Abstract
Holst and Giesy [1] reported photoenhanced effects of anthracene exposure on reproduction of Daphnia magna in terms of total clutch size and survival over a 21-d period. A reappraisal of those experiments, using additional data regarding time to first brood, average size of first brood and the intrinsic rate of increase, rm, for exposures with and without anthracene and/or ultraviolet radiation (UVR), reveals that inferred impacts on genetic fitness as exemplified by rm are significant only for the highest exposure tested, whereas ecological fitness, measured by the time to first brood, was unimpaired at any combination of UVR and anthracene.
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