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New Zealand Journal of Marine and Freshwater Research abstracts

Effects of salinity, temperature,and light intensity on the growth rates of two halophilic phytoflagellates in mixed culture

F. H. CHANG
ROBERT G. WEAR
JOHN REYNOLDS3

1New Zealand Oceanographic Institute Division of Marine and Freshwater Science Department of Scientific and Industrial Research Private Bag, Kilbirnie Wellington New Zealand
Island Bay Marine Laboratory Department of Zoology Victoria University of Wellington Private Bag, Wellington New Zealand
Applied Mathematics Division Department of Scientific and Industrial Research P. O. Box 1335, Wellington New Zealand

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 day1 was attained by D. salina at 26°C, 190 X 10~3S at a light intensity of 126 |iE m~2 s"1. D. euchlora showed maximum growth rate of 1.16 doublings day1 at 20°C, 120 X 10 3S at a light intensity of 180nEm-2s'. Predicted maximum values of 1.41 and 1.14 doublings day1 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. Received 21 June 1985; accepted 11 February 1986

Keywords salinity; temperature; light; growth; phytoflagellates; Dunaliella euchlora Lerche; D. salina Teodoresco; algae; brines

New Zealand Journal of Marine and Freshwater Research, 1986, Vol. 20: 467-478 Received 21 June 1985; accepted 11 February 1986

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