Jiang Xin, Li Jiajun, Ke Zhixin, Xiang Chenhui, Tan Yehui, Huang Liangmin
Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
Mar Pollut Bull. 2017 Apr 15;117(1-2):66-74. doi: 10.1016/j.marpolbul.2017.01.042. Epub 2017 Jan 27.
To understand the variations of picoplankton (Prochlorococcus, Synechococcus, picoeukaryotes, and heterotrophic bacteria) abundances during diatom bloom, the distribution of picoplankton in the Taiwan Bank, South China Sea was investigated using flow cytometry during a Thalassiosira diporocyclus bloom in March 2016. The results indicated an abrupt abundance decrease for Prochlorococcus, Synechococcus, and picoeukaryotes within the bloom area while the abundance of heterotrophic bacteria showed no significant difference between the bloom and non-bloom areas. We found two sub-groups of heterotrophic bacteria: high- and low-nucleic acid content (HNA and LNA) bacteria with HNA dominated in the bloom area whereas LNA dominated in the non-bloom area. Among the picoplankton components, HNA represented the highest (61.1%) carbon biomass in the bloom area while picoeukaryotes represented the highest (37.6%) in the non-bloom area. Our findings implied that heterotrophic bacteria, especially HNA, played an essential role during the diatom bloom.
为了解硅藻水华期间微微型浮游生物（原绿球藻、聚球藻、微微型真核生物和异养细菌）丰度的变化情况，于2016年3月在南海台湾浅滩的一次双孔圆筛藻水华期间，运用流式细胞仪对微微型浮游生物的分布进行了调查。结果表明，在水华区域内，原绿球藻、聚球藻和微微型真核生物的丰度急剧下降，而异养细菌的丰度在水华区域和非水华区域之间没有显著差异。我们发现异养细菌可分为两个亚群：高核酸含量（HNA）细菌和低核酸含量（LNA）细菌，在水华区域以HNA细菌为主，而在非水华区域以LNA细菌为主。在微微型浮游生物组分中，HNA在水华区域的碳生物量占比最高（61.1%），而微微型真核生物在非水华区域占比最高（37.6%）。我们的研究结果表明，异养细菌，尤其是HNA细菌，在硅藻水华期间发挥了重要作用。
