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. 2018 Sep 18;8:13989. doi: 10.1038/s41598-018-32252-1

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Changing relationships between flight initiation distance (FID) and body mass (PC1) and slow–fast pace of life (PC2) gradients between stages of the annual cycle (breeding = open squares, continuous line; migration = filled dots, dashed line; winter = grey diamonds, dotted line). Lines are linear regression lines computed by means of phylogenetically corrected regressions accounting for phylogeny, sample size, starting distance and flock size effects. B (±SE) and P values are: PC1, breeding: −0.009 (±0.002), P < 0.001; PC1, migration: −0.001 (±0.002), P = 0.498; PC1, winter: −0.006 (±0.003), P = 0.056; PC2, breeding: −0.011 (±0.004), P = 0.008; PC2, migration: −0.008 (±0.005), P = 0.150; PC2, winter: 0.007 (±0.004), P = 0.097.