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ISSN : 1225-3480
바지락의 섭식 특성을 분석하기 위해 서해의 곰소만에서 바지락의 소화관 내용물과 표층 해수의 식물플랑크톤 군집에 대해 정량 및 정성분석을 실시하였다. 바지락의 소화관에는 규조류 (71.5%), 와편모류 (13.1%), 미소플랑크톤 (6.6%) 과 중형동물플랑크톤을 포함한 유기쇄설물 등이 관찰되었다. 소화관내에서 섭식량은 겨울과 봄에 많았고 여름과 가을에 낮게 나타난 반면, 표층 해수의 식물플랑크톤 현존량은 가을에 가장 많았다. 또한 바지락의 크기가 클수록 섭식한 먹이생물의 양은 증가하였다. 소화관에서 관찰된 우점종은 저서성 규조류인 Paralia sulcata 및 Navicula arenaria와 와편모류의 cyst 이었던 반면 표층해수에서 우점종은 부유성 규조류인 Chaetoceros 속, Skeletonema 속, Asterionellopsis 속 등과 cryptomonads 및 P. sulcata이었다. 소화관 내용물 분석을 통해 바지락의 주요 먹이원은 저서성 규조류이며, 식물플랑크톤의 크기와 모양에 따라 선택적으로 섭식함을 확인하였다.
Feeding behaviour of the manila clam Ruditapes philippinarum was qualitatively and quantitatively characterized by comparing the contents composition in digestive tract of the clam and the phytoplankton community in surface sea water in Gomso Bay, west coast of Korea. The contents of digestive tract comprised diatoms (71.5%), dinoflagellates (13.1%), nannoplankton (6.6%), and detritus including mesozooplankton. The abundance of food organisms in digestive tract of the clam was high in winter and spring, while low in summer and autumn. But The biomass of phytoplankton in surface sea water revealed the highest value in autumn. Also, the larger the clam size increases the abundance of food organisms in digestive tract. The dominant species in digestive tract were Paralia sulcata and Navicula arenaria such as benthic diatoms and dinoflagellate cysts, whereas the dominant species in surface sea water were Chaetoceros, Skeletonema, Asterionellopsis such as pelagic diatoms, cryptomonads, and P. sulcata. Analyses of digestive tract revealed that benthic diatoms especially represent an important constituent of food organisms in the malina clam and different of phytoplankton size and morphology explain preference for food selectivity.
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