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Fig. 3 | BMC Microbiology

Fig. 3

From: Core and conditionally rare taxa as indicators of agricultural drainage ditch and stream health and function

Fig. 3

Functional guilds in the core taxa (agri_core) and CRT (agri_CRT) of agricultural drainage ditch sites. (A) Spearman’s rank correlation coefficient between the abundance of agri_core ASVs (represented in genus names) and environmental factors. The significance levels are denoted by *, P ≤ 0.05; **, P ≤ 0.01; ***, P ≤ 0.001; ****, P ≤ 0.0001. These agri_core ASVs were significantly more abundant at agricultural drainage ditch sites than at other stream sites. (B) Seasonal changes in CRT associated with N fixation (256 ASVs), assimilatory nitrate reduction (1562 ASVs), dissimilatory nitrate reduction (1978 ASVs), nitrification (35 ASVs), and denitrification (1243 ASVs) at agricultural drainage ditch sites using the “loess” smooth method. These functional guilds were more abundant at agricultural ditch sites than at other sampling sites. Agri_ditches, include S18, S19, S20, and S21; Agri_253, site S253 is situated on a larger agricultural stream (Strahler stream order 4). The detailed descriptions of the water physicochemical properties can be found in Table 2

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