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Pyrrhic victory for bark beetles: Successful standing tree colonization triggers strong intraspecific competition for offspring of Ips sexdentatus

hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
dc.contributor.authorPINEAU, Xavier
hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
hal.structure.identifierUniversité d'Orléans [UO]
dc.contributor.authorBOURGUIGNON, M.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorJACTEL, Herve
hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
dc.contributor.authorLIEUTIER, François
hal.structure.identifierLaboratoire de Biologie des Ligneux et des Grandes Cultures [LBLGC]
hal.structure.identifierUniversité d'Orléans [UO]
dc.contributor.authorSALLÉ, A.
dc.date.issued2017
dc.identifier.issn0378-1127
dc.description.abstractEnMost bark beetles living on standing trees must overcome the natural resistance of their host to succeed in colonization. For this they perform mass attacks to reach a critical threshold of attack density (CTAD) above which host defences are exhausted. However, this strategy can result in an intense intraspecific competition during larval development. Consequently, the ability of a bark beetle species to sustain outbreaks on standing trees would be conditioned by three key factors: the value of CTAD; the ability of attacking beetles to stop accumulating after CTAD has been reached; and the ability of offspring to tolerate intraspecific competition. To test these hypotheses, we assessed attack and colonization densities of Ips sexdentatus during an outbreak, and estimated CTAD, using a stand-scale approach, in nine maritime pine stands. We also estimated the effect of intraspecific competition on the productivity and fitness of I. sexdentatus offspring, testing increasing rearing densities in the laboratory. The overall CTAD of I. sexdentatus on standing maritime pines was 142 attacks/m2. CTAD varied among stands and ranged from 53 to 177 attacks/m2. In several stands, attack densities raised much above local CTAD. Ips sexdentatus exhibited a low tolerance to intraspecific competition. The number of offspring per female and the fitness of emerging adults decreased exponentially with increasing rearing density. Excessive attack densities and negative feedback on offspring quantity and quality are likely to trigger rapid collapse of outbreaks. This supports the prediction that I. sexdentatus is an opportunistically aggressive species.
dc.language.isoen
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by-sa/
dc.subjectcolonisation
dc.subjectdensité d'attaque
dc.subjectpinus pinaster
dc.subjectcoleoptera
dc.subject.enbrood productivity
dc.subject.encritical threshold of attack densities
dc.subject.enfitness
dc.subject.enmaritime pine
dc.subject.enchafers
dc.title.enPyrrhic victory for bark beetles: Successful standing tree colonization triggers strong intraspecific competition for offspring of Ips sexdentatus
dc.typeArticle de revue
dc.identifier.doi10.1016/j.foreco.2017.05.044
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalForest Ecology and Management
bordeaux.page188-196
bordeaux.volume399
bordeaux.peerReviewedoui
hal.identifierhal-01607802
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01607802v1
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