Effect of UV-B radiation on the population dynamics of the rotifer Brachionus urceus |
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| Authors: | WANG Jinhe FENG Lei and TANG Xuexi |
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| Institution: | 1.College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China;Dong Ying City Ocean and Fishery Bureau, Dongying 257091, China2.Department of Agricultural Engineering, Dongying Vocational College, Dongying 257091, China3.College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China |
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| Abstract: | The effect of UV-B radiation enhancement at experimental doses of 0.00, 0.24, 0.48, 0.72, 0.96,
and 1.20 kJ/m2 on the population dynamics of the rotifer Brachionus urceus feeding on the alga
Chlorella sp. was studied under controlled laboratory conditions using clonal culture and life-table
techniques. The results show that UV-B radiation treatment significantly shortened the survival
time of the rotifer (P <0.05): The longest survival time (336 h) occurred in the control (0.00
kJ/m2) while the shortest (222 h) occurred when exposed to the highest UV-B radiation treatment
(1.20 kJ/m2). The fecundity of the rotifer B. urceus was enhanced by the lower UV-B radiation
treatment (0.24 and 0.48 kJ/m2) but inhibited by the higher treatments (0.96 and 1.20 kJ/m2). Life
expectancy also was obviously affected by UV-B radiation (P <0.05). The highest life expectancy
occurred in the control (0.00 kJ/m2), and it became shorter with increasing doses of UV-B radiation.
The resutls in the present study indicate that the life expectancy of the rotifer B. urceus can be
used as an indicator for UV-B radiation enhancement. |
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| Keywords: | UV-B radiation marine rotifer Brachionus urceus population dynamics |
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