Inhibition of seed dispersal by indirect effects of fruit- and seed-feeding insects

• Project/Area Number: 26850094
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Forest science
• Research Institution: Tokyo Metropolitan University (2016); University of Tsukuba (2014-2015)
• Principal Investigator: Takagi Etsuro 首都大学東京, 都市環境科学研究科, 助教 (60718675)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 生物間相互作用 / 間接相互作用 / モチノキ / モチノキタネオナガコバチ / ニホンオナガコバチ / クロガネモチ / 種子食性昆虫 / 果実食性昆虫 / 形質媒介間接効果 / 果肉食性昆虫 / 果実食性鳥類

Outline of Final Research Achievements

To demonstrate the inhibition of seed dispersal by frugivorous birds via trait-mediated indirect effects of fruit- and seed-feeding insects, fruit sampling and estimation of fruit amount were conducted from 2014 to 2016. To reveal trait-mediated indirect effects of fruit- and seed-feeding insects which are closely related to the study species and inhabit in other forest ecosystems, field surveys and experiments were also conducted.
I revealed the following phenomenon: 1) Macrodasyceras japonicum, which is the closely related wasp to M. hirsutum, infested the novel host tree species Ilex serrata, which is the closely related tree to I. integra, and 2) it is suggested that number of total and sound nuts of Fagus crenata could be estimated by the amount of male inflorescences captured in a few traps until summer; therefore, emergences of Japanese black bear might be predicted with less effort. On the other hands, further studies about species interactions related to I. integra were needed.

Research Products

• [Journal Article] Potential impact of an exotic plant invasion on both plant and arthropod communities in a semi-natural grassland on Sugadaira montane in Japan (2017)
  • Author(s): Sato, Y., Mashimo, Y., Suzuki, R.O., Hirao, A.S., Takagi, E., Kanai, R., Masaki, D., Sato, M. & Machida, R.
  • Journal Title: Journal of Developments in Sustainable Agriculture Volume: 印刷中
  • NAID: 130005681162
  • Peer Reviewed
• [Journal Article] 野生哺乳動物の餌としてのブナの堅果量推定ー長野県上田市菅平高原の小規模ブナ天然林におけるブナ結実状況 (2017)
  • Author(s): 正木大祐，長岡講二，高木悦郎
  • Journal Title: 環動昆 Volume: 印刷中
  • NAID: 130006302318
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Pests of the endangered herb Platycodon grandiflorus in central Japan (2016)
  • Author(s): Takagi, E.
  • Journal Title: Journal of the Entomological Research Society Volume: 18 Pages: 1-5
  • Peer Reviewed / Open Access
• [Journal Article] New host records of Macrodasyceras japonicum (Ashmead, 1904) (Hymenoptera, Torymidae), with notes of its morphology (2016)
  • Author(s): Matsuo, K. & Takagi, E.
  • Journal Title: Japanese Journal of Systematic Entomology Volume: 22 Pages: 175-178
  • NAID: 40022586264
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] New distribution record of Reticulitermes speratus Kolbe (Isoptera: Rhinotermitidae) in the coldest highland in central Japan (2015)
  • Author(s): Takagi, E. & Ogai, T.
  • Journal Title: Sociobiology Volume: 62 Issue: 3 Pages: 460-461
  • DOI: 10.13102/sociobiology.v62i3.595
  • NAID: 120007130044
  • Peer Reviewed / Open Access
• [Journal Article] Herbivory by Strongylocoris leucocephalus (Hemiptera: Miridae) on a novel host plant Adenophora triphylla var. japonica in Japan. (2014)
  • Author(s): Takagi, E.
  • Journal Title: Journal of Asia-Pacific Entomology Volume: 17 Issue: 3 Pages: 499-503
  • DOI: 10.1016/j.aspen.2014.04.010
  • Peer Reviewed / Open Access
• [Remarks]
  • URL: http://etsurotakagi.jimdo.com/