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Reinforcing effects of non-pathogenic bacteria and predation risk: from physiology to life history

  • Physiological ecology - Original research
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Abstract

The important ecological role of predation risk in shaping populations, communities and ecosystems is becoming increasingly clear. In this context, synergistic effects between predation risk and other natural stressors on prey organisms are gaining attention. Although non-pathogenic bacteria can be widespread in aquatic ecosystems, their role in mediating effects of predation risk has been ignored. We here address the hypothesis that non-pathogenic bacteria may reinforce the negative effects of predation risk in larvae of the damselfly Coenagrion puella. We found synergistic effects for all three life history variables studied: mortality increased, growth reductions were magnified and bacterial load was higher when both non-lethal stressors were combined. The combined exposure to the bacterium and predation risk considerably impaired the two key antipredator mechanisms of the damselfly larvae: they no longer reduced their food intake under predation risk and showed a synergistic reduction in escape swimming speed. The reinforcing negative effects on the fitness-related traits could be explained by the observed synergistic effects on food intake, swimming muscle mass, immune function and oxidative damage. These are likely widespread consequences of energetic constraints and increased metabolic rates associated with the fight-or-flight response. We therefore hypothesize that the here documented synergistic interactions with non-pathogenic bacteria may be widespread. Our results highlight the ignored ecological role of non-pathogenic bacteria in reinforcing the negative effects of predation risk on prey organisms.

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Acknowledgments

L. J. is a Ph.D. fellow of the IWT, Flanders. R. S. received funding from the KU Leuven research fund (PF/2010/07) and the Fund for Scientific Research (FWO) Flanders.

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Authors and Affiliations

  1. Laboratory of Aquatic Ecology, Evolution and Conservation, University of Leuven, Charles Deberiotstraat 32, 3000, Louvain, Belgium

    Lizanne Janssens & Robby Stoks

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  1. Lizanne Janssens
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  2. Robby Stoks
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Correspondence to Lizanne Janssens.

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Communicated by Scott D. Peacor.

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Janssens, L., Stoks, R. Reinforcing effects of non-pathogenic bacteria and predation risk: from physiology to life history. Oecologia 176, 323–332 (2014). https://doi.org/10.1007/s00442-014-3030-7

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