| 摘要: |
| 利用荧光显微镜技术研究了东海(27°—32°N, 122°—130°E)中聚球蓝细菌(Synechococcus)的数量。结果表明, 冬季(1997年2—3月)聚球蓝细菌生物量是7.21—0.011 mgC/m3 (平均为0·82 mgC/m3), 夏季(1998年7月)聚球蓝细菌生物量是5.78—0.19 mgC/m3 (平均为1.43 mgC/m3)。夏季聚球蓝细菌的平均值是冬季的1.7倍。冬季受黑潮水的影响20m层和表层中的聚球蓝细菌数量自东南向西北递减。聚球蓝细菌生物量在总浮游植物生物量(CB/PB)中占的比例冬季平均是10% (0.5%—91.8%), 夏季平均是3%(0.6%—10.6%), 冬季是
夏季的3.3倍。微型浮游动物(nanozooplankton)是东海聚球蓝细菌的主要捕食者, 对聚球蓝细菌捕食率为0.218—0.759/d。
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| 关键词: 聚球蓝细菌生物量,生态分布,微食物环,东海 |
| DOI：10.11693/hyhz200301005005 |
| 分类号: |
| 基金项目:国家重点基础研究专项经费资助项目,G19990437号;国家自然科学基金重点资助项目,49636210号 |
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| DISTRIBUTION OF SYNECHOCOCCUSAND ITS ROLE IN THE MICROBIAL FOOD LOOP IN THE EAST CHINA SEA |
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XIAO Tian1,2, YUE Hai-Dong1,2, ZHANG Wu-Chang1,2, WANG Rong1,2
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1.Institute of Oceanology, The Chinese Academy of Sciences;2.Key Laboratory of Marine Ecology&Environmental Science, The Chinese Academy of Science
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| Abstract: |
| In the East China Sea was measured by epifluorescence microscopy in winter (Feb.—Mar., 1997) and summer (July, 1998). Cyanobacterial biomass (CB) varied from 7.21—0.011 mgC/m3 (mean = 0.82 mgC/m3) in the winter and 5.78—0.19 mgC/m3 (mean = 1.43 mgC/m3) in the summer. The average of CB was higher in summer than that in winter. CB decreased from southeast to northwest in the surface and 20 min winter. Kuroshio water was an important factor that affects the horizontal distribution of CB in winter. The ratio of cyanobacterial biomass to phytoplankton biomass (CB/PB) was 0.05—0.92 (mean = 0.10) in winter and 0.06—0.11 (mean = 0.03) in summer. The high value of CB/PB was inmesotrophic and oligotrophic waters (< 5μmol/L NO3). Experimental investigations showed that cyanobacterial population was grazed by nanozooplankton in the East China Sea. Grazing rates varied between 0.218—0.759/d in summer.
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| Key words: Synechococcus cyanobaterial biomass, Ecological distribution, The microbial food loop, The East China Sea |
