THE EVALUATION OF THE GROWTH PERFORMANCE OF A CYANOBACTERIAL ISOLATE PHORMIDIUM LUCIDUM (KÜTZİNG EX GOMONT 1892) GROWN UNDER DIFFERENT ENVIRONMENTAL CONDITIONS AND ITS USE AS A DIETARY SOURCE FOR DAPHNIA MAGNA (STRAUS 1820)

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Karakaş K., Eryalçın K. M., Ergönül M. B., Atıcı T., Atasagun S.

Communications/ Faculty of Sciences University of Ankara Series C: Biology and Geological Engineering and Geophysical Engineering, cilt.32, sa.1, ss.70-86, 2023 (Hakemli Dergi)

Özet

This study presents the effect of cyanobacterium isolated from Bolluk
Lake (Konya, Türkiye) which is a saline lake on the growth performance of Daphnia
magna. Isolated cyanobacteria species were identified as Phormidium lucidum
according to its 16S rDNA sequences. The effects of different growth conditions
including pH (7.18, 8.15, 9.17 and 10.26), light intensity (1200, 2400, 3600 and 4800
lux), temperature (10, 20, 25 and 30°C) and nitrogen concentrations (0.25, 0.5, 1.0 and
1.5 g/L) on P. lucidum was studied. Effects of each environmental factor on
biochemical composition (total protein, total lipid and chlorophyll-a concentration) of
P. lucidum were also studied. The optimum growth conditions were found as pH 7.18,
ambient temperature 20°C, nitrogen 0.25 g/L and light intensity 3600 lux, after a 2-
week incubation period. The effects of various mixtures of the cyanobacteria and
Chlorella vulgaris which is a common feed for Daphniids were also evaluated for their
effects on the growth rates of D. magna. The best growth rate for D. magna was
obtained in the medium containing 100% P. lucidum at the end of the 13ᵗ ͪ day.