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

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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).

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  1. Elizabeth Kebede

    Present address: Biology Department, Addis Ababa University, P.O. Box 3434, Addis Ababa, Ethiopia

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  1. Institute of Limnology, Uppsala University, Norbyvägen 20, 752 36, Uppsala, Sweden

    Elizabeth Kebede & Gunnel Ahlgren

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  1. Elizabeth Kebede
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  2. Gunnel Ahlgren
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Kebede, E., Ahlgren, G. Optimum growth conditions and light utilization efficiency of Spirulina platensis (= Arthrospira fusiformis) (Cyanophyta) from Lake Chitu, Ethiopia. Hydrobiologia 332, 99–109 (1996). https://doi.org/10.1007/BF00016689

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  • DOI: https://doi.org/10.1007/BF00016689

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