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 (437KB)
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29,330,000 Yen (FY 1998; 9,650,000 Yen)
Number and species richness of the understory butterflies (Lepidoptera, Nymphalidae), flower visiting beetles, bees and soil micro arthropoda were compared between neighboring primary forest and secondary forest in the Pasoh Forest Reserve, Peninsular Malaysia. The secondary forest had been naturally regenerated after selective logging in the 1960s. It was found that butterfly fauna of the regenerated forest has not been recovered after about 30 years of natural regeneration. Number of the flower visiting beetles (Scarabaeidae and Mordellidae) does not seem to be different between natural and regenerated forests. To examine the seasonal variation and community structure of tropical pollinators, honey traps were set in every 10 m on a Pasho tower (50m in height) from 0 m to 40 m. Bee communiy structure was strongly influenced by the dipterocarp mass flowering which occured in 1996. Numbers of Collembola, Pseudscorpion and Schizomida were fewer in the oil palm and the rubber plantation than in the primary forest. Community structures of the oribatid mites were similar among study site except for oil palm plantation.
tropical forest, fragmentation, degradation, insect, species diversity