Title Monthly distribution of ammonia-oxidizing microbes in a tropical bay
Author Tie-Qiang Mao2, Yan-Qun Li2, Hong-Po Dong1*, Wen-Na Yang2, and Li-Jun Hou1
Address 1State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, P. R. China, 2School of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, P. R. China
Bibliography Journal of Microbiology, 59(1),10–19, 2021,
DOI 10.1007/s12275-021-0287-5
Key Words ammonia-oxidizing microbes, monthly distribution, community structure, tropical bay
Abstract Ammonia oxidation, performed by ammonia-oxidizing archaea (AOA) and bacteria (AOB), plays a critical role in the cycle of nitrogen in the ocean. For now, environmental variables controlling distribution of ammonia-oxidizing microbes are still largely unknown in oceanic environments. In this study, we used real-time quantitative PCR and high-throughput sequencing methods to investigate the abundance and diversity of AOA and AOB from sediment and water in Zhanjiang Bay. Phylogenic analysis revealed that the majority of AOA amoA sequences in water and sediment were affiliated with the genus Nitrosopumilus, whereas the Nitrosotalea cluster was only detected with low abundance in water. Nitrosomonas and Nitrosospira dominated AOB amoA sequences in water and sediment, respectively. The amoA copy numbers of both AOA and AOB varied significantly with month for both sediment and water. When water and sediment temperature dropped to 17– 20°C in December and February, respectively, the copy number of AOB amoA genes increased markedly and was much higher than for AOA amoA genes. Also, AOA abundance in water peaked in December when water temperature was lowest (17–20°C). Stepwise multiple regression analyses revealed that temperature was the most key factor driving monthly changes of AOA or AOB abundance. It is inferred that low water temperature may inhibit growth of phytoplankton and other microbes and so reduce competition for a common substrate, ammonium.