Distribution of Aerobic Anoxygenic Phototrophs in Freshwater Plateau Lakes
Yingying Tian1, 2, Xingqiang Wu1, Qichao Zhou3, Oscar Omondi Donde1, 2, 4, Cuicui Tian1, Chunbo Wang1, Bing Feng1, 2, Bangding Xiao1
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1Key Laboratory of Algal Biology of Chinese Academy of Sciences, Institute of Hydrobiology,
University of Chinese Academy of Sciences, Wuhan 430072, China
2University of Chinese Academy of Sciences, Beijing 100101, China
3Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Institute
of Environmental Science (Kunming China International Research Center for Plateau Lake),
Kunming 650034, China
4Egerton University, Department of Environmental Science, P. O. Box 536-20115, Egerton-Kenya
Submission date: 2017-02-13
Final revision date: 2017-07-06
Acceptance date: 2017-07-23
Online publication date: 2018-01-15
Publication date: 2018-01-26
Pol. J. Environ. Stud. 2018;27(2):871–879
Aerobic anoxygenic phototrophic (AAP) bacteria are known functionally as photoheterotrophic microbes. Though numerously reported from ocean habitats, their distribution in freshwater lakes is far less documented. In the present study we investigated the dynamics of AAP bacteria in freshwater plateau lakes. Results revealed a high abundance of AAP bacteria in eutrophic lakes. Moreover, AAP bacteria were positively correlated with TN, TP, and Chl a, but the variations of AAP bacterial proportion to potential total bacteria (AAPB%). Alphaproteobacteria-related sequences dominated lakes Luguhu, Erhai, and Chenghai at ratios of 93.9, 85.4, and 70.6%, respectively, and in total comprised eight clearly defined subgroups. Sequences affiliated with Beta- and Grammaproteobacteria were found to be rare taxa. Additionally, Alkalibacterium-like sequences belonging to Firmutes were assigned. Overall, sequences from Alpha-, Beta-, Gammaproteobacteria, and Firmutes separately comprised of 81.6, 8.8, 0.8, and 4.0%. Our present work revealed extreme dynamics of AAP bacteria in both water columns and non-euphotic sediments of plateau aquatic ecosystems, which consolidated their wide distribution and enhanced adaptation.