| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
Dipterocarp trees in Southeast Asia are known to flower and fruit every 2 to 10 years. In the present study, how insect seed predators on dipterocarps adapt to the largely fluctuated seed production of dipterocarps was examined. Molecular phylogeny of the seed weevils showed that closely-related weevils did not always use closely-related dipterocarp species. This implies that weevils might have altered or expanded their hosts to deal with the unpredictable seeding phenology. Also, there were two types of weevil larvae in seeds of dipterocarps; one emerged as adults soon after fruit-fall while the other remains as larvae more than one years. This implies that some larvae have dormancy to survive during non-fruiting period.
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