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Food quality can influence the growth and reproduction of zooplankton in freshwater systems. Food size, element ratios, biochemical composition and toxicity are indicative of food quality. The C / P ratios of Scenedesmus obliquus was used to represent the food quality in this experiment. We analyzed the effects of S. obliquus with different C / P ratios on the growth and reproduction of Daphnia similis. The C / P ratios of S. obliquus in four treatments were 881.8, 512.3, 124.3 and 42.4, respectively. The growth rates of D. similis in four treatments were 0.15, 0.27, 0.47 and 0.44 d-1, respectively. D. similis did not release any offspring dur⁃ ing this period of growth in treatment with C / P = 881.8. The average numbers of offspring of first adult instar of D. similis in other three treatments were 1.2±1.3, 9.8±2.3 and 9.5±2.5 ind. / female, respectively. The results showed that the growth rate and off⁃ spring number of D. similis decreased when the C / P ratio of S. obliquus was too high (512.3 and 881.8) or too low (42.4) com⁃ pared with C / P = 124.3. Our study indicated that different C / P ratios of food could affect the growth and reproduction of Daphnia, thus determining their survival in freshwater lakes.

Effects of Scenedesmus obliquus with different C/P ratios on the growth and reproduction of Daphnia similis