Linear relationship between the measured rate of blood flow to the systemic circuit () and rate of blood flow through the left aorta () at 0, 12 and 24 h after feeding in 5-year-old control [21% O2 (N21)] snapping turtles. 0 h (white circles), 12 h (grey circles) and 24 h (black circles) after feeding. Linear relationship between the measured rate of blood flow to the systemic circuit() and rate of blood flow through the left aorta () at 0, 12 and 24 hafter feeding in 5-year-old control [21% O2 (N21)] snapping turtles. 0 h (white circles), 12 h (grey circles) and 24 h (black circles) after feeding. N=6. Dotted line fitted through origin with equation , R2=0.89022. Each circle represents a measurement from an individual turtle, with data from a total of six turtles contributing to this dataset. Oliver H. Wearing et al. J Exp Biol 2017;220:2589-2597 © 2017. Published by The Company of Biologists Ltd