ISSN : 1225-3480
남해안 내만해역에서 인공부착판 투입시기와 투입기간에 따른 군집구조의 차이를 보고자 하였다. 거제도 장목만에서2007년 3월에서 10월에 이르는 기간 동안 매월 PVC 재질의인공부착판을 수심 50 cm에 수직방향으로 투입하였다. 2007년 11월에 저서동물이 부착된 PVC판을 회수하여 부착생물군집을 조사한 결과 지중해담치는 3월에서 7월에 투입된 부착판에서 우점종으로 출현하였고, 석회관갯지렁이와 주름멍게는 5월 이후 10월까지 투입한 부착판에서 우점종으로 남았다. 주걱따개비와 다발이끼벌레류는 6월-9월 사이에 투입한 부착판에서 우점하였다. 실험종료 시에 회수한 부착판에서의 분류군별 개체수와 습중량은 지중해담치의 우점으로 3월-7월 사이에투입된 부착판에서 최대치를 보였다. 종간 경쟁으로 인하여 최대가입시기와 우점시기가 일치하지 않은 부착생물들이 나타났고, 투입기간과 생물량이나 개체수 간에는 가입시기의 차이로인하여 뚜렷한 관련성을 보이지 않았다. 투입시기별 및 투입기간별로 특정 저서생물이 우점종으로 출현하였는데, 이는 유생공급을 결정하는 가입시기와 나중에 유입되는 유생을 배제하는 종간경쟁에 의해 최종 부착생물군집의 조성에 중요한 결정요인이 되는 것으로 나타났다.
This study was conducted to compare the species composition of sessile organisms on the artificial substrates of PVC submerged at different time intervals and duration in Jangmok Bay, Geoje Island, southern coast of Korea. Three PVC plates were submerged at one month interval from March to October and retrieved in November, 2007. A mussel, Mytilus galloprovincialis exclusively occupied the artificial substrates submerged from March to April and occurred as a dominant species to July. An ascidian, Styela plicata occurred as a dominant sessile species from May to August. Balanus amphtrite, Bugula sp., and hydrozoans occurred as dominant species on the plates submerged from July to September. There was a mis-match between the peak time of settlement and dominance of sessile organisms due to the interspecies competitions when the PVC plates were retrieved in November. There was no clear relationship between submerged duration and the abundance of sessile organisms due to the different settlement period. M. galloprovincialis seemed to be a strong competitor which could exclude the previous recruiters of macroalgae by overgrowth and occupy the substrate surface and maintain its high population density by preventing the settlement of other species until late autumn. These results suggested that the composition of sessile organisms in vacant hard substrates could be determined by the combined effects of supply-timing of larvae and post-settlement competitions.
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