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The combined influence of trematode parasites and predatory salamanders on wood frog (Rana sylvatica) tadpoles

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Abstract

Predators can have important impacts on host–parasite dynamics. For many directly transmitted parasites, predators can reduce transmission by removing the most heavily infected individuals from the population. Less is known about how predators might influence parasite dynamics in systems where the parasite relies on vectors or multiple host species to complete their life cycles. Digenetic trematodes are parasitic flatworms with complex life cycles typically involving three host species. They are common parasites in freshwater systems containing aquatic snails, which serve as obligate first intermediate hosts, and multiple trematode species use amphibians as second intermediate hosts. We experimentally examined the impact of predatory salamanders (Ambystoma jeffersonianum) and trematode parasites (Echinostoma trivolvis and Ribeiroia ondatrae) on short-term survival of wood frog tadpoles (Rana sylvatica) in 150-L outdoor pools. Two trematode species were used in experiments because field surveys indicated the presence of both species at our primary study site. Parasites and predators both significantly reduced tadpole survival in outdoor pools; after 6 days, tadpole survival was reduced from 100% in control pools to a mean of 46% in pools containing just parasites and a mean of 49% in pools containing just predators. In pools containing both infected snails and predators, tadpole survival was further reduced to a mean of 5%, a clear risk-enhancement or synergism. These dramatic results suggest that predators may alter transmission dynamics of trematodes in natural systems, and that a complete understanding of host–parasite interactions requires studying these interactions within the ecological framework of community interactions.

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Acknowledgments

We thank Nichole Field and Eric Tobin for assistance with the experiment. We also thank the reviewers, whose thoughtful comments greatly improved the manuscript. Alexa Class, Christinia Schoch, and J.M.W. contributed artwork to the illustration in Fig. 1. Research funding was provided by the Virginia Tech Department of Biological Sciences and the Virginia Tech Advance program, which was supported by National Science Foundation Grant SBE-0244916. J.M.W. was supported by a MAP grant and the College of Science and Technology at Radford University. During the writing of this manuscript, support was provided by National Science Foundation DEB-0918960 (Belden) and DEB-0918656 (Wojdak).

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Correspondence to Lisa K. Belden.

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Communicated by Ross Alford.

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Belden, L.K., Wojdak, J.M. The combined influence of trematode parasites and predatory salamanders on wood frog (Rana sylvatica) tadpoles. Oecologia 166, 1077–1086 (2011). https://doi.org/10.1007/s00442-011-1946-8

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