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Table 2 Fatty acids of the river otter ( Lontra canadensis ) and several candidate prey species; Illinois, USA

From: Fatty acid analysis as a tool to infer the diet in Illinois river otters (Lontra canadensis)

FA Otter Crayfish Frog Mollusc Fisha
Tail Footpad Clup. Cypr. Perc. Silur.
10:0 0.0 ± 0.03b 0.0 ± 0.02 0.5 ± 0.42 0.2 ± 0.19 0.4 ± 1.47 0.1 ± 0.04 0.1 ± 0.08 0.1 ± 0.06 0.0 ± 0.05
12:0 0.2 ± 0.10 0.1 ± 0.07 0.1 ± 0.10 0.6 ± 0.51 0.0 ± 0.01 0.1 ± 0.02 0.2 ± 0.21 0.3 ± 0.26 0.5 ± 0.57
13:0 1.3 ± 2.09 2.3 ± 3.41 0.0 ± 0.00 3.1 ± 3.51 1.7 ± 3.61 0.3 ± 0.30 1.3 ± 1.73 1.0 ± 1.78 1.1 ± 2.25
14:0 3.8 ± 1.05 2.7 ± 0.99 1.5 ± 0.64 1.6 ± 0.47 1.3 ± 0.85 4.1 ± 0.81 2.5 ± 0.96 2.7 ± 0.64 2.5 ± 1.06
14:1 0.7 ± 0.45 1.9 ± 1.04 0.1 ± 0.14 0.2 ± 0.15 1.6 ± 1.95 0.2 ± 0.03 0.4 ± 0.25 0.4 ± 0.25 0.3 ± 0.18
15:0 0.6 ± 0.25 0.4 ± 0.24 0.4 ± 0.19 0.5 ± 0.55 1.3 ± 1.13 0.8 ± 0.24 0.6 ± 0.15 0.6 ± 0.23 0.6 ± 0.11
16:0 14.7 ± 3.33 11.3 ± 5.91 23.3 ± 8.09 17.7 ± 1.6 15.6 ± 4.08 17.0 ± 3.33 15.9 ± 1.98 17.7 ± 2.57 18.9 ± 1.73
16:1 13.7 ± 4.65 26.1 ± 9.01 5.7 ± 2.94 7.1 ± 3.38 13 ± 4.05 15.2 ± 7.16 10.2 ± 3.29 12.4 ± 3.23 8.9 ± 2.77
17:0 1.3 ± 0.47 0.4 ± 0.35 1.7 ± 0.89 0.5 ± 0.63 1.9 ± 0.44 1.9 ± 0.39 1.7 ± 0.46 1.9 ± 0.62 1.8 ± 0.51
17:1 1.6 ± 0.40 1.4 ± 0.51 1.0 ± 0.92 0.5 ± 0.65 1.0 ± 0.83 2.0 ± 0.47 1.2 ± 0.87 1.5 ± 0.73 0.9 ± 0.29
18:0 3.2 ± 1.60 1.4 ± 0.69 10.7 ± 5.57 7.7 ± 2.24 5.2 ± 1.20 3.0 ± 1.32 6.9 ± 2.59 4.8 ± 1.35 7.7 ± 1.76
18:1 29 ± 4.80 31.9 ± 8.71 23.3 ± 5.33 26.7 ± 3.38 9.8 ± 1.37 22.6 ± 5.28 19.8 ± 5.93 18.2 ± 2.96 20.1 ± 2.64
18:2 7.9 ± 3.30 8.7 ± 3.70 9.7 ± 4.12 14.6 ± 3.25 4.3 ± 0.99 3.3 ± 0.33 5.2 ± 2.63 5.4 ± 1.79 3.2 ± 1.74
18:3n6 0.3 ± 0.10 0.1 ± 0.12 0.2 ± 0.26 0.1 ± 0.17 0.3 ± 0.26 0.4 ± 0.06 0.4 ± 0.13 0.4 ± 0.11 0.2 ± 0.07
18:3n3 2.8 ± 0.89 2.4 ± 1.25 1.4 ± 1.37 5.4 ± 4.83 2.5 ± 0.72 3.9 ± 0.62 2.4 ± 1.29 3.4 ± 1.47 1.8 ± 0.76
