Host preference of the tree‐killing bark beetle <i>Polygraphus proximus</i> across a geographic boundary separating host species

Takagi, Etsuro

doi:10.1111/eea.13229

Cited by 3 publications

(13 citation statements)

References 51 publications

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“…However, no positive correlation between host taxonomic proximity and host preference in P. proximus was observed in a previous study (Takagi, 2022). In contrast, this study showed that the relationship between taxonomic proximity and colonization success is complex.…”

Section: Discussioncontrasting

confidence: 98%

“…The results showed that the order of colonization success among the Abies species was not significantly different on either side of the Tsugaru Strait. These findings are consistent with those ofTakagi (2022) reporting that the Tsugaru Strait does not represent a geographic boundary of host preferences for P. proximus, indicating that host specialization has not occurred across the Tsugaru Strait.According to the PPH and a positive correlation between host preference and successful colonization (i.e., the preferencecolonization hypothesis) in bark beetles, the rates of successful colonization among the Abies species would be reflected by their host preference. Specifically, A. veitchii and A. firma were expected to exhibit the highest successful colonization rates, followed by A. homolepis and A. sachalinensis exhibiting the lowest rate.…”

supporting

confidence: 91%

“…This study demonstrated the colonization success of P. proximus within four Abies species across a distinct biogeographic boundary separating the Abies species in Japan (i.e., the Tsugaru Strait). In the Polygraphus proximus prefers A. firma logs on both sides of the Tsugaru Strait (Takagi, 2022). However, in the present study, the successful colonization rate of P. proximus in A. firma logs was the lowest, and P. proximus was killed by the resin in A. firma logs immediately after entry.…”

Section: Discussioncontrasting

confidence: 65%

“…All files related to this study are available from the DRYAD at https:// doi.org/10.5061/dryad.vq83b k3wh (Takagi, 2023).…”

Section: Co N Fli C T O F I Nte R E S T S Tate M E Ntmentioning

confidence: 99%

“…Therefore, this study aimed to determine the proportion of successful colonization of P. proximus across a biogeographic boundary in Japan, and whether a positive relationship was present between host preference, as shown in the previous study (Takagi, 2022), and colonization success.…”

mentioning

confidence: 92%

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Colonization success of a tree‐killing bark beetle: Geographic variation and mismatch with host preference

Takagi

2023

Ecology and Evolution

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The preference-performance hypothesis (PPH) predicts that female insects maximize their fitness by ovipositing on hosts where their offspring perform the best (Gripenberg et al., 2010;Mayhew, 2001;Thompson, 1988). A strong correlation between oviposition preference and offspring performance has been reported in multiple insect taxa (Gripenberg et al., 2010). In response to natural selection, adult female host preference and larval performance are adjusted to the local set of potential host plants that render the highest fitness in each population.Preference-performance relationships in bark beetles are complex because before offspring development can occur in the phloem, adult bark beetles must successfully invade host trees, then construct galleries beneath the bark (Eidson et al., 2018). Therefore, a positive correlation between host preference and successful

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Section: Discussioncontrasting

confidence: 98%

supporting

confidence: 91%

Section: Discussioncontrasting

confidence: 65%

“…All files related to this study are available from the DRYAD at https:// doi.org/10.5061/dryad.vq83b k3wh (Takagi, 2023).…”

Section: Co N Fli C T O F I Nte R E S T S Tate M E Ntmentioning

confidence: 99%

mentioning

confidence: 92%

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Colonization success of a tree‐killing bark beetle: Geographic variation and mismatch with host preference

Takagi

2023

Ecology and Evolution

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Reemergence and sister brood establishment in the bark beetle Polygraphus proximus (Coleoptera: Curculionidae: Scolytinae) under laboratory conditions

Takagi,

Yamanaka

2024

Appl Entomol Zool

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Reemergence and sister broods (second broods) are commonly observed in bark beetles (Coleoptera: Curculionidae: Scolytinae), particularly in species with male-initiated polygyny and female-initiated monogyny. Polygraphus proximus Blandford, a male-initiated monogynous bark beetle, is a quarantine species in the EU, which has been introduced from east Asia into both Siberia and central European Russia, causing mortality of trees across large areas of Abies sibirica forests. To clear whether P. proximus females reemerge to lay additional broods (sister broods), we observed the reproduction of reemerged females under laboratory conditions. We prepared 25 females reproducing in galleries collected by peeling the infested logs and 25 females reemerged from such logs. These females were put into the tubes vertically attached onto the surfaces of logs. Consequently, approximately 40% of both the reproducing females in galleries and the reemerged females bored into the logs and established sister broods without repeated mating. Moreover, 21% of these reproducing females established sister broods again using the same procedures, suggesting that the females can establish sister broods more than once. Our results indicated that the fecundity of P. proximus is higher than previously assumed, suggesting that its population levels can rapidly increase in weakened or dead trees, ultimately leading to the ability to attack healthy trees during the epidemic phase.

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Cutting into short logs reduces infestation by the bark beetle Polygraphus proximus

Takagi,

Aochi

2024

J Applied Entomology

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Polygraphus proximus Blandford (Coleoptera: Curculionidae: Scolytinae), a non‐aggressive bark beetle, has caused mortality of Abies spp. in Western Siberia, Central Asia, European Russia as well as Japan. Removing dead trees (e.g. salvage logging) and thinning stands are considered one of the best practices to reduce the risk of bark beetle outbreaks. However, salvaging or removing dead and thinned trees requires significant effort. Thus, to determine whether cutting trees into shorter logs would reduce P. proximus infestation, we exposed A. sachalinensis logs of various lengths on the ground in a forest stand. The attack density of P. proximus significantly decreased with shorter log lengths. It can be concluded that cutting into short logs and leaving them on the ground are effective practices to reduce the chance of P. proximus host location and outbreaks after natural disturbances and thinning.

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Host preference of the tree‐killing bark beetle Polygraphus proximus across a geographic boundary separating host species

Cited by 3 publications

References 51 publications

Colonization success of a tree‐killing bark beetle: Geographic variation and mismatch with host preference

Colonization success of a tree‐killing bark beetle: Geographic variation and mismatch with host preference

Reemergence and sister brood establishment in the bark beetle Polygraphus proximus (Coleoptera: Curculionidae: Scolytinae) under laboratory conditions

Cutting into short logs reduces infestation by the bark beetle Polygraphus proximus

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