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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.
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Journal of Animal Science and Technology

ISSN: 2055-0391