Table 1.

Results of best-fit linear mixed models explaining the change in δ¹³C and δ¹⁵N values along the length of Antarctic fur seal whiskers: males, female Group 1 (females with lower mean δ¹³C values than estimated δ¹³C value of whiskers at the Polar Front) and female Group 2 (females with higher mean δ¹³C values than estimated δ¹³C value of whiskers at the Polar Front).

Fixed effects	Intercept Value	Degrees of freedom	p-value
δ13C
Male (Intercept)	−21.61	1596	<0.001
Female Group 1	1.66	37	<0.001
Female Group 2	3.56	37	<0.001
Age	−0.30	1596	<0.001
δ15N
Male (Intercept)	9.00	1596	<0.001
Female Group 1	−0.07	37	0.69
Female Group 2	1.93	37	<0.001
Age	0.15	1596	0.0038