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. 2015 Sep 15;10(9):e0138185. doi: 10.1371/journal.pone.0138185

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© 2015 Tourmente, Roldan

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 2 — Relationships between (A) Mass specific metabolic rate (ml O₂ h^-1 g^-1) and ATP amount per sperm (amol cell^-1), (B) mass specific metabolic rate and length-adjusted ATP concentration (amol μm^-1), (C) sperm straight-line velocity (μm s^-1) and ATP amount per sperm, and (D) sperm straight-line velocity and length-adjusted ATP concentration, in mammalian species. All variables are log₁₀-transformed. R ² and p-values were estimated using phylogenetically controlled regression analyses (PGLS).