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Trait-mediated indirect effects, predators, and disease: test of a size-based model

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Abstract

Increasing prevalence of wildlife disease accentuates the need to uncover drivers of epidemics. Predators can directly influence disease prevalence via density-mediated effects (e.g., culling infected hosts leading to reduced disease prevalence). However, trait-mediated indirect effects (TMIEs) of predators can also strongly influence disease—but predicting a priori whether TMIEs should increase or decrease disease prevalence can be challenging, especially since a single predator may elicit responses that have opposing effects on disease prevalence. Here, we pair laboratory experiments with a mechanistic, size-based model of TMIEs in a zooplankton host, fungal parasite, multiple predator system. Kairomones can either increase or decrease body size of the host Daphnia, depending on the predator. These changes in size could influence key traits of fungal disease, since infection risk and spore yield increase with body size. For six host genotypes, we measured five traits that determine an index of disease spread (R 0). Although host size and disease traits did not respond to kairomones produced by the invertebrate predator Chaoborus, cues from fish reduced body size and birth rate of uninfected hosts and spore yield from infected hosts. These results support the size model for fish; the birth and spore yield responses should depress disease spread. However, infection risk did not decrease with fish kairomones, thus contradicting predictions of the size model. Exposure to kairomones increased per spore susceptibility of hosts, countering size-driven decreases in exposure to spores. Consequently, synthesizing among the relevant traits, there was no net effect of fish kairomones on the R 0 metric. This result accentuates the need to integrate the TMIE-based response to predators among all key traits involved in disease spread.

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Acknowledgments

This research was supported by National Science Foundation grants DEB 0613510, 0614316, 1120804, and 1120316.

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Authors and Affiliations

  1. Program in Ecology, Evolution and Conservation Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    Christopher R. Bertram & Carla E. Cáceres

  2. School of Integrative Biology, University of Illinois at Urbana-Champaign, 515 Morrill Hall, Urbana, IL, 61801, USA

    Christopher R. Bertram, Mark Pinkowski & Carla E. Cáceres

  3. Department of Biology, Indiana University, Bloomington, IN, 47405, USA

    Spencer R. Hall

  4. Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, 48109, USA

    Meghan A. Duffy

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  1. Christopher R. Bertram
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  2. Mark Pinkowski
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  4. Meghan A. Duffy
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  5. Carla E. Cáceres
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Correspondence to Carla E. Cáceres.

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Communicated by Steven Kohler.

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Bertram, C.R., Pinkowski, M., Hall, S.R. et al. Trait-mediated indirect effects, predators, and disease: test of a size-based model. Oecologia 173, 1023–1032 (2013). https://doi.org/10.1007/s00442-013-2673-0

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