20:0 0.1 ± 0.07 0.0 ± 0.03 0.3 ± 0.10 0.1 ± 0.13 0.3 ± 0.20 0.2 ± 0.06 0.2 ± 0.11 0.2 ± 0.09 0.3 ± 0.04
20:1 1.6 ± 0.73 0.4 ± 0.37 1.9 ± 1.54 0.2 ± 0.26 8.8 ± 2.98 0.8 ± 0.20 1.5 ± 0.70 1.0 ± 0.91 1.3 ± 0.77
20:2 0.8 ± 0.24 0.3 ± 0.27 0.9 ± 0.42 0.2 ± 0.19 1.2 ± 1.27 0.7 ± 0.21 0.7 ± 0.41 0.5 ± 0.44 0.5 ± 0.28
20:3n6 0.4 ± 0.10 0.2 ± 0.20 0.1 ± 0.12 0.3 ± 0.26 0.1 ± 0.10 0.3 ± 0.07 0.6 ± 0.42 0.3 ± 0.17 0.4 ± 0.11
20:4n6 2.0 ± 0.8 2.3 ± 1.22 2.9 ± 1.31 5.8 ± 2.33 5.8 ± 1.66 2.5 ± 0.92 4.7 ± 2.10 3.6 ± 1.22 5.0 ± 1.90
20:3n3 0.3 ± 0.09 0.1 ± 0.13 0.1 ± 0.16 0.1 ± 0.14 0.0 ± 0.05 0.1 ± 0.03 0.2 ± 0.11 0.3 ± 0.19 0.2 ± 0.07
20:5n3 1.4 ± 0.63 0.5 ± 0.37 8.4 ± 3.83 2.8 ± 0.83 5.8 ± 2.00 4.6 ± 0.86 7.8 ± 4.49 4.3 ± 2.72 6.1 ± 1.36
22:0 0.0 ± 0.02 0.0 ± 0.02 0.0 ± 0.03 0.0 ± 0.04 0.1 ± 0.54 0.0 ± 0.04 0.0 ± 0.00 0.1 ± 0.06 0.1 ± 0.06
22:1 0.1 ± 0.06 0.0 ± 0.01 0.0 ± 0.02 0.0 ± 0.01 0.2 ± 0.45 0.1 ± 0.05 0.0 ± 0.02 0.1 ± 0.06 0.0 ± 0.05
22:2 0.0 ± 0.01 0.0 ± 0.00 0.0 ± 0.00 0.0 ± 0.00 0.0 ± 0.05 0.0 ± 0.02 0.0 ± 0.00 0.0 ± 0.02 0.0 ± 0.02
22:4 0.7 ± 0.25 0.6 ± 0.51 0.0 ± 0.00 0.1 ± 0.15 1.3 ± 0.69 0.4 ± 0.23 0.4 ± 0.38 0.9 ± 0.65 1.0 ± 0.57
22:5 2.5 ± 0.88 1.1 ± 0.98 0.0 ± 0.13 0.6 ± 0.54 3.7 ± 2.09 1.3 ± 0.25 2.2 ± 1.59 3.3 ± 1.32 3.0 ± 0.57
24:0 0.0 ± 0.01 0.0 ± 0.00 0.0 ± 0.00 0.0 ± 0.00 0.0 ± 0.04 0.0 ± 0.02 0.0 ± 0.00 0.1 ± 0.09 0.1 ± 0.08
22:6n4 + 24:1c 3.0 ± 1.11 1.2 ± 1.06 1.9 ± 0.92 1.8 ± 1.27 1.8 ± 1.56 4.3 ± 0.77 6.2 ± 2.59 6.8 ± 2.72 6.4 ± 2.41
  1. aBecause a relatively large number of fish species were included in this study, they are subdivided here by order: Clupeiformes, Cypriniformes, Perciformes and Siluriformes (see Table 1).
  2. bAll values given as percentage of total fatty acids by mass ± 1sd.
  3. cThe column used in gas chromatography did not separate 22:6n4 and 24:1 and therefore they were grouped together.