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. 2018 Mar 14;8:4562. doi: 10.1038/s41598-018-22604-2

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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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AMR (filled triangles), RMR_sit filled circles) and AMR_inc (open diamonds) over development, calculated per bird. (a) Development of RMRsit, AMRinc and AMR. Regression line equations: Sit: y = 18.072x + 9.152; P < 0.001; AMR_inc: y = 7.428x + 11.864; P = 0.008; AMR: y = 32.330x + 20.319; P < 0.001). (b) Log-transformed data showing negatively allometric growth of AMR (y = 1.736x^0.660, P < 0.001), i.e. per unit mass, metabolic rate declines as body mass increases. AMR_inc (y = 1.295x^0.444, P = 0.002) and RMR_sit have negatively allometric growth (y = 1.449x^0.696, P < 0.001). (c) Proportion of AMR accounted for by AMRinc over development. There is an inverse relationship between AMRinc and increasing body mass (y = −0.065x + 0.444; P = 0.021).