Evidence for mesothermy in dinosaurs

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Science  13 Jun 2014:
Vol. 344, Issue 6189, pp. 1268-1272
DOI: 10.1126/science.1253143

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  1. Fig. 1 The scaling of maximum growth rate in vertebrates.

    (A) Growth rates of thermoregularoty guilds. Red indicates endothermy; blue, ectothermy, gray, dinosaurs; and black, mesothermy. (B) Vertebrate taxa scaling with 95% confidence bands. The red dashed line indicates marsupials, and the black dashed line is tuna; all other taxa are labeled. See table S2 for regression parameters and statistics.

  2. Fig. 2 Vertebrate growth energetics.

    (A) Relationship between growth and resting metabolic rate for vertebrates. The dashed line is the theoretical prediction; the solid line represents an OLS fitted regression with 95% confidence bands. (B) Predicted energetics of dinosaurs. Dinosaur rates (open squares) from Eq. 2 are plotted on the theoretical line. The ranges in metabolic rates occupied by extant endotherms, mesotherms, and ectotherms are indicated by color.

  3. Fig. 3 Resting metabolic rates in vertebrates.

    (A) Predicted metabolic rates compared to observed rates. The solid line is the fitted regression, with shaded 95% confidence bands; the dashed line is the theoretical fit. (B) Metabolic scaling of vertebrates. Dinosaur resting metabolic rates are predicted from growth (dashed line); all other fits are predicted from empirical data. Endotherms: y = 0.019x0.75, r2 = 0.98, n = 89; Ectotherms (27°C): y = 0.00099x0.84, r2 = 0.95, n = 22; Dinosaurs: y = 0.0020x0.82, r2 = 0.96, n = 21. P < 0.001 for all regressions.

  4. Fig. 4 Phylogeny of mass-independent growth rates (g1/4 day–1).

    Color signifies thermoregulatory state; branch lengths are not standardized for divergence times. Green shading indicates feathered coelurosaurian dinosaurs.