Holes In Baby Dinosaur Bones Show How Football-Sized Hatchlings Grew To 3-Tonne Teens
In new research, my colleagues and I determined how much energy minibus-sized dinosaurs called Maiasaura used while growing to adulthood.in the journal Paleobiology, show Maiasaura was capable of taking in huge amounts of energy and nutrients and using them for rapid growth and levels of activity comparable to those of modern mammals.Living an active lifestyle can leave traces in the skeleton.
However, little attention has been given to the bones of juvenile dinosaurs, in which primary bone is being laid down in a process called bone modelling. Maiasaura tended their eggs and raised offspring for more than a year after they hatched., reaching 200-400 kilograms by their second year, and over 3,000kg by their teens.
The shafts of long bones of the leg, such as the femur and tibia , are supplied with blood by the principal nutrient artery, which enters the bone through a hole that is visible on the surface.A decade ago, I wondered whether the size of the foramen could be an indirect measurement of the rate of blood flow to a bone.to estimate blood flow rate and hence how much energy and nutrients were used in the bones of adult dinosaurs.
Holly Woodward of Oklahoma State University had previously determined the ages of the animals when they died. Qiaohui Hu at Adelaide University used the best techniques for measuring foramen size and relating it to nutrient artery size.Our work produced clear results. Blood flow rates calculated from foramen size were similar in one-year-old dinosaurs weighing between 189kg and 455kg and in six- to 11-year-old adults weighing between 1,680kg and 3,200kg.
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