Abstract
Natural and anthropogenic stressors typically do not occur in isolation; therefore, understanding ecological risk of contaminant exposure should account for potential interactions of multiple stressors. Realistically, common contaminants can also occur chronically in the environment. Because parental exposure to stressors may cause transgenerational effects on offspring, affecting their ability to cope with the same or novel environmental stressors, the exposure histories of generations preceding that being tested should be considered. To examine multiple stressor and parental exposure effects we employed a 2 × 2 × 2 factorial design in outdoor 1000-L mesocosms (n = 24). Larval southern toads (Anaxyrus terrestris), bred from parents collected from reference and metal-contaminated sites, were exposed to two levels of both an anthropogenic (copper—0, 30 µg/L Cu) and natural (predator cue − present/absent) stressor and reared to metamorphosis. Toads from the metal-contaminated parental source population were smaller at metamorphosis and had delayed development; i.e., a prolonged larval period. Similarly, larval Cu exposure also reduced size at metamorphosis and prolonged the larval period. We, additionally, observed a significant interaction between larval Cu and predator-cue exposure on larval period, wherein delayed emergence was only present in the 30-µg/L Cu treatments in the absence of predator cues. The presence of parental effects as well as an interaction between aquatic stressors on commonly measured endpoints highlight the importance of conducting multistressor studies across generations to obtain data that are more relevant to field conditions in order to determine population-level effects of contaminant exposure.
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Acknowledgments
We thank R. Philipps and J. Seaman for help with metals analysis. We also thank R. Beasley, A. Coleman, R.W. Flynn, C. Love, and M. Winzeler for assitance with husbandry. An earlier version of this manuscript was improved by comments by R. Bringolf, A. Davis, R. W. Flynn and two anonymous reviewers. Project funding was provided by the Department of Energy National Nuclear Security Administration. This research was partially supported by U. S. Department of Energy under Award Number DE–FC09–07SR22506 to the University of Georgia Research Foundation. This research made possible by the status of the SRS as a National Environmental Research Park (NERP), as well as the protection of research wetlands in the SRS Set-Aside Program.
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All procedures performed in studies involving animals were in accordance with ethical standards of the University of Georgia IACUC following procedures approved under AUP A2009 10-175-Y2-A0 Animals were collected under SCDNR permit #G-09-03. Informed consent was obtained from all individual participants included in the study.
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Rumrill, C.T., Scott, D.E. & Lance, S.L. Effects of metal and predator stressors in larval southern toads (Anaxyrus terrestris). Ecotoxicology 25, 1278–1286 (2016). https://doi.org/10.1007/s10646-016-1681-3
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DOI: https://doi.org/10.1007/s10646-016-1681-3