Comparative Insect Faunas between Ganghwado and Six others Islands of West Coastal in Incheon,Korea

This paper is intended as an investigation of the biogeographic characteristics of insect faunas of the seven islands in West Coastal of Incheon, Korea, using quantitative analysis. The faunal similarity is examined using the Bray & Curtis similarity. The obtained similarity value matrix was examined by a cluster analysis using UPGMA method. The number and the distribution records of each species in the areas are 1,001 species of insects belonging to 12 orders from the seven investigated islands. Among above seven islands, Seokmodo has the highest number of species, 497 species, while Yeonpyeongdo has the lowest, 136 species. The species composition of insects reported in Ganghwado was 309 species under seven orders. The similarity values between seven localities investigated range from 24.907(Gyodongdo to Yeonpyeongdo) to 49.899(Baengnyeongdo to Ganghwado). That is, the species composition of Baengnyeongdo(47.90%) was similar to that of Ganghwado, while that of Yeonpyeongdo(25.28%) was different from that. The cluster analysis using a similarity index shows that all the islands of these areas can be divided into 3 groups at the level of 30.97%.