Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China; Nanjing Univ, Inst Environm Sci, Nanjing 210093, Jiangsu, Peoples R China
The effect of food concentration on the life history of three types of Brachionus calciflorus females (amictic, unfertilized mictic and fertilized mictic female) was studied with replicated individual cultures at 25 degrees and at four food concentrations (1.5, 3.0, 6.0 and 9.0 x 10(6) cells mL(-1)) of Scenedesmus obliquus. There were highly significant effects of both food concentration and female type, independently and in interaction on the duration of juvenile period of the rotifer, but neither a;ere the effects on the duration of post-reproductive period and mean life-span. The duration of juvenile period of unfertilized mictic female at the food concentration of 9.0 x 10(6) cells mL(-1) was the longest among all the food concentration-female type combinations. Both food concentration and female type influenced significantly the duration of reproductive period and the number of eggs produced by each type of female per life cycle, respectively. There was, however, no significant interaction between food level and female type. Among the three types of females, the number of eggs produced by an unfertilized mictic female was the largest. and that of a fertilized mictic female was the smallest.
YI-LONG XI; XIANG-FEI HUANG; HONG-JUN JIN and JIAN-KANG LIU.The effect of food concentration on the life history of three types of Brachionus calyciflorus females,INTERNATIONAL REVIEW OF HYDROBIOLOGY,2001,86(2):211-217