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- 저자 : Takagi Etsuro (검색결과 3 건)
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Etsuro Takagi 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
When monophagous and oligophagous insect herbivores colonize new areas, they sometimes use novel hosts. The availability of the new hosts can facilitate further expansion into regions beyond the geographic range ofthe original hosts, resulting in specialization on different host plant taxa in different parts of the herbivore'sgeographic range. Strongylocoris leucocephalus Linnaeus (Hemiptera: Miridae), which is a plant bug attackingCampanula spp., is widely distributed in the Eurasian continent, North Africa, and northern Japan. In the processof geographic range expansion, S. leucocephalus may incorporate novel host plants into their host range. I investigatedthe host plant species of S. leucocephalus in central Japan. Field observations revealed that the plant bugfed on the novel host plant Adenophora triphylla (Thunb.) A. DC. var. japonica (Regel) H. Hara (Campanulaceae),although feeding by S. leucocephalus was not associated with plant mortality. However, S. leucocephalus never fedon Campanula punctata Lam. var. hondoensis (Kitam.) Ohwi, the only Campanula species at the study site. Theplant bug S. leucocephalus and the novel host plant A. triphylla var. japonica are not entirely distributed sympatrically,suggesting that the plant bug has expanded its geographic range by incorporating new hosts.
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Köbayashi Kenta,Iguchi Kazunobu,Takagi Etsuro 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
Polygraphus proximus Blandford (Coleoptera: Curculionidae: Scolytinae) is a non-aggressive monogynous bark beetle that has caused mass mortality in fir (Abies spp.) forests in the last decade. Although gallery structures made by polygynous beetles may influence their reproductive success, the gallery structure and the number of eggs laid by the monogynous tree-killing bark beetle P. proximus has not been investigated in detail in the natural setting of their native range. We, therefore, investigated the length of mother galleries of P. proximus and the number of eggs oviposited by the beetles in relation to gallery systems with different numbers of arms. The number of eggs oviposited in two-armed galleries was significantly greater than that observed in one- and threearmed galleries. Additionally, the length of one- or two-armed galleries with no oviposition was significantly shorter than that in galleries consisting of more than two arms. Our data may suggest that the optimal number of arms in a gallery system (in terms of the number of eggs oviposited) was two.
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Köbayashi Kenta,Iguchi Kazunobu,Takagi Etsuro 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2
Polygraphus proximus Blandford (Coleoptera: Curculionidae: Scolytinae) is a non-aggressive monogynous bark beetle that has caused mass mortality in fir (Abies spp.) forests in the last decade. Although gallery structures made by polygynous beetles may influence their reproductive success, the gallery structure and the number of eggs laid by the monogynous tree-killing bark beetle P. proximus has not been investigated in detail in the natural setting of their native range. We, therefore, investigated the length of mother galleries of P. proximus and the number of eggs oviposited by the beetles in relation to gallery systems with different numbers of arms. The number of eggs oviposited in two-armed galleries was significantly greater than that observed in one- and threearmed galleries. Additionally, the length of one- or two-armed galleries with no oviposition was significantly shorter than that in galleries consisting of more than two arms. Our data may suggest that the optimal number of arms in a gallery system (in terms of the number of eggs oviposited) was two.
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