Comparison of Occurrences of Coleoptera by Three Sampling Methods in Mt. Yeonyeop Area, Korea

To compare the occurrence of Coleoptera by different sampling methods such as light trap, pitfall trap and sweeping, we collected samples every month from April to September,2004 in the Mt. Yeonyeop, Gangwon-do, Korea. According to the sampling methods, the species composition, abundance and dry weight were completely different. We collected 151 species in 35 families (690 individuals) by sweeping method, 148 species in 30 families (689 individuals) by light trap, and 112 species in 18 families (1,674 individuals) by pitfall trap, respectively. The dry weight in collected sample was about 181.46 g in pitfall trap,39.85 g in light trap, and 10.89 g in sweeping method, respectively. Relatively high flight and small-sized beetles such as Coccinellidae, Nitidulidae, Scarabaeidae were collected in light trap. The species diversity was high in July. Unlike the samples collected in light trap, the pitfall trap samples were big-sized saprophagous or carnivorous beetles such as Carabidae, Silphidae, Staphylinidae. The pitfall trap showed relatively the higher number of individual and lower species diversity compared to other methods. The major samples collected by sweeping method were small-sized carnivorous or herbivorous beetles such as Chrysomelidae, Curculionidae, Coccinellidae. The peak of species diversity occurred in May. The similarity was calculated with the Jaccard's index over the light trap-pitfall trap was 0.07, light trap-sweeping was 0.10, and pitfall trap-sweeping was 0.01. Consequently, similarity of sampling methods was relatively low. In conclusion, efficiency of the each sampling methods significantly differed in the species composition of Coleoptera. This study emphasize the necessity of using three sampling methods in the area of diversity research.

채집법에 따른 연엽산 일대 딱정벌레목의 출현상 비교 분석

2004년 4월부터 9월까지 총 6개월 동안, 강원대학교 학술림내 연엽산 일대의 딱정벌레목의 출현상을 채집방법에 따라 조사하여 비교하였다. Sweeping에 총35과 151종 690개체가 나타났고, light trap에 30과 148종 689개체가 출현하였으며, 그리고 pitfall trap에는 총18과 112종 1674개체가 채집되었다. 채집방법별 건중량은 pitfall trap (181.46 g), light trap (39.85 g), 그리고 sweeping (10.89 g)의 순으로 나타났다. Light trap으로는 크기가 작고, 비행성이 강한 Coccinellidae, Nitidulidae, Scarabaeidae 등이 주로 출현하였으며, 7월에 종수가 가장 많았다. 또한 pitfall trap의 경우, 크기가 크고, 육식성 또는 부식성인 Carabidae, Silphidae, Staphylinidae종류가 많이 출현하였다. 특히 가장 많은 개체수가 채집되었지만, 종수는 상대적으로 적었다. 그리고 sweeping의 경우 식식성이거나 미소 곤충을 포식하는 작은 크기의 Chrysomelidae, Curculionidae, Coccinellidae등이 많이 출현하였고,5월에 종수가 가장 많았다. 채집방법간 유사도 분석 결과, Jaccard's index의 값이 light trap-pitfall trap에서 0.07, light trap-sweeping에서 0.10,그리고 pitfall trap-sweeping에서 0.01로 상관성이 매우 낮은 것으로 나타났다. 결론적으로 각 채집방법에 따른 효과는 모두 달랐으며, 다양성 연구 시 세 가지 방법 모두를 사용하는 것이 타당하다고 본다.