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Hydrobiologia

, Volume 332, Issue 2, pp 99–109 | Cite as

Optimum growth conditions and light utilization efficiency of Spirulina platensis (= Arthrospira fusiformis) (Cyanophyta) from Lake Chitu, Ethiopia

  • Elizabeth Kebede
  • Gunnel Ahlgren
Article

Abstract

Spirulina platensis (= Arthrospira fusiformis) was isolated from Lake Chitu, a saline, alkaline lake in Ethiopia, where it forms an almost unialgal population. Optimum growth conditions were studied in a turbidostat. Cultures grown in modified Zarrouk's medium and exposed to a range of light intensities (20–500 µmol photons m−2s−1) showed a maximum specific growth rate (µmax) of 1.78 d−1. Quantum yield for growth (Φµ) was 3.8% at the optimum light for growth of 330 µmol photons m−2s−1, and ranged from 2.8 to 9.4%. With increase in irradiance, the chlorophyll a concentration decreased, and the carotenoids/chlorophyll a ratio increased by a factor of 2.4. The phosphorus to carbon ratio (P/C) showed some variation, while the nitrogen to carbon ratio (N/C) remained relatively constant, thus causing fluctuations in the N:P ratio (7–11) of cells. An optimum N:P ratio of about 7 was attained in cells growing at the optimum light for growth. Results from the continuous culture experiments agreed well with maximum values of photosynthetic efficiency given in the literature for natural populations of S. platensis in the soda lakes of East Africa, Lake Arenguade (Ethiopia), and Lake Simbi (Kenya).

Key words

Arthrospira Chitu Ethiopia growth light nutrient status quantum yield Spirulina 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Elizabeth Kebede
    • 1
  • Gunnel Ahlgren
    • 1
  1. 1.Institute of LimnologyUppsala UniversityUppsalaSweden

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