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Table 5 Selected environmental variables from the sampling sites in the Gulf of Mexico

From: The metazoan parasite communities of the shoal flounder (Syacium gunteri) as bioindicators of chemical contamination in the southern Gulf of Mexico

 

All sampling sites

Group 1

Group 2

Group 3

Physicochemical variables

Mean ± SD

Range

Mean ± SD

Range

Mean ± SD

Range

Mean ± SD

Range

Alkalinity (meq.L-1)

2.64 ± 0.41

2.92-0.84

2.72 ± 0.13

2.55-2.92

2.60 ± 0.59

0.84-2.92

2.55 ± 0.50

1.44-2.92

Clay (%)

24.41 ± 15.10

0-55.00

24.53 ± 1.00

0- 55.00

28.00 ± 0.00

0- 55.00

18.49 ± 0.00

0-30.00

Silt (%)

15.00 ± 9.92

0-30.00

13.40 ± 8.87

2.00-30.00

17.73 ± 10.51

0- 30.00

14.14 ± 11.68

0.00-30.00

PCNM58K

−3.04 ± 21.20

−62.31-21.62

−8.36 ± 20.47

−39.63-21.62

−0.45 ± 25.65

−62.31-21.62

4.31 ± 13.33

−12.28-21.62

pH sediments

7.73 ± 0.21

7.45-8.33

7.61 ± 0.13

7.45-8.33

7.82 ± 0.26

7.59-8.33

7.84 ± 0.16

7.72-8.17

Porosity (%)

0.51 ± 0.08

0.26-0.64

0.53 ± 0.07

0.34-0.64

0.50 ± 0.10

0.26-0.60

0.49 ± 0.09

0.33-0.60

Sand (%)

60.59 ± 21.55

20.00-100

62.07 ± 19.34

20.00-97.00

54.27 ± 25.65

20.00-100

67.37 ± 19.40

47.00-100.00

Heavy metals

       

Aluminum (μg.g−1)

4.75 ± 4.14

0.24-18.52

2.83 ± 3.15

0.24-12.15

7.68 ± 5.00

1.00-18.52

4.25 ± 1.19

1.78-5.76

Cobalt (μg.g−1)

0.23 ± 0.07

0.05-0.49

0.24 ± 0.10

0.05-0.49

0.21 ± 0.07

0.05-0.31

0.24 ± 0.01

0.23-0.26

Vanadium (μg.g−1)

0.59 ± 0.87

0.02-4.01

1.17 ± 1.05

0.10-4.01

0.10 ± 0.05

0.02-0.20

0.13 ± 0.07

0.04-0.28

Zinc (μg.g−1)

0.88 ± 0.54

0-1.86

0.44 ± 0.34

0.00-1.14

1.09 ± 0.36

0.49-1.86

1.52 ± 0.20

1.11-1.78

Hydrocarbons

       

Aliphatics (μg.g−1)

0.30 ± 0.32

0-1.28

0.18 ± 0.00

0-0.45

0.45 ± 0.00

0-1.28

0.31 ± 0.00

0-0.74

Total PAH (μg.g−1)

1.31 ± 0.51

0.48-2.37

1.29 ± 0.52

0.48-2.37

1.38 ± 0.58

0.69-2.15

1.24 ± 0.44

0.79-2.09

UCM (μg.g−1)

11.65 ± 8.66

0.72-30.98

12.24 ± 8.41

1.45-26.79

13.96 ± 10.04

0.72-30.98

6.74 ± 5.27

0.91-16.23

Nutrients

       

Nitrates (μM)

1.90 ± 3.04

0.06-15.74

2.75 ± 4.28

0.20-15.74

1.25 ± 1.09

0.06-2.69

1.10 ± 1.06

0.20-2.69

Phosphorus (μM)

5.37 ± 1.22

1.85-6.50

5.27 ± 1.29

2.30-6.50

5.42 ± 1.32

1.85-6.38

5.53 ± 1.06

3.38-6.38

  1. The variables in bold are the ones that explained the highest percentage of variance in the redundancy analysis for both the overall analysis (33 sampling sites) and for each one of the groups of sampling sites in Figure 2. The PCNM58K corresponds to a spatial variable acting at the spatial scale of 58 km. Total PAH = total polycyclic aromatic hydrocarbons, UCM = unresolved complex mixture.
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