Abstract
Mutualisms with facultative, non-essential heritable microorganisms influence the biology of many insects, and they can have major effects on insect host fitness in certain situations. One of the best-known examples is found in aphids where the facultative endosymbiotic bacterium Hamiltonella defensa confers protection against hymenopterous parasitoids. This symbiont is widely distributed in aphids and related insects, yet its defensive properties have only been tested in two aphid species. In a wild population of the grain aphid, Sitobion avenae, we identified several distinct strains of endosymbiotic bacteria, including Hamiltonella. The symbiont had no consistent effect on grain aphid fecundity, though we did find a significant interaction between aphid genotype by symbiont status. In contrast to findings in other aphid species, Hamiltonella did not reduce aphid susceptibility to two species of parasitoids (Aphidius ervi and Ephedrus plagiator), nor did it affect the fitness of wasps that successfully completed development. Despite this, experienced females of both parasitoid species preferentially oviposited into uninfected hosts when given a choice between genetically identical individuals with or without Hamiltonella. Thus, although Hamiltonella does not always increase resistance to parasitism, it may reduce the risk of parasitism in its aphid hosts by making them less attractive to searching parasitoids.
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Acknowledgments
P. Ł., J. F., H. C. J. G. designed the experiments. P. Ł., M. A. D. performed the experiments. P. Ł., J. F., H. C. J. G. analyzed the data and wrote the manuscript. We thank E. Frago, K. Oliver, J. Russell and K. Sullam for discussion and helpful comments on the manuscript. The work was supported by the UK Biotechnology and Biology Research Council award BB/E010857/1 and by a Sir Richard Southwood (Christensen Foundation) Graduate Scholarship to P. Ł.
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Communicated by George Heimpel.
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Łukasik, P., Dawid, M.A., Ferrari, J. et al. The diversity and fitness effects of infection with facultative endosymbionts in the grain aphid, Sitobion avenae . Oecologia 173, 985–996 (2013). https://doi.org/10.1007/s00442-013-2660-5
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DOI: https://doi.org/10.1007/s00442-013-2660-5