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Table 1 Environmental variables across the 62 sampling sites in the wet and dry seasons. **P < 0.01 or *P < 0.05 indicate the significant difference among seasons based on Mann-Whitney U tests

From: Environmental filtering and spatial processes equally contributed to macroinvertebrate metacommunity dynamics in the highly urbanized river networks in Shenzhen, South China

 

Wet season

Dry season

F

P

Min–Max

Mean

Min–Max

Mean

Water temperature (°C)

WT **

14.10–34.00

28.57 ± 3.58

14.30–26.8

21.50 ± 2.67

126.27

0.000

pH

pH **

6.76–8.76

7.30 ± 0.33

2.71–9.13

7.72 ± 0.77

8.01

0.005

Dissolved oxygen (mg/L)

DO

0.13–9.90

5.35 ± 2.25

1.54–9.41

5.84 ± 2.06

2.19

0.142

Conductivity (s/cm)

Cond

27.50–1628.00

349.99 ± 295.36

27.00–6250.00

545.22 ± 1010.27

1.48

0.226

Turbidity (NTU)

Tur **

1.14–271.00

38.03 ± 51.30

0.56–81.90

9.62 ± 12.54

37.48

0.000

River width (m)

RW **

3.00–220.00

40.15 ± 46.26

0.60–101.00

21.01 ± 19.81

9.14

0.003

Water depth (m)

WD

0.02–5.00

0.73 ± 1.06

0.05–3.50

0.47 ± 0.69

2.97

0.088

Velocity (m/S)

Vel

0.01–0.81

0.24 ± 0.18

0.01–0.90

0.25 ± 0.20

0.17

0.681

Div_substrate

Div_substrate

0.00–0.73

0.23 ± 0.26

0.00–0.73

0.22 ± 0.27

0.04

0.852

Percentage of boulder

%Boulder

0.00–100.00

9.68 ± 23.73

0.00–100.00

9.92 ± 24.97

0.00

0.952

Percentage of cobble

%Cobble

0.00–90.00

11.77 ± 25.16

0.00–90.00

10.08 ± 21.93

0.05

0.825

Percentage of pebble

%Pebble

0.00–85.00

8.87 ± 17.16

0.00–90.00

9.52 ± 17.94

0.01

0.935

Percentage of gravel

%Gravel

0.00–95.00

9.44 ± 18.36

0.00–95.00

8.26 ± 18.25

0.39

0.531

Percentage of sand and silt

%Sand and silt

0.00–100.00

59.92 ± 44.56

0.00–100.00

62.18 ± 43.82

0.12

0.736

Permanganate index (mg/L)

PI

0.90–12.30

3.04 ± 2.09

0.50–5.10

2.56 ± 1.14

1.85

0.176

Chemical oxygen demand (mg/L)

CODCr

6.00–69.80

13.81 ± 14.32

5.00–25.00

10.58 ± 4.99

0.65

0.422

Biochemical oxygen demand over 5 days (mg/L)

BOD5

0.50–27.30

2.79 ± 4.75

0.50–5.90

2.13 ± 1.26

0.03

0.859

Ammonium nitrogen (mg/L)

NH4+-N *

0.03–17.90

2.14 ± 3.93

0.03–4.10

0.79 ± 0.83

5.42

0.022

Total phosphorus (mg/L)

TP *

0.00–1.72

0.27 ± 0.41

0.01–0.39

0.15 ± 0.11

4.05

0.046

Total nitrogen (mg/L)

TN

0.13–18.32

4.99 ± 4.82

0.05–18.22

5.83 ± 5.04

0.87

0.353