Moving polewards in winter: a recent change in the migratory strategy of a pelagic seabird?

Table 2 Comparison of nitrogen stable isotope ratios of Thin-billed prions breeding in the Falkland Islands.

Source	Type III Sum of Squares	df	Mean Square	F	P	η ²
Dependent: δ¹⁵N
δ¹³C	577.4	1	577.4	300.7	<0.001	0.713
time	0.8	1	0.8	0.4	0.510	0.004
Error	232.3	121	1.9
Total	1078.6	123

Differences between historical and recent feathers were tested using GLM. Location (δ¹³C) was included in the model to account for differences in baseline levels with latitude (e.g. see Fig. 2B).

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