Changes in dipteran assemblages with secondary succession of temperate deciduous forests following clear-cutting

摘要

We investigated the dipteran assemblages from April to November collected by Malaise traps set in temperate deciduous forests in the northern region of Ibaraki Prefecture, central Japan. The number of species and individuals of brachyceran Diptera (excluding the Calyptrata) from six sites were tabulated and compared among the old-growth natural forest (1 stand), 5-70 year-old secondary forests regenerated following clear-cutting (4 stands), and the 57 year-old mixed forests (1 stand). Results indicate that species richness and species composition of brachyceran Diptera varied with forest ages. The family Tephritidae, the genus Suillia (Heleomyzidae), the families Syrphidae, Clusiidae, Xylomyiidae, Xylophagidae, and Pipunculidae representing phytophages, mycetophages, saprophages, predators and parasitoids, exhibited different responses in species richness and species composition to changes of forest types. The Empididae, Syrphidae, and Lauxaniidae are most abundant in species and individuals among 41 families collected in the Malaise traps. The species composition of the Syrphidae distinctively differs among forest types (i.e., young secondary forests, mixed forest, and old forest) and is thus useful in assessing the diversity of such habitats.