Abstract
Context
The bark beetle, Pityogenes chalcographus, is one of the main pests in Picea abies stands, and it has also been found on other European Pinaceae species. With massive introductions of North American conifer species into European forests, this insect has extended its host range to exotic Pinaceae species.
Aim
This study assessed whether a wider host range has influenced the genetic structure of P. chalcographus and has led to host specialization.
Methods
Insects were collected from two different regions of France, where eight native and exotic conifer species coexist and were analyzed using mitochondrial and nuclear genetic markers.
Results
Considerable haplotypic diversity was observed within the regions and within host species from where P. chalcographus populations were collected. No genetic differentiation, especially with respect to host species associations, could be detected. Moreover, no relationship could be established between closely related P. chalcographus haplotypes and taxonomically related conifer species.
Conclusion
The capacity of P. chalcographus for host shifting and dispersal may have played a key role in the rapid extension of its host range. These findings are important for pest management in forests and health and phytosanitary measures in the timber trade, especially for risk assessment in mixed coniferous forests including tree species of major economic importance.
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Acknowledgments
This work is part of the PhD thesis of C. Bertheau carried out under the direction of F. Lieutier with the participation of G. Roux-Morabito as a co-supervisor. We are grateful to Philippe Massot and Dominique Jacquin (Office National des Forêts) for their help in choosing the experimental plots and obtaining coniferous trees and to Jacques Garcia (INRA Orléans) for his field assistance. We thank Christian Stauffer (Vienna, Boku University) for providing European samples. We also thank Emmanuelle Magnoux (INRA Orléans) for her assistance with the ABI 3100 automatic sequencer and Vincent Lesieur (Orléans University trainee) for his technical participation. We are grateful to Dimitrios Avtzis (Vienna, Boku University) for his fruitful discussions and to Christian Stauffer (Vienna, Boku University) for his valuable remarks on the previous manuscript, as well as the two anonymous reviewers for their very useful and constructive comments.
Funding
The work was supported by grants from the French Ministry for Agriculture, Fisheries and Rural Affairs (General Directorate of Forests and Rural Affairs), from the French Ministry of Research and Education and from the Austrian Science Foundation (FWF) P 21147-B17.
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Contribution of the co-authors
Coralie Bertheau: was a PhD student in the University of Orléans (France) when the experiments took place. Now she is a post-doctoral research associate at the Institute of Forest Entomology, Forest Pathology and Forest Protection, Boku, University of Natural Resources and Life Sciences in Vienna (Austria). She coordinated the project from its elaboration until the submission of the paper. She designed the experiments, sampled beetles, did technical experiments and phylogenetic data analyses, and wrote the paper.
Stéphanie Bankhead-Dronnet: is Assistant Professor at the University of Orléans. She contributed in phylogenetic data analyses and in writing of the paper.
Carine Martin: is a technical assistant at the University of Orléans and participated to the sampling and the experimental work.
François Lieutier: is a Professor at the University of Orléans. He led this project, supervised the work, helped in beetles sampling and read, corrected, discussed and approved the final version of the paper.
Geraldine Roux-Morabito: is Assistant Professor at the University of Orléans and conducts her research at the INRA Orléans in the units of forest zoology. She led the project, supervised the word and participated in the sampling, in phylogenetic data analyses and in writing of the paper.
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Bertheau, C., Bankhead-Dronnet, S., Martin, C. et al. Lack of genetic differentiation after host range extension argues for the generalist nature of Pityogenes chalcographus (Curculionidae: Scolytinae). Annals of Forest Science 69, 313–323 (2012). https://doi.org/10.1007/s13595-011-0161-4
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DOI: https://doi.org/10.1007/s13595-011-0161-4