A 20-Year Monitoring Study in an Endemic Forest in the Bonin Islands

Y. Shimizu

Komazawa University, Tokyo, Japan

A permanent quadrat (30 m x 30 m) was set in an endemic forest in the Bonin Islands in 1976 to study population dynamics and regeneration mechanism of the climax forest. All individuals belonging to 5 height categories were surveyed repeatedly in 1976, 1986 and 1996. A severe drought hit the Islands in 1980, a large typhoon gave much damage on the forest in 1983, a kind of moth ate most of leaves of Pouteria obovata in 1984 and 1993, and dry climate continued from 1990 to 1996. These disturbances and drier climate than usual made some endemic species, most of which are endangered, decrease the number of individuals, so the species diversity of the forest is decreasing during the recent 20 years.


Abstract from: XIX Pacific Science Congress, July 4-9, 1999, Sydney, Australia.

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Last Updated: 11/26/99