Will harmful dinoflagellate Karenia mikimotoi grow phagotrophically?  

作　　者：张清春 于仁成 宋静静 颜天 王云峰 周名江 

机构地区：[1]Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences [2]Graduate University of Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2011年第4期849-859,共11页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Nos. 40606029, 40821004);the National Basic Research Program of China (973 Program) (No. 2010CB428705);a project of the Chinese Academy of Sciences (No. KZCX2-YW-Q07-04)

摘　　要：We studied the phagotrophic ability of dinoflagellate strain Karenia mikimotoi KM-Lu （isolated from the South China Sea）, using fluorescent microspheres, bacteria isolated from the culture of K. mikimotoi and a marine microalgae lsochrysis galbana. We found that K. mikimotoi cultured under conditions of high light intensity could ingest fluorescent microspheres （diameters 0.5 and 2.0 lain） and fluorescence-labeled bacteria and microalgae. Under a low light intensity, however, only fluorescent microspheres （diameter 0.5 μm） and fluorescence-labeled microalgae were ingested. K. mikimotoi showed better growth by ingesting living marine bacteria or microalgae I. galbana than the controls, either in nutrient-depleted or nutrient-replete conditions. In nutrient-depleted conditions, the growth ofK. mikirnotoi was more significant with L galbana as the prey item. In conclusion, the harmful dinoflagellate K. mikimotoi from the South China Sea has apparent phagotrophic ability, and some marine bacteria and microalgae may promote the growth of K. mikimotoi.We studied the phagotrophic ability of dinoflagellate strain Karenia mikimotoi KM-Lü (isolated from the South China Sea), using fluorescent microspheres, bacteria isolated from the culture of K. mikimotoi and a marine microalgae Isochrysis galbana. We found that K. mikimotoi cultured under conditions of high light intensity could ingest fluorescent microspheres (diameters 0.5 and 2.0 μm) and fluorescence-labeled bacteria and microalgae. Under a low light intensity, however, only fluorescent microspheres (diameter 0.5 μm) and fluorescence-labeled microalgae were ingested. K. mikimotoi showed better growth by ingesting living marine bacteria or microalgae I. galbana than the controls, either in nutrient-depleted or nutrient-replete conditions. In nutrient-depleted conditions, the growth of K. mikimotoi was more significant with I. galbana as the prey item. In conclusion, the harmful dinoflagellate K. mikimotoi from the South China Sea has apparent phagotrophic ability, and some marine bacteria and microalgae may promote the growth of K. mikimotoi.

关 键 词：Karenia mikimotoi Isochrysis galbana marine bacteria fluorescent microspherephagotrophy 

分 类 号：X173[环境科学与工程—环境科学]