Abstract
The effect of temperature on the life history characteristics of amictic females (AF), unfertilized mictic females (UMF) and fertilized mictic females (FMF) inBrachionus calyciflorus was studied with replicated individual cultures at 20°C, 25°C and 30°C, and with algaeScenedesmus obliquus for their food. There were highly significant effects of both temperature and female type, independently and interactively, on the duration of juvenile and post-reproduction periods, and the number of eggs produced by the rotifer per life cycle. Among all the temperature-female type combinations, all the juvenile periods of FMF, and the post-reproduction periods of UMF and FMF at 20°C, were the longest, and the number of eggs produced by an UMF at 30°C was the highest. There were highly significant effects of both temperature and female type on the duration of the reproduction period, but no clear correlation was observed between temperature and female type. The reproduction period of AF was longer than that of UMF and FMF. Only temperature influenced significantly the mean life-span of the three types of female. The duration of juvenile, reproduction and post-reproduction periods as well as the life-span of the three types of females were all reduced very significantly with rise of temperature, but the rates of reduction varied with female type. Among the three types of females, the number of eggs produced per life cycle by an UMF was the highest, and that of a FMF was the lowest. A significant relationship between the number of eggs produced per life cycle and temperature was observed only in the UMF.
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Projects supported by NSFC (No. 39870158), Natural Science Foundation of Anhui Province (No. 100330: No. 042416) and the Excellent Youth Foundation (No. 04043050).
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Yilong, X., Xiangfei, H. Temperature effect on the life history of three types ofBrachionus calyciflorus females. Chin. J. Ocean. Limnol. 22, 192–197 (2004). https://doi.org/10.1007/BF02842592
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DOI: https://doi.org/10.1007/BF02842592