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Effects of dicofol concentration and food density on the population growth of rotifer Brachionus calyciflorus


Effects of dicofol concentration and food density on the population growth of rotifer Brachionus calyciflorus



Shengtaixue Zazhi 27(4): 578-582



By the method of population accumulative culture, this paper studied the effects of different concentration (0.03, 0.3, 3.0, 30 and 300 mu g center dot L-1) of dicofol and different algal food densities (3.0 and 5.0 x 10(6) cells - ml(-1) of Scenedesmus obliquus) on the population growth of rotifer Brachionus calyciflorus. The results showed that dicofol concentration, algal food density, and their interaction had significant effects on the population growth rate of the rotifer ( P < 0.05). Both algal food density and dicofol concentration. affected the maximal population density (P < 0.01) significantly, but the reverse was found for their interaction (P > 0.05). Compared with the control, when the algal density was 3.0 x 10(6) cells center dot ml(-1), the population growth rate of the rotifer had a significant increase at 0.03-30 mu g center dot L-1 of dicofol, and its maximal population density was decreased at 3 mu g center dot L-1 of dicofol but increased at 300 mu g center dot L-1 of dicofol significantly. However, when the algal. density was 5.0 x 10(6) cells - ml dicofol had no significant effects both on the population growth rate and on the maximal population density of the rotifer. The results suggested that higher algal food densities mitigated the stimulating effects of dicofol at 0.03-30 mu g center dot L-1 and 300 mu g center dot L-1 on the population growth rate and maximal population density of B. calyciflorus, and the repressing effect of dicofol at 3 mu g center dot L-1 on the maximal population density of the rotifer.

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