Data for: Warmer temperatures limit the effects of antidepressant pollution on life history traits

Pharmaceutical pollutants pose a threat to aquatic ecosystems worldwide.
Yet, few studies have considered the interaction between pharmaceuticals
and other chronic stressors contemporaneously, even though the
environmental challenges confronting animals in the wild seldom, if ever,
occur in isolation. Thermal stress is one such environmental challenge
that may modify the threat of pharmaceutical pollutants. Accordingly, we
investigated how fluoxetine (Prozac), a common psychotherapeutic and
widespread pollutant, interacts with temperature to affect life-history
traits in the water flea, Daphnia magna. We chronically exposed two
genotypes of Daphnia to two ecological relevant concentrations of
fluoxetine (30ng/L and 300ng/L) and a concentration representing levels
used in acute toxicity tests (3000ng/L), and quantified the change in
phenotypic trajectories at two temperatures (20°C and 25°C). Across
multiple life-history traits, we found that fluoxetine exposure impacted
the fecundity, body size and intrinsic growth rate of Daphnia in a
non-monotonic manner at 20°C, and often in genotypic-specific ways. At
25°C, however, the life-history phenotypes of individuals converged under
the widely varying levels of fluoxetine, irrespective of genotype. Our
study underscores the importance of considering the complexity of
interactions that can occur in the wild when assessing the effects of
chemical pollutants on life-history traits.