| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Outline of Final Research Achievements |
Among 7 mangrove species in the Ryukyu Islands, Kandelia obovata and Avicennia marina trees showed the frequent damages by branch dieback diseases. Severe dieback symptoms distorting tree form were often observed on the branch located just over the water revel at a high tide on the adult edge trees of the both species. The affected trees of the both species also showed the twig damage in the upper part of their crown caused by a few weakly pathogenic fungi, including species known as tree endophytes. K. obovata and A. marina are known as a fringing mangrove component. The height of adult trees at the edge of the stands become smaller, and their crown develops in the flat, table-like form by the diseases and tides, which can promote their tolerance to the wind and wave power. The occurrence of branch and twig dieback on the edge tree of the mangrove stands can be one of the reason why K. obovata and A. marina are adapted to be fringing mangroves in the Ryukyu Islands.
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