The effects of food level on the life history variables of the two closely related rotifer species Keratella tropica and Keratella valgaYi-Long Xi, Qi-Ce Ruan, Dan-Dan Xu and Hong-Yu YuAnn. Limnol. - Int. J. Lim., 53 (2017) 153-160DOI: https://doi.org/10.1051/limn/2017002