title: Herbivore-induced plant volatiles accurately predict history of coexistence, diet breadth, and feeding mode of herbivores.
abstract: Herbivore-induced plant volatiles (HIPVs) serve as specific cues to higher trophic levels. Novel, exotic herbivores entering native foodwebs may disrupt the infochemical network as a result of changes in HIPV profiles. Here, we analysed HIPV blends of native Brassica rapa plants infested with one of 10 herbivore species with different coexistence histories, diet breadths and feeding modes. Partial least squares (PLS) models were fitted to assess whether HIPV blends emitted by Dutch B. rapa differ between native and exotic herbivores, between specialists and generalists, and between piercing-sucking and chewing herbivores. These models were used to predict the status of two additional herbivores. We found that HIPV blends predicted the evolutionary history, diet breadth and feeding mode of the herbivore with an accuracy of 80% or higher. Based on the HIPVs, the PLS models reliably predicted that Trichoplusia ni and Spodoptera exigua are perceived as exotic, leaf-chewing generalists by Dutch B. rapa plants. These results indicate that there are consistent and predictable differences in HIPV blends depending on global herbivore characteristics, including coexistence history. Consequently, native organisms may be able to rapidly adapt to potentially disruptive effects of exotic herbivores on the infochemical network.
authors.affiliation: Molecular Interaction Ecology, Institute for Water and Wetland Research (IWWR), Radboud University, PO Box 9010, 6500, GL Nijmegen, the Netherlands.
authors.forename: Holger
authors.initials: H
authors.lastname: Danner
authors.affiliation: Institute of Biology, University of Neuchâtel, Neuchâtel, 2000, Switzerland.|European Biological Control Laboratory, USDA-ARS, CS 90013, Montferrier-sur-Lez, France.
authors.forename: Gaylord A
authors.initials: GA
authors.lastname: Desurmont
authors.affiliation: Life Science Trace Gas Facility, Institute for Molecules and Materials, Radboud University, 6500, GL Nijmegen, the Netherlands.
authors.forename: Simona M
authors.initials: SM
authors.lastname: Cristescu
authors.affiliation: Molecular Interaction Ecology, Institute for Water and Wetland Research (IWWR), Radboud University, PO Box 9010, 6500, GL Nijmegen, the Netherlands.|German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, Leipzig, 04103, Germany.|Institute of Ecology, Friedrich Schiller University Jena, Dornburger-Str. 159, Jena, 07743, Germany.
authors.forename: Nicole M
authors.initials: NM
authors.lastname: van Dam
mesh_terms: D000818:Animals; D001937:Brassica / Q000378:metabolism; D004032:Diet; D016002:Discriminant Analysis; D060434:Herbivory / Q000502:physiology*; D016018:Least-Squares Analysis; D008954:Models, Biological; D018411:Spodoptera / Q000502:physiology; D055549:Volatile Organic Compounds / Q000378:metabolism*
chemical_list: D055549:Volatile Organic Compounds
keywords: Brassicaceae; aphids; caterpillars; invasive herbivores; isothiocyanates; plant-herbivore interactions; slugs; terpenes