ISSN : 1225-3480
한국 서해안에 서식하는 살조개의 먹이를 조사하기 위해 계절별 현장조사와 실험실 먹이 실험을 병행하였다. 소화관내 식물플랑크톤은 분류군별로는 규조류, 와편모조류, 황색편모조류, 녹조류 등이었으며, 개체 수로는 규조류가 96.0％로 가장 높았고, 그 외 와편모조류 1.46%, 황색편모조류 1.42%, 녹조류 0.05%, 기타 0.07%였다. 춘계에 해당하는 3월에 가장 다양한 종 수와 함께 많은 개체 수의 식물플랑크톤이 해수와 소화관에서 관찰되었다. 살조개의 소화관 내용물의 식물플랑크톤의 월별 출현 종과 출현 개체 수는 주변 해수에 분포하는 식물플랑크톤의 월별 종 수와 출현 개체 수에 비해 낮은 수치였으나 그 경향은 서로 유사하였다. 소화관에서 3월에 나타난 우점종은 Thalassiosira leptopus, Paralia sulcata, Coscinodiscus marginatus였으며, 6월과 9월에는 Coscinodiscus marginatus, Thalassiosira leptopus, Paralia sulcata, 12월에는 Thalassiosira leptopus, Coscinodiscus marginatus, Paralia sulcata가 양적으로 우점하여 나타났다. 해수 중의 우점종과 소화관 내의 우점종과는 일치하지 않았으나, Thalassiosira leptopus는 비교적 높은 선택성 지수를 나타냈고, Coscinodiscus marginatus와 Paralia sulcata는 주로 양의 선택성 지수를 나타내었다.
Based on both field and laboratory experiments, seasonal changes in the species composition and abundance of phytoplankton in the gut contents of the jedo venus clam, Protothaca jedoensis, and its feeding selectivity were investigated. The phytoplankton in the gut contents comprised Bacillariophyceae (diatom), Chlorophyceae, Chrysophyceae, and Dinophyceae, of which the diatoms being the most predominant throughout the year. Although the number of species and the abundance of phytoplankton in the sea water were always more diverse and more abundant than in the gut contents, the relative number and abundance were generally similar in the seawater and in the gut contents. In the laboratory experiments, the relative abundances of Coscinodiscus marginatus and Thalassirosira eccentrica were much more higher in the gut contents than any other algal species, while Paralia sulcata, Skeletonema costatum, and Eucampia zodiacus were abundant in order of cell density in the ambient water. These results suggest that P. jedoensis may feed preferably on single algal cell or smaller chains of algal cells.
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