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. 2016 Jun 29;13:30. doi: 10.1186/s12983-016-0162-0

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Interspecific covariation between morphological traits and altitude of the 14 species examined. Correlations of altitude with tarsus and culmen length and PC1 of beak shape are shown. Dots with different colours and shapes represent different species. Lines represent phylogenetic generalized least square (PGLS) regressions