Effects of salinity,temperature, and light intensity on the growth rates of two halophilic phytoflagellates in mixed culture |
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| Authors: | F H Chang Robert G Wear John Reynolds |
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| Institution: | 1. New Zealand Oceanographic Institute, Division of Marine and Freshwater Science, Department of Scientific and Industrial Research , Private Bag, Kilbirnie, Wellington, New Zealand;2. Island Bay Marine Laboratory, Department of Zoology , Victoria University of Wellington , Private Bag, Wellington, New Zealand;3. Applied Mathematics Division, Department of Scientific and Industrial Research , P. O. Box 1335, Wellington, New Zealand |
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| Abstract: | Growth rates of two halophilic phytoflagellates, Dunaliella euchlora Lerche and D. salina Teodoresco, were studied in mixed batch cultures grown in filtered, axenic brines from Lake Grassmere, New Zealand. Forty‐five combinations of temperature, salinity, and light intensity were used. A maximum growth rate of 1.50 doublings day‐1 was attained by D. salina at 26°C, 190 × 10‐3S at a light intensity of 126 μE m‐2 s‐1. D. euchlora showed maximum growth rate of 1.16 doublings day‐1 at 20°C, 120 × 10‐3S at a light intensity of 180 μE m‐2s‐1. Predicted maximum values of 1.41 and 1.14 doublings day‐1 respectively were obtained from regression models based on 45 replicate treatment combinations. In decreasing order of importance, temperature, salinity, and light intensity influence growth rates of brine algae. The optimum temperature for growth of both species increased as the salt concentration increased but decreased with increasing light intensity. |
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| Keywords: | salinity temperature light growth phytoflagellates Dunaliella euchlora Lerche D salina Teodoresco algae brines |
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