Cite this paper:
Limei SHI, Yuanfeng CAI, Xiaoli SHI, Min ZHANG, Qingfei ZENG, Fanxiang KONG, Ping XU. Community structure of aerobic anoxygenic phototrophic bacteria in algae- and macrophyte-dominated areas in Taihu Lake, China[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1855-1867

Community structure of aerobic anoxygenic phototrophic bacteria in algae- and macrophyte-dominated areas in Taihu Lake, China

Limei SHI1, Yuanfeng CAI2, Xiaoli SHI1, Min ZHANG1, Qingfei ZENG1, Fanxiang KONG1, Ping XU3
1 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
3 The Philips Institute of Oral and Craniofacial Molecular Biology, Virginia Commonwealth University, Richmond, VA 23298- 0566, United States of America
Aerobic anoxygenic phototrophic bacteria (AAPB) represent a major group of bacterioplankton assemblages in many water systems and some are assumed to be closely associated with phytoplankton. However, studies on relationships between AAPB and cyanobacterial blooms are in scarcity. The dynamics of the abundance and diversity of AAPB was compared based on pufM gene in Meiliang Bay (featured by cyanobacterial blooms) and East Bay (featured by macrophyte) of Taihu Lake, a shallow subtropical lake in the East China plain. AAPB abundance was not significantly different between the two sites, and they were positively correlated with dissolved organic carbon (DOC) concentration. The ratios of AAPB to total bacteria varied from 3.4% to 11.5% and peaked in winter in both sites. No significant differences of AAPB community compositions were detected between the two sites, but there was a separation between warm seasons (June, August, and October) and cold seasons (December, February, and April). Rhizobiales and Limnohabitans-like pufM sequences were significantly contributors for the difference between two seasons, and specially enriched in cold seasons. Chlorophyll a (Chl a) and DOC were the most significant variables influencing the AAPB community structure. Furthermore, Porphyrobacter and Rhodospirillales -like pufM sequences were positively correlated with Chl a, indicating potential influence of cyanobacterial blooms on these AAPB taxa. These results suggested that diverse AAPB ecotypes coexisted in Taihu Lake, and their ecological role in carbon cycling in the lake may not be ignored.
Key words:    aerobic anoxygenic phototrophic bacteria    cyanobacterial blooms    dissolved organic carbon    Alphaproteobacteria     chlorophyll a   
Received: 2021-10-22   Revised: 2022-02-08
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