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. 2013 Dec 2;110(51):20669–20674. doi: 10.1073/pnas.1315456110

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Fig. 1. — Phylogenetically independent contrasts reveal a positive association between Hb-O₂ affinity and native elevation in Andean hummingbirds. (A) Phylogenetic relationships (25) and elevational distributions (ranges and midpoints) of 10 hummingbird species included in the analysis of Hb function. (B) Least-squares regression of phylogenetically independent contrasts revealed a significant negative relationship between P_50(KCl+IHP) and native elevation (i.e., a positive relationship between Hb-O₂ affinity and elevation). See Table S2 for full results.