EFFECTS OF VERTICAL GRADIENT ON THE DIVERSITY AND ABUNDANCE OF NYMPHALIDAE IN A BORNEAN RAINFOREST
Abstract
The forest canopy is known to harbour high insect diversity, yet descriptive studies that simultaneously measure species richness on both ground and canopy strata are not common. The Nymphalidae are abundant in the canopy and their distribution across the vertical dimension contributes to tropical diversity. A comprehensive study of the vertical distribution of nymphalids in four forest habitats in the Kubah lowland mixed-dipterocarp forest: primary, secondary, heath forest and forest edge were conducted. Forty baited traps were installed at both ground and canopy levels and sampled over a six-month period. The preference of the nymphalids for the lower stratum was significant for abundance, diversity, and common species such as Bassarona dunya. Observed pattern could be due to the distribution of available adult resources and larval hostplants. Being practically ‘sun-lovers’, highest diversity of nymphalids at the canopy level was recorded at the forest edge (H’ = 2.525). Meanwhile, more microhabitats are offered at the lower level in secondary forest and thus supporting the most diverse nymphalids here (H’ = 3.020). Vertical study of nymphalids provides knowledge and fluctuation patterns of its diversity and thus more similar study is suggested to be conducted in the future.
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