전자저널 > 전자저널 > Feeding Selectivity of the Jedo Venus Clam, Protothaca jedoensis on Phytoplankton

Feeding Selectivity of the Jedo Venus Clam, Protothaca jedoensis on Phytoplankton

Soo-Gun Jo, Ji-Hyun Kim, Yong-Ho Kim and Chang-Hoon Lee

Faculty of Marine Life Science, Kunsan National University, Gunsan 573-701

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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