Effects of temperature and salinity on increase in population density of alga Noctiluca scintillans
CAO Xinyu, LI Yuanmei, WANG Wei, LIU Qing*
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Key Laboratory for Hydrobiology in Liaoning Province, Dalian Ocean University, Dalian 116023, China
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Issue Date
2021-03-14
Abstract
Alga Noctilucascintillans was cultured and fed alga Dunaliellasalina in a light incubator at temperature of 12, 16, 20, 24, and 28 ℃ and a salinity of 18, 22, 26, 30, 34, 38, and 42 and then specific growth rate of the alga was determined to evaluate the effects of temperature and salinity on the increase in population density in alga N.scintillans under a laboratory condition. The results showed that there was negative value of growth rate of N.scintillans at 28 ℃, significantly different from those in the other four groups (P<0.05), and finally, the population density disappear to zero. The daily average growth rates of 0.18 was observed at 16, 20 and 24 ℃, with the maximal population density (10.0×103-10.6×103 ind./L), and without significant differences (P>0.05). The alga N.scintillans had continuous increase in population density, with the maximum of 14.8×103 ind./L at 12 ℃, with the regression equation between temperature and the number of N.scintillans as y=-18.424x3+1 055x2-19 822x+132 606 (R2=0.999 4). N.scintillans was shown to be survive at salinity of 18-42, with higher population densities at salinity of 18-26, especially, the maximum of up to 25.8×103 ind./L at a salinity of 26, followed by at a salinity of 30 and 34. However, poor growth was found in the alga exposed to a salinity of 38 and 42, with the maximal densities of only 3.8×103 and 3.0×103 ind./L, respectively. There was no significant difference in maximum population density between salinity 38 and salinity 42 (P>0.05), significantly different from the other groups (P<0.05). The regression equation between salinity and the number of N.scintillans was expressed as y=-0.086 3x5+12.641x4-717.19x3+19 600x2-257 671x+105(R2=0.875 6). The findings provide some theoretical reference with predicting the occurrence of red tide induced by N. scintillans and protecting marine ecological environment.
CAO Xinyu, LI Yuanmei, WANG Wei, LIU Qing.
Effects of temperature and salinity on increase in population density of alga Noctiluca scintillans[J]. Journal of Dalian Fisheries University, 2021, 36(1): 95-102 https://doi.org/10.16535/j.cnki.dlhyxb.2019-275
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