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Table 3 Comparison of environmental and physicochemical characteristics between sites with and without B. straminea

From: Spatial distribution and habitat suitability of Biomphalaria straminea, intermediate host of Schistosoma mansoni, in Guangdong, China

  Presence of B. straminea P-value
No (n = 78) Yes (n = 6)
Landscape and climatic variables
 Altitude (m) 10.0 (4.0,33.2) 45.0 (43.5,53.2) 0.019
 NDVI 0.7 (0.6,0.8) 0.7 (0.6,0.7) 0.951
 MAP (mm) 1714 (1685,1818) 1969 (1937,2016) 0.004
 MAT (°C) 22.2 (22.0,22.3) 22.2 (22.0,22.5) 0.807
 MaxTWM (°C) 33.3 (32.9,33.8) 32.4 (31.8,32.5) < 0.001
 MinTCM (°C) 10.5 (9.8,11.4) 11.9 (11.7,12.1) 0.009
 MTWQ (°C) 28.5 (28.2,28.6) 28.0 (27.8,28.3) 0.012
 MTCQ (°C) 14.7 (14.1,15.2) 15.2 (15.1,15.5) 0.053
Water variables
 pH 6.71 (6.48, 7.05) 6.92 (6.52, 6.96) 0.889
 TN (mg/L) 2.31 (1.27, 7.80) 8.33 (5.79, 12.9) 0.030
 NOx (mg/L) 0.78 (0.29, 1.72) 3.10 (1.08, 4.53) 0.050
 NH3−N (mg/L) 0.33 (0.10, 1.04) 2.28 (1.23, 5.90) 0.025
 TP (mg/L) 0.13 (0.07, 0.20) 0.52 (0.17, 0.87) 0.071
 COD (mg/L) 9.97 (4.48, 22.1) 14.1 (9.32, 19.1) 0.487
 DO (mg/L) 5.64 (4.80, 6.51) 3.97 (3.62, 4.46) 0.039
 EC (mS/m) 144 (69.4, 229) 92.0 (68.0, 113) 0.234
 Ca (mg/L) 4.31 (1.01, 18.5) 29.2 (19.6, 104) 0.006
 Mg (mg/L) 1.11 (0.76, 1.57) 0.02 (0.01, 0.53) 0.002
 Zn (mg/L) 0.01 (0.00, 0.04) 0.08 (0.05, 0.19) 0.005
 Mn (mg/L) 0.13 (0.05, 0.26) 0.32 (0.25, 0.61) 0.010
Sediment variables
 pH_s 6.98 (6.31, 7.31) 6.85 (6.66, 7.15) 1.000
 EC_s (mS/m) 391 (211, 814) 962 (557, 1649) 0.124
 TOC (g/kg) 27.4 (20.4, 37.8) 28.5 (20.3, 43.3) 0.907
 Cu_s (mg/kg) 0.67 (0.13, 2.96) 2.84 (1.51, 22.5) 0.046
 Zn_s (mg/kg) 5.76 (0.20, 22.4) 37.7 (22.3, 48.4) 0.005
 Mn_s (mg/kg) 71.3 (0.57, 132) 199 (81.0, 212) 0.020
 Cd_s (mg/kg) 0.13 (0.00, 0.19) 0.07 (0.04, 0.18) 0.820
 Pb_s (mg/kg) 1.92 (0.04, 8.10) 2.76 (1.00, 4.81) 0.922
 Ni_s (mg/kg) 1.25 (1.25, 1.25) 2.22 (1.25, 10.4) 0.099
  1. Environmental and physicochemical variables are shown as median (25th and 75th percentile)