4.4.3.2. Anaerobic nitric oxide reduction
Families like Aeromonadaceae and Enterobacteriaceae were observed in the CAB of Pleuromamma spp. and Calanus spp. (in relatively higher proportion than other copepods). The genera Aeromonas(family Aeromonadaceae) [62] and Escherichia coli (family Enterobacteraceae) [63] are known to have norV genes. The presence of these bacterial taxa inPleuromamma spp. maybe due to feeding of ciliates, flagellates and detritus particles [11, 45]. This may be one of the reasons to have a high proportion of norV and norW genes in these copepods (Figure S4).