Figure 1.

Average potential ammonia-oxidizing activities in mangrove soil slurries before and after prolonged incubation of 6 days with added ammonium in the absence (A) and presence (B) of continuously shaking of the slurries. Soils had been collected in 2009 and 2010 in two different impoundments (23 and 24) from three different habitats characterized by stunted (blue), sparse (red), and dense (green) Avicennia germinans. Both in 2009 and in 2010, incubation increased the potential activities significantly (p = 0.0039 and p = 0.0000, respectively; non-parametric Kruskal-Wallis test with N = 60 and H = 8.344 and H = 27.876, respectively). No significant effects between years, impoundments, and vegetation cover types were observed.