The effects of carbon fullerenes (C60) on the environment is a growing concern as the use of nanotechnology continues to increase. Previous studies have reported alteration in Daphnia magna behavior, including increased hopping frequency, heart rate, and appendage movement in response to tetrahydrofuran-solubilized C60 and increased hopping rate and appendage movement in response to tetrahydrofuran-solubilized C60HxC70Hx exposure. The objective of the current study was to evaluate effects of water-stirred C60 and sonicated carboxylic acid functionalized fullerenes (fC60) on D. magna behavior. Behavioral endpoints are important because changes in behavior can influence predator avoidance behaviors, alter predation risk, and potentially lead to population-level effects in D. magna. To evaluate the potential effect of fullerenes on phototactic behavior, D. magna were exposed to 545.4μg/L C60 and 545.6μg/L fC60, and vertical position was monitored. Daphnia magna were also exposed to 545.4μg/L C60, 545.6μg/L fC60, and 829.3μg/L fC60, and swimming movements were recorded. Fullerenes altered the vertical migration response of D. magna to the addition of food, but D. magna vertical position response to predator cues was similar for fullerenes and controls. In addition, D. magna reduced swimming speed when exposed to C60, but other components of D. magna swimming behavior were not affected. This research supports previous findings and suggests that C60 may influence D. magna behavior and highlights the need for further research on sublethal behavioral modifications in aquatic organisms in response to nanomaterials.
- Vertical migration