Bioindication or biomonitoring can be considered a type of applied ecology. Its primary goal is to use organisms living within natural communities to monitor the impact of disturbance and to use this knowledge in the management of the ecological system. An indicator taxon is one that is of narrow amplitude with respect to one or more environmental factors. When the species is present, it indicates the presence of certain environmental parameters. It Introduces the categories of indicators and introduces representative indicator insect species(e.g., butterflies, Carabid species).

An insect faunal survey was carried out to investigate insect community structure along the vegetation community to monitor insect species in forest ecosystem. We performed day and night collections from June to August along three vegetation communities of Is. Nam-hae in 2014: the first stand with Pinus thunbergii, the second P. thunbergii with Quercus serrata and the third P. thunbergii with various Quercus species. In total 2,259 individuals of 532 species, 99 families, 13 orders are identified. Cluster Analyses (CA) showed that all three vegetation communities were relatively similar between vegetation community types. According to indicator species analysis (ISA) result, nine significant indicator species were identified (p < 0.05); five species were found to be affected by the vegetation cluster and four species the month cluster.