The canopy structure and spatial distribution of flying insects in a riverside forest canopy were studied. Based on insect composition, the canopy was divided into four areas: upper open space of a canopy gap, inside the canopy, forest floor, and river surface. Thysanoptera were abundant in the upper open space, while Coleoptera were abundant near the forest floor. Insect composition was intermediate inside the canopy. The horizontal canopy structure affected insect distribution as did the vertical structure. The community at the river surface was rich in aquatic insects. However, the distribution of aquatic insects was limited only to the river surface.
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