Tianjin Key Laboratory of Marine Resources and Chemistry;
Tianjin University of Science and Technology;
Tianjin 300457;
China;
Research Centre for Indian Ocean Ecosystem;
Tianjin University of Science and Technology;
Tianjin 300457;
China;
Department of Microbiology;
Stroud Water Research Center;
Avondale;
PA 19311;
USA;
Laboratory of Marine Biology and Ecology;
Third Institute of Oceanography;
Ministry of Natural Resources;
Xiamen 361005;
China;
College of Marine Science and Technology;
China University of Geosciences(Wuhan);
Wuhan 430074;
China;
Bacterial community; Hypoxia; Stratification; The Bohai Sea; Nitrogen cycles; High-throughput sequencing;