| Budget Amount *help |
¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
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| Outline of Final Research Achievements |
Although natural hybridisation between dipterocarp trees is considered rare, we found many putative dipterocarp hybrids (genus Shorea spp.) in a forest fragment in Singapore. We analysed seedling survival and growth rates in relation to environmental variables for S. curtisii, S. leprosula and hybrids of the two species. Hybrids were more frequent at the seedling stage than at the mature stage. F1 individuals had growth and survival rates comparable to their parent species, with the exception of higher growth rates in S. leprosula. Our results showed that hybrid F1 seedlings lacked obvious heterosis, and might therefore have similar fitness to that of parent species for the present forest environment. We also found more frequent interspecific hybridization in fragmented forests than non-disturbed forests with large area. This indicates that forest fragmentation may accelerate hybridization between dipterocarps tree species.
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