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2004 Fiscal Year Final Research Report Summary

Verification of top-down effects in the tropical forest ecosystems of South-eastern Asia

Research Project

Project/Area Number 13575006
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field 生態
Research InstitutionResearch Institute for Humanity and Nature (2003-2004)
Kyoto University (2001-2002)

Principal Investigator

YUMOTO Takakazu  Research Institute for Humanity and Nature, Professor, 研究部, 教授 (70192804)

Co-Investigator(Kenkyū-buntansha) MARUHASHI Tamaki  Musashi University, Faculty of Humanities, Professor, 人文学部, 教授 (20190564)
NOMA Naohiko  University of Shiga Prefecture, Lecturer, 環境科学部, 講師 (80305557)
Project Period (FY) 2001 – 2004
Keywordsfrugivory / fruit characteristics / hornbill / population fluctuation / seed dispersal / seed predation / small mammals / tropical forest
Research Abstract

1) Fruit consumption on the canopy by 4 species of hornbills, white-handed gibbons, pig-tail monkeys and other frugivores was observed to reveal the relationships between fruit consumers and fruit characteristics in Khao Yai National Park, Thailand, a moist tropical forest Among 259 plant species, plants having a large and lipid-rich fruit with 1-seed were observed to be consumed and be dispersed only by hornbills. So these plants can be called "hornbill dispersed plants". White-handed gibbons preferred sugar-rich fruits, and pig-tailed monkeys often ate unripen fruits and acted mainly as seed predators. 2) Seeds and seedlings dispersed around nest trees of hornbills were marked and monitored during 3 years. Most of seedlings near nest trees disappeared during 3 year, however, some seedlings of "hornbill dispersed plants" had survived. Seedling s were suffered by heavy seed predation, which caused by small mammals attracted by a high density of seeds and seedlings around nest trees. 3) Fruit consumption on the ground was studied by camera trapping, and population fluctuation of small mammals, Maxomys surifer and Niniventer bukit was monitored during 3 years by capture-recapture method. The biomass of two main seed predators, M. surifer and N. bukit (2150 g/ha) was twice and three times as high as rodents recorded in other tropical forests (e.g. 616 g/ha in Huai Kha Khaeng). These two species of rodents showed highest population density in the middle of dry period. But the breeding season of two rodents differed, which suggested some relationships of food fruit/seed of them. 4) In conclusion, the seeds and seedlings in the forests where hornbills are extinct will be suffered by heavier seed predation caused by heavier accumulation of seeds around mother trees, so that the regeneration of trees will become difficult at least for some tree species.

  • Research Products

    (11 results)

All 2004 2002 Other

All Journal Article (11 results)

  • [Journal Article] Dispersal of Aglaia apectabilis. A large-seeded tree species in moist evergeen forest in Thailand2004

    • Author(s)
      Kitamura S, Suzuki S, Yumoto T, Poonswad P, et al.
    • Journal Title

      Journal of Tropical Ecology 20

      Pages: 421-427

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Pattern and impact of hornbill seed dispersal at nest trees in a moist ever green forest in Thailand2004

    • Author(s)
      Kitamura S, Suzuki S, Yumoto T, Poonswad P, et al.
    • Journal Title

      Journal of Tropical Ecology 20

      Pages: 545-553

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Dispersal of Aglaia apectabilis: A large-seeded tree species in a moist evergreen forest in Thailand.2004

    • Author(s)
      Kitamura, S., Suzuki, S., Yumoto, T., Poonswad, P., P.Chuailua, Plongmai, K., Noma, N., Maruhashi, T., Suckasam, C.
    • Journal Title

      Journal of Tropical Ecology 20

      Pages: 421-427

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Pattern and impact of hornbill seed dispersal at nest trees in a moist evergreen forest in Thailand.2004

    • Author(s)
      Kitamura, S., Yumoto, T., Poonswad, P., Noma, N., Chuailua, Plongmai, K., Maruhashi, T., Suckasam, C.
    • Journal Title

      Journal of Tropical Ecology P. 20

      Pages: 545-553

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Interactions between fleshy fruits and frugivores in a tropical seasonal forest in Thailand2002

    • Author(s)
      Kitamura S, Yumoto T, Poonswad, Maruhashi T, Noma N.
    • Journal Title

      Oecologia 133

      Pages: 559-572

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 熱帯林の霊長類研究のためのハンドブック 2. 植生調査と植物標本の処理2002

    • Author(s)
      湯本貴和
    • Journal Title

      霊長類研究 18(3)

      Pages: 284-289

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Interactions between fleshy fruits and frugivores in a tropical seasonal forest in Thailand.2002

    • Author(s)
      Kitamura, S., Yumoto, T., Poonswad, P., Chuailua, P., Plongmai, K., Maruhashi, Y., Noma, N.
    • Journal Title

      Oecologia 133

      Pages: 559-572

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Characteristics of hornbill-dispersed fruits in a tropical seasonal forest in Thailand

    • Author(s)
      Kitamura S, Yumoto T, Poonswad P, et al.
    • Journal Title

      Bird Conservation International (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A botanical inventory of a tropical seasonal forest in Khao Yai National Park. Thailand : implications for fruit-frugivore

    • Author(s)
      Kitamura S, Suzuki S, Yumoto T, et al.
    • Journal Title

      Biodiversity and Conservation (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Characteristics of hornbill-dispersed fruits in a moist seasonal forest in Thailand.

    • Author(s)
      Kitamura, S., Yumoto, T., Poonswad, P., P.Chuailua, Plongmai, K.
    • Journal Title

      Bird Conservation International (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A botanical inventory of a tropical seasonal forest in Khao Yai National Park, Thailand : implications for fruit-frugivore.

    • Author(s)
      Kitamura, S., Yumoto, T., Poonswad, P., P.Chuailua, Plongmai, K.
    • Journal Title

      Biodiversity and Conservation (in press)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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