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Table 1 Population densities of ammonia-oxidizing microbes in biological soil crusts estimated by qPCR of amoA genes

From: Ammonia-oxidizing archaea and bacteria are structured by geography in biological soil crusts across North American arid lands

  ArchaealaamoA BacterialbamoA
Province Range Average (±SD) Range Average (±SD)
Sonoran 2.8 × 103–5.5 × 106 0.75 ± 1.6 × 106 3.9 × 103–3.7 × 105 0.47 ± 1.0 × 105
Chihuahuan 1.5 × 103–6.7 × 106 1.1 ± 2.0 × 106 8.7 × 104–5.0 × 105 2.5 ± 1.9 × 105
Colorado Plateau 2.0 × 103–5.8 × 106 0.59 ± 1.8 × 106 9.2 × 104–5.9 × 105 3.4 ± 1.6 × 105
Great Basin 5.4 × 101–4.8 × 104 1.7 ± 2.3 × 104 2.2 × 104–5.0 × 106 1.1 ± 2.0 × 106
All deserts 5.4 × 101–6.7 × 106 0.69 ± 1.6 × 106 3.9 × 103–5.0 × 106 3.4 ± 8.4 × 105
  1. aIn descending order n = 12, 10, 11, 6, 39. bIn descending order n = 12, 8, 12, 6, 38. All qPCR data are for amoA gene copies per gram of crusted soil.