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4% (t-test, p http://www.selleckchem.com/products/a-1331852.html no significant differences in population growth rate among the treatments illuminated with different wavelength lights (r?=?0.53?��?0.02 to 0.55?��?0.04 at 3.8?W/m2 and 0.56?��?0.01 to 0.60?��?0.03 at 6.2?W/m2). Under 0.5 and 1.6?W/m2 http://www.selleck.cn/products/PLX-4720.html of light intensity condition, the 470-nm light induced lowest population growth rates (r?=?0.56?��?0.03 and 0.57?��?0.00, respectively) than other wavelengths (Tukey�CKramer test, p http://www.selleckchem.com/products/avelestat-azd9668.html rotifer species we studied and freshwater B. calyciflorus have a very similar eyespot structure [9], their eyespot absorbance varies. This may explain the differences in their patterns of phototaxis. On the other hand, we could not find any differences in the patterns of these parameters between our two test species. We also could not find any differences in light sensitivity among the four types of females or between males and females. This is probably due to similar absorbance of eyespots among female types and male. Littoral rotifers show reverse diel vertical migration compared to other zooplankton and phytoplankton [13, 14]. They migrate up in the morning with the highest densities in the surface at midday (about 480�C960?W/m2, [13, 15]) and down at night. In this study, all light treatments induced positive phototaxis of rotifers compared to darkness. The rotifers showed strong positive phototaxis under 470 and 525?nm of lower intensity light (at 0.5 and 6.2?W/m2), and positive phototaxis that became weak or absent with the increase light intensity (at 15.0 and 30.0?W/m2), even under 470 and 525?nm of light. The results of our study differ to the reverse migration seen in rotifers in nature.