소양호 원생생물과 동물플랑크톤간의 먹이망 동태

To clarify the role of protozoans in the microbial food web of Lake Soyang ecosystem, the clearance rate(CR) and carbon flux(C-flux) of zooplankton assemblage were investigated. Zooplankton were divided into two size groups(microzooplankton (MICZ): 60～200 μm, macrozooplankton (MACZ): >200μm). Conducted were both quantitative trophic linkage between protist and zooplankton community structure at two sites with different trophic status from April to December, 2006. In carbon flux from protist to zooplankton, and annual range of food contribution to microzooplankton were between 0.0003 in June and 0.0087 μgC․L—1․h—1 in September, whereas they contributed to macrozooplankton between 0.0423 in December and 1.0823 μgC․L—1․h—1 in September, respectively. In highlight of sampling time and station, carbon fluxes of protist to macrozooplankton was higher than microzooplankton in both two stations, the front of Dan and Yanggu bridge station. The magnitude of carbon flux between protist and zooplankton in the front of Dam station was relatively high in spring and summer, while that in Yanggu bridge was high in autumn and winter, respectively. Comparing the carbon flux between phytoplankton and protist to their same predator, micro- and macrozooplankton, four times(April, May, October and November) of total seven samplings carried out in the front of Dam station and four times(April, May, October and November) of total eight samplings were relatively high in protist. Therefore, these results indicated that protist was important prey of zooplankton(micro- and macrozooplankton) in Soyang lake.