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Mychonastes dominates the photosynthetic picoeukaryotes in Lake Poyang, a river-connected lake

文献类型： 外文期刊

作者： Shi, Xiaoli 1 ; Li, Shengnan 2 ; Fan, Fan 1 ; Zhang, Min 1 ; Yang, Zhen 1 ; Yang, Yunfeng 4 ;

作者机构： 1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, 73 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China

2.Hunan Acad Agr Sci, Hunan Inst Agroenvironm & Ecol, 892 Second Yuanda Rd, Changsha 410125, Hunan, Peoples R China

3.Univ Chinese Acad Sci, Coll Resources & Environm, 19 Yuquan Rd, Beijing 100049, Peoples R China

4.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, 30 Shuangqing Rd, Beijing 100084, Peoples R China

关键词： photosynthetic picoeukaryotes; Lake Poyang; community structure; MiSeq sequencing; river-connected lake

期刊名称：FEMS MICROBIOLOGY ECOLOGY （ 影响因子：4.194； 五年影响因子：5.137 ）

ISSN： 0168-6496

年卷期： 2019 年 95 卷 1 期

页码：

收录情况： SCI

摘要： Lake Poyang, which is connected to the Yangtze River, is the largest freshwater lake in China and experiences large and frequent changes in water levels. The seasonal diversity and composition of photosynthetic picoeukaryotes (PPEs) in Lake Poyang were investigated from flow-cytometry-sorted samples using MiSeq high-throughput sequencing. Flow cytometric counting indicated that PPEs accounted for 97% of the total picophytoplankton abundance in spring, reaching a maximum value of 6.30 x 10(4) cells mL(-1). PPEs in Lake Poyang showed lower diversity than those in other investigated lakes in the lower reaches of the Yangtze River and were dominated by one OTU (66.29%) affiliated with Mychonastes (Chlorophyceae). Other minor classes of PPEs were found to be sporadically abundant in specific seasons, i.e. Chrysophyceae prevailed in spring and summer, while Eustigmatophyceae was mainly present in winter. This study reports coccal green algae of Mychonastes in Lake Poyang; additionally, these algae are reportedly representative of the prominent plankton in this river-connected lake ecosystem but are often overlooked due to their lack of morphological features. Finally, the sequencing results from the sorted samples of Lake Poyang revealed that the proportion of PPEs was quite low, with an average of 36% of total reads. Many OTUs belonging to heterotrophic picoeukaryotes were also identified in the sorted samples, most of which were affiliated with terrestrial fungi, including Basidiomycota and Ascomycota. The spores of these fungi can disperse in the aquatic environment during the flood seasons, yet their effect on PPEs is still unclear.

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