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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)