Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Study of the Food Characteristics on Pacific Oyster Crassostrea gigas and Manila Clam Ruditapes phillippinarum in the Intertidal Zone of Taeahn, Korea

태안 조간대에 서식하는 참굴과 바지락의 먹이특성에 관한 연구

  • Baek, Seung-Ho (Department of Life Science, College of Natural Sciences, Hanyang University) ;
  • Lee, Ju-Yun (Department of Life Science, College of Natural Sciences, Hanyang University) ;
  • Lee, Hea-Ok (Department of Life Science, College of Natural Sciences, Hanyang University) ;
  • Han, Myung-Soo (Department of Life Science, College of Natural Sciences, Hanyang University)
  • Published : 2008.08.31
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Abstract

To assess the source of oyster (Crassostrea gigas) and clam (Ruditapes phillippinarum), phytoplankton community structures in the water column and sediment, including the composition of phytoplankton in oyster and clam digestive organs were investigated bimonthly from December 2006 to June 2007 in the Taeahn coastal waters. During the sampling period, water temperature and salinity varied from 7 to 23$^{\circ}C$ and 34 to 35 PSU, respectively. Total phytoplankton abundances at St. O in the water column were higher than those at St. J, whereas total phytoplankton abundances at St. O in the sediment were lower. In addition, total phytoplankton abundances in the water column and sediment were observed to be relatively higher in February and April 2007. Among the diatoms, Paralia sulcata was always dominant, accounting for 41$\sim$87% of total phytoplankton, except St. J for February 2007 during the sampling period. The following phytoplankton compositions observed in the digestive organs of oyster and clam appeared: diatoms such as genus Paralia, Navicula, Melosira and Coscinodiscus, Silicoflagellate Dictyocha, dinoflagellates Prorocentrum and Dinophysis. Phytoplankton compositions observed in the digestive organs of oyster and clam corresponded relatively well with the species composition appeared in the water column and sediments of each season. A significant relationship was found between individual weight of oyster or clam and their digestive organs weight, while there was not a close correlation with total phytoplankton amount. We suggest that P. sulcata always dominated as one of important the food source of oyster and clam in the marine ranching ground of Taeahn coastal waters.

본 연구는 2000년 12월에서 2007년 5월 사이 태안조간대에서 참굴(Crassostrea gigas)과 바지락 (Ruditapes phillippinarum)의 먹이원을 평가하기 위해서 굴과 바지락의 소화기관 내용물 속의 식물플랑크톤의 종 조성과 더블어 수증과 퇴적물의 식물플랑크톤의 군집조성을 격월로 조사했다. 조사기간 동안 수온은 7$^{\circ}C$에서 23$^{\circ}C$로, 염분은 34PSU에서 35PSU로, 각각 관찰되었다. 수중의 식물플랑크톤의 총 개체수는 옷점이 정산포 지점보다 높았고, 퇴적물 속의 총 개체수는 반대로 정산포가 옷점보다 높게 나타났다. 수중과 퇴적물의 식물플랑크톤의 총 개체수는 2월과 4월에 비교적 높게 관찰되었다. 규조류 중에서 Paralia sulcata는 항상 우점했고, 조사기간 중 정산포(St. J)의 2월을 제외하면 전체 식물플랑크톤의 41.3$\sim$87.9%로 압도적으로 우점했다. 굴과 바지락의 소화기관 내용물 속에 발견 된 종은 규조류 Paralia, Melosira, Coscinodiscus, Navicula속과 침편모조류 Dictyocha속, 와편모조류는 Prorocentrum, Dinophysis 속의 순으로 나타났다. 각 계절의 굴과 바지락의 소화기관에서 발견된 식물플랑크톤은 당 해역에서 수중과 퇴적물에서 출현하는 종 조성과 비교적 잘 일치했다. 굴과 바지락의 전중량과 소화기관의 무게와는 유의한 상관관계를 보였으나, 포식된 식물플랑크톤의 총량과는 직접적인 관계는 나타나지 않았다. 본 연구에서 P. sulcata는 태안 조간대에서 굴과 바지락의 중요한 먹이원의 하나로 항상 우점 출현하고 있다는 것을 제안했다.

Keywords

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