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. 2021 Mar 9;36(1):ME20143. doi: 10.1264/jsme2.ME20143

Table 1.

Detection and abundance of 16S rRNA genes of anammox bacteria and total bacteria in groundwater samples from shallow dug wells

Season Sample type Samples with the gene relative to all samples (detection %) Anammox bacterial 16S rRNA gene abundance (copies L–1) Total bacterial 16S rRNA gene abundance (copies L–1)
Min Max Avea Min Max Avea
Dry season Gravel subsurface 14/24 (58%) 1.7×105 7.6×106 1.4×106±1.9×106 6.3×106 1.7×1010 1.9×109±3.9×1010
Clay subsurface 23/44 (52%) 1.6×105 8.8×106 1.5×106±1.8×106 1.2×107 7.3×1010 3.3×109±1.1×1010
Wet season Gravel subsurface 20/29 (69%) 1.2×105 1.2×107 9.4×105±2.5×106 3.6×106 1.0×1011 5.0×109±1.9×1010
Clay subsurface 30/55 (55%) 4.3×104 3.1×106 5.3×105±7.3×105 3.3×106 3.0×1010 3.6×109±4.9×109 b
Total 87/152 (57%) 4.3×104 1.2×107 3.3×106 1.0×1011

a Values are means±SD.

b Significantly higher (Student’s t-test, P<0.05) than total bacterial 16S rRNA gene abundance in dry season (gravel subsurface and clay subsurface) samples and wet season (gravel subsurface) samples.