ISSN : 1225-3480
제주도 문섬 주변해역에서 2007년 6월부터 12월까지 해양환경특성 및 저서 무척추동물의 군집구조를 파악하기 위해 조사 하였다. 평균 수온과 염분은 각각 <TEX>$19.6^{\circ}C$</TEX>, 34.03 psu로써 비교적 안정된 수괴를 형성하고 있었다. DO는 6.42-8.14 mg/L(평균 7.37 mg/L), COD는 0.27-0.64 mg/L(평균 0.44 mg/L), SPM은 1.98-6.86 mg/L(평균 3.07 mg/L)의 범위를 나타내어 환경기준 중 해역환경 I 등급 이내의 양호한 환경을 나타냈다. 식물플랑크톤 chlorophyll a량의 분포는 0.40-1.09 mg/L(평균 0.69 mg/L)의 범위로써 6월에 비해 12월에 높게 나타났다. 영양염류의 평균 농도는 DTN의 경우 0.073-0.264 mg/L(평균 0.15 mg/L), DTP의 경우 0.004-0.011 mg/L(평균 0.01 mg/L), <TEX>$SiO_2$</TEX>의 경우 0.039-0.464 mg/L(평균 0.23 mg/L)의 범위로 육상 유입에 의해 문섬 주변에서의 농도 변화가 높게 나타났다. 조사기간 중 총 112 종의 저서동물이 채집되었는데, 연체동물이 40 종(36.0%)이였으며, 이 중 복족류가 19.8%로 가장 우점하였고, 자포동물은 33 종(28.8%), 해면동물은 13 종(11.7%), 절지동물은 8 종(7.2%)이 나타났고, 기타 동물은 17 종(15.3%)으로 조사되었다. 조사해역의 개체 밀도와 생물량은 각각 4,340 개체/<TEX>$m^2$</TEX>, <TEX>$53,107.8\;gwwt/m^2$</TEX>로 자포동물 중 산호충류가 개체수와 생체량에서 우점하였다. 주요 우점종은 Dendronephthya gigantea, Scleronephthya gracillimum, Anthoplexaura dimorpha, Dendronephthya castanea, Thecocarpus niger, Dendronephthya spinulosa, Dendronephthya putteri, Acabaria bicolor로 주로 산호충류에서 높은 우점율을 나타냈다. 계절별 출현양상의 경우 자포동물 및 연체동물의 하계에 개체수 및 생체량이 증가하다 동계로 갈수록 높아지는 경향을 보였다. 정점별 종다양도(H'), 균등도(E') 및 풍부도(R) 지수의 범위는 각각 2.715-3.413, 0.758-0.851, 5.202-8.720 로 M1에서 가장 낮았고, M2에서 높게 나타났다.
This study was performed to know the community structure of macrobenthos and environmental factors at each 4 stations and 9 stations around Munseom coastal water in Jeju Island from June to December, 2007. Mean temperature and mean salinity were 19.6℃, 34.03 psu which shows stable water masses. Concentrations of DO, COD and SS were as low as those in the standard sea-water-quality classes I. Chlorophyll a concentrations of phytoplankton ranged from 0.40 to 1.09 mg/l (0.69 mg/l), showing higher December than June with a blooming in winter. The mean concentration values (the ranges in parentheses) of nitrate, phosphate, and silicate were 0.07-0.26 mg/l (0.15 mg/l), 0.04-0.01 mg/l (0.01 mg/l), 0.01-0.46 mg/l (0.23 mg/l), respectively. However, the values higher near the Munseom due to influxes from the land. A total of 112 species was identified. of these mollusca comprised 40 species (36.0%); Cnidaria 33 (28.8%); Porifera 13 (11.7%); arthropoda 8 (7.2%) and others including Echinodermata, 17 (15.3%). density and biomass were estimated to be 4,340 individual/㎡ and 53,107.8 gwwt/m², respectively. Anthozoa were the most dominant faunal group in terms of abundance (2,132 individual/m²) and number of species as well, whereas Cnidaria was predominant in biomass (37,630.9 gwwt/m²). The dominant species were Dendronephthya gigantea, Scleronephthya gracillimum, Anthoplexaura dimorpha, Dendronephthya castanea, Thecocarpus niger, Dendronephthya spinulosa, Dendronephthya putteri, Acabaria bicolor in 10-30 m. The seasonal variation of the number of individual and biomass Cnidaria and Mollusca was observed. There was a slow increase in June, a decrease in October, and a highest increase in December. The biodiversity, evenness richness index were appeared 2.715-3.413 (H'), 0.758-0.851(E'), 5.202-8.720 (R) in each stations. The dominace index were appeared highest in M2 and lowest in M1.
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