[Distribution Characteristics of Anaerobic Ammonia Oxidation Bacteria in Sediments from the Adjacent Seas of Yangtze Estuary].

Marine nitrogen cycle is of great significance to maintain the marine ecological balance. Anaerobic ammonia oxidation (ANAMMOX) process driven by anaerobic ammonia-oxidizing bacteria is an important way of promoting the marine nitrogen removal. In this study, quantitative PCR (qPCR), combining with environmental factors analysis, were used to study the distribution of ANAMMOX bacteria in the sediments from Yangtze River Estuary and its adjacent waters in summer, 2011. The results showed that the spatial abundance distribution of ANAMMOX bacteria was closely related to environmental factors. Total organic carbon, salinity, and concentration of ammonium played vital roles in regulating ANAMMOX bacteria abundances in this area. The abundance distribution of ANAMMOX bacteria was significantly positively correlated with total organic carbon content =0.69), reducing along with the increasing concentration of nitrite and DO, while the influence from salinity was complicated.