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How Cold-Blooded Were the Dinosaurs?

The body temperature of enormous sauropods like Brachiosaurus and Apatosaurus that ruled the Jurassic period was similar to those of most birds -- and even akin to mammals like us, claims a new article published in Science magazine.

This peek into long-gone temperature comes from a most unusual place: teeth.

“We just did this with a collection of fossil teeth,” Dr. Robert Eagle, one of the two main research scientists for the project, told FoxNews.com. "We used a novel chemical technique which measured temperature by the way in which a mineral forms. The study we just published was the first time we had really taken this technique to test these fossil teeth from a dinosaur where we had no idea what its physiology was.”

The technique hinges on one of life’s most fundamental building blocks: the atom.

Many elements on the periodic table typically have what are called isotopes -- variants of elements in which the number of protons remains the same while the number of neutrons in the nucleus differ. The number of neutrons in an atom affects its overall molecular weight, which in turn affects its chemical properties.

Dr. Eagle, who conducted this research with Dr. John Eiler in Eiler's lab at Caltech University, simply studied differences among these isotypes that greatly depend on temperature.

“When we took the measurements, we got body temperatures around 36 to 38 degrees Celsius, which is similar to temperatures of most modern day mammals,” Dr. Eagle told FoxNews.com. “It’s certainly hotter than most modern cold blooded organisms, which range from 26 to 30 degrees Celsius. It gives us a new angle on this long standing problem on dinosaur physiology.”

Since the Jurassic period is considered to have been a blistering one, these temperature ranges suggest that sauropods had unique method to help cool themselves down. These could vary from genetic adaptations like an internal air sac or behavioral adaptations such as seeking shade during the middle of the day.

Though these findings can estimate temperature, they don’t provide a definite answer to the dispute of whether or not dinosaurs were hot or cold blooded. But it does provide something that doesn’t normally happen in regards to dinosaur physiology -- scientific consensus.

“It’s really a debate that’s been around for a long time,” Dr. Eagle told FoxNews.com. “When dinosaurs were first named as a group, people assumed they were slow lumbering reptiles. It wasn’t really until the 60s and 70s that people began to say they were more active creatures. Since then, I wouldn’t say there was a consistent opinion on dinosaur physiology. So our technique is unique in that sense.”

And with more chemical analysis, scientists could potentially solve even more fundamental mysteries, such as what exactly happened to Earth’s prehistoric inhabitants.

“One of the most exciting things that you could address with this technique is not just picking a dinosaur and saying its body temperature,” Dr. Eagle told FoxNews.com. You could also look at evolutionary adaptations between dinosaurs and birds, he noted, to "really try and figure out at what stage did warm bloodedness arise."

Read more: http://www.foxnews.com/scitech/2011/06/23/how-cold-blooded-were-dinosaurs/#ixzz1QAki11NL


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Caltech researchers get dinosaur body temperatures for first time

Researchers at Caltech say they have taken the first direct temperature measurement of dinosaurs - and a possible step toward disrupting prevailing knowledge in one of paleontology's biggest debates.

For the last three decades or so, most scientists have accepted the hypothesis that dinosaurs were warm blooded - closer in body temperature and metabolic function to modern-day mammals and birds than reptiles.

In a study of isotopic concentrations in dinosaur teeth published today in "Science," Caltech professor John Eiler and his team report temperature readings similar to those of modern mammals and birds - but also suggest a more complicated view of the theory that dinosaurs had a warm-blooded metabolism.

"There are good reasons for the current point of view... but it might be that truth is something quite different," Eiler said.

In a technique he likens to "sticking a thermometer in a creature that's been extinct for 150 million years," Eiler and his team analyzed several teeth from sauropods - believed to be the biggest terrestrial animals to ever inhabit the earth - from sites in the U.S. and Africa.

What they found were high temperatures - but not as high as projected.

"We've provided a number that sounds warm, but you have to consider their tremendous size," Eiler said.


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