Gaseous emissions from dinosaurs may have warmed prehistoric earth

Dinosaurs may have emitted as much methane as animals and industry together do now
Schoolchildren at the "Walking with Dinosaurs" exhibition in London's O2 Arena in 2009. Giant dinosaurs that roamed the Earth millions of years ago may have warmed the planet with the gas they produced from eating leafy plants, British scientists say.

Sauropod dinosaurs could in principle have produced enough of the greenhouse gas methane to warm the climate many millions of years ago, at a time when the Earth was warm and wet. That's according to calculations reported in the May 8th issue of Current Biology, a Cell Press publication.

The hulking sauropods, distinctive for their enormous size and unusually long necks, were widespread about 150 million years ago. As in , methane-producing aided the sauropods' digestion by fermenting their .

"A simple suggests that the microbes living in may have produced enough methane to have an important effect on the Mesozoic climate," said Dave Wilkinson of Liverpool John Moores University. "Indeed, our calculations suggest that these dinosaurs could have produced more methane than all modern sources—both natural and man-made—put together."

Wilkinson and study coauthor Graeme Ruxton from the University of St Andrews were studying sauropod ecology when a question dawned on them: If modern cows produce enough methane gas to be of interest to climate scientists, what about sauropods? They teamed up with methane expert Euan Nisbet at the University of London to work out the numbers.

"Clearly, trying to estimate this for animals that are unlike anything living has to be a bit of an educated guess," Wilkinson said.

Animal physiologists have studied methane production from a range of modern animals to derive equations that predict methane production from animals of different sizes. It turns out that those calculations depend only on the total mass of the animals in question. A medium-sized sauropod weighed something like 20,000 kilograms, and sauropods lived in densities ranging from a few large adults to a few tens of individuals per square kilometer.

Wilkinson, Ruxton, and Nisbet therefore calculate global methane emissions from sauropods to have been 520 million tons (520 Tg) per year, comparable to total modern methane emissions. Before industry took off on modern about 150 years ago, methane emissions were roughly 200 Tg per year. By comparison, modern ruminant animals, including cows, goats, giraffes, and others, produce methane emission of 50 to 100 Tg per year.

The study's conclusions not only show "just how strange and wonderful the workings of the planet are" but also serve as a useful reminder for the importance of microbes and methane for global climate, the researchers say.


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More information: Wilkinson et al.: "Could methane produced by sauropod dinosaurs have helped drive Mesozoic climate warmth?." Current Biology, May 8, 2012.
Journal information: Current Biology

Provided by Cell Press
Citation: Gaseous emissions from dinosaurs may have warmed prehistoric earth (2012, May 7) retrieved 1 June 2020 from https://phys.org/news/2012-05-gaseous-emissions-dinosaurs-prehistoric-earth.html
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