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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.