Effects of nanoparticles of TiO2 on food depletion and life-history responses of Daphnia magna

► We studied effects of TiO2 nanoparticles on Daphnia magna life-history traits across food levels. ► Nanoparticles aggregated to algae, increasing sedimentation rates and diminishing food levels. ► Nanoparticle mediated effects on food levels had dramatic effects on reproduction under limited food. ► Results indicate that nanoparticles by aggregating to algae and diminishing food levels impaired D. magna fitness at low food levels.