Bioecological Studies of the Southern Coastal Area in Cheju Island -1. Distribution and Community Structure of the Benthic Macroinvertebrates in Gapa and Mara Islets -

제주도 남부연안역의 생물생태학적 기초연구 1.가피도와 마라도 조간대의 저서무척추동물의 분포와 군집구조

A study on the distribution and community structure of the benthic macroinvertebrates on the intertidal zones of Gapa and Mara islets were carried out from March to June 1991. The macroinvertebrates collected and identified were composed of 7 phyla, 14 classes, 29 orders, 68 families and 132 speies in Gapa islet and of 7 phyla, 12 classes, 23 orders, 49 familis and 90 species in Maara islet. The first and second dominant species and the community dominance indices of the upper tidal zones of Gapa and Mara islets were Nodilittorina exigua, Pollicipes mitella and 79.01, 69.77 respectively. However, the dominant species of the middle and lower intertidal zones of the two islets were not identities and different among the tidal zones.