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

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