Thus, the presence of AOB corresponded
with the presence of oxygen and elevated AOP measured
in oxygenated sediment. In addition, the presence of N. oligotropha
correlated with observations of microbial diversity in similar environments
with moderate ammonia and organic carbon levels and
elevated DO. N. oligotropha were commonly the dominant AOB in
nitrifying activated sludge at moderate ammonia levels
(<100 mg N L1), while Nitrosomonas europaea and Nitrosomonas
mobilis dominated at high ammonia levels (Limpiyakorn et aleuropaea in nitrifying activated sludge (Park and Noguera, 2004). N.
oligotropha, sometimes in combination with Nitrosomonas urea,
were the dominant AOB in estuarine and marsh sediment (Bernhard
et al., 2005; Bollmann and Laanbroek, 2001). Nitrosospira sp.
were the dominant AOB in constructed treatment wetlands treating
relatively high ammonia, high BOD wastewaters (Ibekwe
et al., 2003; Gorra et al., 2007).
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