Figure 1.

Mean vessel diameter by family and environment. A) Family mean arterial diameter in mm for larvae reared in normoxic and hypoxic environments. Solid lines and symbols represent means for dorsal aorta. Intermittent lines and open symbols represent means for caudal arteries. B) Venous diameter in mm for larvae reared in each environment. Solid line and symbols represent means for dorsal vein. Intermittent lines and open symbols represent veins. Error bars represent one standard error. Significant variation exists between families for venous diameter, while significant variation between environments in arterial diameter.