A Study of Arthropod Fauna (Amphipods) in the Intertidal Zone of Hallyeohaesang National Park, South Korea

In this study, we surveyed the intertidal zones of Hallyeohaesang National Park to study amphipod fauna in relation to habitats. The survey was conducted four times between July 2019 and September 2020 at 20 stations in the Hallyeohaesang National Park. A total of 101 species belonging to 29 families belonging within one order were identified. The mean density of amphi- pods across all stations was 843.99 inds/㎡. The dominant and subdominant species are Protohyale (Boreohyale) triangulata (Hiwatari, 2003) and Abludomelita japonica (Nagata, 1965), respectively. In the ecological analysis of the communities in the study area, the dominance index was 0.21, diversity index was 3.24, richness was 14.84, respectively. Cluster analysis based on the am- phipod community of Hallyeohaesang National Park divided the 20 study stations into two groups according to the characteristics of the substrate and geographical distribution. The first group of stations (I) was characterized by a soft substrate dominated by mud and located in the inner bay. Group (II) was characterized by a hard substrate or mixed substrate located in the outer sea. These two groups of stations were further divided into three subgroups according to their substrate characteristics and geographical distribution.