いかにして熱帯林の林冠部での甲虫類の活動を探るか : 半島マレーシア・パソーでの試み How to study the canopy beetles in a tropical rain forest. -Research trial in the Pasoh Forest Reserve, Peninsular Malaysia

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Though pollinating and wood boring insects play important roles in regeneration and decomposition processes in tropical rain forests, many such insects inhabit the forest canopy. Many methods such as chemical fogging, climbing techniques and large towers or cranes have been used to study canopy insects. A giant balloon air ship to bring researchers on a flexible raft up to the forest canopy was developed by Hallé. However, each method has disadvantages. Tree climbing methods are dangerous and require climbing skills. Building a tower or crane in a tropical forest is costly, disturbs the forest ecosystem and limits the research area. Chemical fogging is inadequate for determining the vertical distribution of insects and also disturbs the natural environment. Hallé's air ship system is expensive and requires a large number of staff. Therefore an inexpensive and movable balloon system in combination with attractant traps was developed and the effectiveness of the system was examined in a lowland tropical rain forest canopy in Pasoh Forest Reserve, Peninsular Malaysia. The balloons, 2.5 m in diameter, were filled with helium gas for levitation and moored in different directions by three pieces of thin rope. Traps with benzyl acetate and ethanol used as attractants for the pollinators and wood borers respectively were suspended from the balloon at different heights. The balloon system remained effective throughout the ten days that it was in use. The traps yielded beetles from thirteen families, but the dominant flower visiting genera attracted to benzyl acetate were Dasyvalgus, Mecinonota (Scarabaeidae) and Endaeus (Curculionidae), while the dominant wood borer attracted to ethanol was Xylosandrus crassiusculus (Scolytidae). A much larger number of individuals were trapped at 15 m ht. than at 1.5 and 7 m ht., particularly in Dasyvalgus sp.l. The trapping results show that the balloon system can be used for studying canopy insects, especially coleopteran pollinators, and their vertical distribution on a spatial and temporal scale. The vertical distribution pattern obtained by trapping

収録刊行物

  • Tropics

    Tropics 4(4), 317-326, 1995-05-30

    JAPAN SOCIETY OF TROPICAL ECOLOGY

参考文献:  18件中 1-18件 を表示

被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    10012397785
  • NII書誌ID(NCID)
    AN10528811
  • 本文言語コード
    JPN
  • 資料種別
    SHO
  • ISSN
    0917415X
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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