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[E-2.3 Diversity of Interactions between Plants and Animals]

[Contact Person]

Naoki Kachi
Associate Professor
Department of Biology, Faculty of Science
Tokyo Metropolitan University
1-1 Minami-Ohsawa, Hachioji, Tokyo 192-03 Japan
Phone +81-426-77-2584 Fax +81-426-77-2559
E-mail kachi-naoki@c.metro-u.ac.jp

[Total Budget for FY1993-1995]

24,178,000 Yen (FY1995 7,722,000 Yen)

[Abstract]

　To identify fine scale functional differences among dipterocarp species in a tropical primary forest, seedling growth and survival in a forest gap were compared between Shorea leprosula and Neobalanocarpus heimii. In the gap, Shorea showed more enhanced growth and higher leaf turnover. Under the closed canopy, the survival rate was lower in Shorea. Regeneration of Shorea will be successful where gap formation is relatively frequent, while Neobalanocarpus may regenerate at places with infrequent gap formation. Three analyses of species diversity in a lowland dipterocarp forest were conducted to determine the nature of forest community dynamics with the data set obtained in a 50 ha plot in Pasoh Forest Reserve. Of the selected species for the analyses(444 species in total), 48 showed positive correlation with the distance from a conspecific adult. 35 species out of all those selected had their saplings clumped, while the adults were regularly or randomly distributed. As a group, the recruitment of saplings of species in the emergent or canopy layers increased significantly in proportion with mortality. This trend was not so apparent in the lower layers.

[Key Words]

Phenology, Plant-animal interaction, Regeneration, Seedling Establishment, Spetial Distribution, Tropical Rain Forest