos-aquae bloomed in the ice and snow covered oligo-mesotrophic Lake Stechlin, Germany. The photosynthesis of the natural population was measured at eight temperatures in the range of 2-35°C, at nine different irradiance levels in the range of 0-1,320 μmol m -2 s -1 PAR at each applied temperature. The photoadaptation parameter (I k) and the maximum photosynthetic rate (P max) correlated positively with the temperature between 2 and 30°C, and there was a remarkable drop in both parameters at 35°C. The low I k at low temperatures enabled the active photosynthesis of overwintering populations at low irradiance levels under ice and snow cover. The optimum of the photosynthesis was above 20°C at irradiances above 150 μmol m -2 s -1. At lower irradiance levels (7. 5-30 μmol m -2 s -1), the photosynthesis was the most intensive in the temperature range of 2-5°C. The interaction between light and temperature allowed the proliferation of A. flos-aquae in Lake Stechlin resulting in winter water bloom in this oligo-mesotrophic lake. The applied 2°C is the lowest experimental temperature ever in the photosynthesis/growth studies of A. flos-aquae, and the results of the P-I and P-T measurements provide novel information about the tolerance and physiological plasticity of this species.

Original languageEnglish
Pages (from-to)263-272
Number of pages10
JournalHydrobiologia
Volume698
Issue number1
DOIs
Publication statusPublished - Apr 16 2012

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Keywords

  • Aphanizomenon flos-aquae
  • Cyanobacterial bloom
  • Ice cover
  • Oligo-mesotrophic Lake Stechlin
  • P-I and P-T characteristics
  • Physiological plasticity
  • Winter

ASJC Scopus subject areas

  • Aquatic Science

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