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《Oceanologia et Limnologia Sinica》 2016-01
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ZHANG Wu-Chang;CHEN Xue;LI Hai-Bo;WANG Chao-Feng;LIANG Chen;ZHANG Shan;XIAO Tian;Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences;Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology;University of Chinese Academy of Sciences;  
Marine planktonic ciliates are important components of microbial food web. They are the key link between microbial food web and classical food chain. Research on planktonic ciliates grazing is important to understand the role of planktonic ciliates on material cycling and energy flow in marine planktonic ecosystem. Food composition and ingestion intensity, including ingestion rate and clearance rate, food selectivity, the influencing factor of ingestion, assimilation and egestion after ingestion are the main research contents. Two methods were used to investigate food composition: the first one is to observe the food particles in ciliate food vacuoles, and the second one is to observe the growth of ciliates cultured in different foods. In laboratory, the batch culture feeding experiments and the method of detecting the increase of food particle inside the ciliates cells were used to measure ingestion rate and clearance of ciliates. Volume-specific clearance rate and specific ingestion rate were used to compare the ingestion rate and clearance rate of different ciliates. Ciliates can graze smaller ciliates, diatoms, dinoflagellates, nanoflagellates, Synechococcus, Prochlorococcus and bacteria. Ingestion rate of ciliates ranged from 0.1 to 920 cells/(ciliate h), and clearance rate ranged from 0 to 110 μL/(ciliate h). Ciliates show food selectivity according to food size and chemical quality. Food concentration, temperature, light and disturbance and the growth phase of ciliates itself can influence the ingestion rate of ciliates. The assimilation rate(67%—79%) and egestion time(13.7 min—24 h) were different when different ciliates and food were concerned.
【Fund】: 国家自然科学基金项目 U1406403号;; 中国科学院战略性先导科技专项 XDA11030202.2号;; 国家973计划 2014CB441504号
【CateGory Index】: Q958.8
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