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The Ecology of Yeasts in the Bark Beetle Holobiont: A Century of Research Revisited

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Abstract

Yeasts are extremely common associates of scolytine bark beetles, yet the basic ecology of yeasts in the bark beetle holobiont remains poorly understood. Yeasts are present in all beetle life stages and consistently isolated from adult, larval, and pupal integuments and mycangial structures, but yeasts are also found in oviposition galleries, pupal chambers, larval and adult digestive tracts, as well as phloem and xylem tissues. Yeasts in the Saccharomycetaceae family are the most prevalent associates, and most individual beetles are associated with only one or several yeast species. Kuraishia capsulata and Ogataea pini are the most commonly encountered yeast species in surveys of Dendroctonus and Ips beetles; most beetles that have been surveyed are vectors for one or both yeasts. Yeasts have significant but often overlooked functional roles in bark beetle ecology. Infochemicals resulting from volatile production by yeast have wide-ranging bioactivity for arthropods: Yeast emissions attract beetles at low concentrations but repel beetles at high concentrations, and yeast emissions can also serve as cues to predators and parasites of bark beetles. In some cases, yeasts can modify tree chemistry over time or metabolize toxic terpenoids, though potential consequences for beetle performance or the growth of nutritional fungi remain to be demonstrated. Also, the presence of yeast species can restrict or promote the establishment and growth of filamentous fungi, including mutualists, entomopathogens, and opportunistic saprophytes. The role of yeasts as nutritional symbionts has received mixed support, though a nutritional hypothesis has not been extensively tested. Continued research on the functional ecology of bark beetle–yeast associations is needed to better understand the emergent properties of these complex symbiont assemblages.

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Acknowledgments

I am grateful to Dr. Gerardo Zúñiga for providing data from yeast biodiversity surveys that was used to develop the table of beetle–yeast associations. Dr. Kyria Boundy-Mills provided literature and thoughtful discussion about this manuscript. I also thank Dr. Jennifer Talbot for encouraging this submission, and I appreciate the efforts of the referees who provided commentary and helped to improve this manuscript. Financial support for TSD was provided by through the Regional Approaches to Climate Change Project, U.S.D.A. NIFA Award #2011-68002-30191.

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  1. Department of Plant, Soil, and Entomological Sciences, University of Idaho, 875 Perimeter Drive, Moscow, ID, 83843-2339, USA

    Thomas Seth Davis

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Davis, T.S. The Ecology of Yeasts in the Bark Beetle Holobiont: A Century of Research Revisited. Microb Ecol 69, 723–732 (2015). https://doi.org/10.1007/s00248-014-0479-1

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