Effects of landscape and management on ground‐dwelling insect assemblages of farmland in Jeju Island, Korea

Granite-derived soils are widespread in the farmland of Korea in general. In contrast, Jeju Island has mainly volcanic ash soils. Soils and weather condition in Jeju Island created a unique agricultural system. We identified the features of ground-dwelling insects in farmlands of Jeju Island. This study was conducted in four areas (Samdal-ri and Susan-ri in Seogwipo city, and Dongmyeong-ri and Suwon-ri in Jeju city) in Jeju Island, Korea. Field surveys were carried out twice in summer (June) and autumn (September) in 2013. Ground-dwelling insects were sampled quantitatively by using pitfall traps. As a result, in total 3322 individuals, 137 species, 48 families and 8 orders were investigated in farmlands of Jeju Island. Especially, members of Coleoptera and Hymenoptera accounted for a large proportion of ground-dwelling insect communities. The numbers of species and individuals for major taxonomic groups showed significant regional and seasonal differences. This study implied that the seasonal and regional differences of ground-dwelling insect communities were affected by surrounding land use patterns, life history patterns of each taxonomic group and farmland management.