Abstract
Intraguild predation among natural enemies is common in food webs with insect herbivores at their base. Though intraguild predation may be reciprocal, typically one species suffers more than the other and frequently exhibits behavioural strategies to lessen these effects. How such short-term behaviours influence population dynamics over several generations has been little studied. We worked with a model insect community consisting of two species of aphid feeding on different host plants (Acyrthosiphon pisum on Vicia and Sitobion avenae on Triticum), a parasitoid (Aphidius ervi) that attacks both species, and a dominant intraguild predator (Coccinella septempunctata) that also feeds on both aphids (whether parasitized or not). As reported previously, we found A. ervi avoided chemical traces of C. septempunctata. In population cages in the laboratory, application of C. septempunctata extracts to Vicia plants reduced parasitism on A. pisum. This did not increase parasitism on the other aphid species, our predicted short-term trait-mediated effect. However, a longer term multigenerational consequence of intraguild predator avoidance was observed. In cages where extracts were applied in the first generation of the study, parasitoid recruitment was reduced leading to higher population densities of both aphid species. S. avenae thus benefits from the presence of a dominant intraguild predator foraging on another species of aphid (A. pisum) on a different food plant, a long-term, trait-mediated example of apparent mutualism. The mechanism underlying this effect is hypothesized to be the reduced searching efficiency of a shared parasitoid in the presence of cues associated with the dominant predator.
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Acknowledgments
We especially thank Richard Comont for sharing his expertise in rearing and collecting ladybirds and Clara Torres-Barceló, Piotr Łukasik, Margriet Van Asch, Lee Henry and Ailsa McLean for their help, valuable comments on the experimental set up and discussions. We are also grateful to two anonymous reviewers for their helpful comments. E. F. was funded by the Conselleria d’Educació de la Generalitat Valenciana (Spain) Programa VALi + d per a Investigadors en Fase Postdoctoral programme (APOSTD/2010/062). We also acknowledge support from the E. P. Abraham Cephalosporin Trust.
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Communicated by George Heimpel.
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Frago, E., Godfray, H.C.J. Avoidance of intraguild predation leads to a long-term positive trait-mediated indirect effect in an insect community. Oecologia 174, 943–952 (2014). https://doi.org/10.1007/s00442-013-2799-0
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DOI: https://doi.org/10.1007/s00442-013-2799-0