Addressing a century-old hypothesis – do pioneer beetles of Ips typographus use volatile cues to find suitable host trees?

Global warming and more frequent climate extremes have caused bark beetle outbreaks of unprecedented scale of these insects in many conifer forests world-wide. Conifers that have been weakened by drought and heat or damaged by storms are highly susceptible to bark beetle infestation. A large proportion of trees with impaired defences provides good conditions for beetle population build-up of beetles, but mechanisms driving host search of pioneer beetles are still uncertain in several species, including the Eurasian spruce bark beetle Ips typographus. Despite a two-century-long history of bark beetle research, we still lack a sufficient understanding of interactions between I. typographus and its host Norway spruce (Picea abies) to forecast future disturbance regimes and forest dynamics. Depending on the scale (habitat or patch) and beetle population state (endemic or epidemic), host selection is likely driven by a combination of pre and postlanding cues, including visual selection or olfactory detection (kairomones). Here, we discuss primary attraction mechanisms and how volatile emission profiles of Norway spruce may provide cues on tree vitality and suitability for attacks by I. typographus, in particular during the endemic phase. We identify several crucial knowledge gaps and provide a research agenda addressing the experimental challenges of such investigations.

Kandasamy, DineshkumarLund University,Lunds universitet,Funktionell zoologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Feromongruppen,Forskargrupper vid Lunds universitet,Functional zoology,Department of Biology,Faculty of Science,Pheromone Group,Lund University Research Groups,Max Planck Center for next Generation Insect Chemical Ecology (nGICE)(Swepub:lu)di6675ka (författare)
Andersson, Martin N.Lund University,Lunds universitet,Funktionell zoologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Feromongruppen,Forskargrupper vid Lunds universitet,Functional zoology,Department of Biology,Faculty of Science,Pheromone Group,Lund University Research Groups,Max Planck Center for next Generation Insect Chemical Ecology (nGICE)(Swepub:lu)ekol-mta (författare)
Netherer, SigridUniversity of Natural Resources and Life Sciences, Vienna (författare)
Alves, Eliane GomesMax Planck Institute for Biogeochemistry (författare)
Huang, JianbeiMax Planck Institute for Biogeochemistry (författare)
Hartmann, HenrikJulius Kühn-Institute Federal Research Centre for Cultivated Plants,Max Planck Institute for Biogeochemistry (författare)
Max Planck Institute for BiogeochemistryFunktionell zoologi (creator_code:org_t)

Av författaren/redakt...: Lehmanski, Linda ...; Kandasamy, Dines ...; Andersson, Marti ...; Netherer, Sigrid; Alves, Eliane Go ...; Huang, Jianbei; visa fler...; Hartmann, Henrik; visa färre...

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